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Robin A Pilz¹, Matthias Begemann², Surema Pfister³

¹Department of Human Genetics, University Medicine Greifswald and Interfaculty Institute of Genetics and Functional Genomics, University of Greifswald, Greifswald, Germany. RobinAlexander.Pilz@med.uni-greifswald.de.

|August 28, 2025

概括

在家族性脑洞形 (FCCM) 中检测复杂的基因突变是困难的. 全基因组测序发现了一种新的致病基因KRIT1变异,使FCCM家族的预测测试成为可能.

科学领域:

遗传学
分子生物学
神经学

背景情况:

家族性脑洞形 (FCCM) 是一种遗传性疾病,其特征是大脑血管发育异常.
由于复杂的基因突变, 诊断FCCM可能具有挑战性,
克里特1基因是FCCM发病的一个关键因素.

研究的目的:

在具有强烈临床怀疑但先前遗传检测负面的患者中调查FCCM的遗传基础.
确定有助于FCCM的新型结构变体.
评估全基因组测序 (WGS) 作为FCCM的二线诊断工具的实用性.

主要方法:

在FCCM患者身上进行了全基因组测序 (WGS).
使用生物信息分析检测结构变异.
鉴定出的变异对基因功能的影响进行了分析,并根据致病性进行了分类.

主要成果:

发现了一种大型的新型结构变异:KRIT1基因的编码外基因被插入了内基KRIT1片段.
这种插入导致KRIT1基因内的移突变.
鉴定的变种被归类为致病性,解释了患者的FCCM诊断.

结论:

这一案例突显了FCCM的一个新型致病机制,涉及KRIT1基因的复杂结构变异.
全基因组测序是诊断FCCM的有价值的工具,当外体或基因组测序产生负面结果时.
这种变异的鉴定允许在有风险的家庭成员中进行预测性遗传测试.

关键词:

大脑洞形形插入结构变体全基因组测序

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