由于CYP4A22的功能丧失,导致一种新型的维生素D依赖性恶心病 (VDDR1C)
Xiaohong Duan1, Yanli Zhang1, Taoyun Xu1
1State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, National Clinical Research Center for Oral Diseases, Shaanxi Key Laboratory of Stomatology, Department of Oral Biology, Clinic of Oral Rare Diseases and Genetic Diseases, School of Stomatology, The Fourth Military Medical University, 145 West Changle Road, Xi'an 710032, China.
研究人员发现了一种与CYP4A22基因相关的维生素D依赖性狂犬病 (VDDR) 的新遗传原因. 这种基因的突变会破坏维生素D的激活,导致一种新型的VDDR1C型.
科学领域:
- 遗传学 遗传学 是一个
- 内分泌学 在内分泌学.
- 分子生物学分子生物学
背景情况:
- 维生素D依赖性恶心病 (VDDR) 包括遗传疾病,由于维生素D激活或反应受损,导致早期发病的恶心病.
- 根据致病基因,VDDR被分为亚型,已知类型包括VDR,CYP2R1和CYP27B1.1.
研究的目的:
- 在一个中国家庭中确定一种新型的自体主导VDDR的遗传基础.
- 阐明鉴定出基因在维生素D代谢中的作用.
主要方法:
- 采用了全外体测序和随后的生物信息分析,PCR和桑格测序.
- 功能性研究涉及HepG2细胞中野生型和突变CYP4A22的过度表达和siRNA介导的CYP2R1.1.
主要成果:
- 在研究的血统中,CYP4A22基因的无意义突变 (c.900delG) 被确定为VDDR的原因.
- 过度表达的野生型CYP4A22局限于内细胞网膜和戈尔吉器官,合成25-氧维生素D3 (25[OH]D3).
- 该CYP4A22突变损害了25[OH]D3的合成,并影响了CYP2R1的表达,这表明它在维生素D氧化中发挥了作用.
结论:
- CYP4A22作为维生素D3的新型25-基酶起作用.
- 在CYP4A22中失去功能的突变会导致VDDR的新亚型,称为VDDR类型1C (VDDR1C).
- CYP2R1和CYP4A22可能表现出基因补偿机制,以应对对方的表达水平.
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