rs28934886
Variant summary
Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PS1_ModeratePM2PP3_ModeratePP5_Very_Strong
The NM_000404.4(GLB1):c.1370G>A(p.Arg457Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000681 in 1,614,096 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another nucleotide change resulting in the same amino acid substitution has been previously reported as Likely pathogenic in UniProt.
Frequency
Consequence
NM_000404.4 missense
Scores
Clinical Significance
Conservation
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ACMG classification
Verdict is Pathogenic. Variant got 14 ACMG points.
Transcripts
RefSeq
Ensembl
Frequencies
GnomAD3 genomes AF: 0.00000657 AC: 1AN: 152186Hom.: 0 Cov.: 32
GnomAD3 exomes AF: 0.0000120 AC: 3AN: 249530Hom.: 0 AF XY: 0.0000148 AC XY: 2AN XY: 135368
GnomAD4 exome AF: 0.00000684 AC: 10AN: 1461792Hom.: 0 Cov.: 31 AF XY: 0.00000825 AC XY: 6AN XY: 727196
GnomAD4 genome AF: 0.00000657 AC: 1AN: 152304Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0AN XY: 74476
ClinVar
Submissions by phenotype
GM1 gangliosidosis type 3 Pathogenic:1
Pathogenic, no assertion criteria provided | literature only | OMIM | Aug 01, 1991 | - - |
Infantile GM1 gangliosidosis;C0268272:GM1 gangliosidosis type 2;C0268273:GM1 gangliosidosis type 3 Pathogenic:1
Likely pathogenic, criteria provided, single submitter | clinical testing | Myriad Genetics, Inc. | Nov 16, 2021 | NM_000404.2(GLB1):c.1370G>A(R457Q) is a missense variant classified as likely pathogenic in the context of GLB1-related disorders. R457Q has been observed in cases with relevant disease (PMID: 31761138, 1353343, 16617000). Functional assessments of this variant are available in the literature (PMID: 1907800, 16617000). R457Q has been observed in population frequency databases (gnomAD: SAS 0.02%). In summary, NM_000404.2(GLB1):c.1370G>A(R457Q) is a missense variant that has functional support for pathogenicity and has been observed more frequently in cases with the relevant disease than in healthy populations. Please note: this variant was assessed in the context of healthy population screening. - |
GM1 gangliosidosis;C0086652:Mucopolysaccharidosis, MPS-IV-B Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Nov 07, 2022 | This missense change has been observed in individual(s) with GM1-gangliosidosis (PMID: 1907800, 16617000, 31761138). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. It has also been observed to segregate with disease in related individuals. This variant is present in population databases (rs28934886, gnomAD 0.003%). This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 457 of the GLB1 protein (p.Arg457Gln). This variant is also known as 1404G>A. For these reasons, this variant has been classified as Pathogenic. Experimental studies have shown that this missense change affects GLB1 function (PMID: 1907800, 11504597). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt GLB1 protein function. ClinVar contains an entry for this variant (Variation ID: 930). - |
GM1 gangliosidosis Pathogenic:1
Pathogenic, criteria provided, single submitter | clinical testing | Women's Health and Genetics/Laboratory Corporation of America, LabCorp | Aug 16, 2022 | Variant summary: GLB1 c.1370G>A (p.Arg457Gln) results in a conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 1.2e-05 in 249530 control chromosomes (gnomAD). c.1370G>A has been reported in the literature as a biallelic genotype in individuals affected with GM1 Gangliosidosis (e.g. Yoshida_1991, Iwasaki_2006, Arash-Kaps_2019). These data indicate that the variant is likely to be associated with disease. When transfected into GLB1-null cells, the variant protein showed greater than 150-fold reduction in beta-Galactosidase activity compared to wild-type (Yoshida_1991). Two ClinVar submitters have assessed the variant since 2014: both classified the variant as likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. - |
Computational scores
Source:
Splicing
Find out detailed SpliceAI scores and Pangolin per-transcript scores at