基础医学与临床 ›› 2012, Vol. 32 ›› Issue (6): 660-663.

• 研究论文 • 上一篇    下一篇

一种新复合杂合突变导致21-羟化酶缺陷症

陈晨1,2,聂敏3,卢琳4,陆召麟3,孙梅励5,杨秀萍6   

  1. 1. 北京协和医院内分泌科卫生部内分泌重点实验室
    2. 首都师范大学
    3. 中国医学科学院北京协和医学院北京协和医院内分泌科
    4. (1. 中国医学科学院 北京协和医学院 北京协和医院内分泌科 卫生部内分泌重点实验室
    5. 中国医学科学院 北京协和医学院 北京协和医院内分泌科 卫生部内分泌重点实验室
    6. 首都师范大学生命科学学院
  • 收稿日期:2012-04-05 修回日期:2012-04-26 出版日期:2012-06-05 发布日期:2012-05-25
  • 通讯作者: 聂敏 E-mail:nm_pumch@yahoo.com.cn
  • 基金资助:
    国家自然自然科学基金

A novel Compound Heterozygous Mutations causing 21-Hydroxylase Deficiency

  • Received:2012-04-05 Revised:2012-04-26 Online:2012-06-05 Published:2012-05-25
  • Contact: Min NIE, E-mail:nm_pumch@yahoo.com.cn

摘要: 摘要:目的 通过对一例单纯男性化型21-羟化酶缺陷症(21-OHD)患者的临床特点及基因突变研究,探讨21-OHD基因突变的类型和特点及临床表型与基因突变类型之间的关系。方法 收集患者的临床资料,提取患者外周血白细胞DNA,用PCR方法扩增CYP21A2基因的10个外显子及内含子边界,测序鉴定该患者CYP21A2基因突变位点,进一步分析突变位点与临床表型的关系。结果 患者的临床表现主要为外阴发育异常。基因测序结果显示为复合杂合突变,其一个等位基因为c.515 T>A,p.I172N,另一个等位基因为c.593 T>G,p.L198X,此种复合杂合突变主要引起单纯男性化表现。p.L198X是至今尚未见报道的一种新突变。结论 本研究通过对患者CYP21A2基因突变分析,发现了CYP21A2基因一种新的突变p.L198X,丰富了CYP21A2基因突变数据库。同时从分子遗传学方面证实了对患者的诊断,患者基因型能很好地解释其临床表现。

关键词: 21-羟化酶缺陷症, CYP21A2基因, 基因突变

Abstract: Abstract: Objective To investigate the clinical and molecular genetic characteristics of a Chinese patient with 21-hydrosylase deficiency (21-OHD). Methods Clinical features and laboratory data were collected from that patient. Ten exons and the boundaries of exon-intron of CYP21A2 gene were amplified by PCR and sequenced. The correlation between clinical characteristics and genotype was analyzed. Results The female patient was diagnosed as 21-OHD with simple-virilizing form according to the clinical manifestation. DNA sequencing results showed a heterozygous mutation. One allele of the patient contained a base transversion (T>A) at c.515 and led to a missense mutation of Ile to Asn at the 172th amino acid. The other allele had one base transversion (T>G) at c.593 and led to a nonsense mutation at the 198th codon, which is a new mutation. The novel compound heterozygous mutations cause the simple-virilizing form of congenital adrenal hyperplasia. Conclusion Through CYP21A2 gene analysis, a new mutation causing 21-OHD was found, which broadened the mutation database, and the clinical diagnosis of 21-OHD was confirmed.

Key words: 21-hydrosylase deficiency, CYP21A2 gene, gene mutions