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揭开 +33 C>G [HBB:c.-18C>G] 变异的复杂性在贝塔血病中

Coralea Stephanou¹, Miranda Petrou¹, Petros Kountouris¹

¹Molecular Genetics Thalassemia Department, The Cyprus Institute of Neurology and Genetics, Nicosia 2371, Cyprus.

|February 24, 2024

概括

在β-环球蛋白基因中的+33C>G变异单独是无声的,但会导致具有严重等位基因的中等等位基因. 这项研究描述了其在塞浦路斯的表型,有助于人口查和诊断.

科学领域:

遗传学遗传学是一个
分子生物学分子生物学
血液学血液学血液学

背景情况:

在β-环球蛋白基因的5' UTR中,+33 C>G变异 (NM_000518.5(HBB):c.-18C>G) 在其致病性方面有相互矛盾的报道.
它的临床意义,特别是在地中海人群中患有高β-血病的流行率,需要进一步研究.

研究的目的:

在异合体和复合异合体状态下广泛表型 +33 C>G 变体.
用计算预测器评估变异对临床严重性的影响.
了解变体在β-thalassemia表型中的作用.

主要方法:

桑格测序,差距PCR和限制酶消化用于基因型识别.
26个异合体和11个复合异合体病例的表型特征.
使用计算预测器 (CADD,RegulomeDB) 进行病原性评估.

主要成果:

+33°C>G的异合状态呈现出一种无声的表型,没有微细胞分裂或低染色.
带有β+或β0等位基因的复合异性导致了一系列的临床表型,包括中等血症.
在塞浦路斯发现了新的病例,有助于了解这种变种的流行率.

结论:

+33 C>G 变异的致病性取决于上下文,单独沉默,但与严重β-thalassemia等位基因共同遗传时具有临床意义.
对于地中海地区,特别是塞浦路斯的人口查和产前诊断,对这种变异的认识至关重要.
为了最终的致病性分类,需要对更多病例进行进一步的研究和共同分离数据.

关键词:

5′UTR 5′UTR是指UTR的时间.HBB HBB 在线观看基因型/表型相关性相关性沉默的变种是一种沉默的变种.乙-血症中介性

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