The c.1202T>C (p.Leu401Ser) variant is a missense variant harboured in exon 9 of the BMPR2 gene, predicted to cause substitution of leucine to serine encoding the functionally relevant catalytic kinase domain but without functional evidence indicating either critical or non-critical amino acid residue (PM1_moderate). This variant is absent from gnomAD v2.1.1 (controls) and v4.1 (PM2_supporting). The REVEL prediction algorithm score is 0.72, below the PH VCEP threshold of >=0.75 for pathogenicity but above the threshold of <=0.25 for benignity (PP3 and BP4 not met). The variant has been identified in a single individual with hereditary PAH, included in two reports (PMID: 32581362 and PMID: 16429395) (PS4 not met). The variant was paternally inherited (PS2 not met). Functional studies have not been conducted for this variant (PS3 not assessed). In summary, this variant meets the criteria to be classified as a variant of unknown significance for pulmonary arterial hypertension based on the ACMG/AMP criteria applied, as specified by the ClinGen Pulmonary Hypertension VCEP: PM1_moderate, PM2_supporting, PP3_not met (VCEP specification version 1.1.0, 1/18/2024)