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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >RBX1/R0C1 disruption results in early embryonic lethality due to proliferation failure, partially rescued by simultaneous loss of p27
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RBX1/R0C1 disruption results in early embryonic lethality due to proliferation failure, partially rescued by simultaneous loss of p27

机译:RBX1 / R0C1破坏由于增殖失败而导致早期胚胎致死,通过同时丢失p27得以部分挽救

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摘要

RBX1 (RING box protein-1) or ROC1 (regulator of cullins-1) is the RING component of SCF (Skp1, Cullins, F-box proteins) E3 ubiquitin ligases, which regulate diverse cellular processes by targeting various substrates for degradation. However, the in vivo physiological function of RBX1 remains uncharacterized. Here, we show that a gene trap disruption of mouse Rbx1 causes embryonic lethality at embryonic day (E)7.5, mainly due to a failure in proliferation; p27, a cyclin dependent kinase inhibitor, normally undetectable in the early embryos, accumulates at high levels in the absence of Rbx1. Although mice heterozygous for the Rbx1 gene trap appear viable and fertile without obvious abnormalities, the Rbx1~(+/Gt) MEFs do show retarded growth with G1 arrest and p27 accumulation. Simultaneous loss of p27 extended the life span of Rbx1~(Gt/Gt) embryos from E6.5 to E9.5, indicating that p27-mediated cell cycle inhibition contributes to the early embryonic lethality in the Rbx1-deficient embryos. Our study demonstrates that the in vivo physiological function of RBX1 is to ensure cell proliferation by preventing p27 accumulation during the early stage of embryonic development.
机译:RBX1(RING盒蛋白-1)或ROC1(cullins-1的调节剂)是SCF(Skp1,Cullins,F-box蛋白)E3泛素连接酶的RING成分,它们通过靶向各种降解底物来调节多种细胞过程。但是,RBX1的体内生理功能仍未表征。在这里,我们表明,小鼠Rbx1的基因陷阱破坏在胚胎发生(E)7.5时会导致胚胎致死,这主要是由于增殖失败所致。 p27是一种细胞周期蛋白依赖性激酶抑制剂,通常在早期胚胎中无法检测到,在没有Rbx1的情况下会高水平积累。尽管对Rbx1基因陷阱杂合的小鼠表现出活力和繁殖力,但没有明显异常,但Rbx1〜(+ / Gt)MEF确实显示出生长迟缓,并伴有G1阻滞和p27积累。 p27的同时丢失将Rbx1〜(Gt / Gt)胚胎的寿命从E6.5延长到E9.5,这表明p27介导的细胞周期抑制有助于Rbx1缺陷胚胎的早期致死率。我们的研究表明,RBX1的体内生理功能是通过防止胚胎发育早期的p27积累来确保细胞增殖。

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  • 作者单位

    Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan Comprehensive Cancer Center, 4424B MS I, 1301 Catherine Street, Ann Arbor, Ml 48109-5936;

    Department of Human Genetics, 4909 Buhl SPC 5618, University of Michigan Medical School, Ann Arbor, Ml 48109-0669;

    Division of Molecular Medicine and Genetics, Department of Internal Medicine, Transgenic Animal Model Core, Biomedical Research Core Facilities, 2570 MSRB II, SRC 5674, University of Michigan Medical School, Ann Arbor, Ml 48109-0618;

    Division of Molecular Medicine and Genetics, Departments of Internal Medicine and Cell and Developmental Biology, University of Michigan Medical School, 2061 BSRB, 109 Zina Pitcher, Ann Arbor, Ml 48109-2200;

    Division of Radiation and Cancer Biology, Department of Radiation Oncology, University of Michigan Comprehensive Cancer Center, 4424B MS I, 1301 Catherine Street, Ann Arbor, Ml 48109-5936;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    SCF E3 ubiquitin ligase; protein degradation; growth suppression;

    机译:SCF E3泛素连接酶;蛋白质降解;生长抑制;

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