A: The variant NC_000019.10:g.18124326T>C in gene MAST3 is classified as 'Uncertain_significance' for Developmental_and_epileptic_encephalopathy_108. Molecular consequence: SO:0001583: missense_variant. Variant type: single_nucleotide_variant. Disease database links: MONDO:MONDO:0859314,MedGen:C5774253,OMIM:620115. Review status: criteria provided, single submitter.