chr1-20654663-G-A

Variant names:

Variant summary

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

The NM_005216.5(DDOST):c.596C>T(p.Thr199Met) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000449 in 1,564,482 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. T199T) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00049 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00044 ( 0 hom. )

Consequence

DDOST
NM_005216.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 7.98

Variant links:

Genes affected

DDOST (HGNC:2728): (dolichyl-diphosphooligosaccharide--protein glycosyltransferase non-catalytic subunit) This gene encodes a component of the oligosaccharyltransferase complex which catalyzes the transfer of high-mannose oligosaccharides to asparagine residues on nascent polypeptides in the lumen of the rough endoplasmic reticulum. The protein complex co-purifies with ribosomes. The product of this gene is also implicated in the processing of advanced glycation endproducts (AGEs), which form from non-enzymatic reactions between sugars and proteins or lipids and are associated with aging and hyperglycemia. [provided by RefSeq, Jul 2008]

DDOST links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

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 rank	MANE	Protein	UniProt
DDOST	NM_005216.5 link	c.596C>T	p.Thr199Met	missense_variant	Exon 6 of 11	ENST00000602624.7	NP_005207.3	P39656A0A024RAD5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DDOST	ENST00000602624.7 link	c.596C>T	p.Thr199Met	missense_variant	Exon 6 of 11	1	NM_005216.5	ENSP00000473655.2		A0A0C4DGS1
DDOST	ENST00000415136.6 link	c.647C>T	p.Thr216Met	missense_variant	Exon 6 of 11	1		ENSP00000399457.3		P39656-1

Frequencies

GnomAD3 genomes

AF:

0.000493

AC:

AN:

152180

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000193

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00144

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:

0.000661

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000382

AC:

AN:

175276

Hom.:

AF XY:

0.000334

AC XY:

AN XY:

92926

show subpopulations

Gnomad AFR exome

AF:

0.000193

Gnomad AMR exome

AF:

0.000670

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000420

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000644

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000445

AC:

628

AN:

1412184

Hom.:

Cov.:

AF XY:

0.000436

AC XY:

304

AN XY:

697780

show subpopulations

Gnomad4 AFR exome

AF:

0.000124

Gnomad4 AMR exome

AF:

0.000529

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000125

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000540

Gnomad4 OTH exome

AF:

0.000273

GnomAD4 genome

AF:

0.000492

AC:

AN:

152298

Hom.:

Cov.:

AF XY:

0.000510

AC XY:

AN XY:

74466

show subpopulations

Gnomad4 AFR

AF:

0.000192

Gnomad4 AMR

AF:

0.00144

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000662

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000529

Hom.:

Bravo

AF:

0.000363

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.00105

AC:

ExAC

AF:

0.000229

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Congenital disorder of glycosylation type Ir

Uncertain:2

Jan 01, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces threonine, which is neutral and polar, with methionine, which is neutral and non-polar, at codon 216 of the DDOST protein (p.Thr216Met). This variant is present in population databases (rs142593688, gnomAD 0.07%), and has an allele count higher than expected for a pathogenic variant. This variant has not been reported in the literature in individuals affected with DDOST-related conditions. ClinVar contains an entry for this variant (Variation ID: 577586). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt DDOST protein function with a negative predictive value of 80%. 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. -

Jan 06, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided

Uncertain:1

Breakthrough Genomics, Breakthrough Genomics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: not provided

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.15

BayesDel_addAF

Benign

-0.062

BayesDel_noAF

Uncertain

0.060

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.71

D;T;D

Eigen

Uncertain

0.59

Eigen_PC

Uncertain

0.55

FATHMM_MKL

Pathogenic

0.97

LIST_S2

Pathogenic

0.98

D;D;.

M_CAP

Uncertain

0.12

MetaRNN

Uncertain

0.45

T;T;T

MetaSVM

Uncertain

0.091

MutationAssessor

Uncertain

2.4

M;.;M

PrimateAI

Pathogenic

0.87

PROVEAN

Uncertain

-3.4

.;.;D

REVEL

Uncertain

0.56

Sift

Benign

0.12

.;.;T

Sift4G

Benign

0.14

T;T;T

Polyphen

0.81

P;.;P

Vest4

0.80

MVP

0.92

MPC

0.37

ClinPred

0.12

GERP RS

5.5

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.6

Varity_R

0.31

gMVP

0.75

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over