自主转位子调整它们的序列以确保体性抑制
İbrahim Avşar Ilık1, Petar Glažar1, Kevin Tse2
1Otto Warburg Laboratories, Max Planck Institute for Molecular Genetics, Berlin, Germany.
Nature
|February 14, 2024
概括
SAFB 蛋白质防止可转移元素 (TE) 集成到基因组中,并通过抑制 TE 脱离来保持拼接完整性. 这种基于RNA的防御补充了生殖线路,保护体细胞免受TE的侵害.
科学领域:
- 遗传学
- 分子生物学
- 表观遗传学
背景情况:
- 可转移元素 (TE) 占据了基因组的重要部分,包括人体内基因.
- 在转录过程中,TEs通常会被分离和降解,但可能会导致分离错误,如外电化.
- 一个强大的拼接代码通常可以防止 TE 脱离,但其机制尚未完全理解.
研究的目的:
- 研究SAFB蛋白在基因组完整性和拼接中的作用.
- 了解SAFB蛋白质如何防止可转移元素 (TE) 脱离.
- 阐明SAFB蛋白对各种重复元素的更广泛的抑制活性.
主要方法:
- 研究了SAFB蛋白与L1元素序列的结合.
- 评估了SAFB对含有TEs的内子的拼接的影响.
- 研究SAFB对不同类型的TEs和基因组元素的抑制作用.
- 在体细胞和生殖细胞 (丸) 中比较SAFB表达和活性.
主要成果:
- 在L1元素中,SAFB蛋白与富含腺的序列结合,防止逆转换和TE脱离.
- SAFB的抑制功能扩展到磁带外子,嵌套基因,DNA转位子和活跃的LTR/ERV元素.
- 在体细胞中被SAFB抑制的剪接事件在丸中被重新激活,与精子体中低水平的SAFB相关.
- SAFB作为基因组中的基于RNA的防御系统,与生殖基因组的Piwi相互作用RNA通路不同.
结论:
- SAFB 蛋白质通过抑制 TE 活性和保持拼接忠实性,在保护基因组完整性方面发挥关键的双重作用.
- SAFB的机制涉及直接绑定到保存的 TE 序列,突出了以模式为导向的防御策略.
- SAFB代表了对TEs的体质,非适应性RNA防御,补充了适应性生殖基RNAi途径.
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