Sequencing was focused on the exome of the following twenty-two candidate genes correlated with LR axis development: NPHP4, LEFTY1, LEFTY2, CFC1, ACVR2B, TGFBR2, RPSA, CRELD1, SHROOM3, DNAH5, GJA1, FOXH1, INVS, ARMC4, NODAL, NET43, BCL9L, NEK8, CCDC11, MEGF8, SMAD2 and ZIC3. These genes were interrogated for novel or rare coding variants present only in heterotaxy patients with CHD. The gene discussed is NPHP4; the disease is coronary artery disorder.