N-终端乙转移酶NAA30的无意义变异可能与全球发育迟缓和气管裂相关
Sylvia Varland1,2, Kirsten Marie Brønstad1, Stephanie J Skinner3
1Department of Biomedicine, University of Bergen, Bergen, Norway.
American journal of medical genetics. Part A
|June 30, 2023
概括
一种NAA30的遗传变异破坏了N-终端乙化,这是细胞中的一个关键过程. 这种缺陷与年轻男孩的发育迟缓和其他健康问题有关,扩大了罕见遗传疾病已知的原因.
科学领域:
- 生物化学 生物化学
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 由N-终端乙转移酶 (NATs) 进行N-终端乙化 (NTA) 是一种重要的翻译后修饰,影响了许多细胞功能.
- 包括NAA30在内的NatC复合体在高达20%的人类蛋白质组中负责NTA,通常是共同翻译的.
- 功能障碍的NAT与罕见的遗传疾病有关,这些遗传疾病的特征是发育异常和器官缺陷.
研究的目的:
- 为了调查新发现的NAA30无意义变异 (c.244C>T,p.Q82*) 的致病性,该变异在患有全球发育迟缓和其他症状的患者中被发现.
- 阐明这种NAA30变异对N端乙转移酶活性的功能后果.
- 扩大对NAT相关遗传疾病的理解.
主要方法:
- 整体外基因组测序以识别遗传变异.
- 试验室中的乙化试验用于评估突变NAA30蛋白的催化活性.
- 结构建模分析变异对蛋白质结构和功能的影响.
主要成果:
- 在NAA30中,在一个患有全球发育迟缓,自闭症谱系障碍,低血压,气管裂和复发性呼吸道感染的5岁男孩身上发现了一种新型异质合性无意义变异 (c.244C>T,p.Q82*).
- 在体外,NAA30-Q82*变体完全取消了N端乙转移酶对已知的NatC基质的活性.
- 结构建模表明,截断的NAA30变体缺乏酶功能所需的必不可少的GNAT域.
结论:
- 由于NAA30-Q82*变异的缺陷NatC介导的N端乙化可能是患者复杂表型的原因.
- 这项研究强调了NAA30在正常发育中的关键作用,并扩大了与N-终端乙转移酶功能障碍相关的遗传疾病的范围.
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