rs753961807

chr2-74465183-G-Cchr2-74465183-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM2 PM5 BP4_Moderate

The NM_006302.3(MOGS):c.65C>G(p.Ala22Gly) 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. 12/21 in silico tools predict 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. A22E) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 33)
• Consequence: MOGS NM_006302.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.852

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 Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr2-74465183-G-T is described in Lovd as [Pathogenic].
• BP4: Computational evidence support a benign effect (MetaRNN=0.0760251).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
MOGS	NM_006302.3	c.65C>G	p.Ala22Gly	missense_variant	1/4	ENST00000448666.7
MOGS	NM_001146158.2	c.-59+131C>G		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
MOGS	ENST00000448666.7	c.65C>G	p.Ala22Gly	missense_variant	1/4	1	NM_006302.3	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.069
BayesDel_addAF	Benign	-0.27	T
BayesDel_noAF	Benign	-0.63
Cadd	Benign	14
Dann	Uncertain	0.99
DEOGEN2	Benign	0.0044	T;T;T;.;.
Eigen	Benign	-0.85
Eigen_PC	Benign	-0.76
FATHMM_MKL	Benign	0.15	N
M_CAP	Uncertain	0.097	D
MetaRNN	Benign	0.076	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N;N;.;.;.
MutationTaster	Benign	1.0	D;N;N;N
PrimateAI	Pathogenic	0.85	D
Polyphen		0.0010	B;B;.;.;.
Vest4		0.092, 0.093
MutPred		0.19		Loss of helix (P = 0.0033);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		0.25
MPC		0.25
ClinPred		0.086	T
GERP RS		1.4
Varity_R		0.066
gMVP		0.71

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs753961807; hg19: chr2-74692310;