用先进的长读测序方法破译人类神经视网膜中最大的与疾病相关的转录异型
Merel Stemerdink1,2, Tabea Riepe3,4, Nick Zomer4
1Department of Otorhinolaryngology, Radboud University Medical Center, Nijmegen 6525 GA, The Netherlands.
Genome research
|March 4, 2025
概括
研究人员克服了对阿舍尔综合征的大型转录的测序限制,阿舍尔综合征是遗传性视网膜疾病的主要原因. 他们成功地捕获和测序了全长的与疾病相关的转录,使得新的异型发现成为可能.
科学领域:
- 基因组学和转录基因组学
- 眼科和视觉科学 眼科和视觉科学
- 分子生物学分子生物学
背景情况:
- 从历史上看,测序技术一直在努力全面分析大型转录,特别是那些与遗传性视网膜疾病 (IRD) 相关的转录.
- 阿舍尔综合征是IRD的主要原因,涉及11个基因,转录的长度高达19.6kb,对全长测序构成重大挑战.
- 现有的PacBio长时间读取的mRNA异形测序 (Iso-Seq) 工作流程与标准丰富不足以捕获最长的阿舍尔综合征转录.
研究的目的:
- 开发和优化一种方法来丰富和测序与阿舍尔综合征和其他IRD相关的长记录.
- 在阿舍尔综合征相关基因中识别新型转录异型和替代拼接事件.
- 为了证明Samplix Xdrop系统在捕获长cDNA目标方面的实用性.
主要方法:
- 在人类神经视网膜样本上利用PacBio长时间读取的Iso-Seq.
- 实现了一个优化的工作流程,以长时间丰富转录.
- 采用Samplix Xdrop系统对cDNA进行间接向丰富,以捕获以前无法访问的长转录 (例如USH2A,ADGRV1).
主要成果:
- 成功捕获和测序了阿舍尔综合征相关基因的全长转录,包括18.9 kb USH2A和19.6 kb ADGRV1.
- 通过算法分析和手动策划识别了新的转录异型,揭示了替代的5'起点点,未注释的外型和替代的拼接事件.
- 证明了Samplix Xdrop系统对cDNA丰富的有效性,并将其应用范围扩展到基因组DNA之外.
结论:
- 优化的工作流和Samplix Xdrop系统使得像阿舍尔综合征这样的IRD中大型基因的综合转录基因分析成为可能.
- 新型异构体的发现为推进遗传诊断和开发针对遗传视网膜疾病的向治疗提供了关键的见解.
- 描述的方法可适应丰富来自不同组织的大型转录,促进更广泛的转录基因研究.
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