一例成骨不全家系致病变异的鉴定及胚胎植入前遗传学检测

目的:明确一例成骨不全(osteogenesis imperfecta，OI)家系的致病变异并为其提供胚胎植入前遗传学检测(preimplantation genetic testing，PGT)。方法:应用高通量测序结合Sanger测序的方法鉴定患者的候选变异，用直接检测变异的方法对胚胎进行PGT检测，同时筛查囊胚的...

Identification of pathogenic variant and preimplantation genetic testing for a Chinese family affected with osteogenesis imperfecta

Objective To identify the pathogeic variant for a husband with osteogenesis imperfecta and provide preimplantation genetic testing(PGT)for the couple.Methods High-throughput sequencing and Sanger sequencing were carried out to identify the pathologic variant in the husband patients.PGT of embryos was performed through direct detection of the mutation site.Meanwhile,chromosome aneuploidy of the blastocysts was screened.Following transplantation,cytogenetic and genetic testing of fetal amniotic fluid sample was carried out during mid-pregnancy.Chromosome copy number variant(CNV)was detected at multiple sites of the placenta after delivery.Results The husband was found to harbor heterozygous c.544-2A>G variant of the COL1A1 gene.The same variant was not detected in either of his parents.PGT revealed that out of three embryos of the couple,one was wild-type for the c.544-2A site but mosaicism for duplication of 16p13.3-11.2.The other two embryos were both heterozygous for the c.544-2A>G variant.Following adequate genetic counseling,the wild-type embryo was transplanted.Amniotic fluid testing confirmed that the fetus had normal chromosomes and did not carry the c.544-2A>G variant.The copy number of chromosomes at different parts of placenta was normal after birth.Conclusion For couples affected with monogenic disorders,e.g.,osteogenesis imperfecta,direct detection of the mutation site may be used for PGT after identifying the pathogenic variant.After adequate genetic counseling,prenatal diagnosis must be carried out to ensure the result.