A: The variant NC_000019.10:g.18868668_18868671del in gene GDF1 is classified as 'Pathogenic/Likely_pathogenic' for Congenital_heart_defects,_multiple_types,_6|not_provided|Right_atrial_isomerism. Molecular consequence: SO:0001589: frameshift_variant,SO:0001624: 3_prime_UTR_variant. Variant type: Deletion. Disease database links: MONDO:MONDO:0013463,MedGen:C3151221,OMIM:613854,Orphanet:860|MedGen:C3661900|Human_Phenotype_Ontology:HP:0011536,MONDO:MONDO:0008832,MedGen:C3178806,OMIM:208530,Orphanet:97548. Review status: criteria provided, multiple submitters, no conflicts.