对一种新型FBN1深层内源变异的功能分析,该变异在中国患者中引起马凡综合征
Qingming Wang1, Fang Zhang1, Xinlong Zhou1
1Key Laboratory for Precision Diagnosis and Treatment of Severe Infectious Diseases in Children, Dongguan Maternal and Child Health Hospital, Dongguan, China.
Frontiers in genetics
|April 3, 2025
概括
在Marfan综合征患者中发现了FBN1基因中的新型深层内基因变异,扩大了已知的FBN1突变谱. 这一发现凸显了解释内基变异对于准确的分子诊断的重要性.
科学领域:
- 遗传学和分子生物学
- 医学遗传学 医学遗传学
- 结合组织疾病 结合组织疾病
背景情况:
- 马凡综合征 (MFS) 是一种由FBN1基因变异引起的自体主导性疾病,影响骨,心血管和眼睛系统.
- 尽管报告了3000多例MFS病例和1800个确定的FBN1变种,但对8-10%的患者来说,分子诊断仍然具有挑战性.
- 深层内部变异越来越多地被认为是遗传疾病的原因,但需要专门的解释.
研究的目的:
- 通过标准方法,研究马方综合征的遗传原因,在患有暗示性临床特征但没有可识别的致病变体的患者中.
- 在FBN1基因中识别和功能性地表征一种新型的深层内突变.
- 为了确定已识别的变种的基因型-表型相关性.
主要方法:
- 进行了全外体测序 (WES) 来识别遗传变异.
- 在FBN1的40号内突中发现了一种新的深层内突变 (c.4943-8_4943-7insTATGTGATTCAT TCAC).
- 进行了微基因分析,以评估变异对RNA剪接的影响.
主要成果:
- 确定的深层内基变异被证实会导致FBN1基因中41号外基因的跳转.
- 这种拼接缺陷导致41个氨基酸的删除 (p.Val1649_Asp1689del),证实了其致病性质.
- 该研究确定了报告患者中这种新型变异的基因型-表型关系.
结论:
- 这项研究发现了一种新型的致病性深层内基FBN1变体,扩大了导致马凡综合征的已知突变谱.
- 这些发现强调了解释深层内源变异和进行功能研究对于MFS精确分子诊断至关重要.
- 这项研究强调了对具有挑战性的马尔凡综合征病例需要进行全面的遗传分析,包括深层内部区域.
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