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X-Linked Glomerulopathy Due to COL4A5 Founder Variant. | LitMetric

X-Linked Glomerulopathy Due to COL4A5 Founder Variant.

Am J Kidney Dis

Division of Nephrology, University Health Network, Toronto, Canada; Toronto General Research Institute, Toronto General Hospital, Toronto, Canada; Department of Medicine, University of Toronto, Toronto, Canada; Institute of Medical Sciences, University of Toronto, Toronto, Canada.

Published: March 2018

AI Article Synopsis

Article Abstract

Alport syndrome is a rare hereditary disorder caused by rare variants in 1 of 3 genes encoding for type IV collagen. Rare variants in COL4A5 on chromosome Xq22 cause X-linked Alport syndrome, which accounts for ∼80% of the cases. Alport syndrome has a variable clinical presentation, including progressive kidney failure, hearing loss, and ocular defects. Exome sequencing performed in 2 affected related males with an undefined X-linked glomerulopathy characterized by global and segmental glomerulosclerosis, mesangial hypercellularity, and vague basement membrane immune complex deposition revealed a COL4A5 sequence variant, a substitution of a thymine by a guanine at nucleotide 665 (c.T665G; rs281874761) of the coding DNA predicted to lead to a cysteine to phenylalanine substitution at amino acid 222, which was not seen in databases cataloguing natural human genetic variation, including dbSNP138, 1000 Genomes Project release version 01-11-2004, Exome Sequencing Project 21-06-2014, or ExAC 01-11-2014. Review of the literature identified 2 additional families with the same COL4A5 variant leading to similar atypical histopathologic features, suggesting a unique pathologic mechanism initiated by this specific rare variant. Homology modeling suggests that the substitution alters the structural and dynamic properties of the type IV collagen trimer. Genetic analysis comparing members of the 3 families indicated a distant relationship with a shared haplotype, implying a founder effect.

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Source
http://dx.doi.org/10.1053/j.ajkd.2017.09.005DOI Listing

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