11-119097017-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001382.4(DPAGT1):c.1208G>A(p.Arg403Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000452 in 1,613,988 control chromosomes in the GnomAD database, including 1 homozygotes. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency:
  • Genomes: 𝑓 0.000013 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000049 (1 hom.)
• Consequence: DPAGT1 NM_001382.4 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:2
• Conservation: PhyloP100: 7.35

Genes affected

DPAGT1 (HGNC:2995): (dolichyl-phosphate N-acetylglucosaminephosphotransferase 1) The protein encoded by this gene is an enzyme that catalyzes the first step in the dolichol-linked oligosaccharide pathway for glycoprotein biosynthesis. This enzyme belongs to the glycosyltransferase family 4. This protein is an integral membrane protein of the endoplasmic reticulum. The congenital disorder of glycosylation type Ij is caused by mutation in the gene encoding this enzyme. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DPAGT1	NM_001382.4	c.1208G>A	p.Arg403Gln	missense_variant	9/9	ENST00000354202.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DPAGT1	ENST00000354202.9	c.1208G>A	p.Arg403Gln	missense_variant	9/9	1	NM_001382.4	P1

Frequencies

GnomAD3 genomes AF: 0.0000131 AC: 2 AN: 152114 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000241

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000147

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000119 AC: 3 AN: 251310 Hom.: 0 AF XY: 0.0000221 AC XY: 3 AN XY: 135844

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000176

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.0000486 AC: 71 AN: 1461874 Hom.: 1 Cov.: 30 AF XY: 0.0000440 AC XY: 32 AN XY: 727234

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000232

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000612

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.0000131 AC: 2 AN: 152114 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74308

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000147

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000142 Hom.: 0

Bravo AF: 0.0000189

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

DPAGT1-congenital disorder of glycosylation;C3553645:Congenital myasthenic syndrome 13 Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Invitae

May 09, 2022

This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 403 of the DPAGT1 protein (p.Arg403Gln). This variant is present in population databases (no rsID available, gnomAD 0.003%). This variant has not been reported in the literature in individuals affected with DPAGT1-related conditions. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). 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. -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 26, 2023

The c.1208G>A (p.R403Q) alteration is located in exon 9 (coding exon 9) of the DPAGT1 gene. This alteration results from a G to A substitution at nucleotide position 1208, causing the arginine (R) at amino acid position 403 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Pathogenic	0.20	D
BayesDel_noAF	Uncertain	0.11
Cadd	Benign	23
Dann	Uncertain	1.0
DEOGEN2	Benign	0.15	T;T;.
Eigen	Benign	0.17
Eigen_PC	Uncertain	0.35
FATHMM_MKL	Pathogenic	1.0	D
M_CAP	Uncertain	0.16	D
MetaRNN	Uncertain	0.53	D;D;D
MetaSVM	Uncertain	0.18	D
MutationAssessor	Uncertain	2.2	M;M;.
MutationTaster	Benign	1.0	D;D;D
PrimateAI	Uncertain	0.76	T
PROVEAN	Benign	-0.24	N;N;.
REVEL	Uncertain	0.44
Sift	Benign	0.31	T;T;.
Sift4G	Benign	0.41	T;T;.
Polyphen		0.33	B;B;.
Vest4		0.66
MutPred		0.49		Loss of MoRF binding (P = 0.0021);Loss of MoRF binding (P = 0.0021);.;
MVP		0.96
MPC		1.1
ClinPred		0.65	D
GERP RS		5.6
Varity_R		0.42
gMVP		0.62

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.070		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: rs896612042; hg19: chr11-118967727;