Cohesins Form Chromosomal Cis-interactions at the Developmentally Regulated IFNG Locus

Overview

Journal Nature

Specialty Science

Date 2009 May 22

PMID 19458616

Citations 310

Authors

Suzana Hadjur

Luke M Williams

Natalie K Ryan

Bradley S Cobb

Tom Sexton

Peter Fraser

Amanda G Fisher

Matthias Merkenschlager

Affiliations

Soon will be listed here.

Abstract

Cohesin-mediated sister chromatid cohesion is essential for chromosome segregation and post-replicative DNA repair. In addition, evidence from model organisms and from human genetics suggests that cohesin is involved in the control of gene expression. This non-canonical role has recently been rationalized by the findings that mammalian cohesin complexes are recruited to a subset of DNase I hypersensitive sites and to conserved noncoding sequences by the DNA-binding protein CTCF. CTCF functions at insulators (which control interactions between enhancers and promoters) and at boundary elements (which demarcate regions of distinct chromatin structure), and cohesin contributes to its enhancer-blocking activity. The underlying mechanisms remain unknown, and the full spectrum of cohesin functions remains to be determined. Here we show that cohesin forms the topological and mechanistic basis for cell-type-specific long-range chromosomal interactions in cis at the developmentally regulated cytokine locus IFNG. Hence, the ability of cohesin to constrain chromosome topology is used not only for the purpose of sister chromatid cohesion, but also to dynamically define the spatial conformation of specific loci. This new aspect of cohesin function is probably important for normal development and disease.

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