Preimplantation genetic testing for monogenic/single gene disorders in a family with Molybdenum co-factor deficiency
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目的 对1个MOCS2基因变异所致钼辅助因子缺乏症家系进行单基因病胚胎植入前遗传学检测(PGT-M)。 方法 选取2020年4月于广西壮族自治区妇幼保健院就诊的1个钼辅助因子缺乏症家系为研究对象。通过卵胞浆内单精注射技术进行体外授精，将受精卵培养至囊胚期后，活检采集滋养层细胞，运用单细胞全基因组扩增、高通量测序及单核苷酸多态性连锁单体型分析等技术检测胚胎是否携带MOCS2基因变异和4 Mb以上的染色体拷贝数变异(CNV)，移植无或携带杂合变异且无染色体CNV的胚胎，妊娠成功后于孕中期进行羊水穿刺产前诊断，验证PGT-M的结果，并进行后续的妊娠随访。 结果 共获卵11枚，3枚成功发育为囊胚，PGT-M结果提示1枚携带母源性MOCS2基因杂合变异且无染色体CNV的胚胎可用于移植。胚胎解冻移植后获宫内单胎妊娠，孕18周羊水穿刺产前诊断提示胎儿的MOCS2基因携带情况和染色体分析结果与PGT-M结果一致，于孕37+5周活产1健康男婴。 结论 PGT-M技术可帮助携带MOCS2基因变异的夫妇生育健康后代，是携带致病变异家庭的一种重要的优生方式。 Objective To carry out preimplantation genetic testing for monogenic/single gene disorders (PGT-M) for a Chinese family affected with molybdenum co-factor deficiency due to pathogenic variant of MOCS2 gene. Methods A family with molybdenum co-factor deficiency who attended to the Maternal and Child Health Care Hospital of Guangxi Zhuang Autonomous Region in April 2020 was selected as the research subject. Trophoblast cells were biopsied from blastocysts fertilized by intracytoplasmic sperm injection. Embryos carrying the MOCS2 gene variant and chromosome copy number variation(CNV) of more than 4 Mb were detected by single-cell whole genome amplification, high-throughput sequencing and single nucleotide polymorphism typing. Embryos without or carrying the heterozygous variant and without abnormal chromosome CNV were transplanted. During mid-pregnancy, amniotic fluid sample was collected for prenatal diagnosis to verify the results of PGT-M. Results Eleven oocytes were obtained, among which three blastocysts were formed through culturing. Results of genetic testing suggested that one embryo was heterozygous for the maternally derived MOCS2 gene variant and without chromosomal CNV. Following embryo transfer, intrauterine singleton pregnancy was attained. Prenatal diagnosis by amniocentesis at 18 weeks of gestation revealed that the MOCS2 gene variant and chromosomal analysis results were both consistent with that of PGT-M, and a healthy male infant was born at 37+ 5 weeks of gestation. Conclusion PGT-M has helped the couple carrying the MOCS2 gene variant to have a healthy offspring, and may become an important method for couples carrying other pathogenic genetic variants.
Objective To carry out preimplantation genetic testing for monogenic/single gene disorders (PGT-M) for a Chinese family affected with molybdenum co-factor deficiency due to pathogenic variant of MOCS2 gene. Methods A family with molybdenum co-factor deficiency who attended to the Maternal and Child Health Care Hospital of Guangxi Zhuang Autonomous Region in April 2020 was selected as the research subject. Trophoblast cells were biopsied from blastocysts fertilized by intracytoplasmic sperm injection. Embryos carrying the MOCS2 gene variant and chromosome copy number variation(CNV) of more than 4 Mb were detected by single-cell whole genome amplification, high-throughput sequencing and single nucleotide polymorphism typing. Embryos without or carrying the heterozygous variant and without abnormal chromosome CNV were transplanted. During mid-pregnancy, amniotic fluid sample was collected for prenatal diagnosis to verify the results of PGT-M. Results Eleven oocytes were obtained, among which three blastocysts were formed through culturing. Results of genetic testing suggested that one embryo was heterozygous for the maternally derived MOCS2 gene variant and without chromosomal CNV. Following embryo transfer, intrauterine singleton pregnancy was attained. Prenatal diagnosis by amniocentesis at 18 weeks of gestation revealed that the MOCS2 gene variant and chromosomal analysis results were both consistent with that of PGT-M, and a healthy male infant was born at 37+ 5 weeks of gestation. Conclusion PGT-M has helped the couple carrying the MOCS2 gene variant to have a healthy offspring, and may become an important method for couples carrying other pathogenic genetic variants.
Molybdenum co-factor deficiencyMOCS2 genePreimplantation genetic testingEmbryo transfer
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