检验医学 ›› 2026, Vol. 41 ›› Issue (2): 126-132.DOI: 10.3969/j.issn.1673-8640.2026.02.005

• 遗传性疾病精准检测与诊断专题 • 上一篇    下一篇

NHS基因变异导致Nance-Horan综合征的产前病例报道与遗传学分析

张曼1, 田瑞霞2, 孙自祥1, 陈程2, 魏卓君2, 赵旭亮3()   

  1. 1.中国人民解放军联勤保障部第901医院检验科安徽 合肥 230031
    2.中国人民解放军联勤保障部第901医院妇产科安徽 合肥 230031
    3.池州市妇女儿童医院(池州市妇幼保健院)检验科安徽 池州 247099
  • 收稿日期:2024-12-01 修回日期:2025-06-16 出版日期:2026-02-28 发布日期:2026-03-06
  • 通讯作者: 赵旭亮,E-mail:zhaoxuliang901@163.com
  • 作者简介:张 曼,女,1985年生,学士,主管技师,主要从事遗传性疾病的分子诊断工作。
  • 基金资助:
    安徽医科大学校级科研项目(2022xki128)

Prenatal case report and genetic analysis of Nance-Horan syndrome caused by a new NHS gene variation

ZHANG Man1, TIAN Ruixia2, SUN Zixiang1, CHEN Cheng2, WEI Zhuojun2, ZHAO Xuliang3()   

  1. 1. Department of Clinical Laboratorythe No. 901 Hospital of the Joint Service of the People's Liberation ArmyHefei 230031,Anhui, China
    2. Department of Obstetrics and Gynecologythe No. 901 Hospital of the Joint Service of the People's Liberation ArmyHefei 230031,Anhui, China
    3. Department of Clinical LaboratoryChizhou Maternal and Child Health Care HospitalChizhou 247099,Anhui, China
  • Received:2024-12-01 Revised:2025-06-16 Online:2026-02-28 Published:2026-03-06

摘要:

目的 探讨1例产前超声检查诊断为先天性白内障(CC)胎儿的遗传学病因,分析Nance-Horan综合征的致病基因变异和产前超声表现。方法 采集1例孕24+3周超声提示胎儿双眼CC的孕妇的羊水样本和夫妻双方的外周血样本,进行家系全外显子组测序(Trio-WES),并通过Sanger测序验证候选变异。对变异进行生物信息学分析,并检索公共变异数据库(dbSNP数据库、千人基因组数据库、ExAC数据库、gnomAD数据库和ESP数据库),评估变异在人群中的分布频率。检索疾病相关数据库(HGMD数据库、ClinVar数据库和OMIM数据库),查看变异的文献报道。采用蛋白预测工具评估变异的致病性。结果 Trio-WES检测结果显示,胎儿X染色体NHS基因存在半合子移码变异[NM_001291867.2:c.3799dup(p.Cys1267Leufs*18)],孕妇为该变异杂合携带者,其丈夫为野生型。c.3799dup(p.Cys1267Leufs*18)变异未在公共变异数据库和疾病相关数据库中收录,属于新变异。未检出其他致病性变异,结合胎儿双侧CC的超声特征,确诊为NHS基因变异所致的Nance-Horan综合征。经遗传咨询后,孕妇选择终止妊娠。结论 Trio-WES可实现对胎儿期Nance-Horan综合征的精准分子诊断。c.3799dup(p.Cys1267Leufs*18)是NHS基因的新变异,丰富了该疾病的变异谱,同时为家系的产前诊断和再生育策略提供了重要依据。

关键词: NHS基因, 先天性白内障, Nance-Horan综合征, 产前诊断, 全外显子组测序

Abstract:

Objective To investigate the genetic cause of a fetus diagnosed with congenital cataract(CC) by prenatal ultrasound,and to analyze the pathogenic gene variations and prenatal ultrasound manifestations of Nance-Horan syndrome. Methods A sample of amniotic fluid from a pregnant woman at 24+3 weeks of gestation who was suspected of having bilateral CC in the fetus,as well as peripheral blood samples from the pregnant woman and her husband,were collected for family Trio-whole-exome sequencing(Trio-WES). The candidate variations were verified by Sanger sequencing. The variations were analyzed by bioinformatics,and the distribution frequency of the variations was evaluated by searching public variation databases(dbSNP database,1000 Genomes database,ExAC database,gnomAD database and ESP database). The literature reports of the variations were retrieved from disease-related databases(HGMD database,ClinVar database and OMIM database). The pathogenicity of the variations was evaluated by protein prediction tools. Results The Trio-WES results showed that a hemizygous frameshift variation [NM_001291867.2:c.3799dup(p.Cys1267Leufs*18)] was present in the X chromosome of the fetus,and the pregnant woman was a heterozygous carrier of this variation,while her husband had the wild type. The c.3799dup(p.Cys1267Leufs*18) variation was not included in the public variation databases and disease-related databases,and it was a new variation. No other pathogenic variations were determined. Combined with the ultrasound characteristics of bilateral CC in the fetus,Nance-Horan syndrome caused by NHS gene variation was diagnosed. After genetic counseling,the pregnant woman chose to terminate the pregnancy. Conclusions Trio-WES can achieve precise molecular diagnosis of Nance-Horan syndrome in the fetal period. The c.3799dup(p.Cys1267Leufs*18) is a new variation of NHS gene,enriching the variation spectrum of this disease,and providing a reference for prenatal diagnosis and reproductive strategies.

Key words: NHS gene, Congenital cataract, Nance-Horan syndrome, Prenatal diagnosis, Whole-exome sequencing

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