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Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
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The ChroP Approach Combines ChIP and Mass Spectrometry to Dissect Locus-specific Proteomic Landscapes of Chromatin
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Structural variation-associated expression changes are paralleled by chromatin architecture modifications.

Nele Gheldof1, Robert M Witwicki, Eugenia Migliavacca

  • 1Center for Integrative Genomics, University of Lausanne, Lausanne, Switzerland.

Plos One
|November 23, 2013
PubMed
Summary
This summary is machine-generated.

Large genomic rearrangements, such as copy number variants (CNVs), alter gene expression by changing how DNA folds. This study reveals how these structural variants disrupt gene interactions and expression, impacting phenotypes.

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Area of Science:

  • Genomics
  • Epigenetics
  • Molecular Biology

Background:

  • Copy number variants (CNVs) can affect gene expression beyond the rearranged region.
  • Understanding the mechanisms behind this
  • neighboring effect
  • is crucial for deciphering genomic disorder phenotypes.

Purpose of the Study:

  • To investigate the mechanisms underlying the influence of CNVs on flanking gene expression.
  • To compare intrachromosomal interactions and histone modifications in patients with genomic disorders and controls.

Main Methods:

  • Chromosome conformation capture (4C-seq) was employed to analyze intrachromosomal interactions.
  • Histone modifications were assessed in cell lines from patients and controls.

Main Results:

  • Genes flanking the Williams-Beuren Syndrome critical region (WBSCR) showed altered looping patterns.
  • The gene AUTS2, linked to autism and intellectual disabilities, was identified as an interacting gene.
  • Deletion of WBSCR disrupted expression of flanking genes and their long-range interactions, alongside changes in histone modifications.

Conclusions:

  • Large genomic rearrangements can induce widespread chromatin conformation changes.
  • These conformational alterations extend beyond the immediate vicinity of the structural variant.
  • Such changes may globally modulate gene expression and contribute to phenotypic modifications.