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Impact of Genetic Polymorphisms on Human Immune Cell Gene Expression
Open accessAbstract
SUMMARY While many genetic variants have been associated with risk for human diseases, how these variants affect gene expression in various cell types remains largely unknown. To address this gap, the DICE (Database of Immune Cell Expression, Expression quantitative trait loci (eQTLs) and Epigenomics) project was established. Considering all human immune cell types and conditions studied, we identified cis-eQTLs for a total of 12,254 unique genes, which represent 61% of all protein-coding genes expressed in these cell types. Strikingly, a large fraction (41%) of these genes showed a strong cis-association with genotype only in a single cell type. We also found that biological sex is associated with major differences in immune cell gene expression in a highly cell-specific manner. These datasets will help reveal the effects of disease risk-associated genetic polymorphisms on specific immune cell types, providing mechanistic insights into how they might influence pathogenesis (http://dice-database.org).
Overview
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TL;DR
The DICE project mapped transcriptomes and cis-eQTLs across 13 human immune cell types and activation conditions from 91 healthy subjects, identifying 12,254 eGenes with highly cell-specific genetic effects. It also found extensive sex-biased immune gene expression and linked GWAS disease variants to specific immune cell types.
Key findings
- cis-eQTLs were identified for 12,254 unique genes, representing 61% of expressed protein-coding genes and 49% of lncRNAs; 41% showed a strong cis-association with genotype in only a single cell type. More than 2,000 eGenes were found per common cell type, and CD4+ memory/TREG subsets yielded over 7,800 eGenes, of which >2,500 were unique to those subsets.
- About 19% of eGenes per immune cell type overlapped GWAS SNPs (2,297 unique GWAS eGenes; 599–987 eGenes/cell type), and for about 36% of these eGenes associations were observed in only one or two cell types. Examples included IRAK3 in naïve B cells (rs1732886, adj. P = 6.82 × 10−17) and NAB1 in NK cells (rs13028201, adj. P = 1.41 × 10−14).
- Sex-biased expression was found for 1,875 unique transcripts, including 1,553 protein-coding transcripts and 196 lncRNAs; 93% were autosomal and >72% showed sex-biased expression in only a single immune cell type. FAM13A was female-biased in naïve CD4+ T cells, with homozygous CC versus TT females showing 3.5-fold greater FAM13A transcripts compared to <1.5-fold in males.
- Cell-specific transcriptional signatures included 4,602 highly cell-specific transcripts, and differential expression among CD4+ T cell subsets revealed over 700 genes enriched in one specific subset.
Methods
- The study analyzed 13 immune cell types plus activated naïve CD4+ and CD8+ T cells from 106 leukapheresis samples provided by 91 healthy subjects (54 males, 37 females; median age 27 years, range 18–61).
- RNA-seq was performed on FACS-sorted cells, with genotyping and imputation using the 1,000 Genomes Project phase 3 reference; cis-eQTLs were tested within ±1 Mb of the transcription start site using Matrix eQTL with thresholds FDR < 0.05, raw P < 0.0001, and TPM > 1.0.
- Differential expression used DESeq2; GWAS overlap used PheGenI data with 14,321 lead GWAS SNPs and 846 traits; functional validation used siRNA knockdowns in primary immune cells.
Limitations
- The paper states that next phases of DICE will add additional rare immune cell types and cell-specific epigenomic profiles, and that several lncRNA and disease-gene links require further study and functional confirmation.
- The cohort was limited to 91 healthy volunteers from the San Diego area with a median age of 27 years, so generalizability to older, diseased, or more ancestrally diverse populations is not established by this dataset.
- The eQTL analysis did not cover the pseudoautosomal regions of chr X or chr Y (stated in the paper), and it focused on cis windows of ±1 Mb around the TSS rather than trans effects.
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“which as a class were expressed at lower levels compared to protein-coding transcripts”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Transcriptome of common human immune cell types
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In the paper
“Considering all human immune cell types and conditions studied, we identified cis-eQTLs for a total of 12,254 unique genes”
§ Impact of genetic polymorphisms on human immune cell gene expression > Abstract
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“RNA-Seq analysis showed that similar numbers of transcripts (ranging from 14,500 to 17,000, ~39% of all annotated transcripts) were detected (>1.0 transcripts per million, TPM) across all cell types and activation conditions”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Transcriptome of common human immune cell types
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In the paper
“We also found that biological sex is associated with major differences in immune cell gene expression in a highly cell-specific manner.”
§ Impact of genetic polymorphisms on human immune cell gene expression > Abstract
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“representing 61% of all expressed protein-coding genes and 49% of all lncRNAs, respectively”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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In the paper
“Strikingly, a large fraction (41%) of these genes showed a strong cis-association with genotype only in a single cell type.”
- Also stated in: § Abstract · plain
“a large fraction (41%) of these genes showed a strong cis-association with genotype only in a single cell type”
§ Impact of genetic polymorphisms on human immune cell gene expression > Abstract
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“which represent 61% of all protein-coding genes expressed in these cell types”
§ Impact of genetic polymorphisms on human immune cell gene expression > Abstract
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“Interestingly, several lncRNAs showed high abundance in specific immune cell types.”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell-specific transcriptional signatures
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In the paper
“We also identified 2 genes in the Fc receptor like (FCRL) gene locus that showed strong cis-eQTLs primarily in TREG subsets”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > CD4+ T cell subset-specific eQTLs
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In the paper
“NCF4, which encodes neutrophilic cytosolic factor 4, a component of the NADPH oxidase complex, showed prominent cis-QTLs specifically in CD4+ T subsets”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > CD4+ T cell subset-specific eQTLs
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In the paper
“the ERAP2 peak eQTL (rs2548540), which was also a lead GWAS SNP for multiple autoimmune diseases, caused genotype-dependent expression differences across all the immune cell types studied”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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“two genes in the CD96 locus that showed strong cis-eQTLs exclusively in naïve B cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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In the paper
“4,602 transcripts showed highly cell-specific expression patterns”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell-specific transcriptional signatures
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“We identified additional cis-eQTLs for >1,300 genes exclusively in activated naïve CD4+ and/or CD8+ T cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“we identified >2,000 eGenes (ranging from 2,381 to 3,560 eGenes/cell type, Fig. 4B) for each of the eight CD4+ T cell subsets”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > CD4+ T cell subset-specific eQTLs
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“The cell specificity of SNPs’ association was not entirely due to cell-specific expression of eGenes, as these associations were observed even for genes that were expressed at similar levels across multiple cell types”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“a large proportion (44%) of these genes showed a significant cis-association with genotype only in one cell type”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > CD4+ T cell subset-specific eQTLs
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“Knocking down GAB2 expression in naïve CD4+ T cells resulted in a significant reduction in the expression of activation markers (CD69, CD25 and HLA-DR) and cytokine transcripts (IFNG and IL2) following anti-CD3 and anti-CD28 stimulation”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“The cis-eQTLs were enriched within intronic regions of the genome”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“we confirmed that following activation, a greater proportion of CD4+ T cells expressed cell surface 4–1BB protein in subjects with the TNFRSF9 (4–1BB) expression-increasing allele (T/T genotype at rs9657975) compared to those with C/C genotype”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“This effect was not observed for other markers of activation such as CD69, CD25 or HLA-DR”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“several of the cis-eQTLs in the 12p13.2 locus directly overlapped many cell-specific DNase sites present in NK cells and naïve CD8+ T cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“The G allele at rs2927561 was associated with increased expression of all five activating NK receptors and two lncRNAs in the locus”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“An interesting eQTL (rs2511162) associated with GAB2 showed inverse effects on gene expression in B cells versus T cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“the majority (51%) of these genes showed a significant cis-association with genotype only in one specific cell type”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“12% of all cis-eQTLs were located within ±10 kb of the TSS”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“A noteworthy example of an eGene specific to the CD4+ memory and TREG subsets was ENTPD1 that encodes for CD39”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > CD4+ T cell subset-specific eQTLs
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“NAB1 knockdown also reduced IFN-γ release when NK cells were activated by co-culture with MHC devoid K-562 cancer cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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In the paper
“Homozygosity of the GA allele of rs149612031 (64% of our subjects) was associated with lack of expression of the CD96 and ZBED2 transcripts in B cells but not in other cell types such as NK cells and T cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“T cell subsets an association between RP11–77C3.3 and a SNP linked to Type 1 diabetes”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ Based: passesIn the paper
“rs12936231, a variant associated with several autoimmune diseases and asthma, whose functional effects have been previously described (Schmiedel et al., 2016), is associated with the modulation of expression of ORMDL3 and GSDMB in lymphocyte subsets and not in cells of myeloid origin.”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
What the sources say
- Not checked yetcites Schmiedel et al., 2016 source
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In the paper
“37% of all cis-eQTLs were located >100 kb from the TSS of the target gene”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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In the paper
“We identified >2,000 eGenes (ranging from 2,421 to 3,590 eGenes/cell type) for each of the indicated six common cell types”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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“Knocking down SYNGR1 also impacted cytokine production by activated NK cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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In the paper
“A ~240 kb dense haploblock of NK cell- and CD8+ T cell-specific cis-eQTLs at the 12p13.2 locus was associated with the expression of three lncRNAs and six C-type lectin-like receptors, including 5 activating NK receptors (KLRK1, KLRC4-KLRK1, KLRC4, KLRC3, KLRC2) and an inhibitory receptor (KLRC1)”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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In the paper
“We found that reducing NAB1 expression in NK cells significantly reduced the release of pro-inflammatory cytokines/chemokines such as IFN-γ, MIP-1β, RANTES and TNF by human NK cells activated by IgG crosslinking”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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In the paper
“We found that LACC1 knockdown in CD4+ T cells when compared to control siRNA treatment resulted in significantly reduced activation (CD25 and HLA-DR surface expression) and expression of cytokine transcripts (IFNG and IL2) following TLR1/2 co-stimulation and CD3/CD28 stimulation”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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In the paper
“IRAK3 showed a peak cis-eQTL (rs1732886, adj. association P = 6.82 × 10−17) only in naïve B cells even though it was expressed at even higher levels in classical and non-classical monocytes”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
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In the paper
“about 19% of all the eGenes identified in each human immune cell type (2,297 unique GWAS eGenes; 599 to 987 eGenes/cell type) were also associated with GWAS SNPs”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Rests on an assumption: Overlap between GWAS SNPs and eQTLs indicates that the disease risk variant modulates expression of the linked gene in the susceptible cell type.
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In the paper
“we observed that LACC1 was upregulated more than 10-fold following activation of T cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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In the paper
“Differential gene expression analysis among the CD4+ T cell subsets revealed over 700 genes that were enriched for expression in one specific CD4+ T cell subset”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell-specific transcriptional signatures
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“for about 36% of the eGenes associations were observed in only one or two cell types”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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“NK cells displayed highly significant eQTLs associated with the lncRNAs RP11–973H7.1 and RP11–305L7.1”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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“Overall, we report on transcripts with sex-biased expression in specific immune cell types”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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“This effect was also observed in TH1/17, TH17 and TFH CD4+ T cell subsets”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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“A CD-risk variant (rs528101238) was associated with expression of EDN3, encoding for endothelin 3, mainly in TH2 cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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In the paper
“of which 93% were transcribed from autosomes”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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In the paper
“TFH cells that play an important role in ‘helping’ B cell responses showed a prominent association for an eGene (TSPAN32) linked to a B cell malignancy (chronic lymphocytic leukemia, CLL).”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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In the paper
“We found that IL22 transcript level was most significantly reduced in FAM13A knock down conditions compared to control siRNA treatment”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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In the paper
“FAM13A (family with sequence similarity 13 gene) was expressed at higher levels in the naïve CD4+ T cells of female subjects.”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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“in classical monocytes alone, over 50 transcripts linked to the interferon pathway, including inflammatory cytokines and chemokines like IL6, TNF, CXCL10, displayed sex-biased expression, and enhanced expression was very prominent in some female subjects”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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In the paper
“PTGER2, which encodes the prostaglandin receptor E2 (EP2), displayed one of the most significant female-biased increased expression patterns, specifically in naïve and memory T cell subsets”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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In the paper
“We then independently confirmed at the protein level a significant reduction in the proportion of IL-22 producing memory CD4+ T cells following FAM13A knockdown”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Rests on an assumption: Knockdown of a gene in immune cells reflects the functional consequence of genetically reduced expression of that gene.
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
“Interferons (type 1 and type 2), interferon regulatory factors (IRFs), toll-like receptors (TLRs), and TLR ligands were also predicted by Ingenuity pathway analysis (IPA) to be upstream regulators of sex-biased transcripts”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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
“The majority (>72%) of these transcripts showed pronounced sex-biased expression pattern in only a single immune cell type”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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
“We also found female-biased expression of NLRP2”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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
“Independent pathway analysis of female-biased transcripts for each cell type revealed enrichment of genes encoding products involved in the canonical interferon and pattern recognition receptor pathways”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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
“we performed differential gene expression (DE) analysis between sexes considering ancestry and age as covariates. 1,875 unique transcripts, including 1,553 protein-coding transcripts and 196 lncRNAs, were differentially expressed between sexes (‘sex-biased transcripts’) across all the cell types investigated in this study”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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
“suggesting that genetic variants may correlate with expression of more distant target genes.”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
Strength:hedged· not yet calibratedCausal:correlational· 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
“which suggested that this allele, if causally linked to gene expression, is likely to confer NK cells with an enhanced activation potential”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Expression QTLs are highly cell-specific
Strength:hedged· not yet calibratedCausal:conditional· 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
“Our results suggested that FAM13A is a positive regulator of IL-22 production by memory CD4+ T cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Rests on an assumption: Knockdown of a gene in immune cells reflects the functional consequence of genetically reduced expression of that gene.
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
“Our results suggested that genotype-dependent perturbations in the expression patterns of several important genes involved in human TREG function is likely to have an impact on autoimmune disease pathogenesis.”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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
“and thus females with higher expression of FAM13A are likely to have more pronounced IL-22 responses in vivo”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes- Rests on an assumption: Knockdown of a gene in immune cells reflects the functional consequence of genetically reduced expression of that gene.
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 observed no batch effects by standard principal component analysis and multidimensional scaling analysis.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > RNA-Seq analysis
Strength:plain· 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
“Overall, these examples show that the effects of disease risk alleles may not necessarily be most prominent in the cell type in which the associated gene is most highly expressed.”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
Load-bearingStrength:hedged· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passes
- Probably not a substantial claim. 17
- It may state two separate claims as one. 18
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
“About 18% of these transcripts were long-noncoding RNAs (lncRNAs)”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Transcriptome of common human immune cell types
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
“Though a majority of transcripts were detected in multiple cell types (Fig. S1H,I), their relative abundance varied substantially, resulting in distinct clustering patterns of different cell types”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Transcriptome of common human immune cell types
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.
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 PBC-risk variant rs74804869 influenced SYNGR1 expression in NK and also CD8+ T cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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
“Our eQTL analysis of CD4+ memory and TREG subsets yielded over 7,800 eGenes, of which >2,500 were unique to these subsets”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > CD4+ T cell subset-specific eQTLs
Load-bearingStrength:plain· not yet calibratedTests✓ 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
“the CD-risk variant (rs9567293C/C) was associated with reduced expression of LACC1 in CD4+ memory T cell subsets, as well as in resting and activated naïve T cells but not in monocytes”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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
“we found that the expression of NAB1 displayed prominent genotype-dependent association (rs13028201, adj. P = 1.41 × 10−14) only in NK cells”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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
“CCNG2, encoding for a cell cycle protein, cyclin G2, showed a peak eQTL (rs4859751) specifically in TH1/17 and TH17 cells although it was also highly expressed in other TH subsets and immune cell types”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > CD4+ T cell subset-specific eQTLs
Strength:plain· not yet calibratedCausal:correlational· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ 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
“an RA-risk variant (rs3093026) and celiac disease-risk variant (rs7374671) that were associated with expression of chemokine receptor genes CCR6 and CCR2, respectively, in TH1/17 and TH17 subsets”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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
“1,875 unique transcripts, including 1,553 protein-coding transcripts and 196 lncRNAs, were differentially expressed between sexes”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
Strength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes? Load-bearing: unclear✓ 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
“We also found a cis-eQTL (rs1246642) whose impact on expression was stronger in female subjects (Fig. 6F,G and Fig. S6B,C); homozygous females carrying the CC versus TT genotype had 3.5-fold greater levels of FAM13A transcripts compared to a <1.5-fold increase in males.”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Sex has major effects on immune cell gene expression
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
“TREG cells were most susceptible to the effects of several autoimmune disease-risk variants. Notable eGenes associated with these variants include IKZF4, PDE4A and PTGIR”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
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
“Together, these results suggested that PBC-risk variants that modulate NAB1 and SYNGR1 expression are likely to impact NK cell function and influence PBC disease susceptibility.”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
- Rests on an assumption: Overlap between GWAS SNPs and eQTLs indicates that the disease risk variant modulates expression of the linked gene in the susceptible cell type.
- Rests on an assumption: Knockdown of a gene in immune cells reflects the functional consequence of genetically reduced expression of that gene.
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 identity of all individual RNA-Seq samples was confirmed by cross-comparison with genotyping data for a given subject by genome-wide analysis of SNPs overlapping exons.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > RNA-Seq analysis
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
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
“Further, samples from each specific cell types were processed for RNASeq in one batch to avoid any experimental batch effects.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > RNA-Seq analysis
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
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
“Sex-biased transcripts were identified by performing pairwise comparison (female (n = 37) versus male (n = 54) subjects) using DESeq2 and considering ancestry and age as covariates; we considered a transcript expressed differentially when the DESeq2 analysis resulted in a Benjamini-Hochberg adj. P value of < 0.05.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > 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
“The first two principal components of the genotyping data were used as covariates to minimize possible differences introduced by the different ancestry in the samples.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > Genotyping, imputation and determination of Eqtl
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
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 Institutional Review Board (IRB) of the La Jolla Institute for Allergy and Immunology (LJI; IRB protocol no. SGE-121–0714) approved the study.”
§ Impact of genetic polymorphisms on human immune cell gene expression > STAR METHODS > EXPERIMENTAL MODEL AND SUBJECT DETAILS
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
“To diminish the effects of possible outliers, the regularized log transformation of the DESeq2 package (Love et al., 2014) was applied and the homoscedastic data were then quantile-normalized.”
- Also stated in: § Genotyping, imputation and determination of Eqtl · plain
“The regularized log transformation of the DESeq2 package (Love et al., 2014) was applied and the homoscedastic data were then quantile-normalized to diminish the effects of possible outliers.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > RNA-Seq analysis
What the sources say
- Not checked yetcites Love et al., 2014 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.
- Also stated in: § Genotyping, imputation and determination of Eqtl · plain
In the paper
“The data quality was assessed using the snpQC package (Gondro et al., 2014) for R v3.2.3 (http://www.R-project.org) and low-quality SNPs were removed for downstream analysis: SNPs failing in more than 5% of the samples and SNPs with Illumina’s GC scores less than 0.2 in more than 10% of the samples were filtered out.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > Genotyping, imputation and determination of Eqtl
What the sources say
- Not checked yetcites Gondro et al., 2014 source
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim. It may state two separate claims as one.
In the paper
“To define the collection of SNPs from GWAS studies, we downloaded the dataset of the Phenotype-Genotype Integrator (PheGenI) (Ramos et al., 2014), which merges NHGRI GWAS Catalog data with several databases of the National Center for Biotechnology Information (NCBI), including Gene, dbGaP, OMIM, eQTL and dbSNP (September 2017; https://www.ncbi.nlm.nih.gov/gap/phegeni).”
- Also stated in: § GWAS SNP database construction and analysis · plain
“the resulting catalog of SNP-trait associations included 14,321 significant associations (lead GWAS SNPs; defined as P < 5 × 10−8) and 846 distinct phenotypes/traits.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > GWAS SNP database construction and analysis
What the sources say
- Not checked yetcites Ramos et al., 2014 source
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesIt may state two separate claims as one.
- Also stated in: § GWAS SNP database construction and analysis · plain
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
“Transcripts with mean TPM < 1.0 across all samples of a given cell type were excluded from the analysis.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > 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.
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
“Thus, the products of autoimmune risk-eGenes PDE4A and PTGIR are likely to modulate cAMP-mediated immunoregulation and influence disease pathogenesis.”
§ Impact of genetic polymorphisms on human immune cell gene expression > RESULTS > Cell types most susceptible to GWAS SNPs
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ 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
“Notably, the eQTL analysis did not cover the pseudoautosomal regions of chr X or chr Y, thereby slightly lowering the annotated transcript count from 57,820 to 57,215 (605 missing genes).”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > Genotyping, imputation and determination of Eqtl
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.
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
“SNPs missing for more than 5% of the samples or with a minimum allele frequency (MAF) lower than 5% were removed from the analysis.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > Genotyping, imputation and determination of Eqtl
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
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
“Briefly, transcripts with low expression values – the bottom one-third of all transcripts for at least 80% of the samples – were filtered out.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > Genotyping, imputation and determination of Eqtl
Load-bearingStrength:plain· not yet calibratedTests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim.
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 cohort consisted of 54 males and 37 female subjects with a median age of 27 years (range 18 to 61 years).”
§ Impact of genetic polymorphisms on human immune cell gene expression > STAR METHODS > EXPERIMENTAL MODEL AND SUBJECT DETAILS
Strength:plain· not yet calibratedn = 91Tests✓ 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
“Samples failing any quality control step (RNA quality and quantity, PCR amplification, library fragment size) were eliminated from further downstream steps.”
- Also stated in: § QUANTIFICATION AND STATISTICAL ANALYSIS · plain
“Any samples failing established quality controls (QC) were eliminated from downstream analysis; assay details and QCs on RNA-Seq samples included are provided in Table S1B (1,544 samples in total).”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > RNA sequencing
Strength:plain· not yet calibratedn = 1,544Tests✓ 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.
- Also stated in: § QUANTIFICATION AND STATISTICAL ANALYSIS · plain
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
“Sequencing library preparation steps were performed in a 96-well format, utilizing the automated platform Biomek FXP (Beckman Coulter), to reduce assay-to-assay variability.”
§ Impact of genetic polymorphisms on human immune cell gene expression > METHOD DETAILS > RNA sequencing
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.
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
“A total of 91 healthy volunteers were recruited in the San Diego area, who provided leukapheresis samples at the San Diego Blood Bank (SDBB) after written informed consent.”
§ Impact of genetic polymorphisms on human immune cell gene expression > STAR METHODS > EXPERIMENTAL MODEL AND SUBJECT DETAILS
Tests✓ Asserted: passes✓ Checkable: passes✓ Load-bearing: passes✓ Based: passesProbably not a substantial claim. 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
“All study subjects self-reported ethnicity and race details, and were tested negative for hepatitis B, hepatitis C and human immunodeficiency virus (HIV).”
§ Impact of genetic polymorphisms on human immune cell gene expression > STAR METHODS > EXPERIMENTAL MODEL AND SUBJECT DETAILS
Strength:plain· not yet calibratedn = 91Tests✓ 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.
The paper relies on this without support.
Overlap between GWAS SNPs and eQTLs indicates that the disease risk variant modulates expression of the linked gene in the susceptible cell type.
“To shed light on the disease relevance of the eQTLs identified in human immune cells, we next focused on the subset of eGenes linked to eQTLs that directly overlapped haploblocks of significant GWAS SNPs”
The paper relies on this without support.
Knockdown of a gene in immune cells reflects the functional consequence of genetically reduced expression of that gene.
“As a first step in that process, we knocked down these genes in human NK cells and tested their impact on NK cell activity”
The paper relies on this without support.
The 13 immune cell types and activation conditions studied are representative enough of human immune cells to generalize eQTL and sex-biased expression findings.
“The cell types presented here comprise over 60% of all circulating mononuclear cells”
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?
In the citing paper
“Within these correlated gene sets were genes known to be enriched or functionally important in the memory T cell subset driven by the TF in question, such as IL4R for GATA3 and CTLA4 for both Helios and FOXP324.”
From NEAT-seq: simultaneous profiling of intra-nuclear proteins, chromatin accessibility and gene expression in single cells (2022) · cites this paper as [24]
Citations
Cites
Moderated estimation of fold change and dispersion for RNA-seq data with DESeq2
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PLINK: a tool set for whole-genome association and population-based linkage analyses.
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HTSeq—a Python framework to work with high-throughput sequencing data
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Sex differences in immune responses
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Integrative analysis of 111 reference human epigenomes
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“…large-scale epigenomic initiatives analyzing multiple human cell types have attributed cis-regulatory function to nearly 20% of the non-coding DNA sequences, and showed that disease risk variants are enriched in cell-specific cis-regulatory DNA sequences (Roadmap Epigenomics et al., 2015).”
PD-1 and Its Ligands in Tolerance and Immunity
Keir, M. E., Butte, M. J., Freeman, G. J., & Sharpe, A. H. (2008) · Annual Review of Immunology · doi:10.1146/annurev.immunol.26.021607.090331 · Cited by 5,378
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The GTEx Consortium, Ardlie, K. G., Deluca, D. S., Segrè, A. V., Sullivan, T. J., Young, T. R., Gelfand, E. T., Trowbridge, C. A., Maller, J. B., Tukiainen, T., et al. (2015) · Science · doi:10.1126/science.1262110 · Cited by 5,062
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The gasdermins, a protein family executing cell death and inflammation
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Metadata
- Authors
- Schmiedel, B. J., Singh, D., Madrigal, A., Valdovino-Gonzalez, A. G., White, B. M., Zapardiel-Gonzalo, J., Ha, B., Altay, G., Greenbaum, J. A., McVicker, G., Seumois, G., Rao, A., Kronenberg, M., Peters, B., & Vijayanand, P.
- Affiliations
- La Jolla Institute for Immunology (US)
- Salk Institute for Biological Studies (US)
- Corresponding author
- Vijayanand, Pandurangan
- ORCID
- Venue
- Cell
- Publisher
- Elsevier BV
- Published
- 2018-11
- Volume
- 175
- Issue
- 6
- Pages
- 1701-1715.e16
- ISSN
- 0092-8674 (ISSN-L)
- PMC
- PMC6289654
- OpenAlex
- W2901765988
- Semantic Scholar
- 0b385de9f5adec440b108379bcbf8f8f00d13552
- Cited by
- 867
- References
- 68
- Citations by year
- 2026: 87 · 2025: 124 · 2024: 148 · 2023: 114 · 2022: 137 · 2021: 133 · 2020: 77 · 2019: 43 · 2018: 2
- FWCI
- 39.71
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Cell (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- ePrints Soton (University of Southampton) (acceptedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- B.P. Koirala Institute of Health Sciences (S10RR027366, S10OD016262)
- National Institutes of Health (R24 AI108564)
- William K. Bowes, Jr. Foundation
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Associations and Epidemiology
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Mapping and Diversity in Plants and Animals
- Keywords
- genetic polymorphism, immune cell gene expression, cis-eQTL, expression quantitative trait loci, single-cell transcriptomics, sex differences in gene expression, cell type-specific gene regulation, immune cell types
- MeSH terms
- Adolescent, Adult, Female, Gene Expression Regulation, Genotype, Humans, Male, Middle Aged, Sex Characteristics, Polymorphism, Single Nucleotide, Gene Expression Profiling, Quantitative Trait Loci, Genome-Wide Association Study
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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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