Congenital heart disease (CHD) is the most common birth defect, affecting 2‑8% of newborns, with a marked impact on neonatal health. In the present study, the parents of a fetus diagnosed with CHD were recruited to investigate the genetic causes of this condition. Whole exome sequencing was conducted on tissue obtained from the fetus. A compound heterozygous mutation in the dynein axonemal heavy chain 9 (