title: SRG3, a core component of mouse SWI/SNF complex, is essential for extra-embryonic vascular development.
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-/-Tg+ yolk sacs, the visceral endoderm did not develop normally. Our results indicate that SRG3 is required for angiogenesis and visceral endoderm development in the yolk sac.
authors.affiliation: Department of Biological Sciences, Institute of Molecular Biology and Genetics, and Research Center for Functional Cellulomics, Seoul National University, San 56-1, Shillim-dong, Kwanak-gu, Seoul, 151-742, Korea.
authors.forename: Daehee
authors.initials: D
authors.lastname: Han
authors.forename: Shin
authors.initials: S
authors.lastname: Jeon
authors.forename: Dong Hyun
authors.initials: DH
authors.lastname: Sohn
authors.forename: Changjin
authors.initials: C
authors.lastname: Lee
authors.forename: Sangil
authors.initials: S
authors.lastname: Ahn
authors.forename: Won Kyu
authors.initials: WK
authors.lastname: Kim
authors.forename: Heekyoung
authors.initials: H
authors.lastname: Chung
authors.forename: Rho Hyun
authors.initials: RH
authors.lastname: Seong
mesh_terms: D042683:Angiopoietin-1 / Q000378:metabolism; D000818:Animals; D001808:Blood Vessels / Q000196:embryology*; D002868:Chromosomal Proteins, Non-Histone / Q000235:genetics / Q000378:metabolism*; D004622:Embryo, Mammalian; D047108:Embryonic Development; D018507:Gene Expression Regulation, Developmental; D007150:Immunohistochemistry; D051379:Mice; D008822:Mice, Transgenic; D008957:Models, Genetic; D018919:Neovascularization, Physiologic; D019408:Platelet Endothelial Cell Adhesion Molecule-1 / Q000378:metabolism; D013047:Specific Pathogen-Free Organisms; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism* / Q000502:physiology*; D019076:Transgenes; D042461:Vascular Endothelial Growth Factor A / Q000378:metabolism; D015017:Yolk Sac / Q000002:abnormalities / Q000098:blood supply / Q000378:metabolism / Q000648:ultrastructure
chemical_list: D042683:Angiopoietin-1; D002868:Chromosomal Proteins, Non-Histone; D019408:Platelet Endothelial Cell Adhesion Molecule-1; C445179:SWI-SNF-B chromatin-remodeling complex; C491090:Smarcc1 protein, mouse; D014157:Transcription Factors; D042461:Vascular Endothelial Growth Factor A