人类基因组含有超过一百万个自主外显子
Nicholas Stepankiw1, Ally W H Yang1, Timothy R Hughes2,3
1Donnelly Centre, University of Toronto, Toronto, Ontario, Canada M5S 3E1.
Genome research
|November 9, 2023
概括
大多数人体外基因,包括mRNA和lncRNA,都会自主地结合. 这项研究发现了数以百万计的自主前子,许多没有注释,可能是非功能性的,解释了新的lncRNA起源.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 生物信息学是一种生物信息学.
背景情况:
- 哺乳动物的mRNA和lncRNA外子通常相对于内子来说很小.
- 子定义模型假定基于局部序列特征的自主子拼接.
- 缺少对外因子自主性和偶然外因子形成的频率的全基因组验证.
研究的目的:
- 在全基因组规模上研究人类mRNA和lncRNA外基因组的自主拼接.
- 为了偶然地确定自主外子形成的频率.
- 通过表子捕捉识别的新型,未注释的外原体的特征.
主要方法:
- 在异质转基因中捕捉大型人类基因组片段 (500-1000 bp) 的外显子.
- 检测和定义"自主"拼接的外体.
- 捕获的前子的生物信息分析,包括保存和序列特征丰富.
主要成果:
- 确定了大约125万个自主外形,包括大多数已知的mRNA和注释的lncRNA内部外形.
- 人类外原体主要是自主性的,mRNA外原体表现出最高的捕获效率.
- 发现了近一百万个未注释的外型子,主要是在基因间区域和mRNA的反意义中,缺乏保护,可能是由随机突变引起的.
- 这些新型外原体富含促进拼接的特征,并且比标注的lncRNA外原体数量更多.
结论:
- 大多数人类编码外基因表现出自主拼接.
- 这些发现解释了许多未保存的长非编码RNAs (lncRNAs) 的起源.
- 这项研究为注释可剪接位点和理解它们在人类基因组中的包含水平提供了一个新的框架.
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