rs121908626

Positions:

chr9-36218225-C-T

Variant summary

Our verdict is Pathogenic. Variant got 17 ACMG points: 17P and 0B. PM2PM5PP2PP3_StrongPP5_Very_Strong

The NM_001128227.3(GNE):c.1984G>A(p.Ala662Thr) variant causes a missense change. The variant allele was found at a frequency of 0.0000031 in 1,613,930 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. A662V) has been classified as Pathogenic.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

GNE
NM_001128227.3 missense

Scores

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 4.74

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 17 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PM5

Other missense variant is known to change same aminoacid residue: Variant chr9-36218224-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 6035.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

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 4.032 (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, 0.989

PP5

Variant 9-36218225-C-T is Pathogenic according to our data. Variant chr9-36218225-C-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 6027.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr9-36218225-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
GNE	NM_001128227.3 linkuse as main transcript	c.1984G>A	p.Ala662Thr	missense_variant	11/12	ENST00000396594.8
GNE	NM_005476.7 linkuse as main transcript	c.1891G>A	p.Ala631Thr	missense_variant	11/12	ENST00000642385.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
GNE	ENST00000396594.8 linkuse as main transcript	c.1984G>A	p.Ala662Thr	missense_variant	11/12	1	NM_001128227.3		Q9Y223-2
GNE	ENST00000642385.2 linkuse as main transcript	c.1891G>A	p.Ala631Thr	missense_variant	11/12		NM_005476.7	P1	Q9Y223-1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152128

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000724

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:

0.00

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1461802

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

727204

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152128

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74322

show subpopulations

Gnomad4 AFR

AF:

0.0000724

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:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

GNE myopathy

Pathogenic:2

Pathogenic, no assertion criteria provided	literature only	OMIM	Sep 01, 2001	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Dec 06, 2023	- -

Sialuria;C1853926:GNE myopathy

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Invitae

Sep 24, 2023

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 662 of the GNE protein (p.Ala662Thr). This variant is present in population databases (rs121908626, gnomAD 0.01%). This missense change has been observed in individuals with clinical features of autosomal recessive inclusion body myopathy (PMID: 11528398, 18555875). This variant is also known as A631T. ClinVar contains an entry for this variant (Variation ID: 6027). 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: 16503651). This variant disrupts the p.Ala662 amino acid residue in GNE. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 14707127, 22196754, 24695763). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.23

BayesDel_addAF

Pathogenic

0.54

BayesDel_noAF

Pathogenic

0.54

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Pathogenic

0.85

D;.;D;.;.;.;D

Eigen

Pathogenic

0.80

Eigen_PC

Pathogenic

0.76

FATHMM_MKL

Uncertain

0.92

LIST_S2

Uncertain

0.97

.;D;D;D;D;D;.

M_CAP

Pathogenic

0.73

MetaRNN

Pathogenic

0.99

D;D;D;D;D;D;D

MetaSVM

Pathogenic

0.99

MutationAssessor

Pathogenic

3.2

M;.;M;.;.;.;M

MutationTaster

Benign

1.0

A;A;A;A;A;A

PrimateAI

Uncertain

0.77

PROVEAN

Benign

-0.93

.;N;N;.;N;N;N

REVEL

Pathogenic

0.84

Sift

Pathogenic

0.0

.;D;D;.;D;D;D

Sift4G

Uncertain

0.0080

.;D;D;D;D;D;D

Polyphen

1.0

D;D;D;.;.;.;D

Vest4

0.89, 0.91, 0.85, 0.80, 0.79, 0.91

MutPred

0.96

Loss of stability (P = 0.0893);.;Loss of stability (P = 0.0893);.;.;.;Loss of stability (P = 0.0893);

MVP

0.99

MPC

1.1

ClinPred

0.99

GERP RS

5.6

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.84

gMVP

0.88

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