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• W4315703445 abstract "Introduction: Fibromuscular dysplasia (FMD) is a non-atherosclerotic arteriopathy of unknown etiology, afflicting mostly middle-aged women. It is characterized by stenotic lesions of the vascular wall in middle-size arteries, sometimes associated with dissection, aneurysm or tortuosity. Renovascular hypertension is a major presentation of FMD and 50–85% of FMD patients are hypertensive. Methods & Results: We report results from the first genome-wide association meta-analysis of six studies including 1556 FMD cases and 7100 controls. We identified four robustly associated loci (PHACTR1, LRP1, ATP2B1, and LIMA1). Using colocalization and transcriptome-wide association analysis with arterial expression datasets, we found PHACTR1, LRP1 and ATP2B1 as target genes at FMD loci and identified one additional locus (SLC24A3). We analysed chromatin accessibility in artery-derived primary cells and found that FMD associated variants were located in arterial specific regulatory elements active in smooth muscle cells. Target genes were broadly involved in mechanisms related to actin cytoskeleton and intracellular calcium homeostasis, central to vascular contraction. All FMD loci were also associated to at least one blood pressure trait. Colocalization analysis supported the same genetic variants to cause association to FMD and systolic blood pressure at PHACTR1, ATP2B1 and LIMA1 loci, and for FMD and pulse pressure at PHACTR1, LRP1 and ATP2B1 loci. Using genome-wide genetic correlation, we found a significant association between FMD and blood pressure. Mendelian Randomization analysis supported genetically determined systolic blood pressure to significantly increase the risk of FMD. However, we confirmed using adjusted and stratified analyses that hypertension status alone was not driving the association with FMD at top loci. We also report an important genetic overlap of FMD with migraine, intracranial aneurysm, coronary artery disease and myocardial infarction. Conclusion: Our study confirms FMD as a polygenic disease following a complex genetic mode of inheritance. We find that FMD shares an important part of its genetic basis with blood pressure regulation, involving in particular several genes related to intracellular calcium homeostasis and vascular smooth muscle contraction. These results are consistent with previous studies showing systemic alterations in vascular contraction in FMD patients, even outside of affected arterial beds. While the mechanisms through which FMD may cause renovascular hypertension are well known, further studies will be required to determine how alterations in vascular contraction may lead to the arterial remodeling observed in FMD." @default.
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• W4315703445 date "2023-01-01" @default.
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• W4315703445 title "S-22-4: GENOME WIDE ASSOCIATION STUDY OF FIBROMUSCULAR DYSPLASIA REVEALS MECHANISTIC LINKS WITH BLOOD PRESSURE REGULATION AND OTHER VASCULAR DISEASES" @default.
• W4315703445 doi "https://doi.org/10.1097/01.hjh.0000913240.04466.fb" @default.
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