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通过全基因组测序,在患有Diamond-Blackfan贫血综合征的患者中发现了2种新的非编码变异

Ting Wen^1,2,3, Steven E Boyden⁴, Caleb M Hocutt^5,6

¹ARUP Laboratories, Salt Lake City, UT.

|March 3, 2025

概括

这项研究在钻石-布莱克芬贫血综合征 (DBAS) 病例中发现了RPS7和RPS19基因中的新型非编码变异,突出了全基因组测序.

科学领域:

遗传学是一个遗传学.
血液学血液学血液学
罕见疾病罕见疾病

背景情况:

钻石-布莱克芬贫血综合征 (DBAS) 是一种罕见的先天性疾病,导致纯红细胞无形成.
DBAS在遗传上是异质的,有20多个已知的相关基因.
以前的基因测试,包括外体测序,在两个DBAS病例中未能识别致病变体.

研究的目的:

在两个以前未被诊断的病例中确定DBAS的遗传原因.
研究全基因组测序 (WGS) 对于诊断罕见遗传疾病的有用性.

主要方法:

重新分析临床全基因组测序 (WGS) 数据.
在RPS7和RPS19.9中识别和描述新型非编码变异.
使用RNA测序的功能分析.
在家庭成员中进行级联测试.
血造干细胞移植在一个病人身上.

主要成果:

确定了两个新的非编码变体:RPS7中的一个拼接变体和RPS19.19中的一个深层内部变体.
这些变体被证明具有有害的功能后果.
级联测试证实了RPS7变体在受影响的母亲亲属中具有可变性贫血.
血造干细胞移植成功治疗了一名患者的先天性贫血.

结论:

在RPS基因中的新型非编码变异可以导致钻石-布莱克芬贫血综合征.
全基因组测序 (WGS) 对于诊断罕见的遗传疾病至关重要,特别是当标准测试失败时.
早期诊断和治疗,包括移植,可以改善患者的结果.

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