鼠标转移稳定的类基因是极其罕见的
Chathura J Gunasekara1, Uditha Maduranga1, Taylor Zhang1
1USDA/ARS Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX, 77030, United States.
Nucleic acids research
|July 22, 2025
概括
转基因稳定性位 (MES) 是一种罕见的基因组位点,在小鼠中具有随机表观遗传标记. 这项研究在全基因组中仅发现了29个ME,这表明对同源个体的表型变异的影响有限.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 基因组学就是基因组学.
- 发展生物学 发展生物学
背景情况:
- 转基因稳定位 (ME) 是基因组区域,在早期发育过程中建立了表观遗传标记的基因位点.
- 这些标记被稳定地维持,导致基因相同个体的表观遗传和表型变异.
- 在小鼠中MEs的全基因组流行率和特征在很大程度上仍然没有特征.
研究的目的:
- 在小鼠中进行第一个对转基因稳定性基单元 (ME) 的无偏见的全基因组选.
- 描述ME的基因组位置,频率和潜在的调节因素.
- 调查母亲的饮食和性对ME甲基化模式的影响.
主要方法:
- 从同位素C57BL/6J小鼠的多种组织中进行深度全基因组双硫酸盐测序.
- 在老鼠基因组中识别和精确定位ME.
- 分析ME与可转移元素的关联以及性别特定的甲基化模式.
主要成果:
- 在全基因组范围内只识别了29个转移稳定的类基因 (ME),突出显示了它们的稀有性.
- 没有发现母体甲基供体补充对ME甲基化有任何影响,这挑战了以前的可塑性概念.
- 大多数ME与内A粒子 (IAP) 元素的5'端有关.
- 在发生性分化之前的自身体区域中发现了与性别相关的DNA甲基化变异.
- 将ME甲基化与转录因子如CTCF和KRAB指蛋白的表达联系在一起.
结论:
- 在小鼠基因组中,转基因稳定性基因 (ME) 是罕见的,不太可能是同位基因小鼠表型变异的主要驱动因素.
- 母亲的饮食似乎不会影响ME甲基化,这与之前的一些建议相反.
- 早期发育期间的转录因子活性对于在ME中建立和维持DNA甲基化至关重要,特别是与可转移元素相关的ME.
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