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探讨非规范剪接位点变异在与生殖遗传障碍相关的异常剪接中的作用。

Exploring the role of non-canonical splice site variants in aberrant splicing associated with reproductive genetic disorders.

机构信息

IVF Center, Department of Obstetrics and Gynecology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China.

Guangdong Provincial Clinical Research Center for Obstetrical and Gynecological Diseases, Guangzhou, China.

出版信息

Clin Genet. 2024 Dec;106(6):750-756. doi: 10.1111/cge.14604. Epub 2024 Aug 5.

Abstract

Whole-exome sequencing (WES) is frequently utilized in diagnosing reproductive genetic disorders to identify various genetic variants. Canonical ±1,2 splice sites are typically considered highly pathogenic, while variants at the 5' or 3' ends of exon boundaries are often considered synonymous or missense variants, with their potential impact on abnormal gene splicing frequently overlooked. In this study, we identified five variants located at the last two bases of the exons and two canonical splicing variants in five distinct families affected by reproductive genetic disorders through WES. Minigene analysis, RT-PCR and Quantitative Real-time PCR (RT-qPCR) confirmed that all seven variants induced aberrant splicing, with six variants altering gene transcriptional expression levels. These findings underscore the crucial role of splice variants, particularly non-canonical splice sites variants, in reproductive genetic disorders, with all identified variants classified as pathogenic.

摘要

全外显子测序(WES)常用于诊断生殖遗传疾病,以识别各种遗传变异。通常认为经典的±1,2 剪接位点高度致病,而外显子边界 5'或 3'末端的变异通常被认为是同义或错义变异,其对异常基因剪接的潜在影响经常被忽视。在这项研究中,我们通过 WES 在五个受生殖遗传疾病影响的不同家族中发现了五个位于外显子最后两个碱基的变异和两个经典剪接变异。通过微基因分析、RT-PCR 和实时定量 PCR(RT-qPCR)证实,这七个变异均导致异常剪接,其中六个变异改变了基因转录表达水平。这些发现强调了剪接变异,特别是非经典剪接位点变异,在生殖遗传疾病中的关键作用,所有鉴定的变异均被归类为致病性变异。

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