HMG-CoA合成-2 缺乏:新生儿高血性昏迷和异常的代谢查类似糖尿病
Hathaipat Vaseenon1,2, Thipwimol Tim-Aroon1, Vitchayaporn Emarach Saengow3
1Division of Medical Genetics, Department of Pediatrics, Faculty of Medicine Ramathibodi Hospital Mahidol University Bangkok Thailand.
JIMD reports
|June 23, 2025
概括
线粒体HMG-CoA合成酶-2 (HMGCS2) 缺乏症可以出现严重的超氨血症,模仿其他代谢障碍. 早期诊断和管理,包括避免禁食,对于预防受影响个体的急性脱补偿至关重要.
科学领域:
- 生物化学 生物化学
- 遗传学 是一个遗传学.
- 儿科代谢 儿科代谢
背景情况:
- 线粒体HMG-CoA合成酶-2 (HMGCS2) 缺乏症是一种罕见的代谢障碍.
- 它通常在儿童早期出现hypoketotic低血糖症,代谢性酸症,肝壮症和脑病变.
- 之前的报道显示,全球约有50例病例.
研究的目的:
- 描述两个新的HMGCS2缺陷病例,包括一个严重的新生儿表现.
- 突出HMGCS2缺乏的诊断挑战和扩大的临床谱.
- 强调早期干预和管理策略的重要性.
主要方法:
- 两个患有HMGCS2缺乏症的患者的临床病例描述.
- 生物化学查包括血液氨基酸和尿液有机酸.
- 为识别遗传变异进行外体序列测序 (同胞性c.1502G>C,p.Arg501Pro变异在HMGCS2).
主要成果:
- 患者1在新生儿时呈现出败血症症状,昏迷,代谢性酸和严重的超血症 (1081μmol/L),最初类似于糖尿病 (MSUD).
- 基因分析显示了一个同卵性HMGCS2变体 (c.1502G>C,p.Arg501Pro).
- 两位患者均表现出二糖酸性尿症和禁食后增加的4-基-6-甲基-2-皮龙 (4-HMP) 排泄,这表明即使在无症状个体中也可能出现脱补偿.
结论:
- 在新生儿中,HMGCS2 缺乏症可能会出现严重的超血症,扩大其已知的表型.
- 高分支链氨基酸和特定的有机酸样本可以在触媒状态下模仿MSUD.
- 建议对受影响个体进行预防性管理,包括避免禁食和使用L-卡尼丁,以防止急性去补偿.
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