chr9-36236864-C-G

Variant names:

• chr9-36236864-C-G
• rs121908629
• NM_001128227.3:c.830G>C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PM2 PM5 PP2 BP4

The NM_005476.7(GNE):​c.737G>C​(p.Arg246Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. 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: not found (cov: 32)
• Consequence: GNE NM_005476.7 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 1.43

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 Uncertain_significance. Variant got 4 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr9-36236864-C-T is described in Lovd as [Likely_pathogenic].
• PP2: Missense variant in the GNE gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 44 curated pathogenic missense variants (we use a threshold of 10). The gene has 1 curated benign missense variants. Gene score misZ: 2.5904 (below the threshold of 3.09). Trascript score misZ: 3.9915 (above the threshold of 3.09). GenCC associations: The gene is linked to macrothrombocytopenia, isolated, platelet-type bleeding disorder 19, sialuria, GNE myopathy.
• BP4: Computational evidence support a benign effect (MetaRNN=0.32625893).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
GNE	NM_001128227.3	c.830G>C	p.Arg277Pro	missense_variant	Exon 4 of 12	ENST00000396594.8	NP_001121699.1
GNE	NM_005476.7	c.737G>C	p.Arg246Pro	missense_variant	Exon 4 of 12	ENST00000642385.2	NP_005467.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
GNE	ENST00000396594.8	c.830G>C	p.Arg277Pro	missense_variant	Exon 4 of 12	1	NM_001128227.3	ENSP00000379839.3
GNE	ENST00000642385.2	c.737G>C	p.Arg246Pro	missense_variant	Exon 4 of 12		NM_005476.7	ENSP00000494141.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

Bravo AF: 0.0000113

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.21
BayesDel_addAF	Pathogenic	0.27	D
BayesDel_noAF	Pathogenic	0.15
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.75	D;.;D;.;.;D
Eigen	Benign	-0.14
Eigen_PC	Benign	0.12
FATHMM_MKL	Uncertain	0.88	D
LIST_S2	Uncertain	0.94	.;D;D;D;D;.
M_CAP	Pathogenic	0.50	D
MetaRNN	Benign	0.33	T;T;T;T;T;T
MetaSVM	Uncertain	0.73	D
MutationAssessor	Benign	-0.55	N;.;N;.;N;N
PrimateAI	Pathogenic	0.82	D
PROVEAN	Benign	-0.27	.;N;N;.;N;N
REVEL	Uncertain	0.48
Sift	Benign	0.15	.;T;T;.;T;T
Sift4G	Benign	0.28	.;T;T;T;T;T
Polyphen		0.0080	B;B;B;.;.;B
Vest4		0.83, 0.83, 0.80, 0.81
MVP		0.98
MPC		0.78
ClinPred		0.54	D
GERP RS		6.0
Varity_R		0.54
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

Other links and lift over

dbSNP: rs121908629; hg19: chr9-36236861;