与BRAT1相关的疾病: 97名患者的表型谱和表型-基因型相关性
Camille Engel1, Stéphanie Valence2, Geoffroy Delplancq3
1Centre de Génétique Humaine, Centre Hospitalier Régional Universitaire, Université de Franche-Comté, Besançon, France. cengel@chu-besancon.fr.
European journal of human genetics : EJHG
|June 21, 2023
概括
在BRAT1基因的双变异导致严重的新生儿综合征或轻微的神经发育障碍. 基因型-表型相关性显示无意义/移变体与致命的RMFSL相关,而误解变体表明NEDCAS.
科学领域:
- 遗传学 遗传学 是一个
- 神经学 神经学
- 儿科 儿科 儿科
背景情况:
- BRAT1 变异与两个不同的综合征有关:刚性和多焦点发作综合征,致命新生儿 (RMFSL) 和神经发育障碍相关的大脑缩与或没有发作 (NEDCAS).
- 之前的文献报道了40名患有BRAT1相关疾病的个体.
- 这项研究将队列扩展到97个个体,从而实现了强大的表型-基因型分析.
研究的目的:
- 确定BRAT1相关疾病的临床谱和基因型-表型相关性.
- 为了分析97个具有BRAT1变异的个体的大队伍.
- 建立特定的遗传变异类型和临床结果之间的明确联系.
主要方法:
- 追溯收集和分析来自97名 BRAT1 变异个体的临床和分子数据.
- 根据临床表现,将患者分为RMFSL和NEDCAS表型.
- 基因型的相关性 (变体类型:无意义,框架转移,内框架删除/插入,误解,拼接) 与表型.
主要成果:
- 59名患者呈现了严重的RMFSL表型 (没有精神运动学习,,小头症,四肢硬,过早死亡).
- 三十八个个体呈现出非致命的NEDCAS表型 (大脑缩,轴性低血压,大脑缩,有些人实现了行走和说话).
- 双类无稽之谈,框架转移或超框架删除/插入变种仅与RMFSL (100%) 相关,而至少有一个错误变异的基因型更频繁地与NEDCAS (82%) 相关. 拼接变体显示出不同的结果.
结论:
- 与BRAT1相关的疾病中的基因型-表型相关性是显著的,特定的变异类型预测了不同的临床轨迹.
- 在BRAT1中双性功能丧失变体 (无意义,位移动,内删除/插入) 导致严重的RMFSL表型.
- 在BRAT1中,误解变异更常与较温和的NEDCAS表型相关,这凸显了遗传变异分类对于预测疾病严重性的重要性.
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