A: The variant NC_000021.9:g.45468471G>A in gene COL18A1 is classified as 'Benign' for not_provided|COL18A1-related_disorder. Molecular consequence: SO:0001819: synonymous_variant. Variant type: single_nucleotide_variant. Disease database links: MedGen:C3661900|.. Review status: criteria provided, single submitter.