重新分类IDUA c.250G>A (p.Gly84Ser):证据表明可能存在伪缺陷等位基因
Christopher Connolly1, Rachel Fisher1, Chen Yang1,2
1Department of Pediatrics, Division of Pediatric Genetics, University of Michigan, 1500 E Medical Center Drive, Ann Arbor, MI 48109, USA.
International journal of neonatal screening
|November 24, 2025
概括
尽管酶活性较低,但IDUA基因变异c.250G>A (p.Gly84Ser) 在新生儿中不会引起I型多糖菌症症状. 这一发现有助于防止不必要的干预和假阳性新生儿查结果.
科学领域:
- 遗传学 遗传学 是一个
- 生物化学 生物化学
- 新生儿查 新生儿查
背景情况:
- 准确的变种分类对于新生儿查 (NBS) 至关重要,以避免误诊.
- IDUA基因变异c.250G>A (p.Gly84Ser) 对I型粘多糖症 (MPS I) 的致病性报告存在矛盾.
研究的目的:
- 为了澄清IDUA基因变异c.250G>A (p.Gly84Ser) 的临床意义.
- 通过NBS识别的同卵性个体中评估IDUA变异的致病性.
主要方法:
- 针对IDUA c.250G>A (p.Gly84Ser) 变异的三个人同卵同胞的病例系列.
- 分析alpha-iduronidase (IDUA) 酶活性和葡萄糖氨基酸糖 (GAG) 水平.
- 临床随访患者年龄在3.5岁以下.
主要成果:
- 所有患者都表现出低IDUA酶活性,但正常或轻微升高的GAG.
- 在随访期间,没有患者出现MPS I的临床特征.
- 功能和人口数据表明,这种变种的伪缺陷效应.
结论:
- 对于IDUA c.250G>A (p.Gly84Ser) 变体的同胞性不会引起MPS I症状.
- 这种变异可能代表伪缺陷等位基因,在NBS解释中需要谨慎.
- 避免不必要的干预减少了心理社会和经济负担,特别是对于南亚人口.
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