Cohesin Mediates Chromatin Interactions That Regulate Mammalian β-globin Expression

• Published in: The Journal of biological chemistry 2011-05, Vol.286 (20), p.17870-17878
• Main Authors: Chien, Richard, Zeng, Weihua, Kawauchi, Shimako, Bender, M.A., Santos, Rosaysela, Gregson, Heather C., Schmiesing, John A., Newkirk, Daniel A., Kong, Xiangduo, Ball, Alexander R., Calof, Anne L., Lander, Arthur D., Groudine, Mark T., Yokomori, Kyoko
• Format: Article
• Language: English
• Subjects: Animals; beta-Globins - biosynthesis; beta-Globins - genetics; CCCTC-Binding Factor; Cell Cycle Proteins - genetics; Cell Cycle Proteins - metabolism; Cell Differentiation; Chromatin - genetics; Chromatin - metabolism; Chromatin Immunoprecipitation (ChiP); Chromatin Regulation; Chromosomal Proteins, Non-Histone - genetics; Chromosomal Proteins, Non-Histone - metabolism; Cohesin; Cohesins; CTCF; Development; Enhancer Elements, Genetic - physiology; Gene Expression Regulation - physiology; Gene Regulation; Humans; Insulator Elements - physiology; K562 Cells; Locus Control Region; Mice; Mutation; Nipbl; Proteins - genetics; Proteins - metabolism; Repressor Proteins - genetics; Repressor Proteins - metabolism; Transcription Factors - genetics; Transcription Factors - metabolism; β-globin
• ISSN: 0021-9258; 1083-351X
• DOI: 10.1074/jbc.M110.207365

The β-globin locus undergoes dynamic chromatin interaction changes in differentiating erythroid cells that are thought to be important for proper globin gene expression. However, the underlying mechanisms are unclear. The CCCTC-binding factor, CTCF, binds to the insulator elements at the 5′ and 3′ boundaries of the locus, but these sites were shown to be dispensable for globin gene activation. We found that, upon induction of differentiation, cohesin and the cohesin loading factor Nipped-B-like (Nipbl) bind to the locus control region (LCR) at the CTCF insulator and distal enhancer regions as well as at the specific target globin gene that undergoes activation upon differentiation. Nipbl-dependent cohesin binding is critical for long-range chromatin interactions, both between the CTCF insulator elements and between the LCR distal enhancer and the target gene. We show that the latter interaction is important for globin gene expression in vivo and in vitro. Furthermore, the results indicate that such cohesin-mediated chromatin interactions associated with gene regulation are sensitive to the partial reduction of Nipbl caused by heterozygous mutation. This provides the first direct evidence that Nipbl haploinsufficiency affects cohesin-mediated chromatin interactions and gene expression. Our results reveal that dynamic Nipbl/cohesin binding is critical for developmental chromatin organization and the gene activation function of the LCR in mammalian cells.