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早期发生的大动脉解剖:在MYH11基因中表征一种新的致病拼接变异,该基因具有多个框架内异常转录

Pauline Arnaud^1,2, Margaux Cadenet¹, Zakaria Mougin²

¹Département de Génétique, AP-HP, Hôpital Bichat, F-75018 Paris, France.

|April 14, 2025

概括

罕见的MYH11基因变异导致大动脉剖析. 一个在患有大动脉剖析的年轻患者中发现的新型拼接部位变异被证实是致病的,这凸显了在MYH11变异解释中需要详细拼接分析的需要.

科学领域:

遗传学和分子生物学
心血管病理学心血管病理学

背景情况:

MYH11基因中的致病变体与胸前大动脉动脉瘤和剖析有关,通常是异合的误解变体或框架内删除.
了解MYH11基因变异的生理病理机制至关重要,因为未知意义的变异很常见.
之前的研究发现了与不同遗传模式相关的不同表型 (大囊-微结肠-肠道低性综合征的自体递归).

研究的目的:

为了研究一种新型MYH11基因变异的致病性,该变异在患有大动脉剖析的年轻患者中被发现.
为了阐明 MYH11.11 拼接部位变异的分子后果.
为了强调对未知意义的MYH11变体进行详细拼接分析的重要性.

主要方法:

在MYH11基因中识别了影响共识供体结合部位的变体,即MYH11基因中的外显子29的变体.
在培养的纤维细胞上进行转录分析,以确定异常的转录.
家庭查以确定已识别的变种的遗传模式.

主要成果:

一名23岁时出现大动脉A型剖析的患者携带了MYH11基因的新变异,影响了exon 29拼接部位.
转录分析揭示了异常的拼接,包括两个框架内转录:一个是从外显子29删除了78个核酸,另一个是从外显子29跳过.
鉴定出的变种根据临床表现,分子分析和家族查被归类为致病性.

结论:

这一病例证实了MYH11中一种与胸前大动脉剖析相关的新型致病拼接位变异.
该研究强调了拼接变化的关键作用在MYH11相关的大动脉疾病的发病.
系统地调查拼接后果对于准确解释MYH11变种至关重要.

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