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• W2171664141 endingPage "L554" @default.
• W2171664141 startingPage "L541" @default.
• W2171664141 abstract "Most patients with familial pulmonary arterial hypertension (FPAH) carry mutations in the bone morphogenic protein receptor 2 gene ( BMPR2). Yet carriers have only a 20% risk of disease, suggesting that other factors influence penetrance. Thrombospondin-1 (TSP1) regulates activation of TGF-β and inhibits endothelial and smooth muscle cell proliferation, pathways coincidentally altered in pulmonary arterial hypertension (PAH). To determine whether a subset of FPAH patients also have mutations in the TSP1 gene ( THBS1) we resequenced the type I repeats of THBS1 encoding the TGF-β regulation and cell growth inhibition domains in 60 FPAH probands, 70 nonfamilial PAH subjects, and in large control groups. We identified THBS1 mutations in three families: a novel missense mutation in two (Asp362Asn), and an intronic mutation in a third (IVS8+255 G/A). Neither mutation was detected in population controls. Mutant 362Asn TSP1 had less than half of the ability of wild-type TSP1 to activate TGF-β. Mutant 362Asn TSP1 also lost the ability to inhibit growth of pulmonary arterial smooth muscle cells and was over threefold less effective at inhibiting endothelial cell growth. The IVS8+255 G/A mutation decreased and/or eliminated local binding of the transcription factors SP1 and MAZ but did not affect RNA splicing. These novel mutations implicate THBS1 as a modifier gene in FPAH. These THBS1 mutations have implications in the genetic evaluation of FPAH patients. However, since FPAH is rare, these data are most relevant as evidence for the importance of TSP1 in pulmonary vascular homeostasis. Further examination of THBS1 in the pathogenesis of PAH is warranted." @default.
• W2171664141 created "2016-06-24" @default.
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• W2171664141 date "2012-03-15" @default.
• W2171664141 modified "2023-09-25" @default.
• W2171664141 title "Loss-of-function thrombospondin-1 mutations in familial pulmonary hypertension" @default.
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• W2171664141 doi "https://doi.org/10.1152/ajplung.00282.2011" @default.
• W2171664141 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3311532" @default.
• W2171664141 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22198906" @default.
• W2171664141 hasPublicationYear "2012" @default.
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