鼠标CDK2的动态调节酸化发生在介质前期I期间
Rachel A Bradley1, Ian D Wolff1, Paula E Cohen1
1Department of Biomedical Sciences and Cornell Reproductive Sciences Center (CoRe), Cornell University, Ithaca, NY, 14853, United States of America.
bioRxiv : the preprint server for biology
|August 7, 2023
概括
这项研究揭示了介质分裂过程中循环林依赖激酶2 (CDK2) 的复杂时间调节. 抑制酸化发生在早期,而CDK233kDa异型的激活酸化在晚些时候被检测出来,与交叉标记物共定位.
科学领域:
- 细胞生物学 细胞生物学
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
背景情况:
- 半月变化对于性繁殖至关重要,涉及在前期I期间的同质染色体分离.
- DNA双链断裂 (DSB) 被修复为交叉,这是一个高度规范的过程,对于准确的分离至关重要.
- 循环素依赖性激酶2 (CDK2) 局部化到交叉位点,但其在化过程中的调节知之甚少.
研究的目的:
- 为了研究 CDK2 的时间酸化依赖的调节在介质变异的 I 预相期间.
- 了解不同CDK2异型及其酸化状态如何促进交叉调节.
主要方法:
- 传播精子细胞和固定丸部分的免疫光染色.
- STA-PUT重力沉积用于分离特定发育阶段的细胞.
- 西方涂抹分析CDK2异型水平和酸化状态.
主要成果:
- 在整个预相I期间观察到的两个CDK2异型 (CDK233kDa和CDK239kDa) 的差异表达.
- CDK2在氨酸15 (Y15) 的抑制酸化发生在前期I的早期,局部化到端粒.
- 激活CDK233kDa异型在氨酸160 (T160) 的酸化发生在以后,与精子和帕奇精子细胞中的交叉蛋白MLH3共同定位.
结论:
- 介质变异I期间,CDK2经历了复杂的时间调节,涉及其异构体的差异控制和酸化.
- 抑制性 (pY15) 和激活性 (pT160) CDK2酸化的时间和定位表明它们在调节交叉事件中的作用不同.
- 这些发现为管理同类染色体交叉和分离的分子机制提供了新的见解.
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