rs144181978

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PP3_ModeratePP5

The NM_080916.3(DGUOK):c.462T>A(p.Asn154Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000269 in 1,614,200 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 0.00020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00028 ( 0 hom. )

Consequence

DGUOK
NM_080916.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:10U:1

Conservation

PhyloP100: 0.0930

Publications

6 publications found

Variant links:

Genes affected

DGUOK (HGNC:2858): (deoxyguanosine kinase) In mammalian cells, the phosphorylation of purine deoxyribonucleosides is mediated predominantly by two deoxyribonucleoside kinases, cytosolic deoxycytidine kinase and mitochondrial deoxyguanosine kinase. The protein encoded by this gene is responsible for phosphorylation of purine deoxyribonucleosides in the mitochondrial matrix. In addition, this protein phosphorylates several purine deoxyribonucleoside analogs used in the treatment of lymphoproliferative disorders, and this phosphorylation is critical for the effectiveness of the analogs. Alternative splice variants encoding different protein isoforms have been described for this gene. [provided by RefSeq, Jul 2008]

DGUOK links:

DGUOK-AS1 (HGNC:43441): (DGUOK antisense RNA 1)

DGUOK-AS1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.899

PP5

Variant 2-73950603-T-A is Pathogenic according to our data. Variant chr2-73950603-T-A is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 214285.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
DGUOK	NM_080916.3 link	c.462T>A	p.Asn154Lys	missense_variant	Exon 4 of 7	ENST00000264093.9	NP_550438.1	Q16854-1E5KSL5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
DGUOK	ENST00000264093.9 link	c.462T>A	p.Asn154Lys	missense_variant	Exon 4 of 7	1	NM_080916.3	ENSP00000264093.4		Q16854-1

Frequencies

GnomAD3 genomes

AF:

0.000204

AC:

AN:

152190

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:

0.000426

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000135

AC:

AN:

251492

AF XY:

0.000147

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.0000992

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000281

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.000276

AC:

404

AN:

1461892

Hom.:

Cov.:

AF XY:

0.000267

AC XY:

194

AN XY:

727246

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.0000765

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000348

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.000348

AC:

387

AN:

1112010

Other (OTH)

AF:

0.000182

AC:

AN:

60396

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.471

Heterozygous variant carriers

108

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000204

AC:

AN:

152308

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74476

show subpopulations

African (AFR)

AF:

0.0000481

AC:

AN:

41562

American (AMR)

AF:

0.00

AC:

AN:

15306

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5182

South Asian (SAS)

AF:

0.00

AC:

AN:

4828

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000426

AC:

AN:

68018

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000307

Hom.:

Bravo

AF:

0.000253

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000581

AC:

ExAC

AF:

0.000115

AC:

EpiCase

AF:

0.000545

EpiControl

AF:

0.000178

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:10Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Pathogenic:5Uncertain:1

Jan 26, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces asparagine, which is neutral and polar, with lysine, which is basic and polar, at codon 154 of the DGUOK protein (p.Asn154Lys). This variant is present in population databases (rs144181978, gnomAD 0.03%). This missense change has been observed in individual(s) with DGUOK-related conditions (PMID: 23043144, 29228108, 30283818, 30956829, 31664448). In at least one individual the data is consistent with being in trans (on the opposite chromosome) from a pathogenic variant. ClinVar contains an entry for this variant (Variation ID: 214285). 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 DGUOK protein function with a positive predictive value of 95%. For these reasons, this variant has been classified as Pathogenic. -

Oct 29, 2024

GeneDx

Significance:Likely pathogenic

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; This variant is associated with the following publications: (PMID: 23043144, 30956829, 29228108, 30283818, 30393377, 32308999, 33513296, 35114397, 31664448, 29137425) -

Apr 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

DGUOK: PM3:Very Strong, PM2 -

Dec 21, 2021

Mayo Clinic Laboratories, Mayo Clinic

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PP3, PP4, PM2, PM3, PS4_moderate -

Oct 12, 2017

Eurofins Ntd Llc (ga)

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Nov 30, 2021

Revvity Omics, Revvity

Significance:Likely pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Mitochondrial DNA depletion syndrome 3 (hepatocerebral type)

Pathogenic:1

May 05, 2023

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Variant summary: DGUOK c.462T>A (p.Asn154Lys) results in a non-conservative amino acid change located in the deoxynucleoside kinase domain (IPR031314) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00014 in 251492 control chromosomes (gnomAD). c.462T>A has been reported in the literature in the compound heterozygous state in at least six individuals with multiple mitochondrial DNA deletions and primarily presenting with progressive external ophthalmoplegia and myopathy (e.g. Ronchi_2012, Komal_2018, Caporali_2018, Montano_2019, Goudenege_2019). These data indicate that the variant is very likely to be associated with Mitochondrial DNA depletion syndrome 3. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. The following publications have been ascertained in the context of this evaluation (PMID: 28902392, 30393377, 31664448, 30956829, 23043144, 30283818 , 29228108 ). Seven submitters have provided clinical-significance assessments for this variant to ClinVar after 2014 and classified the variant as either pathogenic (n=3)/likely pathogenic (n=3) or VUS (n=1). Based on the evidence outlined above, the variant was classified as pathogenic. -

Inborn genetic diseases

Pathogenic:1

Oct 18, 2022

Ambry Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The c.462T>A (p.N154K) alteration is located in exon 4 (coding exon 4) of the DGUOK gene. This alteration results from a T to A substitution at nucleotide position 462, causing the asparagine (N) at amino acid position 154 to be replaced by a lysine (K). Based on data from gnomAD, the A allele has an overall frequency of 0.014% (40/282882) total alleles studied. The highest observed frequency was 0.029% (37/129192) of European (non-Finnish) alleles. This alteration has been reported with a second DGUOK variant in multiple individuals with progressive external ophthalmoplegia and other features of adult-onset mitochondrial DNA depletion syndrome (Ronchi, 2012; Caporali, 2018; Komal, 2018; Montano, 2019). This amino acid position is not well conserved in available vertebrate species. This alteration is predicted to be tolerated by in silico analysis. Based on the available evidence, this alteration is classified as pathogenic. -

Progressive external ophthalmoplegia with mitochondrial DNA deletions, autosomal recessive 4

Pathogenic:1

Aug 18, 2016

OMIM

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

DGUOK-related disorder

Pathogenic:1

Jun 17, 2024

PreventionGenetics, part of Exact Sciences

Significance:Pathogenic

Review Status:no assertion criteria provided

Collection Method:clinical testing

The DGUOK c.462T>A variant is predicted to result in the amino acid substitution p.Asn154Lys. This variant was reported in the compound heterozygous state in three unrelated individuals presenting with late-onset progressive external ophthalmoplegia (Patients 1 and 2 in Ronchi et al. 2012. PubMed ID: 23043144; Montano et al. 2019. PubMed ID: 30956829). Analysis of muscle tissues of the patients from Ronchi et al. showed a severe defect in DGUOK activity (Ronchi et al. 2012. PubMed ID: 23043144). This variant is reported in 0.029% of alleles in individuals of European (Non-Finnish) descent in gnomAD. This variant is interpreted as pathogenic. -

Progressive external ophthalmoplegia with mitochondrial DNA deletions, autosomal recessive 4;C5191055:Mitochondrial DNA depletion syndrome 3 (hepatocerebral type);CN305369:Portal hypertension, noncirrhotic, 1

Pathogenic:1

Jun 17, 2024

Fulgent Genetics, Fulgent Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.79

BayesDel_addAF

Benign

-0.070

BayesDel_noAF

Uncertain

-0.030

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Pathogenic

0.93

Eigen

Uncertain

0.38

Eigen_PC

Uncertain

0.25

FATHMM_MKL

Uncertain

0.86

LIST_S2

Uncertain

0.89

M_CAP

Uncertain

0.22

MetaRNN

Pathogenic

0.90

MetaSVM

Uncertain

0.73

MutationAssessor

Pathogenic

3.0

PhyloP100

0.093

PrimateAI

Uncertain

0.61

PROVEAN

Uncertain

-4.2

REVEL

Pathogenic

0.76

Sift

Uncertain

0.0020

Sift4G

Benign

0.067

Polyphen

1.0

Vest4

0.78

MutPred

0.81

Gain of helix (P = 0.062);

MVP

0.99

MPC

0.58

ClinPred

0.97

GERP RS

0.50

Varity_R

0.91

gMVP

0.81

Mutation Taster

=58/42

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over