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18 October 2018 : Clinical Research  

Gene Mutation Analysis and Prenatal Diagnosis of the Ornithine Transcarbamylase (OTC) Gene in Two Families with Ornithine Transcarbamylase Deficiency

Sitao Li1ABDE, Yao Cai1BDF, Congcong Shi1BCE, Mengxian Liu1AD, Bingqing Liu1BE, Lin Lin2CF, Xin Xiao1BDEG*, Hu Hao1ACEG

DOI: 10.12659/MSM.911295

Med Sci Monit 2018; 24: CLR7431-7437

Abstract

BACKGROUND: The aim of this study was to perform gene detection in 2 clinical cases of highly suspected ornithine transcarbamylase deficiency (OTCD) pediatric patients by first-generation sequencing technology in order to confirm the pathogenic genetic factors of their families and allow the families to undergo genetic counselling and prenatal diagnosis.

MATERIAL AND METHODS: The peripheral DNA samples of 2 children with highly suspected OTCD (the probands) and their parents were collected. DNA fragments corresponding to exons 1–10 of the OTC gene from the samples were amplified using polymerase chain reaction (PCR), and then subjected to Sanger sequencing to confirm the pathogenic mutation sites.

RESULTS: The probands were both confirmed to have OTCD. The proband in Family 1 was a male carrying a c.867+1G>C mutation at a splice site within the OTC gene. The gene detection results of amniotic fluid cells at 16 weeks of pregnancy showed that the fetus was a male who also carried the c.867+1G>C mutation. The proband in Family 2 was a male carrying a c.782T>C(p. I261T) mutation in the OTC gene. The gene detection results of amniotic fluid cells at 18 weeks showed that the fetus was a male without pathogenic mutations in the OTC gene. The gene detection results of peripheral blood from the fetus after birth were consistent with those obtained from amniotic fluid cells.

CONCLUSIONS: Pediatric children who are clinically suspected of OTCD can receive a definitive diagnosis through OTC gene detection.

Keywords: Mutation, Ornithine Carbamoyltransferase Deficiency Disease, Prenatal Diagnosis

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750