rs1554660119

Positions:

• chr9-36229099-A-C

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PM5 PP2 PP3_Moderate

The NM_005476.7(GNE):​c.992T>G​(p.Val331Gly) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000692 in 1,445,706 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 Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V331A) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 31)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: GNE NM_005476.7 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 8.36

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]

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]

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a strand (size 4) in uniprot entity GLCNE_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_005476.7
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.
• 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, 0.927

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
GNE	NM_001128227.3	c.1085T>G	p.Val362Gly	missense_variant	6/12	ENST00000396594.8	NP_001121699.1
GNE	NM_005476.7	c.992T>G	p.Val331Gly	missense_variant	6/12	ENST00000642385.2	NP_005467.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
GNE	ENST00000396594.8	c.1085T>G	p.Val362Gly	missense_variant	6/12	1	NM_001128227.3	ENSP00000379839.3
GNE	ENST00000642385.2	c.992T>G	p.Val331Gly	missense_variant	6/12		NM_005476.7	ENSP00000494141.2

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome AF: 6.92e-7 AC: 1 AN: 1445706 Hom.: 0 Cov.: 27 AF XY: 0.00 AC XY: 0 AN XY: 720398

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.11e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

GNE myopathy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Counsyl

Jun 01, 2018

- -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Mayo Clinic Laboratories, Mayo Clinic

Jul 16, 2024

PP3, PM2, PM5 -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.56	D
BayesDel_noAF	Pathogenic	0.57
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.99	D;.;D;.;.;.;D
Eigen	Pathogenic	0.89
Eigen_PC	Pathogenic	0.85
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.93	.;D;D;D;D;D;.
M_CAP	Pathogenic	0.91	D
MetaRNN	Pathogenic	0.93	D;D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Uncertain	2.9	M;.;M;.;.;M;M
PrimateAI	Uncertain	0.75	T
PROVEAN	Pathogenic	-6.1	.;D;D;.;D;D;D
REVEL	Pathogenic	0.98
Sift	Pathogenic	0.0	.;D;D;.;D;D;D
Sift4G	Uncertain	0.0020	.;D;D;D;D;D;D
Polyphen		1.0	D;D;D;.;.;.;D
Vest4		0.86, 0.88, 0.85, 0.65, 0.63
MutPred		0.69		Loss of helix (P = 0.0033);.;Loss of helix (P = 0.0033);.;.;Loss of helix (P = 0.0033);Loss of helix (P = 0.0033);
MVP		1.0
MPC		1.7
ClinPred		0.99	D
GERP RS		5.6
Varity_R		0.99
gMVP		0.98

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

Other links and lift over

dbSNP: rs1554660119; hg19: chr9-36229096;