2-74461313-T-C

Variant summary

Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2 PP3_Strong

The NM_006302.3(MOGS):c.2476A>G(p.Thr826Ala) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 33)
• Consequence: MOGS NM_006302.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.73

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_pathogenic. Variant got 6 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.939

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MOGS	NM_006302.3	c.2476A>G	p.Thr826Ala	missense_variant	4/4	ENST00000448666.7
MOGS	NM_001146158.2	c.2158A>G	p.Thr720Ala	missense_variant	5/5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MOGS	ENST00000448666.7	c.2476A>G	p.Thr826Ala	missense_variant	4/4	1	NM_006302.3	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

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

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

Feb 15, 2018

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. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with MOGS-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces threonine with alanine at codon 826 of the MOGS protein (p.Thr826Ala). The threonine residue is moderately conserved and there is a small physicochemical difference between threonine and alanine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.62
BayesDel_addAF	Uncertain	0.090	D
BayesDel_noAF	Benign	-0.11
Cadd	Uncertain	26
Dann	Uncertain	1.0
DEOGEN2	Benign	0.038	T;T;.;.;.
Eigen	Uncertain	0.59
Eigen_PC	Uncertain	0.56
FATHMM_MKL	Uncertain	0.94	D
M_CAP	Benign	0.042	D
MetaRNN	Pathogenic	0.94	D;D;D;D;D
MetaSVM	Benign	-0.51	T
MutationAssessor	Pathogenic	3.0	M;M;.;.;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Benign	0.40	T
Polyphen		0.91	P;P;.;.;.
Vest4		0.46, 0.47
MutPred		0.93		Gain of catalytic residue at T826 (P = 0.2575);Gain of catalytic residue at T826 (P = 0.2575);.;.;.;
MVP		0.83
MPC		0.74
ClinPred		0.97	D
GERP RS		4.8
Varity_R		0.16
gMVP		0.86

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: rs1558564232; hg19: chr2-74688440;