Journal
DEVELOPMENT
Volume 135, Issue 3, Pages 493-500Publisher
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/dev.010090
Keywords
SWI/SNF; Brg1; Tie2-Cre; erythropoiesis; beta-globin; vascular remodeling; angiogenesis
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Funding
- NHLBI NIH HHS [K99 HL087621, K99 HL087621-02] Funding Source: Medline
- NICHD NIH HHS [R01 HD036655] Funding Source: Medline
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ATP-dependent chromatin-remodeling complexes contribute to the proper temporal and spatial patterns of gene expression in mammalian embryos and therefore play important roles in a number of developmental processes. SWI/ SNF-like chromatin-remodeling complexes use one of two different ATPases as their catalytic subunit: brahma (BRM, also known as SMARCA2) and brahma-related gene 1 (BRG1, also known as SMARCA4). We have conditionally deleted a floxed Brg1 allele with a Tie2-Cre transgene, which is expressed in developing hematopoietic and endothelial cells. Brg1(fl/) (fl): Tie2-Cre(+) embryos die at midgestation from anemia, as mutant primitive erythrocytes fail to transcribe embryonic alpha-and beta-globins, and subsequently undergo apoptosis. Additionally, vascular remodeling of the extraembryonic yolk sac is abnormal in Brg1(fl/fl): Tie2-Cre(+) embryos. Importantly, Brm deficiency does not exacerbate the erythropoietic or vascular abnormalities found in Brg1(fl/fl): Tie2-Cre(+) embryos, implying that Brg1-containing SWI/ SNF-like complexes, rather than Brm-containing complexes, play a crucial role in primitive erythropoiesis and in early vascular development.
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