SRG3, a core component of mouse SWI/SNF complex, is essential for extra-embryonic vascular development

Developmental Biology
Daehee HanR H Seong

Abstract

The SWI/SNF chromatin-remodeling complex functions as a transcriptional regulator and plays a significant role in cell proliferation, differentiation and embryonic development. SRG3, a homologue of human BAF155, is a core component of the mouse SWI/SNF chromatin remodeling complex. Mutant mice deficient in Srg3 expression are peri-implantation lethal. To investigate the role of SRG3 in the post-implantation stage, we generated SRG3 transgene-rescued (Srg3-/-Tg+) embryos by inducing exogenous gene expression. These Srg3-/-Tg+ embryos overcame early embryonic lethality and extended the life span until mid-gestation. However, the embryos displayed significant defects in blood vessel formation and fetal circulation within the yolk sac around embryonic day 10.5, which led to developmental retardation and death. We found that SRG3 expression was absent in the visceral endoderm of Srg3-/-Tg+ yolk sacs, while SRG3 was normally expressed in wild-type embryos. In addition, expression of angiogenesis-related genes, including Angiopoietin1, Tie2, EphrinB2, Ihh and Notch1, was markedly reduced in Srg3-/-Tg+ yolk sacs. During normal angiogenesis, maturation of the visceral endoderm development is observed in the yolk sac. However, in Srg3-/-...Continue Reading

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