9-128945746-T-C

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 5P and 1B. PM2PP3_ModeratePP5BS1_Supporting

The NM_014908.4(DOLK):c.1558A>G(p.Thr520Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000121 in 1,614,030 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00013 ( 0 hom. )

Consequence

DOLK
NM_014908.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:2U:2

Conservation

PhyloP100: 8.02

Variant links:

Genes affected

DOLK (HGNC:23406): (dolichol kinase) The protein encoded by this gene catalyzes the CTP-mediated phosphorylation of dolichol, and is involved in the synthesis of Dol-P-Man, which is an essential glycosyl carrier lipid for C- and O-mannosylation, N- and O-linked glycosylation of proteins, and for the biosynthesis of glycosyl phosphatidylinositol anchors in endoplasmic reticulum. Mutations in this gene are associated with dolichol kinase deficiency.[provided by RefSeq, Apr 2010]

DOLK links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.908

PP5

Variant 9-128945746-T-C is Pathogenic according to our data. Variant chr9-128945746-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 653127.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=1, Uncertain_significance=2, Pathogenic=1}.

BS1

Variant frequency is greater than expected in population nfe. gnomad4_exome allele frequency = 0.000129 (188/1461890) while in subpopulation NFE AF= 0.000153 (170/1112012). AF 95% confidence interval is 0.000133. There are 0 homozygotes in gnomad4_exome. There are 83 alleles in male gnomad4_exome subpopulation. Median coverage is 31. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
DOLK	NM_014908.4 linkuse as main transcript	c.1558A>G	p.Thr520Ala	missense_variant	1/1	ENST00000372586.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
DOLK	ENST00000372586.4 linkuse as main transcript	c.1558A>G	p.Thr520Ala	missense_variant	1/1		NM_014908.4	P1

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152140

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

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:

0.0000882

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000358

AC:

AN:

251490

Hom.:

AF XY:

0.0000441

AC XY:

AN XY:

135920

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000289

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000615

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000129

AC:

188

AN:

1461890

Hom.:

Cov.:

AF XY:

0.000114

AC XY:

AN XY:

727246

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.0000224

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000153

Gnomad4 OTH exome

AF:

0.000248

GnomAD4 genome

AF:

0.0000526

AC:

AN:

152140

Hom.:

Cov.:

AF XY:

0.0000538

AC XY:

AN XY:

74332

show subpopulations

Gnomad4 AFR

AF:

0.0000483

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:

0.0000882

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000579

Hom.:

Bravo

AF:

0.0000718

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.000109

EpiControl

AF:

0.0000593

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:2Uncertain:2

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

DK1-congenital disorder of glycosylation

Pathogenic:1Uncertain:1

Uncertain significance, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Sep 23, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Oct 03, 2023	This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 520 of the DOLK protein (p.Thr520Ala). This variant is present in population databases (rs374860681, gnomAD 0.005%). This missense change has been observed in individual(s) with DOLK-congenital disorder of glycosylation (PMID: 28816422, 34956305). It has also been observed to segregate with disease in related individuals. ClinVar contains an entry for this variant (Variation ID: 653127). 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 expected to disrupt DOLK protein function. For these reasons, this variant has been classified as Pathogenic. -

DOLK-related disorder

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

PreventionGenetics, part of Exact Sciences

Oct 05, 2023

The DOLK c.1558A>G variant is predicted to result in the amino acid substitution p.Thr520Ala. This variant has been reported in the compound heterozygous state in two families with DOLK-related disease (Rush et al. 2017. PubMed ID: 28816422; Komlosi et al. 2021. PubMed ID: 34956305). This variant is reported in 0.0062% of alleles in individuals of European (Non-Finnish) descent in gnomAD (http://gnomad.broadinstitute.org/variant/9-131708025-T-C). This variant is interpreted as likely pathogenic. -

Cardiovascular phenotype

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 21, 2023

The p.T520A variant (also known as c.1558A>G), located in coding exon 1 of the DOLK gene, results from an A to G substitution at nucleotide position 1558. The threonine at codon 520 is replaced by alanine, an amino acid with similar properties. This variant has been detected in trans with a DOLK nonsense alteration in two siblings with severe neonatal presentations with findings that included severe icthyosis, distal digital truncations, and dilated cardiomyopathy with and without non-compaction cardiomyopathy (Rush ET et al. Am. J. Med. Genet. A, 2017 Sep;173:2428-2434). This variant has been detected in trans with a DOLK missense variant in two related cases with lethal ichthyosis, distal digital constrictions, cardiomegaly and additional findings (Komlosi K et al. Front Genet. 2021 Dec;12:719624). This variant was also detected in an exome sequencing referral cohort; however, details were not provided (Retterer K et al. Genet. Med., 2016 07;18:696-704). This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be deleterious by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.86

BayesDel_addAF

Uncertain

0.16

BayesDel_noAF

Pathogenic

0.14

Cadd

Pathogenic

Dann

Uncertain

1.0

DEOGEN2

Uncertain

0.57

Eigen

Pathogenic

0.83

Eigen_PC

Pathogenic

0.79

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.88

M_CAP

Benign

0.055

MetaRNN

Pathogenic

0.91

MetaSVM

Benign

-0.28

MutationAssessor

Benign

1.1

MutationTaster

Benign

1.0

PrimateAI

Uncertain

0.59

PROVEAN

Uncertain

-3.9

REVEL

Pathogenic

0.72

Sift

Uncertain

0.0030

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.93

MVP

0.79

MPC

1.1

ClinPred

0.59

GERP RS

5.7

Varity_R

0.46

gMVP

0.91

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