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In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
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The C. elegans dosage compensation complex mediates interphase X chromosome compaction.

Alyssa C Lau1, Kentaro Nabeshima2, Györgyi Csankovszki1

  • 1Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI 48109 Michigan.

Epigenetics & Chromatin
|November 18, 2014
PubMed
Summary
This summary is machine-generated.

The dosage compensation complex (DCC) compacts X chromosomes in C. elegans hermaphrodites, linking chromosome condensation to gene repression. This process requires condensin I(DC) and specific histone modifiers for effective gene regulation.

Keywords:
Caenorhabditis elegansChromatinChromosome condensationCondensinDosage compensationEpigeneticsGene expressionInterphase chromosome

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Area of Science:

  • Genetics
  • Molecular Biology
  • Epigenetics

Background:

  • Dosage compensation equalizes X-linked gene expression between sexes.
  • In C. elegans, the dosage compensation complex (DCC) downregulates X-linked genes in hermaphrodites.
  • The DCC includes a condensin I(DC) subcomplex, suggesting a link to chromosome condensation.

Purpose of the Study:

  • To investigate the role of DCC and condensin complexes in X chromosome structure during interphase.
  • To determine if mitotic chromosome condensation mechanisms are involved in dosage compensation.
  • To identify factors required for DCC-mediated X chromosome compaction.

Main Methods:

  • 3D FISH microscopy to measure X chromosome territory volume and inter-locus distances.
  • Analysis of hermaphrodite worms deficient in DCC proteins.
  • Depletion of condensin I and II in hermaphrodite worms.
  • Assessment of histone modifiers SET-1, SET-4, and SIR-2.1.

Main Results:

  • Hermaphrodite worms lacking DCC proteins exhibit enlarged interphase X chromosomes, while other chromosomes remain unaffected.
  • X chromosome compaction is specifically mediated by condensin I(DC), not general condensin I or II.
  • Histone modifiers SET-1, SET-4, and SIR-2.1 are essential for DCC-mediated X chromosome compaction.

Conclusions:

  • Condensin I(DC) and DCC-regulated histone modifications drive interphase X chromosome compaction.
  • This study connects condensin-mediated chromosome compaction to chromosome-wide gene expression repression.
  • Findings provide experimental evidence for the role of chromosome condensation in dosage compensation.