目的通过临床表型分析、NHS基因变异检测明确1个Nance-Horan综合征家系的致病原因,为临床诊断提供依据。方法提取先证者及其母亲、外祖父母外周血基因组DNA,进行先天性白内障相关基因的高通量技术测序。根据美国医学遗传学与基因组学学...目的通过临床表型分析、NHS基因变异检测明确1个Nance-Horan综合征家系的致病原因,为临床诊断提供依据。方法提取先证者及其母亲、外祖父母外周血基因组DNA,进行先天性白内障相关基因的高通量技术测序。根据美国医学遗传学与基因组学学会(American College of Medical Genetics and Genomics,ACMG)遗传变异分类标准与指南判断变异位点的致病性,并进行Sanger测序验证。提取先证者母亲mRNA,用逆转录-PCR检测其转录水平的表达;用短串联重复序列分析其亲缘关系。结果先天性白内障相关基因检测结果显示先证者NHS基因存在c.766dupC(p.Leu256Profs*21)半合子变异,母亲NHS基因存在c.766dupC杂合变异,表型正常的外祖父母及100名表型正常的对照中均未检测到该变异,HGMD等数据库未见该变异的报道。根据ACMG遗传变异分类标准与指南,NHS基因c.766dupC(p.Leu256Profs*21)变异被判定为致病性变异(PVS1+PM2+PM6+PP4)。结论c.766dupC变异可能为该Nance-Horan综合征家系的致病原因。展开更多
AIM: To identify the disease-causing mutation in a fourgeneration Chinese family diagnosed with Nance-Horan syndrome(NHS). METHODS: A Chinese family, including four affected patients and four healthy siblings, was rec...AIM: To identify the disease-causing mutation in a fourgeneration Chinese family diagnosed with Nance-Horan syndrome(NHS). METHODS: A Chinese family, including four affected patients and four healthy siblings, was recruited. All family members received ophthalmic examinations with medical histories provided. Targeted next-generation sequencing approach was conducted on the two affected males to screen for their disease-causing mutations. RESULTS: Two male family members diagnosed with NHS manifested bilateral congenital cataracts microcornea, strabismus and subtle facial and dental abnormalities, while female carriers presented posterior Y-sutural cataracts. A novel frameshift mutation(c.3916_3919 del) in the NHS gene was identified. This deletion was predicted to alter the reading frame and generate a premature termination codon after a new reading frame. CONCLUSION: The study discovers a new frameshift mutation in a Chinese family with NHS. The findings broaden the spectrum of NHS mutations that can cause NHS in Chinese patients.展开更多
文摘目的通过临床表型分析、NHS基因变异检测明确1个Nance-Horan综合征家系的致病原因,为临床诊断提供依据。方法提取先证者及其母亲、外祖父母外周血基因组DNA,进行先天性白内障相关基因的高通量技术测序。根据美国医学遗传学与基因组学学会(American College of Medical Genetics and Genomics,ACMG)遗传变异分类标准与指南判断变异位点的致病性,并进行Sanger测序验证。提取先证者母亲mRNA,用逆转录-PCR检测其转录水平的表达;用短串联重复序列分析其亲缘关系。结果先天性白内障相关基因检测结果显示先证者NHS基因存在c.766dupC(p.Leu256Profs*21)半合子变异,母亲NHS基因存在c.766dupC杂合变异,表型正常的外祖父母及100名表型正常的对照中均未检测到该变异,HGMD等数据库未见该变异的报道。根据ACMG遗传变异分类标准与指南,NHS基因c.766dupC(p.Leu256Profs*21)变异被判定为致病性变异(PVS1+PM2+PM6+PP4)。结论c.766dupC变异可能为该Nance-Horan综合征家系的致病原因。
文摘AIM: To identify the disease-causing mutation in a fourgeneration Chinese family diagnosed with Nance-Horan syndrome(NHS). METHODS: A Chinese family, including four affected patients and four healthy siblings, was recruited. All family members received ophthalmic examinations with medical histories provided. Targeted next-generation sequencing approach was conducted on the two affected males to screen for their disease-causing mutations. RESULTS: Two male family members diagnosed with NHS manifested bilateral congenital cataracts microcornea, strabismus and subtle facial and dental abnormalities, while female carriers presented posterior Y-sutural cataracts. A novel frameshift mutation(c.3916_3919 del) in the NHS gene was identified. This deletion was predicted to alter the reading frame and generate a premature termination codon after a new reading frame. CONCLUSION: The study discovers a new frameshift mutation in a Chinese family with NHS. The findings broaden the spectrum of NHS mutations that can cause NHS in Chinese patients.
