超保守的非编码元素和人类基因组中的二核酸排列中深刻的非随机性
Larisa Fedorova1, Emily R Crossley2, Oleh A Mulyar1
1CRI Genetics LLC, Santa Monica, CA 90404, USA.
Biology
|August 26, 2023
概括
超保存的非编码元素 (UCNEs) 显示出独特的二核酸排列,与一般基因组显著不同. 这些独特的模式,保存了数百万年,表明UCNEs内专门的DNA结构.
科学领域:
- 基因组学就是基因组学.
- 进化生物学 进化生物学
- 生物信息学是一种生物信息学.
背景情况:
- 长期人类超保存的非编码元素 (UCNEs) 缺乏序列相似性,这就提出了关于它们的进化稳定性的问题.
- 在UCNEs的基因组组成和排列仍然在很大程度上未被探索.
- 了解UCNEs对于破译脊椎动物进化中保存的调节元素至关重要.
研究的目的:
- 与基因组的其余部分相比,研究UCNEs具有独特的二核酸 (DN) 组成和安排的假设.
- 识别UCNE内DN间距的特定模式,并评估它们的进化保存.
- 探索这些模式对DNA结构和功能的潜在影响.
主要方法:
- 对4272个人类UCNE序列的计算分析.
- 用人类,,斑马鱼和的整个基因组进行比较分析.
- 统计评估UCNE和更广泛的人类基因组内的二核酸间隔安排中的非随机性.
主要成果:
- 在人类基因组中检测到二核酸间隔安排的显著非随机性.
- 与非UCNE基因组区域相比,UCNE具有不同的二核酸排列模式.
- 大约83%的UCNE中的二核酸对在短距离 (2-6核酸) 上显示出显著的非随机安排.
- 与预期值相比,二核酸间距的偏差高达40%,特别是涉及GpC,CpG,ApT和GpG/CpC二核酸.
结论:
- UCNEs具有独特且非随机的二核酸排列,使其与一般基因组区别开来.
- 这些独特的图案在脊椎动物中保存了数亿年的时间.
- 在二核酸排列中观察到的特殊性表明,UCNEs可能采用特定的DNA形状,可能影响其功能和稳定性.
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