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鉴定一种新型SNP突变,导致脱落等位基因在一个父性测试使用结合巢和触摸下降PCR与桑格测序的鉴定

Hongbo Wang^1,2,3, Botong Shi⁴, Liang Guo⁴

¹Department of Human Anatomy, School of Basic Medicine, Shenyang Medical College, Shenyang, P.R. China.

Annals of human biology

|November 4, 2024

概括

在SE33位点的新型G>T突变导致父亲和儿子对中的短串重复 (STR) 脱落等位基因,可能导致错误的非父性结论. 这一发现影响了法医DNA分析和数据库构建.

科学领域:

法医遗传学法医遗传学
分子生物学分子生物学
人口遗传学人口遗传学

背景情况:

短串重复 (STR) 标记器对于自动化和标准化法医DNA类型化至关重要.
不准确的STR类型可能会显著影响法医病例的结果.
在特定的STR位点的等位体脱落可能导致错误的结论,例如错误的非父性.

研究的目的:

为了调查SE33位点的等位体脱落的原因,在一个假定的父子对中.
为了识别影响STR类型准确性的新突变.
评估相关人群中发现突变的频率.

主要方法:

使用MicroreaderTM 28A识别系统检测SE33位点的脱落等位基因.
开发一个嵌套和触摸PCR程序,用于Sanger测序SE33位点.
在300个无亲属个体的突变频率分析和对429个父亲测试结果的审查.

主要成果:

在SE33位点的原始结合区域中发现了一种新奇而罕见的G>T单核酸突变.
这种突变存在于假设的父子对的两个样本中,并对观察到的脱落等位基因负责.
在中国人群中,这种G>T突变的频率低于0.01.

结论:

鉴定到的G>T突变是导致SE33位点的基脱落的一个重要因素.
这些发现需要优化法医STR套件中的原料设计,以解释这种罕见的突变.
精确的DNA数据库构建需要考虑特定于种群的单核酸变异.

关键词:

脱落的等位基因法医遗传学法医遗传学在SE33的位置.在SNP中发生突变.

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