在BMPR1B中,一种新型异质合体c.1024A>G变异会导致单独的甲状腺动类型A4具有可变的表达力或不完整的类型A4重叠的类型D在中国汉族的家谱中
Xinyi Yang1, Xiaqing Wu1, Hua Li2
1Department of Medical Imaging, Southwest Medical University, Luzhou, China.
American journal of medical genetics. Part A
|March 22, 2025
概括
骨动症4型 (BDA4) 和骨动症D型 (BDD) 是一种罕见的遗传性疾病. 一个新的BMPR1B基因变异被确定为BDA4和BDD的原因在一个中国家庭中,扩大了对胸椎病遗传学的知识.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 骨发育不良症 骨发育不良症
背景情况:
- 脊椎形症4型 (BDA4) 和脊椎形症D型 (BDD) 是一种罕见的自体主导性疾病,其特征是明显的手和脚形.
- 对于BDA4和BDD的遗传基础在很大程度上仍然不清楚,这阻碍了对它们的病变发生的理解.
- 之前的研究表明,BMPR1B与其他类型的支臂动有关 (BDA1,BDA2),但其在BDA4和BDD中的作用尚不清楚.
研究的目的:
- 为了调查BDA4和BDD的遗传原因,中国汉族血统呈现重叠的表型.
- 为了识别和表征与这些罕见的甲状腺症相关的新型遗传变异.
主要方法:
- 受影响的血统的临床和放射性表型.
- 整体外因子测序和桑格测序用于识别遗传变异.
- 生物信息学和结构分析,以评估变体的病原性.
- 功能性测试评估SMAD4在BMP4刺激细胞中的定位.
主要成果:
- 在BMPR1B基因中发现了一种新型异质合体c.1024A>G (p.K342E) 变异,在两个家族分支的所有受影响个体中发现.
- 生物信息学和结构分析表明,这种变异是致病性的,导致BMPR1B激酶域的结构变化.
- 功能性测试表明,突变BMPR1B表达细胞中核SMAD4积累减少,表明BMP信号受损.
- 这种变异破坏了BMPR1B激酶活性,影响了SMAD1/5/8酸化,下游IHH表达和BMP介导的骨模式.
结论:
- 这项研究提供了第一个证据,将BMPR1B突变与单独的BDA4和BDA4与BDD重叠联系起来.
- 鉴定到的BMPR1B变种 (c.1024A>G,p.K342E) 是致病性,并通过破坏BMP信号传递对观察到的表型作出贡献.
- 血统中的可变表达性可能是BMPR1B变种与遗传背景和环境因素的相互作用的结果.
- BMPR1B被认为是甲虫病原体的关键候选基因,需要进一步调查.
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