检验医学 ›› 2026, Vol. 41 ›› Issue (2): 150-154.DOI: 10.3969/j.issn.1673-8640.2026.02.008

• 遗传性疾病精准检测与诊断专题 • 上一篇    下一篇

KMT2A基因新突变引起的Wiedemann-Steiner综合征家系特征分析

岳雨梅1, 熊婵玉2, 谈颂2, 周玉2, 傅启华2()   

  1. 1.电子科技大学医学院四川 成都 610054
    2.四川省医学科学院·四川省人民医院医学遗传与罕见病中心四川 成都 610072
  • 收稿日期:2024-10-08 修回日期:2025-07-04 出版日期:2026-02-28 发布日期:2026-03-06
  • 通讯作者: 傅启华,E-mail:qihuafu@126.com
  • 作者简介:岳雨梅,女,2000年生,本科,主要研究方向为免疫系统罕见病。

Characteristic analysis of Wiedemann-Steiner syndrome in a family caused by a new mutation of KMT2A gene

YUE Yumei1, XIONG Chanyu2, TAN Song2, ZHOU Yu2, FU Qihua2()   

  1. 1. School of MedicineUniversity of Electronic Science and Technology of ChinaChengdu 610054,Sichuan, China
    2. Center for Medical Genetics and Rare DiseasesSichuan Provincial People's Hospital,Sichuan Academy of Medical SciencesChengdu 610072,Sichuan, China
  • Received:2024-10-08 Revised:2025-07-04 Online:2026-02-28 Published:2026-03-06

摘要:

目的 探讨1例由KMT2A基因新突变引起的Wiedemann-Steiner综合征(WDSTS)家系的临床特征和基因变异位点。方法 收集WDSTS先证者及家系成员的临床资料和外周血样本,提取基因组DNA,进行全外显子组测序、数据分析和Sanger测序验证。结果 先证者的临床特征包括智力障碍、特殊面容、生长发育迟缓、肢体多毛等。先证者及其母亲和弟弟均携带KMT2A基因杂合移码突变11q23.3(NM_005933.4):c.3061_3062delAA/p.Lys1021fs*17,为KMT2A基因的新突变。Sanger测序验证后确定KMT2A基因新变异位点c.3061_3062delAA/p.Lys1021fs*17为WDSTS家系的致病原因。结论 发现1个新的KMT2A基因变异位点c.3061_3062delAA/p.Lys1021fs*17,扩大了WDSTS的致病基因谱和表型谱。

关键词: KMT2A基因, 基因突变, Wiedemann-Steiner综合征

Abstract:

Objective To investigate the clinical characteristics and the gene mutation site of a family with Wiedemann-Steiner syndrome(WDSTS) caused by a new mutation in KMT2A gene. Methods The clinical data and peripheral blood samples of the proband and family members were collected. Genomic DNA was extracted,and whole-exome sequencing,datum analysis and Sanger sequencing verification were performed. Results The clinical characteristics of the proband included intellectual disability,special facial features,growth and development retardation and multiple hair on the limbs. The proband,his mother and his younger brother all carried a heterozygous frameshift mutation in the KMT2A gene at 11q23.3(NM_005933.4):c.3061_3062delAA/p.Lys1021fs*17,and it was a new mutation in the KMT2A gene. After Sanger sequencing verification,it was determined that KMT2A gene c.3061_3062delAA/p.Lys1021fs*17 was pathogenic. Conclusions A new mutation site in the KMT2A gene c.3061_3062delAA/p.Lys1021fs*17 has been found,expanding the pathogenic gene and phenotypic spectrum of WDSTS.

Key words: KMT2A gene, Genetic mutation, Wiedemann-Steiner syndrome

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