系统评估促进子近位短串联重复对表达的影响
Xuan Zhang1, Lingzhi Zhang1, Ellice Wang1
1Department of Medicine, University of California, San Diego, La Jolla, California 92093, USA.
bioRxiv : the preprint server for biology
|September 26, 2025
概括
短串联重复 (STRs) 影响基因表达,这项研究开发了一种大规模并行记者测试 (MPRA) 来揭示它们的调节机制. 我们发现,STR复制数和序列对表达有重大影响,揭示了对遗传变异和调节的新见解.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
背景情况:
- 短串重复 (STR) 的遗传变异与基因表达有关,但因果机制尚不清楚.
- 大规模并行报告员测试 (MPRA) 对测试监管活动具有强大作用,但在STR方面面临挑战.
- 了解STRs在基因调节中的作用对于破译非编码基因组至关重要.
研究的目的:
- 优化MPRA框架,研究STR拷贝数变异对基因表达的影响.
- 研究STRs影响分子表型的调节机制.
- 建立STRs作为基因调节语法的一个关键组成部分.
主要方法:
- 开发和优化基于随机条形码的MPRA来评估合成STR变体的调控活性.
- 在30516个促进者-近位STR位点上执行MPRA,对每个进行多个副本数变异的测试.
- 在表现最好的位置上进行了更深的扰动MPRA,操纵重复单元序列,方向和副本号码.
主要成果:
- 确定了1366个STR位点,其中拷贝数与基因表达有显著的关联,对积极效应有很强的丰富作用.
- 证明STR重复单元序列是副本数依赖表达式的主要决定因素,方向和侧面序列具有次要作用.
- 揭示了特定重复的非线性表达效应 (例如,AAAC/GTTT) 超过某些副本数值值,并将一些STR与DNA二次结构和R循环形成联系起来.
结论:
- STRs是非编码监管格局的关键元素,显著塑造基因表达.
- 该研究提供了一个强大的MPRA框架,用于剖析STR及其变体的监管作用.
- 这些发现强调了重复单元序列,拷贝数和DNA结构在STR介导的基因调节中的重要性.
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