ClinVar Miner

Submissions for variant NM_000091.4(COL4A3):c.4793T>G (p.Leu1598Arg) (rs752452590)

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Total submissions: 3
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Submitter RCV SCV Clinical significance Condition Last evaluated Review status Method Comment
Counsyl RCV000665574 SCV000789720 likely pathogenic Alport syndrome, autosomal recessive 2017-02-14 criteria provided, single submitter clinical testing
Integrated Genetics/Laboratory Corporation of America RCV000665574 SCV000917259 likely pathogenic Alport syndrome, autosomal recessive 2019-07-01 criteria provided, single submitter clinical testing Variant summary: COL4A3 c.4793T>G (p.Leu1598Arg) results in a non-conservative amino acid change located in the Collagen IV, non-collagenous domain (IPR001442) of the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 5.6e-05 in 249436 control chromosomes (gnomAD). This frequency is not significantly higher than expected for a pathogenic variant in COL4A3 causing Alport Syndrome, autosomal recessive (5.6e-05 vs 0.002), allowing no conclusion about variant significance. c.4793T>G has been reported in the literature in at-least 5 individuals affected with autosomal recessive Alport Syndrome in compound heterozygosity (Oka_2014). These data indicate that the variant is likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. One other submitter has provided clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation and classified the variant as likely pathogenic. Based on the evidence outlined above, the variant was classified as likely pathogenic.
Invitae RCV000821858 SCV000962630 pathogenic not provided 2018-11-26 criteria provided, single submitter clinical testing This sequence change replaces leucine with arginine at codon 1598 of the COL4A3 protein (p.Leu1598Arg). The leucine residue is highly conserved and there is a moderate physicochemical difference between leucine and arginine. This variant is present in population databases (rs752452590, ExAC 0.05%). This variant has been observed on the opposite chromosome (in trans) from other pathogenic variants in individuals affected with COL4A3-related conditions (PMID: 24633401). This finding is consistent with autosomal recessive inheritance, and suggests that this variant contributes to disease. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). For these reasons, this variant has been classified as Pathogenic.

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