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• W2967687315 abstract "Abstract Hereditary Hemorrhagic Telangiectasia (HHT) is a Mendelian disease characterized by vascular malformations including visceral arteriovenous malformations and mucosal telangiectasia. HHT is caused by loss-of-function mutations in one of 3 genes; ENG , ACVRL1 or SMAD4 and is inherited as an autosomal dominant condition. Intriguingly, the constitutional mutation causing HHT is present throughout the body, yet the multiple vascular malformations in HHT patients occur focally, rather than manifesting as a systemic vascular defect. This disconnect between genotype and phenotype suggests that a local event is necessary for the development of vascular malformations. We investigated the hypothesis that local somatic mutations seed the formation HHT-related telangiectasia in a genetic two-hit mechanism. We identified low-frequency somatic mutations in 9/19 telangiectasia using high depth next-generation sequencing. We established phase for 7 of 9 samples using long-read sequencing, which confirm that the germline and somatic mutations in all 7 samples exist in trans configuration; consistent with a genetic two-hit mechanism. These combined data suggest that biallelic loss of ENG or ACVRL1 may be a required event in the development of telangiectasia, and that rather than haploinsufficiency, vascular malformations in HHT are caused by a Knudsonian two-hit mechanism." @default.
• W2967687315 created "2019-08-22" @default.
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• W2967687315 date "2019-08-10" @default.
• W2967687315 modified "2023-09-26" @default.
• W2967687315 title "Somatic Mutations in Vascular Malformations of Hereditary Hemorrhagic Telangiectasia Result in Biallelic Loss of ENG or ACVRL1" @default.
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• W2967687315 doi "https://doi.org/10.1101/731588" @default.
• W2967687315 hasPublicationYear "2019" @default.
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