在一个有多名癌症患者的家庭中,有两种明显的有害因果变异
Erfan Khorram1, Mohammad A Tabatabaiefar1,2, Mehrdad Zeinalian1
1Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran.
Advanced biomedical research
|September 11, 2023
概括
整体外基因组测序确定了两种致病变体,CHEK2 c.538C>T和MLH1 c.844G>A,在一个患有遗传性癌症的伊朗家庭中. 这些变种一起解释了家族的家族性.
科学领域:
- 遗传学 是一个遗传学.
- 在瘤学瘤学.
- 分子生物学分子生物学
背景情况:
- 遗传性癌症虽然罕见 (占所有癌症的5-10%),但由于生殖系传播,存在重大风险.
- 目前用于遗传性癌症的查方法缺乏最佳的特异性和敏感性.
- 全外体测序 (WES) 提供了增强的诊断能力,用于识别风险家庭的癌症易感变异.
研究的目的:
- 通过全外因子测序,识别伊朗一家具有多种癌症病史的致病性遗传变异.
- 用in silico和共同分离分析评估已识别变异的致病性和结构/功能影响.
主要方法:
- 在试验对象的DNA上进行了全外体测序 (WES).
- 使用in silico工具来预测变异性病原性和对蛋白质结构,功能和稳定性的影响.
- 桑格测序用于家族内候选变异的共同分离分析.
主要成果:
- 在WES中发现了两种致病变体:CHEK2 c.538C>T (p.Arg180Cys) 和MLH1 c.844G>A (p.Ala282Thr).
- 结构分析显示,CHEK2 c.538C>T 破坏了一个关键的盐桥.
- 预计这两种变异都会对各自的蛋白质造成不稳定,它们一起解释了观察到的癌症表型.
结论:
- 在一个多种癌症影响的家庭中,发现了两种不同的有害变体,CHEK2 c.538C>T和MLH1 c.844G>A.
- 这项研究强调了整个外体序列测序在遗传性癌症病例中的基因诊断的有效性.
- 对变异及其结构影响的综合分析对于理解复杂的遗传性癌症综合征至关重要.
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