rs773729410

Positions:

chr9-36236865-G-A

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PM5PP2PP3PP5_Very_Strong

The NM_005476.7(GNE):c.736C>T(p.Arg246Trp) variant causes a missense change. The variant allele was found at a frequency of 0.00000806 in 1,613,492 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 variant affecting the same amino acid position, but resulting in a different missense (i.e. R246Q) has been classified as Likely pathogenic.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000075 ( 0 hom. )

Consequence

GNE
NM_005476.7 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:8

Conservation

PhyloP100: 4.97

Variant links:

Genes affected

GNE (HGNC:23657): (glucosamine (UDP-N-acetyl)-2-epimerase/N-acetylmannosamine kinase) The protein encoded by this gene is a bifunctional enzyme that initiates and regulates the biosynthesis of N-acetylneuraminic acid (NeuAc), a precursor of sialic acids. It is a rate-limiting enzyme in the sialic acid biosynthetic pathway. Sialic acid modification of cell surface molecules is crucial for their function in many biologic processes, including cell adhesion and signal transduction. Differential sialylation of cell surface molecules is also implicated in the tumorigenicity and metastatic behavior of malignant cells. Mutations in this gene are associated with sialuria, autosomal recessive inclusion body myopathy, and Nonaka myopathy. Alternative splicing of this gene results in transcript variants encoding different isoforms. [provided by RefSeq, Jul 2008]

GNE links:

CLTA (HGNC:2090): (clathrin light chain A) Clathrin is a large, soluble protein composed of heavy and light chains. It functions as the main structural component of the lattice-type cytoplasmic face of coated pits and vesicles which entrap specific macromolecules during receptor-mediated endocytosis. This gene encodes one of two clathrin light chain proteins which are believed to function as regulatory elements. Alternative splicing results in multiple transcript variants. Related pseudogenes have been identified on chromosomes 8 and 12. [provided by RefSeq, May 2010]

CLTA links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 12 ACMG points.

PM5

Other missense variant is known to change same aminoacid residue: Variant chr9-36236864-C-T is described in Lovd as [Likely_pathogenic].

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), GNE. . Gene score misZ 2.5904 (greater than the threshold 3.09). Trascript score misZ 3.9915 (greater than threshold 3.09). GenCC has associacion of gene with macrothrombocytopenia, isolated, platelet-type bleeding disorder 19, sialuria, GNE myopathy.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.836

PP5

Variant 9-36236865-G-A is Pathogenic according to our data. Variant chr9-36236865-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 197184.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-36236865-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GNE	NM_001128227.3 linkuse as main transcript	c.829C>T	p.Arg277Trp	missense_variant	4/12	ENST00000396594.8	NP_001121699.1	Q9Y223-2
GNE	NM_005476.7 linkuse as main transcript	c.736C>T	p.Arg246Trp	missense_variant	4/12	ENST00000642385.2	NP_005467.1	Q9Y223-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GNE	ENST00000396594.8 linkuse as main transcript	c.829C>T	p.Arg277Trp	missense_variant	4/12	1	NM_001128227.3	ENSP00000379839.3		Q9Y223-2
GNE	ENST00000642385.2 linkuse as main transcript	c.736C>T	p.Arg246Trp	missense_variant	4/12		NM_005476.7	ENSP00000494141.2		Q9Y223-1

Frequencies

GnomAD3 genomes

AF:

0.0000131

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000119

AC:

AN:

251416

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135882

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000176

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000753

AC:

AN:

1461292

Hom.:

Cov.:

AF XY:

0.00000825

AC XY:

AN XY:

727002

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000720

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000131

AC:

AN:

152200

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74354

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000765

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.0000165

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

GNE myopathy

Pathogenic:4

Likely pathogenic, no assertion criteria provided	clinical testing	Counsyl	Sep 26, 2018	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Dec 10, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Dec 24, 2022	Variant summary: GNE c.829C>T (p.Arg277Trp) results in a non-conservative amino acid change located in the UDP-N-acetylglucosamine 2-epimerase domain (IPR003331) of 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 251416 control chromosomes. c.829C>T has been reported in the literature as biallelic homozygous or compound heterozygous genotypes in multiple individuals affected with features of Inclusion Body Myopathy/GNE myopathy (example, PMID: 26231298, 21307865, 29305133, 15987957, 20346669). These data indicate that the variant is very likely to be associated with disease. At least one publication reports experimental evidence evaluating an impact on protein function (example, PMID: 15987957). The most pronounced variant effect results in <2% of normal uridine diphosphate (UDP)-N-acetylglucosamine (GlcNAc) 2-epimerase (GNE) enzyme activity in-vitro. Five clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as pathogenic/likely pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Sep 16, 2020	- -

not provided

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Jun 28, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Sep 20, 2023	Published functional studies demonstrate that this variant leads to significantly reduced enzyme activity (Sparks et al., 2005); Missense variants in this gene are often considered pathogenic (HGMD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 22507750, 12409274, 25966635, 31589614, 30390020, 24796702, 20346669, 19917666, 26231298, 18555875, 25002140, 21307865, 17098358, 15987957, 36360228, 35248449, 35438352, 37066920) -
Pathogenic, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	May 19, 2016	- -

Sialuria;C1853926:GNE myopathy

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 01, 2024

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 277 of the GNE protein (p.Arg277Trp). This variant is present in population databases (rs773729410, gnomAD 0.004%). This missense change has been observed in individual(s) with autosomal recessive hereditary inclusion body myopathy (PMID: 26231298). 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: 197184). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on GNE protein function. Experimental studies have shown that this missense change affects GNE function (PMID: 15987957). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.26

BayesDel_addAF

Pathogenic

0.34

BayesDel_noAF

Pathogenic

0.33

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.97

D;.;D;.;.;D

Eigen

Uncertain

0.36

Eigen_PC

Uncertain

0.43

FATHMM_MKL

Uncertain

0.91

LIST_S2

Pathogenic

0.99

.;D;D;D;D;.

M_CAP

Pathogenic

0.73

MetaRNN

Pathogenic

0.84

D;D;D;D;D;D

MetaSVM

Pathogenic

1.1

MutationAssessor

Benign

1.0

L;.;L;.;L;L

PrimateAI

Pathogenic

0.85

PROVEAN

Uncertain

-3.0

.;D;D;.;D;D

REVEL

Pathogenic

0.80

Sift

Uncertain

0.0030

.;D;D;.;D;D

Sift4G

Uncertain

0.020

.;D;D;D;D;D

Polyphen

0.97

D;D;D;.;.;D

Vest4

0.65, 0.66, 0.69, 0.65

MVP

0.99

MPC

1.1

ClinPred

0.83

GERP RS

4.0

Varity_R

0.80

gMVP

0.80

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

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.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over