备份转录因子结合部位保护人类基因免受促进因子突变的影响
1Department of Microbiology, Immunology and Cancer Biology, University of Virginia School of Medicine, Charlottesville, Virginia, United States of America.
PloS one
|August 31, 2023
概括
人类基因调节区域通过冗余的转录因子/结合位点对抵抗突变. 这些丰富的对确保了基因表达的稳定性,在大脑和肝脏组织中发现了特定的部位.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- 基因表达对细胞功能至关重要.
- 调节区域的突变可以破坏基因表达.
- 了解基因调节的强度至关重要.
研究的目的:
- 为了调查人类基因调节区域是否在进化过程中被设计为抵抗影响基因表达的突变.
- 测试丰富的转录因子/转录因子结合位点 (TF/TFBS) 对提供冗余性和稳定性的假设.
- 为了比较脑特异性和肝特异性基因中的TF/TFBS特征.
主要方法:
- 在42个人类大脑特异性基因中确定了五个最丰富的TF/TFBS对.
- 使用ChIP-seq信号测量了TF/TFBS占用率.
- 分析了基因表达控制的TF/TFBS可替代性.
- 对31个人类肝脏特异性基因进行了并行分析.
- 在脑和肝脏特定基因组之间比较TFBS谱.
主要成果:
- ChIP-seq信号表明,TF/TFBS对可以在脑特异性基因中相互替代.
- 在肝脏特异性基因中观察到类似的可替代性,支持突变抗性.
- 在脑特异性基因 (58) 和肝特异性基因 (8),与23个共享基因相比,在脑特异性基因中发现了大量独特的TFBSs.
- 特定于大脑的基因表现出更多的TFBSs.
结论:
- 人类基因调节区域通过冗余的TF/TFBS机制表现出对突变的强度.
- TF/TFBS对表现出功能冗余,确保基因表达的稳定性.
- 大脑和肝脏特定基因之间存在着不同的TFBS景观,大脑基因显示出更大的复杂性.
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