The NM_004958.4:c.1249A>G variant in the MTOR gene is a missense variant predicted to cause substitution of methionine by valine at amino acid 417. In gnomAD v4.1.0, this variant has a filtering allele frequency of 0.001567% in the European (non-Finnish) population and a minor allele frequency of 0.002288% (27/1180014), also in the European (non-Finnish) population (PM2_Supporting, BS1, and BS1_Supporting not met). MTOR, in which the variant was identified, is defined by the ClinGen Brain Malformations Variant Curation Expert Panel (BM VCEP) as a gene that has a low rate of benign missense variation and where pathogenic missense variants are a common mechanism of disease (PP2). In summary, this variant meets the criteria to be classified as uncertain significance for overgrowth syndrome and/or cerebral malformations due to abnormalities in MTOR pathway genes based on the ACMG/AMP criteria applied, as specified by the ClinGen BM VCEP: PP2 (ClinGen Brain Malformations VCEP Specifications Version 1.1).