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miR-290-295 缺失的小鼠表现为部分显性胚胎致死和生殖细胞缺陷。

Mir-290-295 deficiency in mice results in partially penetrant embryonic lethality and germ cell defects.

机构信息

Whitehead Institute for Biomedical Research, Cambridge, MA 02139, USA.

出版信息

Proc Natl Acad Sci U S A. 2011 Aug 23;108(34):14163-8. doi: 10.1073/pnas.1111241108. Epub 2011 Aug 15.

Abstract

Mir-290 through mir-295 (mir-290-295) is a mammalian-specific microRNA (miRNA) cluster that, in mice, is expressed specifically in early embryos and embryonic germ cells. Here, we show that mir-290-295 plays important roles in embryonic development as indicated by the partially penetrant lethality of mutant embryos. In addition, we show that in surviving mir-290-295-deficient embryos, female but not male fertility is compromised. This impairment in fertility arises from a defect in migrating primordial germ cells and occurs equally in male and female mutant animals. Male mir-290-295(-/-) mice, due to the extended proliferative lifespan of their germ cells, are able to recover from this initial germ cell loss and are fertile. Female mir-290-295(-/-) mice are unable to recover and are sterile, due to premature ovarian failure.

摘要

miR-290 到 miR-295(miR-290-295)是哺乳动物特异性 microRNA(miRNA)簇,在小鼠中,其特异性在早期胚胎和胚胎生殖细胞中表达。在这里,我们表明,miR-290-295 在胚胎发育中起着重要作用,突变胚胎的部分穿透致死性表明了这一点。此外,我们表明,在存活的 miR-290-295 缺陷胚胎中,雌性但不是雄性的生育能力受到损害。这种生育能力的损害源于迁移原始生殖细胞的缺陷,并且在雄性和雌性突变动物中同样发生。由于其生殖细胞的延长增殖寿命,雄性 miR-290-295(-/-)小鼠能够从这种初始生殖细胞损失中恢复,并且具有生育能力。由于卵巢早衰,雌性 miR-290-295(-/-)小鼠无法恢复,并且不育。

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