hypoplastic left heart syndrome hypoplastic left heart syndrome 1 https://github.com/monarch-initiative/mondo/issues/9602 https://www.malacards.org/card/hypoplastic_left_heart_syndrome_1 hypoplastic left heart syndrome 1 GJA1 hypoplastic left heart syndrome HLHS1 MEDGEN:1646779 HLHS Any hypoplastic left heart syndrome in which the cause of the disease is a mutation in the GJA1 gene. MONDO:0009433 hypoplastic left heart syndrome caused by mutation in GJA1 UMLS:C4551854 hypoplastic left heart syndrome type 1 OMIM:241550 GARD:0024671