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Genetic modifiers interact with maternal determinants in vascular development of Tgfb1(-/-) mice. | LitMetric

AI Article Synopsis

Article Abstract

The transforming growth factor beta signaling family is a key player in genetic and multifactorial diseases, including hereditary hemorrhagic telangiectasia (HHT), cancer, atherosclerosis and immunomodulation. HHT types 1 and 2 are caused by loss of function mutations in ENG and ACVRL1; polymorphisms in TBRI and TGFB1 are also associated with altered risks for cancer and cardiovascular diseases. There is therefore much interest in identifying factors that influence transforming growth factor beta1 (TGFbeta1) action in vivo. Here we identify a potent modifier locus, Tgfbkm2(129) (LOD=10.5, chromosome 1), that contributes over 90% of the genetic component determining survival to birth of Tgfb1(-/-) embryos in crosses between C57 and 129 mice, plus a suggestive modifier locus on chromosome 17 (LOD=3.7). Tgfb1(-/-) survival to birth (STB), in addition to dependence on embryonic Tgfbkm2 genotype, also depends on maternal effects. Fetal genotype and maternal factors interact to prevent Tgfb1(-/-) embryonic death due to defective yolk sac angiogenesis. C57 or C57/129.F1 mothers support high Tgfb1(-/-) STB rates, whereas 129 mothers do not. Strain differences in circulating maternal TGFbeta1 levels were excluded as the cause of this directional complementation. However, strong genetic support is provided for the involvement of maternal STB alleles of mitochondrial or imprinted genes that are only expressed when passed through the female lineage. Molecular identification of the functional gene(s) encoding Tgfbkm2 and its interacting maternal factors will be central to an understanding of the mode of action of TGFbeta1 in cardiovascular development.

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http://dx.doi.org/10.1093/hmg/ddg164DOI Listing

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