致病性深层内源性PCSK1变体导致亲蛋白转化酶1/3缺乏在一个家庭
Leah M Huber1, Aslı Subaşıoğlu2,3, Dorota Garczarczyk-Asim1
1Department of Pediatrics I, Medical University of Innsbruck, Innsbruck, Austria.
Clinical genetics
|February 1, 2025
概括
对于能量恒温来说至关重要的蛋白转化酶1/3 (PC1/3) 缺乏症可能是由深层内在PCSK1变异引起的,导致异常拼接. 扩展的基因检测对于及时诊断这种多边分泌病变至关重要.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 内分泌学 在内分泌学.
背景情况:
- 由PCSK1编码的proprotein转化酶1/3 (PC1/3),对于激活参与能量平衡的蛋白质前体至关重要.
- 在PCSK1中双性功能丧失突变导致多体内分泌病变,之前报告了34名患者.
- 诊断PC1/3缺乏症可能是具有挑战性的,特别是当标准外基因组测序没有发现突变时.
研究的目的:
- 在患有先天性吸收不良腹和随后的肥胖症的婴儿中调查PC1/3缺乏症的遗传基础.
- 在初始外体组序列是负的时,识别潜在的遗传原因.
- 阐明PCSK1.1中新型深层内源变异的机制.
主要方法:
- 在一个患有吸收不良腹和肥胖症的婴儿身上进行了外体序列 (ES) 测试.
- 进行了转录分析以确定异常的PCSK1转录.
- 一种深度内源变异 (c.1196+2681T>A) 被识别并分离在家族内.
- 使用微基因测试来确认内基变异的功能影响.
主要成果:
- 外基因组测序没有显示编码区域的突变,尽管临床怀疑PC1/3缺乏.
- 转录分析发现了异常的PCSK1转录,其中包含了9号内子,导致过早停止编码.
- 发现一种深层内变异,c.1196+2681T>A,导致了9.内的伪外纳入.
- 这种变异在受影响的家庭成员中与疾病表型分离.
结论:
- 在PCSK1的深层内基变异可以通过异常拼接引起PC1/3缺乏,导致特征性的多体内基因病变.
- PC1/3 缺陷的表型可能需要扩展的基因测试超出标准的外体序列测序,以准确诊断.
- 及时诊断PC1/3缺陷至关重要,可能需要先进的遗传分析来检测影响拼接的非编码变异.
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