逃脱但不活跃的X链蛋白复杂编码基因可以实现X染色体剂量补偿,并成为X染色体不活化相关疾病的基础
Zhihao Xing1,2, Yuchao Zhang2, Zhongyuan Tian3
1Clinical Laboratory, Institute of Pediatrics, Shenzhen Children's' Hospital, Shenzhen, China.
Heliyon
|July 14, 2023
概括
X染色体剂量补偿实现了基因表达等价性. 活跃X染色体上的脱离蛋白质复合基因 (EsP) 显示出更高的表达,这表明它们驱动了这个过程,可能与疾病有关.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- X染色体剂量补偿 (XDC) 在两性之间均等化X相关基因表达.
- 奥诺的假设表明,XDC涉及女性的基因上调和X染色体失活 (XCI).
- 对于XDC上调调节的特定基因和机制仍然不清楚.
研究的目的:
- 调查哪些X链基因是XDC的上调调节.
- 确定XDC上调背后的机制,重点关注蛋白质编码基因 (PCG).
- 探索这些基因的进化和功能影响.
主要方法:
- 对人类X链基因表达的比较分析.
- 识别脱离XCI的基因 (EsP) 与失活的基因 (InP).
- 对基因表达水平,选择压力 (dN/dS比) 和转录因子丰富 (SP1) 的分析.
主要成果:
- 蛋白质编码基因 (PCG) 更有可能逃脱XCI.
- 逃脱PCG (EsP) 的RNA和蛋白质表达率是InP或其他X链基因的两倍.
- 埃斯皮表达很可能是活性X染色体 (Xa) 上调的结果,而不是从非活性X (Xi) 逃脱.
- EsP基因表现出高表达,低dN/dS比,以及SP1转录因子的丰富.
- EsP基因与类似收费受体,NF-kB,细胞缩和精神/发育/生殖途径异常相关.
结论:
- 活跃X染色体上的ESP是通过上调实现XDC的关键.
- SP1可能会调节ESP上调.
- 错误的ESP调节与自身免疫,生殖和神经系统疾病有关.
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