A: The variant NC_000020.11:g.34281163C>T in gene AHCY is classified as 'Uncertain_significance' for Hypermethioninemia. Molecular consequence: SO:0001819: synonymous_variant. Variant type: single_nucleotide_variant. Disease database links: Human_Phenotype_Ontology:HP:0003235,MONDO:MONDO:0000351,MedGen:C4048705. Review status: criteria provided, single submitter.