Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Curr Biol. 2009 Nov 17;19(21):1777-87. doi: 10.1016/j.cub.2009.09.047. Epub 2009 Oct 22.

The C. elegans dosage compensation complex propagates dynamically and independently of X chromosome sequence.

Author information

  • 1Department of Biology, Carolina Center for Genome Sciences and Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

Abstract

BACKGROUND:

The C. elegans dosage compensation complex (DCC) associates with both X chromosomes of XX animals to reduce X-linked transcript levels. Five DCC members are homologous to subunits of the evolutionarily conserved condensin complex, and two noncondensin subunits are required for DCC recruitment to X.

RESULTS:

We investigated the molecular mechanism of DCC recruitment and spreading along X by examining gene expression and the binding patterns of DCC subunits in different stages of development, and in strains harboring X;autosome (X;A) fusions. We show that DCC binding is dynamically specified according to gene activity during development and that the mechanism of DCC spreading is independent of X chromosome DNA sequence. Accordingly, in X;A fusion strains, DCC binding propagates from X-linked recruitment sites onto autosomal promoters as a function of distance. Quantitative analysis of spreading suggests that the condensin-like subunits spread from recruitment sites to promoters more readily than subunits involved in initial X targeting.

CONCLUSIONS:

A highly conserved chromatin complex is appropriated to accomplish domain-scale transcriptional regulation during C. elegans development. Unlike X recognition, which is specified partly by DNA sequence, spreading is sequence independent and coupled to transcriptional activity. Similarities to the X recognition and spreading strategies used by the Drosophila DCC suggest mechanisms fundamental to chromosome-scale gene regulation.

Comment in

PMID:
19853451
[PubMed - indexed for MEDLINE]
PMCID:
PMC2783177
Free PMC Article

Images from this publication.See all images (7)Free text

Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science Icon for PubMed Central Icon for Faculty of 1000
    Loading ...
    Write to the Help Desk