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In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
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Elizabeth Dufourcq Sekatcheff1, Christian Godon2, Aymeric Bailly3

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此摘要是机器生成的。

电离辐射会损害野生动物的繁殖,特别是无脊椎动物. 这项研究揭示了生命阶段依赖的分子通路,如细胞亡和Ras / ERK信号传递,是Caenorhabditis elegans中辐射诱导的生殖毒性的基础.

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科学领域:

  • 环境毒理学环境毒理学
  • 辐射生物学 辐射生物学
  • 分子生殖毒理学 分子生殖毒理学

背景情况:

  • 野生动物面临来自电离辐射 (IR) 的繁殖损害,影响人口动态.
  • 生殖是无脊椎动物中最放射敏感的终点,需要了解分子机制.
  • 之前的研究表明,由于IR,Caenorhabditis elegans的生殖能力下降取决于生命阶段.

研究的目的:

  • 精确识别IR诱导的生殖毒性的分子决定因素,重点是雌同体数量的减少.
  • 分析保存的分子通路 (亡,Ras/ERK) 进行跨物种的辐射敏感性推断.
  • 调查慢性红外辐射暴露对生殖通路的生命阶段相关影响.

主要方法:

  • 长期暴露的Caenorhabditis elegans的50mGy·h-1玛IR在胚胎发生,生育和充分发育期间.
  • 保护性亡和MAP激酶Ras/ERK (MPK-1) 途径参与生殖和应激反应的分析.
  • 亡的功能分析和胚胎细胞增殖和通路激活的评估.

主要成果:

  • 亡和Ras/ERK通路表现出生命阶段依赖的激活,从慢性IR暴露中积累损伤.
  • 观察到Ras/ERK通路的激活发生在生殖腺的包丁区域,但没有发生在排卵区.
  • 由DNA损伤引起的亡导致排卵率下降,而精子减少似乎与生殖细胞增殖速度有关,而不是亡.

结论:

  • 在Caenorhabditis elegans中,IR诱导的生殖毒性是由生命阶段依赖的分子通路介导的.
  • 亡导致排卵减少,但精子数量减少涉及其他需要进一步研究的机制.
  • 结果有助于理解性别特异性辐射敏感性,并支持对IR对人群影响的不良结果途径#396.