MAPPING OF FAMILIAL PRIMARY PULMONARY-HYPERTENSION LOCUS (PPH1) TO CHROMOSOME 2Q31-Q32

Background The pathogenesis of primary pulmonary hypertension (PPH) is unknown, although in some instances families with multiple affected m embers suggest a genetic etiology. Methods and Results We used microsa tellite markers and linkage analysis in a large family with PPH to det ermine the chromosomal location of their disease gene. We tested a sec ond, ethnically distinct, family for cosegregation of disease with mar kers from the linked region. We mapped the disease locus PPH1; GDB/HUG O designation (GDB:1381541; July 1996), approved when this work was ac cepted for publication in abstract form (Circulation. 1996;94[suppl I] :I-49.), in these maximum lod score of 3.87 associated with markers D2 S350 and D2S364. Conclusions Cosegregation of this region with disease in different ethnic groups suggests that we mapped an important locus in familial PPH. Careful study of additional families and sporadic ca ses will be required to confirm this localization of PPH1 and characte rize its overall role.