Cited by 259Genetic Neurodegenerative DiseasesGenomics and Chromatin DynamicsGenetics and Neurodevelopmental Disorders

The DOI matches its Crossref record; 66 of the 67 references it cites were found in a registry or an index; none of the 56 sources its claims cite is checked for support yet.

Disease-Associated Short Tandem Repeats Co-localize with Chromatin Domain Boundaries

Open access

Abstract

Summary More than 25 inherited human disorders are caused by the unstable expansion of repetitive DNA sequences termed short tandem repeats (STRs). A fundamental unresolved question is why some STRs are susceptible to pathologic expansion, whereas thousands of repeat tracts across the human genome are relatively stable. Here, we discover that nearly all disease-associated STRs (daSTRs) are located at boundaries demarcating 3D chromatin domains. We identify a subset of boundaries with markedly higher CpG island density compared to the rest of the genome. daSTRs specifically localize to ultra-high-density CpG island boundaries, suggesting they might be hotspots for epigenetic misregulation or topological disruption upon STR expansion. Fragile X Syndrome patients exhibit severe boundary disruption in a manner that correlates with local loss of CTCF occupancy and the degree of FMR1 silencing. Our data uncover higher-order chromatin architecture as a new dimension in understanding repeat expansion disorders.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

Nearly all disease-associated short tandem repeats (daSTRs) localize to 3D chromatin domain boundaries, especially boundaries with ultra-high CpG island density and high CTCF occupancy. In Fragile X syndrome, the FMR1 boundary is disrupted in patients, correlating with local CTCF loss and FMR1 silencing.

Key findings

  • 22 of 27 daSTR loci localized to human ES cell boundaries, including 11 at TAD boundaries and 11 at subTAD boundaries; 21 of 23 neurological daSTRs localized to boundaries in human fetal cortical plate tissue.
  • daSTRs were significantly closer to domain boundaries than matched normal-length repeats (0 bp versus 5,203 bp median; P = 0.00074 Mann-Whitney U; P = 0.0037 Kolmogorov-Smirnov) and enriched at boundaries (odds ratio = 4.77, Fisher’s exact P = 0.00056).
  • daSTRs localized to CpG island-rich boundaries more than matched repeats (odds ratio = 10.4, P = 1.4E-8), with 65.7% of daSTRs at CpG island-rich boundaries versus 22.0% of matched repeats; no significant difference was found at CpG island-depleted boundaries or non-boundary CpG islands.
  • In Fragile X syndrome patient samples, the FMR1 TAD boundary was ablated, a CTCF doublet ~100 kb upstream was lost, and boundary disruption correlated with FMR1 silencing; these topological changes occurred in at least three cell types and four patients.

Methods

  • Analyzed published Hi-C data from human ES cells and human fetal cortical plate tissue, using DI+HMM for Mb-scale TADs and 3DNetMod for nested subTADs; daSTRs were mapped in hg19 and compared with normal-length repeats matched by repeat sequence, length range, and gene body placement.
  • Performed 5C, CTCF ChIP-seq, qRT-PCR for FMR1 expression, and Sanger sequencing in Fragile X syndrome patient and control B-lymphocytes, fibroblasts, and postmortem brain tissue.
  • Used Fisher’s exact, Kolmogorov-Smirnov, Cochran–Mantel–Haenszel, randomization, and bootstrapped tests to assess boundary localization and CpG island density.

Limitations

  • The paper states it does not aim to identify specific genetic variants predicting which individuals develop repeat expansion disorders, and that cause-and-effect relationships among boundary disruption, DNA methylation, CTCF occupancy, CpG islands, STR expansion, and gene expression remain unresolved.
  • The paper notes that statistical power was restricted by small daSTR class sizes, and that rigorous thresholds likely missed some visually evident boundaries, making boundary enrichment estimates conservative.
  • Evident from the text: the Fragile X syndrome topological analyses rely on a small number of patient samples and cell types, and the link between boundary disruption and FMR1 silencing is correlative rather than causal.

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Integrity signals

Registry

Crossref · 10.1016/j.cell.2018.08.005

Cites

66 of 67 references verified0 citation errors · 1 not checkable

Statistics

Nothing to recompute.

Verification

Claims the paper makes

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Show all 66 claims

  • It may state two separate claims as one. 26
  • Probably not a substantial claim. 32
  • The quote only partly states this claim. 1
48 of 48
  • The paper relies on this without support.

    The role for TAD boundaries in neurological disorders has not yet been reported.

    “but the role for TAD boundaries in neurological disorders has not yet been reported.”
  • The paper relies on this without support.

    Mapping daSTRs to normal-length repeat tracts in the hg19 reference genome is representative of disease-associated STR loci.

    “Because the samples are not diseased, we mapped daSTRs to the normal-length repeat tracts found in the hg19 reference genome (Tables S1-S3).”
  • The paper relies on this without support.

    Domain boundaries called in human ES cells and fetal cortical plate are relevant to the cell types of pathology for all daSTRs.

    “Thus, although the target cell type(s) for many unstable repeat expansion disorders are unknown, the strong enrichment at boundaries regardless of tissue origin suggests that daSTR co-localization with boundaries might be robust across cell types relevant for the pathology.”
3 of 3

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Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

  • Four daSTR classes account for only 25 of 26 tracts

    Minor

    The methods say that 26 daSTR tracts were subdivided into these four classes, but the listed class sizes sum to 25. One tract is unaccounted for.

    Reported 26 · recomputed 25

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Metadata

Authors
Sun, J. H., Zhou, L., Emerson, D. J., Phyo, S. A., Titus, K. R., Gong, W., Gilgenast, T. G., Beagan, J. A., Davidson, B. L., Tassone, F., & Phillips-Cremins, J. E.
Affiliations
  • University of Pennsylvania (US)
  • Children's Hospital of Philadelphia (US)
  • University of California, Davis (US)
Venue
Cell
Publisher
Elsevier BV
Published
2018-09
Volume
175
Issue
1
Pages
224-238.e15
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2889421335
Cited by
249
References
67
Citations by year
2026: 12 · 2025: 24 · 2024: 42 · 2023: 26 · 2022: 41 · 2021: 41 · 2020: 28 · 2019: 32 · 2018: 3
FWCI
12.41
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • The New York Stem Cell Foundation
  • Alfred P. Sloan Foundation
  • NIH Director’s New Innovator Award (1DP2MH11024701)
  • 4D Nucleome Common Fund (1U01HL12999801)
  • NIH (R01 GM113929)
  • NSF-NIGMS (1562665)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
Keywords
microsatellite markers, repeat expansion disorders, chromatin domain boundaries, CpG islands, fragile X syndrome, chromatin topology
MeSH terms
CCCTC-Binding Factor, Adult, Brain, Cell Line, Chromatin, Disease, DNA, Female, Fragile X Syndrome, Humans, Male, Genome, Human, Microsatellite Repeats, CpG Islands, Trinucleotide Repeat Expansion, Chromatin Assembly and Disassembly, Fragile X Messenger Ribonucleoprotein 1

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