A: The variant NC_000019.10:g.18870216_18870223dup in gene GDF1 is classified as 'Likely_pathogenic' for Right_atrial_isomerism. Molecular consequence: SO:0001589: frameshift_variant,SO:0001624: 3_prime_UTR_variant. Variant type: Duplication. Disease database links: Human_Phenotype_Ontology:HP:0011536,MONDO:MONDO:0008832,MedGen:C3178806,OMIM:208530,Orphanet:97548. Review status: criteria provided, single submitter.