对TAD的进化和功能表征揭示了哺乳动物TAD边界属性和功能中的多样性
Mariam Okhovat1, Jake VanCampen2, Kimberly A Nevonen2
1Department of Medicine, Knight Cardiovascular Institute, Oregon Health and Science University, Portland, OR, USA. okhovat@ohsu.edu.
Nature communications
|December 7, 2023
概括
拓关联域 (TADs) 进化,超保守的边界显示出强大的基因调节. 特定物种的TAD边界变化影响基因表达和发育,突出了TAD进化.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 拓关联域 (TADs) 是调节基因表达的关键基因组结构.
- TADs及其边界的进化保护和功能意义以及它们的边界尚未得到充分理解.
研究的目的:
- 为了研究TAD组织在灵长类动物和动物物种的进化保护.
- 描述保存和特定物种TAD边界的遗传和表观遗传特性.
- 评估TAD边界演变对基因调节和表型的功能影响.
主要方法:
- 对八种物种 (四种灵长类动物,四种动物) 的Hi-C和ChIP-seq数据进行比较分析.
- 识别和注释超级保护和特定物种的TAD边界.
- 在小鼠模型中进行CRISPR-Cas9基因编辑,以研究边界功能.
- 基因表达变化的分析和删除后的表型结果.
主要成果:
- 人类TAD边界的14%是所有八种物种的超级保护;15%是人类特有的.
- 超保守的TAD边界表现出更大的绝缘,CTCF结合和逆转子子缩.
- 在小鼠中,超保守边界的破坏导致组织特异性的表达变化和形态缺陷.
- 在AUTS2基因附近删除人类特异性边界导致其在神经元中的上调.
结论:
- TAD边界进化是显著的,保留边界在基因组组织中发挥着关键作用.
- 特定物种的TAD边界有助于物种独特的基因调节和表型差异.
- 该研究为TAD边界提供了有价值的进化注释,并证明了它们的功能重要性.
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