NM_014908.4:c.898C>T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM2PP3_ModerateBS1_Supporting

The NM_014908.4(DOLK):c.898C>T(p.Leu300Phe) variant causes a missense change. The variant allele was found at a frequency of 0.000149 in 1,613,960 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 Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.00013 ( 0 hom., cov: 31)

Exomes 𝑓: 0.00015 ( 0 hom. )

Consequence

DOLK
NM_014908.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:5

Conservation

PhyloP100: 5.21

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:

ENSG00000251184 (HGNC:):

ENSG00000251184 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.872

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000131 (20/152160) while in subpopulation NFE AF= 0.000176 (12/68026). AF 95% confidence interval is 0.000102. There are 0 homozygotes in gnomad4. There are 10 alleles in male gnomad4 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 rank	MANE	Protein	UniProt
DOLK	NM_014908.4 link	c.898C>T	p.Leu300Phe	missense_variant	Exon 1 of 1	ENST00000372586.4	NP_055723.1	Q9UPQ8A0A0S2Z597

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DOLK	ENST00000372586.4 link	c.898C>T	p.Leu300Phe	missense_variant	Exon 1 of 1	6	NM_014908.4	ENSP00000361667.3		Q9UPQ8
ENSG00000251184	ENST00000482796.1 link	c.39-2783G>A		intron_variant	Intron 1 of 4	2		ENSP00000417556.2		H7C4K7

Frequencies

GnomAD3 genomes

AF:

0.000131

AC:

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000121

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.000576

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000176

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000119

AC:

AN:

251200

Hom.:

AF XY:

0.000103

AC XY:

AN XY:

135800

show subpopulations

Gnomad AFR exome

AF:

0.000123

Gnomad AMR exome

AF:

0.000202

Gnomad ASJ exome

AF:

0.0000994

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000167

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000151

AC:

221

AN:

1461800

Hom.:

Cov.:

AF XY:

0.000139

AC XY:

101

AN XY:

727204

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000201

Gnomad4 ASJ exome

AF:

0.000230

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000116

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000178

Gnomad4 OTH exome

AF:

0.0000993

GnomAD4 genome

AF:

0.000131

AC:

AN:

152160

Hom.:

Cov.:

AF XY:

0.000135

AC XY:

AN XY:

74340

show subpopulations

Gnomad4 AFR

AF:

0.000121

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.000576

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000176

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000164

Hom.:

Bravo

AF:

0.000181

TwinsUK

AF:

0.000270

AC:

ALSPAC

AF:

0.000519

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.000132

AC:

EpiCase

AF:

0.000436

EpiControl

AF:

0.000296

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

DK1-congenital disorder of glycosylation

Uncertain:2

Feb 22, 2022

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 06, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces leucine, which is neutral and non-polar, with phenylalanine, which is neutral and non-polar, at codon 300 of the DOLK protein (p.Leu300Phe). This variant is present in population databases (rs371529625, gnomAD 0.02%). This variant has not been reported in the literature in individuals affected with DOLK-related conditions. ClinVar contains an entry for this variant (Variation ID: 392015). 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 expected to disrupt DOLK protein function with a positive 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. -

not provided

Uncertain:2

Department of Pathology and Laboratory Medicine, Sinai Health System

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: clinical testing

The DOLK p.Leu300Phe variant was identified in dbSNP (ID: rs371529625) and ClinVar (classified as a VUS by GeneDx and Invitae) but was not identified in Cosmic or LOVD 3.0. The variant was also identified in control databases in 33 of 282592 chromosomes at a frequency of 0.000117 (Genome Aggregation Database Feb 27, 2017). The variant was observed in the following populations: Latino in 7 of 35436 chromosomes (freq: 0.000198), African in 4 of 24914 chromosomes (freq: 0.000161), European (non-Finnish) in 20 of 129000 chromosomes (freq: 0.000155), Other in 1 of 7214 chromosomes (freq: 0.000139) and Ashkenazi Jewish in 1 of 10348 chromosomes (freq: 0.000097); it was not observed in the East Asian, European (Finnish), and South Asian populations. The p.Leu300 residue is conserved in mammals and computational analyses (PolyPhen-2, SIFT, AlignGVGD, BLOSUM, MutationTaster) provide inconsistent predictions regarding the impact to the protein; this information is not very predictive of pathogenicity. The variant occurs outside of the splicing consensus sequence and in silico or computational prediction software programs (SpliceSiteFinder, MaxEntScan, NNSPLICE, GeneSplicer) do not predict a difference in splicing. In summary, based on the above information the clinical significance of this variant cannot be determined with certainty at this time. This variant is classified as a variant of uncertain significance. -

May 14, 2024

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Cardiovascular phenotype

Uncertain:1

Jan 29, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.L300F variant (also known as c.898C>T), located in coding exon 1 of the DOLK gene, results from a C to T substitution at nucleotide position 898. The leucine at codon 300 is replaced by phenylalanine, an amino acid with highly similar properties. 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

0.63

BayesDel_addAF

Pathogenic

0.24

BayesDel_noAF

Pathogenic

0.37

CADD

Pathogenic

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.69

Eigen

Pathogenic

0.75

Eigen_PC

Pathogenic

0.71

FATHMM_MKL

Uncertain

0.91

LIST_S2

Uncertain

0.90

M_CAP

Uncertain

0.10

MetaRNN

Pathogenic

0.87

MetaSVM

Uncertain

0.66

MutationAssessor

Pathogenic

3.7

PrimateAI

Uncertain

0.57

PROVEAN

Uncertain

-3.4

REVEL

Pathogenic

0.77

Sift

Uncertain

0.0030

Sift4G

Pathogenic

0.0

Polyphen

1.0

Vest4

0.86

MVP

0.91

MPC

1.2

ClinPred

0.86

GERP RS

5.3

Varity_R

0.51

gMVP

0.66

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