has_variant_part is_variant_allele_of varies_with variant allele gene allele reference allele variant gene allele A gene allele is 'variant' in virtue of its containing a sequence alteration that varies from some reference gene standard. But note that a gene allele that is variant in one context/dataset can be considered a reference in another context/dataset. An allele of a gene that contains some sequence alteration. gene sequence_alteration