BMPR2 c.1259G>A is a missense variant predicted to cause substitution of cysteine to tyrosine at amino acid position 420 (p.Cys420Tyr). The variant is absent from gnomAD v2.1.1 and v4.1 (PM2_supporting). A REVEL score of 0.924 meets PP3_supporting (>0.75). This variant resides within the conserved catalytic kinase domain but does not affect a known critical residue (PM1_moderate). The variant has been reported in four unrelated PAH probands (PMID: 15146475, 16429395, 21737554) with additional citations referring back to the same individuals (PMID: 21801371, 32634488, 30578397) (PS4_moderate). A different missense variant at the same amino acid residue, p.Cys420Arg (PMID: 11115378, 21801371) was previously classified by the PH VCEP as pathogenic (PM5_moderate). In summary, this variant meets the criteria to be classified as a likely pathogenic variant for pulmonary arterial hypertension based on the ACMG/AMP criteria applied, as specified by the ClinGen Pulmonary Hypertension VCEP: PS4_moderate, PM1_moderate, PM5_moderate, PM2_supporting, PP3_supporting (VCEP specification version 1.1, 1/18/2024).