重写调节性DNA以剖析和重编程基因表达
Gabriella E Martyn1,2, Michael T Montgomery1,2, Hank Jones1,2
1Department of Genetics, Stanford University School of Medicine, Stanford, CA, USA.
一种名为Variant-FlowFISH的新方法精确编辑调节DNA,并量化基因表达变化. 这种强大的工具绘制了变异效应,改善了基因调节模型,并使得DNA序列的重编程成为可能.
科学领域:
- 基因组学就是基因组学.
- 分子生物学分子生物学
- 系统生物学 系统生物学
背景情况:
- 调节性DNA元素,如增强剂和促进剂,通过转录因子结合来控制细胞特异性基因表达.
- 由于缺乏可扩展的编辑和量化方法,预测和绘制DNA序列的精确调节效应是具有挑战性的.
- 了解这些调节机制对于破译基因表达模式和疾病病理至关重要.
研究的目的:
- 开发和验证一种可扩展的方法,用于精确编辑调节性DNA并量化其对基因表达的影响.
- 研究设计的DNA序列变异对免疫细胞中PPIF基因表达的影响.
- 用实验数据对基因调节的计算模型进行基准测试和改进.
主要方法:
- 开发了variant-FlowFISH,将聚合的CRISPR原始编辑与RNA光 in situ杂交和细胞分类相结合.
- 应用变体-FlowFISH在两个免疫细胞系中的PPIF基因增强剂和促进剂中的调节序列进行突变和重写.
- 设计并测试了数百种DNA序列变异,以绘制它们对基因表达的定量影响.
主要成果:
- 在672个变异细胞类型对中,鉴定出497个显著影响PPIF基因表达的变异细胞类型对.
- 观察到单个转录因子结合部位的破坏会导致显著的表达变化 (高达-50%).
- 证明了细胞类型特定的变异效应,并发现现有的预测模型与某些变异类型作斗争.
结论:
- 变体-FlowFISH是一种强大的工具,用于绘制调节性DNA变体效应和转录因子结合部位的地图.
- 这项研究为改善基因调节的计算模型提供了有价值的数据.
- 该方法使调节性DNA序列的合理设计和重新编程能够针对特定的基因表达结果.
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