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Targeted Degradation of CTCF Decouples Local Insulation of Chromosome Domains from Genomic Compartmentalization
Open accessPublished version of a preprint
Abstract
Summary The molecular mechanisms underlying folding of mammalian chromosomes remain poorly understood. The transcription factor CTCF is a candidate regulator of chromosomal structure. Using the auxin-inducible degron system in mouse embryonic stem cells, we show that CTCF is absolutely and dose-dependently required for looping between CTCF target sites and insulation of topologically associating domains (TADs). Restoring CTCF reinstates proper architecture on altered chromosomes, indicating a powerful instructive function for CTCF in chromatin folding. CTCF remains essential for TAD organization in non-dividing cells. Surprisingly, active and inactive genome compartments remain properly segregated upon CTCF depletion, revealing that compartmentalization of mammalian chromosomes emerges independently of proper insulation of TADs. Further, our data support that CTCF mediates transcriptional insulator function through enhancer-blocking but not as a direct barrier to heterochromatin spreading. Beyond defining the functions of CTCF in chromosome folding these results provide new fundamental insights into the rules governing mammalian genome organization.
Overview
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Written from the paper’s full text.
TL;DR
Acute auxin-inducible degradation of CTCF in mouse embryonic stem cells shows that CTCF is required for CTCF-site looping and TAD insulation but not for A/B compartmentalization. The paper separates local TAD insulation from higher-order genome compartmentalization and supports CTCF as an enhancer blocker rather than a direct H3K27me3 barrier.
Key findings
- CTCF depletion abolished CTCF-anchored loops and caused loss of insulation at >80% of TAD boundaries; 1000 persistent CTCF-less boundaries (18% of initial boundaries) remained, and restoring CTCF re-established architecture.
- A/B compartments remained properly segregated after CTCF depletion, with only a minor reproducible ~10% reduction in compartmentalization strength; contact-frequency scaling with genomic distance did not change.
- Insulation defects were dose-dependent: cells with around 15% residual CTCF preserved more insulation than completely depleted cells, helping explain milder RNAi phenotypes that leave 10–15% CTCF.
- RNA-seq showed 370 differentially expressed genes at day 1 and 4996 at day 4; >80% of early down-regulated genes had CTCF bound within 1 kb of the TSS, while up-regulated genes were closer to active enhancers and more often separated from them by a TAD boundary. CTCF depletion did not trigger H3K27me3 spreading.
Methods
- Endogenous CTCF was tagged at both Ctcf alleles with an auxin-inducible degron (AID) in E14Tg2a mouse embryonic stem cells, with Tir1 expression and 500 µM auxin/IAA for acute, reversible depletion; cells were also differentiated into neural precursor cells and resting astrocytes.
- Chromosome conformation was assayed by 5C at the Xic and by Hi-C at 20 kb/100 kb resolution, alongside ChIP-seq, ChIP-exo, RNA-seq time courses, 3D DNA FISH, Western blotting, flow cytometry, and proliferation assays.
- Analyses included insulation-score boundary calling, A/B compartment eigenvector analysis, differential expression, CTCF motif orientation, and integration with CTCF/Cohesin loop anchors and enhancer annotations.
Limitations
- The paper states that comparing Hi-C and FISH is limited because Hi-C read numbers are normalized between samples while FISH distances are absolute; it also notes that RNA-seq does not directly measure ongoing transcription rates and that limited Hi-C resolution prevents robust identification of small TADs.
- The paper states that Tir1 transgene variegation upon differentiation limited analyses in committed cells, that CTCF-AID NPC subclones did not survive freeze-thawing, and that insulation did not reform after auxin washout in resting astrocytes.
- The text makes evident that most experiments rely on mESCs and selected loci/cell types, that the AID fusion caused basal CTCF levels about 2–3-fold lower than parental cells, and that prolonged depletion produces secondary effects, so the study focuses on acute depletion during at least two days.
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A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Surprisingly, active and inactive genome compartments remain properly segregated upon CTCF depletion, revealing that compartmentalization of mammalian chromosomes emerges independently of proper insulation of TADs.”
- Also stated in: § Disruption of Local Insulation Does Not Affect Higher-Order Chromosome Folding · hedged
“Contact maps (Figure 4A) as well as compartment signal (Imakaev et al., 2012) indicated that compartmentalization and genomic location of the transitions between A-and B- compartments are maintained after CTCF depletion (Figure 4B-C and S4A).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Abstract
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Also stated in: § Disruption of Local Insulation Does Not Affect Higher-Order Chromosome Folding · hedged
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In the paper
“The fact that in our data CTCF does not bind the majority (80%) of TSS of genes up-regulated after 1 day suggests CTCF normally represses them indirectly.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
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In the paper
“We detected a minor but reproducible reduction (∼10%) in the strength of compartmentalization upon CTCF depletion (Figure S4B).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Disruption of Local Insulation Does Not Affect Higher-Order Chromosome Folding
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Taking advantage of the Smc1a HiChIP data we noticed that promoters of mis-regulated genes are more often close to loop anchors than promoters of non-regulated genes (Figure S6D), while the distribution is similar outside of the anchors.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
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In the paper
“Strikingly, the orientation of the CTCF motif at these TSSs is almost systematically in direct orientation with the direction of transcription (90% of unequivocal sites, Figure 6C and Supplementary Table 7).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
Strength:boosted· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIn the paper
“consistent with previous boundary-deletion experiments (Ji et al., 2016), TAD boundaries separate further apart in the three-dimensional space of the nucleus (Figure S3L).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Depletion Triggers Dramatic Loss of TAD Insulation
What the sources say
- Not checked yetcites Ji et al., 2016
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Intra-TAD FISH distances were unaffected by CTCF depletion, indicating that loss of CTCF does not trigger general chromatin compaction.”
- Also stated in: § CTCF Binding Is Not a Direct Impediment to H3K27me3 Spreading in mESCs · plain
“Overall chromosome compaction and organization are however not affected.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Depletion Triggers Dramatic Loss of TAD Insulation
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Also stated in: § CTCF Binding Is Not a Direct Impediment to H3K27me3 Spreading in mESCs · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The enrichment level in persistent peaks was severely reduced (Figure S2D-E), indicating that CTCF occupancy is lost or considerably lower at all of its binding sites after depletion.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Auxin Treatment Severely Depletes CTCF from Chromatin
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In the paper
“From these 1000 CTCF-less residual boundaries 609 (61%) had at least one CTCF ChIP-seq peak +/- 1 bin (20kb) prior to depletion, suggesting that CTCF binding at these sites is not what initially drove local insulation.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Disruption of Local Insulation Does Not Affect Higher-Order Chromosome Folding
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIn the paper
“As reported previously the AID fusion led to slight constitutive destabilization (Morawska and Ulrich, 2013), so that basal CTCF levels were about 2–3-fold less in the AID-eGFP fusion line compared to the untagged parental line (Figure 1B and C).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Acute CTCF Depletion with the Auxin-Inducible Degron System
What the sources say
- Not checked yetcites Morawska and Ulrich, 2013
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Acute CTCF depletion was tolerated for 2 days without obvious cell death or differentiation (Figure 1F)”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Acute CTCF Depletion with the Auxin-Inducible Degron System
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Using ChIP-seq in CTCF-AID cells after 2 days of auxin we detected only 27% of the initial CTCF peaks.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Auxin Treatment Severely Depletes CTCF from Chromatin
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In the paper
“Changes were restricted to a very local gain of H3K27me3 signal at the initially bound CTCF site (Figure 7B and S7A), possibly due to nucleosomes becoming able to occupy the formerly bound CTCF site (Wiechens et al., 2016).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Binding Is Not a Direct Impediment to H3K27me3 Spreading in mESCs
Strength:hedged· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The absolute number of differentially expressed genes increased over ten-fold between day 1 (370) and day 4 (4996) (Figure S6A-B)”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We find that immediately up-regulated genes tend to be located genomically closer to active enhancers (Figure 6D and S6B) than down- or non-regulated genes.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
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In the paper
“However, a higher fraction of up-regulated genes normally have a TAD boundary separating them from neighboring (<200kb) enhancers, compared to down-regulated or non-regulated genes (Figure 6E and S6C).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
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In the paper
“Integration with CTCF Chip-exo data revealed that over 80% of the early down-regulated genes had CTCF bound within 1kb of the transcription start site (TSS) prior to depletion, as opposed to less than 20% of the up-regulated genes (Figure 6B).”
- Also stated in: § CTCF and transcriptional regulation · hedged
“This indicates that the activity of a subset of CTCF-bound promoters (10% of all CTCF bound TSS) critically relies on CTCF, likely via direct binding.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Also stated in: § CTCF and transcriptional regulation · hedged
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“CTCF remains essential for TAD organization in non-dividing cells.”
- Also stated in: § Loss of CTCF also Triggers Misfolding in Non-Cycling Cells · plain
“5C at the Xic revealed disrupted folding in cycling NPCs as well as resting ACs, whether CTCF was depleted before (Figure 5B-G) or after (Figure S5A-J) cell-cycle exit.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Abstract
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Also stated in: § Loss of CTCF also Triggers Misfolding in Non-Cycling Cells · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“CTCF depletion did not trigger spreading of H3K27me3 as measured by ChIP-seq (Figure 7B-C), even after 4 days (3-4 cell divisions Figure S1B).”
- Also stated in: § CTCF Does Not Directly Constrain the Spread of H3K27me3 but May Still Define Chromatin Domains · plain
“Our observation that H3K27me3 patterns remain largely unaltered challenges the notion that CTCF binding acts as a direct roadblock to heterochromatin spreading.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Binding Is Not a Direct Impediment to H3K27me3 Spreading in mESCs
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Also stated in: § CTCF Does Not Directly Constrain the Spread of H3K27me3 but May Still Define Chromatin Domains · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Scaling of contact frequencies as a function of genomic separation did not change either (Figure 4D).”
- Also stated in: § Introduction · boosted
“CTCF depletion did not either alter how contact frequency scales overall with genomic distance, demonstrating that CTCF-mediated chromosomal interactions are not the ties that enable packaging of mammalian chromosomes.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Disruption of Local Insulation Does Not Affect Higher-Order Chromosome Folding
Load-bearingStrength:boosted· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Also stated in: § Introduction · boosted
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Transcriptional activity (neighboring PolII ChIP-seq peak detected in untreated cells) was detected at 416 of the residual CTCF-less boundaries (41% - 2 fold enrichment over chance overlap).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Disruption of Local Insulation Does Not Affect Higher-Order Chromosome Folding
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“ChIP-seq patterns from cells where auxin was washed off 2 days after a 2-day treatment was virtually identical to untreated cells, revealing that CTCF readily regains access to all of its cognate binding sites after transient depletion in mESCs (Figure S2B-E).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Auxin Treatment Severely Depletes CTCF from Chromatin
Strength:boosted· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“but depleting for longer slowed cell proliferation dramatically (Figure 1F and S1A-B).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Acute CTCF Depletion with the Auxin-Inducible Degron System
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Second, out of the 1000 CTCF-less residual boundaries only 103 (10% - 3.1 fold enrichment over chance overlap, Figure S3E-F) were associated with a transition between A- and B- compartments.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Disruption of Local Insulation Does Not Affect Higher-Order Chromosome Folding
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However immediate up-regulation is not coordinated for all genes of the domain for all TADs.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Our Hi-C maps revealed extensive ectopic contacts across initial TAD boundaries, clearly visible by 5C as early as 24h after CTCF depletion (about two cell divisions; Figure 3A and S3A-B).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Depletion Triggers Dramatic Loss of TAD Insulation
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In the paper
“Insulation defects scaled with the degree of CTCF depletion and samples with around 15% CTCF preserved more insulation than completely depleted cells (with some boundaries more sensitive than others, Figure 5I-J).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF depletion Needs to Be Near-Complete to Exhibit the Most Substantial Defects on TAD insulation
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In the paper
“For the two loci surveyed, loss of CTCF reduced inter-TAD 3D distances, which became equivalent to intra-TAD distances.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Depletion Triggers Dramatic Loss of TAD Insulation
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIn the paper
“As reported in human cells (Cuddapah et al., 2009), we found that a subset of CTCF sites mark transitions in H3K27me3 enrichment in mESCs (∼7% of CTCF sites, Figure 7A).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Binding Is Not a Direct Impediment to H3K27me3 Spreading in mESCs
What the sources say
- Not checked yetcites Cuddapah et al., 2009 source
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Finally, depletion efficiency was equally efficient irrespective of local binding site density (Figure S2F-H).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Auxin Treatment Severely Depletes CTCF from Chromatin
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In the absence of CTCF, linear genomic coordinates become a better predictor of 3D distances (Figure S3K)”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Depletion Triggers Dramatic Loss of TAD Insulation
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIn the paper
“CTCF is absolutely and dose-dependently required for looping between CTCF target sites and insulation of topologically associating domains (TADs).”
- Also stated in: § CTCF is required for accumulating chromatin loops at CTCF sites · boosted
“This confirmed that CTCF is required for the interaction between CTCF/Cohesin bound loop-anchor loci genome-wide, and that bringing CTCF back is sufficient to restore these preferential contacts (Figure 2C).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Abstract
What the sources say
- Not checked yetcites Mumbach et al., 2016 source
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Also stated in: § CTCF is required for accumulating chromatin loops at CTCF sites · boosted
In the paper
“In line with earlier less impactful (Figure S3M) RNAi-mediated CTCF depletion (Zuin et al., 2014) we detected fewer intra-TAD contacts upon loss of CTCF by Hi-C, while FISH did not detect changes in intra-TAD compaction (Figure 3C-F).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Depletion Triggers Dramatic Loss of TAD Insulation
What the sources say
- Not checked yetcites Zuin et al., 2014 source
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This indicates that up-regulated genes tend to localize in the same TAD more often than by chance (p=0.0042, and p=0.19 for down-regulated genes -Methods).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIn the paper
“Promoters of affected genes were not specifically enriched for tandem CTCF sites compared to their occurrence in CTCF ChIP-seq peaks genome-wide (around 1/3 of peaks have multiple CTCF motifs (Pugacheva et al., 2015)).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Quantification and Statistical Analysis > CTCF Motif orientation analysis
What the sources say
- Not checked yetcites Pugacheva et al., 2015 source
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIn the paper
“This comparison revealed that at high threshold values, corresponding to stricter boundary selection, up to 62% of detected boundaries co-aligned with the previously detected loop anchors within +-1 20kb bin precision.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Quantification and Statistical Analysis > Hi-C analysis
What the sources say
- Not checked yetcites Mumbach et al., 2016 source
Strength:hedged· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“As we lowered the boundary detection threshold, fewer added boundaries co-aligned with the loops”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Quantification and Statistical Analysis > Hi-C analysis
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesA conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“In the absence of CTCF neighboring TADs merge, with consequences on transcriptional regulation.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Binding Is Not a Direct Impediment to H3K27me3 Spreading in mESCs
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesNone of the sources cited for this claim have been checked yet.
In the paper
“Our observations are consistent with the proposed mechanisms of TAD formation by intra-TAD loop extrusion and are in agreement with the idea that CTCF is a major blocking factor to the processivity of extrusion (Fudenberg et al., 2016; Sanborn et al., 2015).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Discussion > Local Insulation and A/B Compartmentalization Are Molecularly Separable Principles of Mammalian Genome Folding
What the sources say
Strength:hedged· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIn the paper
“This substantiates the notion that these two aspects are molecularly coupled (Giorgetti et al., 2014).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Discussion > CTCF Is Necessary for TAD Insulation and Loops between Boundaries
What the sources say
- Not checked yetcites Giorgetti et al., 2014 source
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“This suggests that CTCF depletion triggers up-regulation of a subset of genes formerly insulated from neighboring enhancers by a TAD boundary.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Factors other than CTCF must therefore control the basal packaging regime of chromatin as well as its segregation in A- and B-compartments.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Disruption of Local Insulation Does Not Affect Higher-Order Chromosome Folding
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesNone of the sources cited for this claim have been checked yet.
In the paper
“This observation supports at the genome-wide level the notion that CTCF can mediate enhancer-blocking insulation through the specification of TAD boundaries, in line with previous locus-specific studies (Dowen et al., 2014; Doyle et al., 2014; Lupiáñez et al., 2015; Nora et al., 2012).”
- Also stated in: § CTCF Does Not Directly Constrain the Spread of H3K27me3 but May Still Define Chromatin Domains · plain
“Altogether current data support that CTCF mediates enhancer-blocker activity, through its ability to mediate insulation and segmental folding into TADs, but is not a direct impediment to heterochromatin spreading.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
What the sources say
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Also stated in: § CTCF Does Not Directly Constrain the Spread of H3K27me3 but May Still Define Chromatin Domains · plain
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“revealing that compartmentalization of mammalian chromosomes emerges independently of proper insulation of TADs.”
- Also stated in: § Local Insulation and A/B Compartmentalization Are Molecularly Separable Principles of Mammalian Genome Folding · plain
“We conclude that proper packaging of chromatin into TADs is not a prerequisite for the segregation of A and B compartments.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Abstract
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Also stated in: § Local Insulation and A/B Compartmentalization Are Molecularly Separable Principles of Mammalian Genome Folding · plain
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We demonstrate that CTCF is a major determinant of mammalian chromosome folding.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Introduction
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesA conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“However, while some transcripts showed a trend downward their initial values while others kept rising (Supplementary Table 3), suggesting that for a small subset of genes transient loss of CTCF depletion can trigger transcriptional changes that become irreversible, indicating they are involved in a positive feedback mechanism.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
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In the paper
“This indicates that promoters at loop anchors and TAD borders are more sensitive to CTCF disruption than genes away from boundaries.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
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In the paper
“Therefore down-regulation cannot be explained by loss of direct looping between promoters and enhancers.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
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In the paper
“Our data support at the genome-wide level that CTCF binding confers the insulated nature of mammalian TADs, corroborating earlier boundary deletion experiments.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Discussion > Pervasive Loss of Insulation upon CTCF Depletion Ascertains the Central Importance of Boundary elements
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In the paper
“our observations also reveal an important activator effect of CTCF through direct promoter binding”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Introduction
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In the paper
“Its role is however restricted to sub-megabase genome organization”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Introduction
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In the paper
“demonstrating that CTCF-mediated chromosomal interactions are not the ties that enable packaging of mammalian chromosomes.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Introduction
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In the paper
“CTCF depletion did not disrupt A/B compartments, revealing that local insulation and higher-order compartmentalization rely on distinct molecular determinants.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Introduction
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In the paper
“TADs and compartments therefore do not represent a hierarchy in the folding of mammalian chromosomes.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Discussion
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In the paper
“Robust expression of the Tir1 transgene was absolutely critical to mediate auxin responsiveness.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Gene targeting
Strength:boosted· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIn the paper
“suggesting that Tigre allows for higher expression or the Tir1 transgene, as reported previously (Madisen et al., 2015).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Gene targeting
What the sources say
- Not checked yetcites Madisen et al., 2015 source
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
- It may state two separate claims as one. 24
- Probably not a substantial claim. 23
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“After removing those that displayed residual CTCF binding by ChIP-seq we identified 1000 persistent CTCF-less boundaries (18% of initial boundaries), where insulation was much less affected by CTCF depletion (Figure 3B).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Depletion Triggers Dramatic Loss of TAD Insulation
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In the paper
“Integration with CTCF Chip-exo data revealed that over 80% of the early down-regulated genes had CTCF bound within 1kb of the transcription start site (TSS) prior to depletion, as opposed to less than 20% of the up-regulated genes (Figure 6B).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Washing off auxin led to reformation of insulated TADs in mESCs and NPCs but not resting astrocytes.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Loss of CTCF also Triggers Misfolding in Non-Cycling Cells
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In the paper
“Auxin washoff after a 2-day treatment did not completely restore the transcriptome, with most (252 out of 278, 90%) of the differentially expressed genes remaining up-regulated compared to untreated cells (Figure 6A-B).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
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In the paper
“with around half of the dysregulated being down-regulated and half up-regulated at each time-point.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“CTCF depletion was maximal as early as 3h45 after adding auxin (Figure 1E).”
- Also stated in: § Acute CTCF Depletion with the Auxin-Inducible Degron System · plain
“Recovery initiated readily after washoff and was half complete by 15h (Figure 1E).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Acute CTCF Depletion with the Auxin-Inducible Degron System
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
- Also stated in: § Acute CTCF Depletion with the Auxin-Inducible Degron System · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Restoring CTCF reinstates proper architecture on altered chromosomes, indicating a powerful instructive function for CTCF in chromatin folding.”
- Also stated in: § CTCF is required for accumulating chromatin loops at CTCF sites · plain
“In contrast, auxin-mediated depletion of CTCF led to complete disappearance of these 5C peaks while auxin washoff restored them (Figure S2I).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Abstract
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
- Also stated in: § CTCF is required for accumulating chromatin loops at CTCF sites · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Importantly, CTCF depletion in mESCs did not block cells in a specific phase of the cell cycle, and did not induce DNA damage or aneuploidy (Supplementary figures 1D-E).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Acute CTCF Depletion with the Auxin-Inducible Degron System
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In the paper
“Folding defects appeared somewhat less pronounced in differentiated cells, correlating with switching of a large portion of the region surveyed into a lamina associated domain (LAD) – and presumably B compartment (Figure 5A-D).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Loss of CTCF also Triggers Misfolding in Non-Cycling Cells
Strength:hedged· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
In the paper
“In contrast, auxin-mediated degradation of CTCF prevented subcloning of CTCF-AID cells, recapitulating the full CTCF knockout phenotype in mESCs (Sleutels et al., 2012) (Figure 1D).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Acute CTCF Depletion with the Auxin-Inducible Degron System
What the sources say
- Not checked yetcites Sleutels et al., 2012 source
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“Loss of CTCF led to loss of insulation at most boundaries (>80%, Figure 3B).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Depletion Triggers Dramatic Loss of TAD Insulation
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
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In the paper
“We noticed that at the promoter of the immediately down-regulated genes CTCF is bound slightly upstream of the TSS (around 60bp) and demarcates the beginning of the nucleosome-depleted region (Figure 6C).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF and transcriptional regulation
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In the paper
“On a more global scale, we observed a slight but significant decrease in overall H3K27me3 levels (Figure S7B).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Binding Is Not a Direct Impediment to H3K27me3 Spreading in mESCs
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
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In the paper
“Auxin in itself was neutral to untagged mESCs (Figure 1D and E), with no differential gene activity detected after up to 4 days of treatment (Supplementary tables 2 and 3).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Acute CTCF Depletion with the Auxin-Inducible Degron System
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In the paper
“Basal CTCF-AID-eGFP levels were slightly lower (1.5-2 fold) than when Tir1 was inserted at Rosa26 or randomly (Figure S3C)”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Gene targeting
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“We observed equivalent CTCF depletion efficiency with the AID* as with the original full-length 231 amino-acid tag (Nishimura et al., 2009) (data not shown).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Plasmid Construction
What the sources say
- Not checked yetcites Nishimura et al., 2009 source
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The Tir1 transgene variegated upon differentiation, which we overcame by first converting CTCF-AID mESCs into self-renewing Neural Precursor Cells (NPCs), subcloning NPCs and then selecting clonal lines that retained homogenous CTCF degradation upon auxin treatment.”
- Also stated in: § Gene targeting · plain
“Indeed our CTCF-AID lines down-regulated Tir1 during differentiation, even when targeted at Rosa26, leading to variegation of auxin response and limiting our analyses in committed cells that can be subcloned, such as neural progenitors.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Experimental Model and Subject Details > Neural progenitor cells and astrocytes
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
- Also stated in: § Gene targeting · plain
A result the paper reports from its own data — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“We noticed that only a handful of resistant clones were recovered, suggesting sub-optimal targeting – either because of the sgRNA or the targeting construct.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Gene targeting
Strength:hedged· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
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In the paper
“We noticed that Tir1 targeting with the Tigre targeting vector was at least 5-fold more efficient than with our Rosa26 targeting vector.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Gene targeting
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In the paper
“These changes enable proceeding through the 3C protocol in a single tube per sample, allow handling of over 20 samples in parallel, reduce the amount of cells needed by a factor 5 to 10 and cut down the time needed to complete the protocol from 8 days (Nora et al. 2012) to 4 days.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Chromosome Conformation Capture Carbon-Copy (5C)
What the sources say
- Not checked yetcites Nora et al. 2012 source
Strength:plain· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
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In the paper
“We noticed the dual nickase underperformed for Rosa26 and recommend using a single nuclease strategy approach with the first sgRNA only.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Plasmid Construction
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“The emerging model is that Cohesin packages the chromatin fiber while CTCF defines focal boundaries by constrains this packaging activity.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Discussion > TAD Insulation and Transcriptional Regulation
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
A conclusion the paper draws from its own results — it cites no other source for it, so there is none to check. The quote shows it is in the paper.
In the paper
“While this is compatible with compartment transition or transcription participating in the maintenance of CTCF-independent insulation, either of these features alone is not sufficient to drive CTCF-independent insulation since most boundaries associated with them are affected by CTCF depletion (Supplementary Table 6).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > Disruption of Local Insulation Does Not Affect Higher-Order Chromosome Folding
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In the paper
“Notably, the extrusion model accurately describes mammalian chromosome folding at the sub-megabase scale but does not account for the segregation of genomic compartments, and the direct molecular drivers of CTCF-independent higher-order compartmentalization remain to be defined.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Discussion > Local Insulation and A/B Compartmentalization Are Molecularly Separable Principles of Mammalian Genome Folding
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In the paper
“This would explain why depleting CTCF does not affect how the frequency of chromosomal contacts scales overall with genomic distance, as opposed to altering factors that control Cohesin turnover on chromatin, such as Nipbl (Schwarzer et al., 2016).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Discussion > TAD Insulation and Transcriptional Regulation
What the sources say
- Not checked yetcites Schwarzer et al., 2016
Load-bearingStrength:hedged· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
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In the paper
“These changes are likely indirect effects as they are not restricted to the vicinity of CTCF sites, and may be accounted for by 2-fold transcriptional down-regulation of the essential PRC2 component EED (Supplementary Table 3).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Results > CTCF Binding Is Not a Direct Impediment to H3K27me3 Spreading in mESCs
Strength:hedged· not yet calibratedCausal:conditional· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIt may state two separate claims as one.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“The relative efficiency of Hi-C ligation product formation and biotin fill-in was defined as the proportion of ligation product digested with NheI and varied from 50 to 80% in different Hi-C libraries.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Hi-C
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
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In the paper
“this analysis suggested the optimal threshold of 0.3, where the specificity of loop anchor recall dropped 3-fold.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Quantification and Statistical Analysis > Hi-C analysis
Strength:hedged· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
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In the paper
“It indicated that the majority of the ligation products have been digested by NheI and validated that the libraries were mainly constituted of true ligation products.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Hi-C
Strength:hedged· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
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In the paper
“Over 95% of cells had one knock-in allele, of which 20% were homozygous.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Gene targeting
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Rosa26 PCR genotyping revealed this clone had undergone random insertion of the Tir1 cassette.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Gene targeting
Strength:plain· not yet calibratedSingle caseTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
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In the paper
“The clone analyzed here was homozygous for the integration and the puro cassette was still present in the final cell line.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Plasmid Construction
Strength:plain· not yet calibratedSingle caseTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Dissociation, wahs and Flow buffers were supplemented with auxin, when appropriate, to avoid re-expression of the CTCF-AID-eGFP fusion.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Flow Cytometry
Strength:hedged· not yet calibratedCausal:direct· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“Negative controls (no ligase, no template, no 5C oligonucleotide) were included during each experiments to ensure the absence of contamination.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Chromosome Conformation Capture Carbon-Copy (5C)
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
In the paper
“For peak calling we followed the guidelines described in (Thomas et al., 2016).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Quantification and Statistical Analysis > ChIP-seq Analysis
What the sources say
- Not checked yetcites Thomas et al., 2016 source
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“The CTCF-AID NPC subclones did not survive freeze and thawing.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Experimental Model and Subject Details > Neural progenitor cells and astrocytes
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
None of the sources cited for this claim have been checked yet.
In the paper
“We used the smallest functional truncation of the AID tag (AID*, 44 amino-acids), initially developed in yeast (Morawska and Ulrich, 2013), shorter than the mini-AID (67 amino-acids (Kubota et al., 2013)).”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Plasmid Construction
What the sources say
- Not checked yetcites Morawska and Ulrich, 2013
- Not checked yetcites Kubota et al., 2013 source
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
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In the paper
“Half of the clones were found to have undergone FlpO-mediated recombination. When homozygous both alleles always underwent recombination.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Gene targeting
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it. It may state two separate claims as one.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“The consensus peak list was obtained by retaining peaks that overlapped for at least 1bp between biological replicates.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Quantification and Statistical Analysis > ChIP-seq Analysis
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“FPKM provided in Supplementary Table 3 are means from 3 independent biological replicates.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Quantification and Statistical Analysis > RNA-seq Analysis
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✗ Load-bearing: fails✓ Based: passesProbably not a substantial claim. The paper’s conclusions may not depend on it.
What the paper did — it cites no source for this, so there is none to check. The quote shows it is in the paper.
In the paper
“We selected the clone with the fewest GFP-positive cells (<1%) after 24h of auxin treatment.”
§ Targeted degradation of CTCF decouples local insulation of chromosome domains from genomic compartmentalization > Method Details > Gene targeting
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
The source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
In the citing paper
“Depleting RAD21 or CCCTC-binding factor (CTCF) also down-regulated Car2 (fig. S12C) (7, 30)”
From Synergy between regulatory elements can render cohesin dispensable for distal enhancer function (2026) · cites this paper as [30]
Experimental — accuracy not yet measuredThe source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
In the citing paper
“Finally, the temporary disruption of 3D loops on a genome-wide scale through cohesin depletion was found to have minimal lasting effect on gene expression155,156.”
From Towards a comprehensive catalogue of validated and target-linked human enhancers (2020) · cites this paper as [156]
Experimental — accuracy not yet measuredThe source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
In the citing paper
“Surprisingly however, deletion or degradation of cohesin or CTCF in differentiated cells has only mild effects on gene expression [344–349].”
From Transcriptional enhancers and their communication with gene promoters (2021) · cites this paper as [346]
Experimental — accuracy not yet measuredThe source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
In the citing paper
“The A/B compartment structure does not disappear (and is in fact even strengthened) upon cohesin/CTCF depletion [344, 346–348], but, like TADs, dissolves in mitosis [459].”
From Transcriptional enhancers and their communication with gene promoters (2021) · cites this paper as [346]
Experimental — accuracy not yet measuredThe source backs part of the claim, not all of it — or backs it for a different population, condition or comparison.
In the citing paper
“rapid depletion of cohesin or CTCF quickly abolishes TADs but, as mentioned above, has only relatively mild effects on gene expression [301, 345–347, 448].”
From Transcriptional enhancers and their communication with gene promoters (2021) · cites this paper as [346]
Experimental — accuracy not yet measured
The cited source says what the claim attributes to it.
In the citing paper
“Convergent binding sites for the versatile transcription factor CTCF (CCCTC-binding factor) located at TAD borders [46] block the movement of loop extruders [47,48,49].”
From Enhancer Function in the 3D Genome (2023) · cites this paper as [47]
In the citing paper
“Our data is consistent with a previous report that genome compartmentalization is preserved after depletion of cohesin (Seitan et al., 2013) or CTCF (Nora et al., 2017).”
From Cohesin Loss Eliminates All Loop Domains (2017) · cites this paper as Nora et al., 2017
In the citing paper
“Our data for cohesin depletion is consistent with is study.”
From Cohesin Loss Eliminates All Loop Domains (2017) · cites this paper as Nora et al., 2017
In the citing paper
“loop extrusion mediated by cohesin and CTCF mediates the formation of chromatin loops and self-interacting Topologically Associating Domains (TADs)”
From Neuronal DNA double-strand breaks lead to genome structural variations and 3D genome disruption in neurodegeneration (2023) · cites this paper as [86]
In the citing paper
“recent evidence indicates that domains and compartment formation can be at least partially uncoupled and may result from different biological phenomena (Nora et al., 2017).”
From Multiscale 3D Genome Rewiring during Mouse Neural Development (2017) · cites this paper as Nora et al., 2017
In the citing paper
“It is known that architectural proteins such as CTCF and cohesin play a role (Haarhuis et al., 2017, Nora et al., 2017, Phillips-Cremins et al., 2013)”
From Multiscale 3D Genome Rewiring during Mouse Neural Development (2017) · cites this paper as Nora et al., 2017
In the citing paper
“complementary polymer simulation studies and Hi-C studies employing acute depletion of CTCF and cohesin, which also support such a dynamic model.”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
In the citing paper
“Finally, ∼18% of TAD boundaries appear to be partially resistant to CTCF loss,10 suggesting that additional boundary factors, such as active promoters4 since engaged RNA Pol II can block cohesin extrusion46 as well as alternative architectural factors, may also play a role.”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
In the citing paper
“Likewise, CTCF loss has only a small effect on epigenomic compartments,10 whereas cohesin loss increases the degree of epigenomic compartmentalization ∼2-fold.11,13”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
In the citing paper
“In conclusion, recent studies10–15 employing induced CTCF and cohesin degradation now strongly support a model where cohesin forms TADs and CTCF establishes TAD boundaries.”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
In the citing paper
“Consistent with their different roles, CTCF loss has essentially no effect on genome-averaged contact probability at any distance scale,10 whereas cohesin loss significantly reduces contact probability at the scale of tens to hundreds of kilobases,11”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
In the citing paper
“In accordance with the extrusion model, TADs and well-defined Hi-C loops largely disappear when either CTCF10,14 or cohesin11,13–15 is strongly depleted, but for different reasons.”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
In the citing paper
“In summary, CTCF and cohesin are required for chromatin looping,10–15 form a biochemically stable protein-complex and both bind chromatin at loop anchors.”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
In the citing paper
“Thus, chromatin is still compacted and extruded by cohesin, but without sharp boundaries, TADs disappear in Hi-C maps.10,14”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
In the citing paper
“Since multiple studies show that TADs and chromatin loops disappear without CTCF10,14 and cohesin,11,13–15 we reasoned that the most stable protein of CTCF and cohesin should set an upper limit on the stability of TADs and chromatin loops.”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
In the citing paper
“although CTCF and cohesin both appear absolutely required for the formation of most TADs10-15”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
In the citing paper
“Notably, a key advantage of dynamic loop extrusion models is that they can explain recent perturbation experiments where CTCF binding sites have been added or deleted9,49-51 and also explain the loss of either CTCF or cohesin.10-15”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
In the citing paper
“(∼18% of TAD boundaries were not sensitive to CTCF loss10 and could have different dynamics)”
From Recent evidence that TADs and chromatin loops are dynamic structures (2018) · cites this paper as [10]
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
Each contradiction between two passages listed here was confirmed by an independent check.
RecJf digestion step specifies lambda exonuclease
MinorThe step is described as RecJf exonuclease digestion and uses RecJf buffer, but the enzyme specified for that step is lambda exonuclease.
“RecJf exonuclease digestion was performed by resuspending the beads in 100μL 1× RecJf exonuclease buffer”
“supplemented with 30U lambda exonuclease (NEB) and incubating at 37°C for 30min.”
CTCF tag placement differs between Results and Methods
MinorThe Results say the AID-eGFP tag was introduced at the Ctcf stop codon, but the gene-targeting Methods say it was knocked in at the N-terminus of CTCF.
“we targeted the stop codon of both Ctcf alleles to introduce a 44–amino acid version of the AID tag”
“To knock in the AID-eGFP cassette at the N-terinus of CTCF E14Tg2a passage 19 were transfected by microporation”
Different Tir1 targeting vectors specified for cell line #1
MinorThe plasmid-construction Methods identify pEN113 as the Tir1 vector for cell line #1, whereas the gene-targeting Methods say pEN114 was used to introduce Tir1 into the line subsequently identified as #1.
“The Tir1 expression vector (pEN113) for the cell line analyzed by Hi-C (#1) was assembled”
“To knock in the Tir1-expressing cassette one homozygous CTCF-AID-eGFP clone was transfected as described above using a 100μL tip format and pEN114 as the targeting construct.”
Citations
Cites
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Multiplex Genome Engineering Using CRISPR/Cas Systems
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A 3D Map of the Human Genome at Kilobase Resolution Reveals Principles of Chromatin Looping
Rao, S. S. P., Huntley, M. H., Durand, N. C., Stamenova, E. K., Bochkov, I. D., Robinson, J. T., Sanborn, A. L., Machol, I., Omer, A. D., Lander, E. S., et al. (2014) · Cell · doi:10.1016/j.cell.2014.11.021 · Cited by 9,212
Comprehensive Mapping of Long-Range Interactions Reveals Folding Principles of the Human Genome
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FIMO: scanning for occurrences of a given motif
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Flagged first, then by citations
Cited by
Sorted by citations
Cohesin Loss Eliminates All Loop Domains
Rao, S. S. P., Huang, S.-C., Glenn St Hilaire, B., Engreitz, J. M., Perez, E. M., Kieffer-Kwon, K.-R., Sanborn, A. L., Johnstone, S. E., Bascom, G. D., Bochkov, I. D., et al. (2017) · Cell · doi:10.1016/j.cell.2017.09.026 · Cited by 1,883
“Our data is consistent with a previous report that genome compartmentalization is preserved after depletion of cohesin (Seitan et al., 2013) or CTCF (Nora et al., 2017).”
BackgroundResultMultiscale 3D Genome Rewiring during Mouse Neural Development
Bonev, B., Mendelson Cohen, N., Szabo, Q., Fritsch, L., Papadopoulos, G. L., Lubling, Y., Xu, X., Lv, X., Hugnot, J.-P., Tanay, A., et al. (2017) · Cell · doi:10.1016/j.cell.2017.09.043 · Cited by 1,338
Organizational principles of 3D genome architecture
Rowley, M. J., & Corces, V. G. (2018) · Nature Reviews Genetics · doi:10.1038/s41576-018-0060-8 · Cited by 1,171
Two independent modes of chromatin organization revealed by cohesin removal
Schwarzer, W., Abdennur, N., Goloborodko, A., Pekowska, A., Fudenberg, G., Loe-Mie, Y., Fonseca, N. A., Huber, W., Haering, C. H., Mirny, L., et al. (2017) · Nature · doi:10.1038/nature24281 · Cited by 1,196
Self-citationLong-range enhancer–promoter contacts in gene expression control
Schoenfelder, S., & Fraser, P. (2019) · Nature Reviews Genetics · doi:10.1038/s41576-019-0128-0 · Cited by 1,102
Metadata
- Authors
- Nora, E. P., Goloborodko, A., Valton, A.-L., Gibcus, J. H., Uebersohn, A., Abdennur, N., Dekker, J., Mirny, L. A., & Bruneau, B. G.
- Affiliations
- Gladstone Institutes (US)
- Massachusetts Institute of Technology (US)
- Howard Hughes Medical Institute (US)
- Corresponding author
- Nora, Elphège P.
- Bruneau, Benoit G.
- ORCID
- Venue
- Cell
- Publisher
- Elsevier BV
- Published
- 2017-05
- Volume
- 169
- Issue
- 5
- Pages
- 930-944.e22
- ISSN
- 0092-8674 (ISSN-L)
- PMC
- PMC5538188
- OpenAlex
- W2614144400
- Semantic Scholar
- e8afa0f77d39684b99c6679f6d08fd74cf1d90f5
- Cited by
- 1,709
- References
- 100
- Citations by year
- 2026: 146 · 2025: 162 · 2024: 172 · 2023: 187 · 2022: 204 · 2021: 231 · 2020: 207 · 2019: 196 · 2018: 139 · 2017: 63
- FWCI
- 67.99
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-nd)
- eScholarship (California Digital Library) (submittedVersion)
- The Journal of the American Medical Association (JAMA) Network (American Medical Association) (submittedVersion)
- HAL (submittedVersion)
- Funders
- EMBO (ALTF523-2013)
- HSFP
- NIH/National Heart, Lung, and Blood Institute
- Bench to Bassinet Program (U01HL098179)
- Gladstone Institutes
- William H. Younger, Jr
- UCSF-Gladstone Institute of Virology & Immunology Center for AIDS Research (NIH P30 AI027763)
- National Human Genome Research Institute (R01 HG003143, U54 HG007010)
- NIH Common Fund (U54 DK107980, U01 DA 040588)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chromatin Remodeling and Cancer
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nuclear Structure and Function
- Keywords
- CTCF, topologically associating domains, chromatin insulation, chromosome folding, 3D genome organization, enhancer blocking, heterochromatin spreading, auxin-inducible degron, mouse embryonic stem cells, chromatin looping
- MeSH terms
- CCCTC-Binding Factor, Animals, Cell Cycle, Chromatin, Gene Expression Regulation, Indoleacetic Acids, Repressor Proteins, Transcription, Genetic, Chromosomes, Mammalian, Mice, Embryonic Stem Cells
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
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