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Title: Dynamic BAF chromatin remodeling complex subunit inclusion promotes temporally distinct gene expression programs in cardiogenesis

Journal Article · · Development (Cambridge)
DOI:https://doi.org/10.1242/dev.174086· OSTI ID:1581103
 [1];  [2];  [2];  [3];  [1];  [4];  [5];  [4];  [2]; ORCiD logo [6]
  1. Gladstone Inst., San Francisco, CA (United States); Roddenberry Center for Stem Cell Biology and Medicine at Gladstone, San Francisco, CA (United States)
  2. Gladstone Inst., San Francisco, CA (United States); Univ. of California, San Francisco, CA (United States)
  3. Gladstone Inst., San Francisco, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  5. Univ. of Oxford (United Kingdom)
  6. Gladstone Inst., San Francisco, CA (United States); Roddenberry Center for Stem Cell Biology and Medicine at Gladstone, San Francisco, CA (United States); Univ. of California, San Francisco, CA (United States). Cardiovascular Research Inst.

Chromatin remodeling complexes instruct cellular differentiation and lineage specific transcription. The BRG1/BRM-associated factor (BAF) complexes are important for several aspects of differentiation. We show that the catalytic subunit gene Brg1 has a specific role in cardiac precursors (CPs) to initiate cardiac gene expression programs and repress non-cardiac expression. Using immunopurification with mass spectrometry, we have determined the dynamic composition of BAF complexes during mammalian cardiac differentiation, identifying several cell-type specific subunits. We focused on the CP- and cardiomyocyte (CM)-enriched subunits BAF60c (SMARCD3) and BAF170 (SMARCC2). Baf60c and Baf170 co-regulate gene expression with Brg1 in CPs, and in CMs their loss results in broadly deregulated cardiac gene expression. BRG1, BAF60c and BAF170 modulate chromatin accessibility, to promote accessibility at activated genes while closing chromatin at repressed genes. BAF60c and BAF170 are required for proper BAF complex composition, and BAF170 loss leads to retention of BRG1 at CP-specific sites. Thus, dynamic interdependent BAF complex subunit assembly modulates chromatin states and thereby participates in directing temporal gene expression programs in cardiogenesis.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1581103
Journal Information:
Development (Cambridge), Vol. 146, Issue 19; ISSN 0950-1991
Publisher:
Company of BiologistsCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (2)

Pioneering function of Isl1 in the epigenetic control of cardiomyocyte cell fate journal April 2019
Intrinsic Disorder of the BAF Complex: Roles in Chromatin Remodeling and Disease Development journal October 2019

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