rs28934274

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PS1_ModeratePM1PM2PP3_StrongPP5_Very_Strong

The ENST00000307363.10(GLB1):​c.367G>A​(p.Gly123Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000752 in 1,461,836 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 12/19 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin UniProt.

Frequency

Genomes: not found (cov: 32)
Exomes 𝑓: 0.0000075 ( 0 hom. )

Consequence

GLB1
ENST00000307363.10 missense

Scores

16
1

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:4

Conservation

PhyloP100: 7.83
Variant links:
Genes affected
GLB1 (HGNC:4298): (galactosidase beta 1) This gene encodes a member of the glycosyl hydrolase 35 family of proteins. Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein that is proteolytically processed to generate the mature lysosomal enzyme. This enzyme catalyzes the hydrolysis of a terminal beta-linked galactose residue from ganglioside substrates and other glycoconjugates. Mutations in this gene may result in GM1-gangliosidosis and Morquio B syndrome. [provided by RefSeq, Nov 2015]

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 18 ACMG points.

PS1
Transcript ENST00000307363.10 (GLB1) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in UniProt
PM1
In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 5 uncertain in ENST00000307363.10
PM2
Very rare variant in population databases, with high coverage;
PP3
MetaRNN computational evidence supports a deleterious effect, 0.977
PP5
Variant 3-33068849-C-T is Pathogenic according to our data. Variant chr3-33068849-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 928.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect #exon/exons MANE Protein UniProt
GLB1NM_000404.4 linkuse as main transcriptc.367G>A p.Gly123Arg missense_variant 3/16 ENST00000307363.10 NP_000395.3

Ensembl

Gene Transcript HGVSc HGVSp Effect #exon/exons TSL MANE Protein Appris UniProt
GLB1ENST00000307363.10 linkuse as main transcriptc.367G>A p.Gly123Arg missense_variant 3/161 NM_000404.4 ENSP00000306920 P2

Frequencies

GnomAD3 genomes
Cov.:
32
GnomAD3 exomes
AF:
0.00000802
AC:
2
AN:
249506
Hom.:
0
AF XY:
0.0000148
AC XY:
2
AN XY:
135360
show subpopulations
Gnomad AFR exome
AF:
0.00
Gnomad AMR exome
AF:
0.00
Gnomad ASJ exome
AF:
0.00
Gnomad EAS exome
AF:
0.00
Gnomad SAS exome
AF:
0.0000327
Gnomad FIN exome
AF:
0.00
Gnomad NFE exome
AF:
0.00000883
Gnomad OTH exome
AF:
0.00
GnomAD4 exome
AF:
0.00000752
AC:
11
AN:
1461836
Hom.:
0
Cov.:
32
AF XY:
0.00000688
AC XY:
5
AN XY:
727220
show subpopulations
Gnomad4 AFR exome
AF:
0.00
Gnomad4 AMR exome
AF:
0.00
Gnomad4 ASJ exome
AF:
0.00
Gnomad4 EAS exome
AF:
0.00
Gnomad4 SAS exome
AF:
0.0000116
Gnomad4 FIN exome
AF:
0.00
Gnomad4 NFE exome
AF:
0.00000899
Gnomad4 OTH exome
AF:
0.00
GnomAD4 genome
Cov.:
32
Bravo
AF:
0.00000378
Asia WGS
AF:
0.000866
AC:
3
AN:
3478
EpiCase
AF:
0.000109
EpiControl
AF:
0.00

ClinVar

Significance: Pathogenic
Submissions summary: Pathogenic:4
Revision: criteria provided, multiple submitters, no conflicts
LINK: link

Submissions by phenotype

Mucopolysaccharidosis, MPS-IV-B Pathogenic:1
Pathogenic, criteria provided, single submitterclinical testingWomen's Health and Genetics/Laboratory Corporation of America, LabCorpOct 22, 2024Variant summary: GLB1 c.367G>A (p.Gly123Arg) results in a non-conservative amino acid change in 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 8e-06 in 249506 control chromosomes. c.367G>A has been reported in the literature in individuals affected with Mucopolysaccharidosis Type IVB (Morquio Syndrome B) (examples: Caciotti_2007, Yoshida_1991, Sohn_2012, Lee_2014). These data indicate that the variant is likely to be associated with disease. In vitro functional studies reduced activity for the variant (Yoshida_1991). The following publications have been ascertained in the context of this evaluation (PMID: 17221873, 1907800, 22371915, 25326637). ClinVar contains an entry for this variant (Variation ID: 928). Based on the evidence outlined above, the variant was classified as pathogenic. -
not provided Pathogenic:1
Pathogenic, criteria provided, single submitterclinical testingGeneDxDec 13, 2022Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 25364648, 1907800, 32071837, Cho2021[Review], 30665703, 33240792, 31367523, 22371915, 25936995, 30548430, 17221873) -
GM1 gangliosidosis;C0086652:Mucopolysaccharidosis, MPS-IV-B Pathogenic:1
Pathogenic, criteria provided, single submitterclinical testingLabcorp Genetics (formerly Invitae), LabcorpDec 09, 2023This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 123 of the GLB1 protein (p.Gly123Arg). This variant is present in population databases (rs28934274, gnomAD 0.003%). This missense change has been observed in individual(s) with GLB1-related conditions (PMID: 1907800, 17221873, 22371915, 25936995). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 928). 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 with a positive predictive value of 95%. Experimental studies have shown that this missense change affects GLB1 function (PMID: 1907800). For these reasons, this variant has been classified as Pathogenic. -
Infantile GM1 gangliosidosis Pathogenic:1
Pathogenic, no assertion criteria providedliterature onlyOMIMAug 01, 1991- -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
0.95
BayesDel_addAF
Pathogenic
0.51
D
BayesDel_noAF
Pathogenic
0.59
CADD
Pathogenic
30
DANN
Pathogenic
1.0
Eigen
Pathogenic
0.90
Eigen_PC
Pathogenic
0.71
FATHMM_MKL
Pathogenic
0.98
D
LIST_S2
Pathogenic
1.0
.;.;D
M_CAP
Pathogenic
0.79
D
MetaRNN
Pathogenic
0.98
D;D;D
MetaSVM
Pathogenic
0.97
D
MutationTaster
Benign
1.0
A;A;A;A
PrimateAI
Pathogenic
0.84
D
PROVEAN
Pathogenic
-7.6
D;D;D
REVEL
Pathogenic
0.98
Sift
Pathogenic
0.0
D;D;D
Sift4G
Pathogenic
0.0010
D;D;.
Vest4
0.99
MutPred
0.97
Gain of sheet (P = 0.0827);.;.;
MVP
0.97
MPC
0.95
ClinPred
1.0
D
GERP RS
4.0
RBP_binding_hub_radar
0.97
RBP_regulation_power_radar
2.8
gMVP
1.0

Splicing

Name
Calibrated prediction
Score
Prediction
SpliceAI score (max)
0.020
Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Other links and lift over

dbSNP: rs28934274; hg19: chr3-33110341; COSMIC: COSV105136809; COSMIC: COSV105136809; API