Clinical and genetic analysis of a fetus with 17q12 microdeletion syndrome
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目的 探讨1例17q12微缺失综合征胎儿的临床表型和遗传学特征。 方法 选取2020年6月在湖州市妇幼保健院确诊的1例17q12微缺失综合征胎儿作为研究对象。收集胎儿的临床资料，对孕妇进行羊水穿刺，对胎儿进行染色体核型分析和染色体微阵列分析(CMA)，采集孕妇夫妇的外周血样进行CMA检测，追溯胎儿异常染色体的亲代来源，追踪患儿出生后的临床表型。 结果 产前超声提示羊水增多，胎儿肾脏结构异常。胎儿染色体核型为46，XN，CMA结果提示其染色体17q12区存在1.9 Mb的杂合缺失，涉及HNF1B、ACACA、ZNHIT3、CCL3L1、PIGW等5个OMIM基因，根据美国医学遗传学与基因组学学会(ACMG)相关指南，评估为致病性拷贝数变异。胎儿父母CMA检测均未见异常。患儿出生后主要表现为肾囊肿和脑结构异常，结合产前基因表型，确诊为17q12微缺失综合征。 结论 17q12微缺失综合征胎儿在出生后的随访中出现了肾脏及脑结构异常改变，可能与HNF1B等基因的功能缺陷密切相关。 Objective To explore the clinical phenotype and genetic characteristics of a fetus with 17q12 microdeletion syndrome. Methods A fetus with 17q12 microdeletion syndrome who was diagnosed at Huzhou Maternal & Child Health Care Hospital in June 2020 was selected as the study subject. Clinical data of the fetus was collected. The fetus was subjected to chromosomal karyotyping and chromosomal microarray analysis (CMA). To determine the origin of fetal chromosomal abnormality, its parents were also subjected to CMA assay. The postnatal phenotype of the fetus was also investigated. Results Prenatal ultrasound revealed polyhydramnios and fetal renal dysplasia. The fetus was found to have a normal chromosomal karyotype. CMA has detected a 1.9 Mb deletion in the 17q12 region, which has encompassed five OMIM genes including HNF1B, ACACA, ZNHIT3, CCL3L1 and PIGW. Based on the guidelines from the American College of Medical Genetics and Genomics (ACMG), the 17q12 microdeletion was predicted as pathogenic copy number variation (CNV). CMA analysis has detected no pathogenic CNV in both parents. After birth, the child was found to have renal cysts and abnormal brain structure. Combined with the prenatal findings, the child was diagnosed with 17q12 microdeletion syndrome. Conclusion The fetus has 17q12 microdeletion syndrome presenting as abnormalities of the kidney and central nervous system, which are strongly correlated with functional defects of the deletion region involving the HNF1B and other pathogenic genes.
Objective To explore the clinical phenotype and genetic characteristics of a fetus with 17q12 microdeletion syndrome. Methods A fetus with 17q12 microdeletion syndrome who was diagnosed at Huzhou Maternal & Child Health Care Hospital in June 2020 was selected as the study subject. Clinical data of the fetus was collected. The fetus was subjected to chromosomal karyotyping and chromosomal microarray analysis (CMA). To determine the origin of fetal chromosomal abnormality, its parents were also subjected to CMA assay. The postnatal phenotype of the fetus was also investigated. Results Prenatal ultrasound revealed polyhydramnios and fetal renal dysplasia. The fetus was found to have a normal chromosomal karyotype. CMA has detected a 1.9 Mb deletion in the 17q12 region, which has encompassed five OMIM genes including HNF1B, ACACA, ZNHIT3, CCL3L1 and PIGW. Based on the guidelines from the American College of Medical Genetics and Genomics (ACMG), the 17q12 microdeletion was predicted as pathogenic copy number variation (CNV). CMA analysis has detected no pathogenic CNV in both parents. After birth, the child was found to have renal cysts and abnormal brain structure. Combined with the prenatal findings, the child was diagnosed with 17q12 microdeletion syndrome. Conclusion The fetus has 17q12 microdeletion syndrome presenting as abnormalities of the kidney and central nervous system, which are strongly correlated with functional defects of the deletion region involving the HNF1B and other pathogenic genes.
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