In Silico Analysis of Novel VHL Germline Mutations in Iranian RCH Patients
Naseripour, M.; Bagherzade, K.; Khakpoor, G.; Sedaghat, A.; Mirshahi, R.; Kasraee, H.; Kiaee, R. A.; Azimi, F.
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Von Hippel-Lindau (VHL) syndrome is an autosomal dominant inherited multisystem neoplasia disorder caused by the VHL tumor suppressor gene, coding for VHL protein (pVHL), variants. Various types of VHL variants present different clinical phenotypes that later lead to events resulting in benign or malignant lesions including Retinal Capillary Hemangioblastoma (RCH). We reported on 3 novel mutation sites observed in 3 families (5 RCH patients), including c.511A>C, c.514C>T, and c.511A>T in exon 3 of the VHL gene. According to the ACMG classifications, c.514C>T and c.511A>T variations are likely pathogenic, and c.511A>C is a variant of uncertain significance (VUS) and in accordance with autosomal dominant inheritance. The location and impact of the incidence mutations on pVHL were computed using in silico analysis. The obtained structural information and computational analysis showed that the studied mutations induce conformational changes that limit the flexibility of the pVHL interaction interface with elonginB/C, elongin C/B, and cullin2, which is necessary for HIF1 alpha binding. The recently added gene variants and their related clinical phenotypes will improve the VHL diagnosis accuracy and the patients population carrying VHL gene mutations. These pioneering results could be a model for future functional studies.
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