Title: BRG1 co-localizes with DNA replication factors and is required for efficient replication fork progression.

Authors: Cohen, Stephanie M; Chastain 2nd, Paul D; Rosson, Gary B; Groh, Beezly S; Weissman, Bernard E; Kaufman, David G; Bultman, Scott J

Published In Nucleic Acids Res, (2010 Nov)

Abstract: For DNA replication to occur, chromatin must be remodeled. Yet, we know very little about which proteins alter nucleosome occupancy at origins and replication forks and for what aspects of replication they are required. Here, we demonstrate that the BRG1 catalytic subunit of mammalian SWI/SNF-related complexes co-localizes with origin recognition complexes, GINS complexes, and proliferating cell nuclear antigen at sites of DNA replication on extended chromatin fibers. The specific pattern of BRG1 occupancy suggests it does not participate in origin selection but is involved in the firing of origins and the process of replication elongation. This latter function is confirmed by the fact that Brg1 mutant mouse embryos and RNAi knockdown cells exhibit a 50% reduction in replication fork progression rates, which is associated with decreased cell proliferation. This novel function of BRG1 is consistent with its requirement during embryogenesis and its role as a tumor suppressor to maintain genome stability and prevent cancer.

PubMed ID: 20571081

MeSH Terms: No MeSH terms associated with this publication