2-74462765-G-C

Variant names:

• chr2-74462765-G-C
• rs893214845
• NM_006302.3:c.1024C>G

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_006302.3(MOGS):​c.1024C>G​(p.Gln342Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,890 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: MOGS NM_006302.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.555

Genes affected

MOGS (HGNC:24862): (mannosyl-oligosaccharide glucosidase) This gene encodes the first enzyme in the N-linked oligosaccharide processing pathway. The enzyme cleaves the distal alpha-1,2-linked glucose residue from the Glc(3)-Man(9)-GlcNAc(2) oligosaccharide precursor. This protein is located in the lumen of the endoplasmic reticulum. Defects in this gene are a cause of type IIb congenital disorder of glycosylation (CDGIIb). Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Mar 2009]

ACMG classification

Verdict is Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.044078678).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
MOGS	NM_006302.3	c.1024C>G	p.Gln342Glu	missense_variant	Exon 4 of 4	ENST00000448666.7	NP_006293.2
MOGS	NM_001146158.2	c.706C>G	p.Gln236Glu	missense_variant	Exon 5 of 5		NP_001139630.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
MOGS	ENST00000448666.7	c.1024C>G	p.Gln342Glu	missense_variant	Exon 4 of 4	1	NM_006302.3	ENSP00000410992.3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461890 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727246

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: 0.00000360

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

MOGS-congenital disorder of glycosylation Uncertain:1

Sep 27, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant has not been reported in the literature in individuals affected with MOGS-related conditions. This sequence change replaces glutamine, which is neutral and polar, with glutamic acid, which is acidic and polar, at codon 342 of the MOGS protein (p.Gln342Glu). This variant is not present in population databases (gnomAD no frequency). ClinVar contains an entry for this variant (Variation ID: 574538). 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 not expected to disrupt MOGS protein function. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.070
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.60
CADD	Benign	7.5
DANN	Benign	0.75
DEOGEN2	Benign	0.0023	T;T;.;.;.;.
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.0
FATHMM_MKL	Benign	0.26	N
LIST_S2	Benign	0.73	.;T;.;T;T;T
M_CAP	Benign	0.0044	T
MetaRNN	Benign	0.044	T;T;T;T;T;T
MetaSVM	Benign	-0.97	T
MutationAssessor	Benign	0.52	N;N;.;.;.;.
PrimateAI	Benign	0.23	T
PROVEAN	Benign	0.030	.;N;.;.;N;.
REVEL	Benign	0.043
Sift	Benign	0.29	.;T;.;.;T;.
Sift4G	Benign	0.93	.;T;.;.;T;.
Polyphen		0.0040	B;B;.;.;.;.
Vest4		0.046, 0.048
MutPred		0.34		Gain of phosphorylation at S340 (P = 0.0895);Gain of phosphorylation at S340 (P = 0.0895);.;.;.;.;
MVP		0.27
MPC		0.26
ClinPred		0.043	T
GERP RS		1.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.060
gMVP		0.41

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.080		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: rs893214845; hg19: chr2-74689892;