摘要目的:探讨1例心脏-泌尿生殖综合征(CUGS)胎儿的临床特征及基因变异特点。方法:选取2019年1月首都医科大学附属北京安贞医院胎儿心脏病母胎医学中心诊断的1例先天性心脏病胎儿为研究对象。收集胎儿的临床资料，应用低深度全基因组测序(CNV-seq)和家系全外显子组测序(trio-WES)技术对胎儿及其父母进行遗传学分析，对候选变异进行Sanger测序家系验证。结果:胎儿超声心动图提示主动脉弓发育不良。trio-WES检测发现胎儿携带 MYRF基因c.1792-2A>C剪接变异，其父母均为野生型；Sanger测序验证该变异为新发变异。根据美国医学遗传与基因组学学会(ACMG)相关指南，评估为可能致病性变异。CNV-seq检测未发现非整倍体或与胎儿表型相关的致病性拷贝数变异。结合胎儿的临床表型及遗传学检测结果，考虑诊断为CUGS。 结论:MYRF基因c.1792-2A>C新发剪接变异可能是导致胎儿心脏畸形的遗传学病因。本研究丰富了 MYRF基因的致病变异谱。

abstractsObjective:To explore the genetic basis for a fetus with Cardiac-urogenital syndrome (CUGS).Methods:A fetus with congenital heart disease identified at the Maternal Fetal Medical Center for Fetal Heart Disease, Beijing Anzhen Hospital Affiliated to Capital Medical University in January 2019 was selected as the study subject. Clinical data of the fetus was collected. Copy number variation sequencing (CNV-seq) and trio-whole exome sequencing (trio-WES) were carried out for the fetus and its parents. Candidate variants were verified by Sanger sequencing.Results:Detailed fetal echocardiographic examination had revealed hypoplastic aortic arch. The results of trio-WES revealed that the fetus has harbored a de novo splice variant of the MYRF gene (c.1792-2A>C), for which both parents were of the wild-type. Sanger sequencing confirmed the variant to be de novo. Based on the guidelines from the American College of Medical Genetics and Genomics (ACMG), the variant was rated as likely pathogenic. CNV-seq has identified no chromosomal anomalies. And the fetus was diagnosed with Cardiac-urogenital syndrome. Conclusion:The de novo splice variant of the MYRF gene probably underlay the abnormal phenotype in the fetus. Above finding has enriched the spectrum of MYRF gene variants.