CHRND variant in a paternally inherited esophageal atresia and tracheoesophgageal fistula: Report of a case.

ABSTRACT

BACKGROUND: The familial occurrence of esophageal atresia and tracheoesophageal fistula (EA-TEF) is very rare and the genetic basis behind the isolated familial cases have not been identified. A male infant born with EA-TEF and his affected father were evaluated with whole genome sequence to define a genetic causative variation in paternally inherited EA-TEF. CASE REPORT A male infant was born to 29-years-old, gravida 1, para 1 women by normal vaginal delivery. The patient was diagnosed as Type-C EA-TEF. In his family history, his father was also operated for EA-TEF during neonatal period. He had no associated anomaly despite patent foramen ovale. Genomic DNAs were extracted from peripheral blood of the patient and the father. When causative genes responsible for EA-TEF were filtered out, four different variants in NOTCH2, SAMD9, SUPT20H and CHRND were found. Except the variant found in CHRND (NM_000751.2, c.381C>G, p.(Tyr127Ter)), other three variants were not found to be segregated with the father who has EA-TEF also. This nonsense variant was not found in GnomAD database. CONCLUSION: CHRND variant found in both EA-TEF patient and his affected father suggest that CHRND variant might possibly be considered as one of the causative genetic variants in familial isolated EA-TEF patients.