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Updated: May 5, 2026

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临床和分子遗传分析与甲基马龙酸性血结合 homocystinuria

Xinhui Gan, Yanhua Guo, Jie Shen

Clinical laboratory

|February 12, 2024

概括

这项研究确定了MMACHC基因中的复合异构基因突变,c.609G>A (p.W203X) 和c.467G>A (p.G156D),在一个家族中引起cblC疾病. 这些遗传变化对受影响的个体具有显著的病原性影响.

科学领域:

遗传学是一个遗传学.
生物化学生物化学
儿科儿科儿科

背景情况:

甲基马龙酸血 (MMA) 与同胞性尿素尿,cblC类型 (cblC疾病),是一种严重的代谢障碍.
对于cblC疾病来说,MMACHC基因至关重要,c.609G>A (p.W203X) 是已知的突变部位.
在MMACHC中c.467G>A (p.G156D) 突变以前没有在cblC疾病的家庭中报告过.

研究的目的:

对一家受cblC疾病影响的家庭进行临床和分子遗传分析.
为了调查cblC疾病的遗传基础,在一个家族,以前没有报告的突变.

主要方法:

新生儿查使用乙卡尼丁光谱分析 (LC-MS/MS).
通过检测尿液中的有机酸和同型半氨酸 (GC-MS) 证实了诊断.
在五个家族成员中对MMACHC基因的第二代基因测序.

主要成果:

这一家庭表现出自体逆向遗传.
两名兄弟姐妹被诊断出患有cblC疾病,携带复合异构基因突变:c.609G>A (p.W203X) 和c.467G>A (p.G156D) 在MMACHC基因中.
试验者去世了,而受影响的妹妹接受了持续的治疗. 父母和另一个兄弟姐妹是表型正常的载体.

结论:

在MMACHC中,复合异基突变c.609G>A (p.W203X) 和c.467G>A (p.G156D) 是cblC疾病的致病原因.
这一发现扩大了与cblC疾病相关的已知MMACHC突变的范围.

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