chr2-73950732-G-A

Position:

chr2-73950732-G-A

Variant summary

Our verdict is Pathogenic. Variant got 10 ACMG points: 10P and 0B. PM2PP5_Very_Strong

The NM_080916.3(DGUOK):c.591G>A(p.Gln197Gln) variant causes a splice region, synonymous change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000128 in 1,614,004 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Pathogenic (★★).

Frequency

Genomes: 𝑓 0.000046 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00014 ( 0 hom. )

Consequence

DGUOK
NM_080916.3 splice_region, synonymous

Scores

Splicing: ADA: 1.000

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:7

Conservation

PhyloP100: 9.63

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 (HGNC:):

DGUOK links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 10 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 2-73950732-G-A is Pathogenic according to our data. Variant chr2-73950732-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 214286.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-73950732-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
DGUOK	NM_080916.3 linkuse as main transcript	c.591G>A	p.Gln197Gln	splice_region_variant, synonymous_variant	4/7	ENST00000264093.9	NP_550438.1	Q16854-1E5KSL5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
DGUOK	ENST00000264093.9 linkuse as main transcript	c.591G>A	p.Gln197Gln	splice_region_variant, synonymous_variant	4/7	1	NM_080916.3	ENSP00000264093.4		Q16854-1

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152116

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

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:

0.000103

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000398

AC:

AN:

251478

Hom.:

AF XY:

0.0000294

AC XY:

AN XY:

135912

show subpopulations

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:

0.0000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000136

AC:

199

AN:

1461888

Hom.:

Cov.:

AF XY:

0.000129

AC XY:

AN XY:

727246

show subpopulations

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:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.000175

Gnomad4 OTH exome

AF:

0.0000497

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152116

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74304

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.000103

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000114

Hom.:

Bravo

AF:

0.0000453

EpiCase

AF:

0.000109

EpiControl

AF:

0.0000593

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:7

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Pathogenic:3

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	This sequence change affects codon 197 of the DGUOK mRNA. It is a 'silent' change, meaning that it does not change the encoded amino acid sequence of the DGUOK protein. RNA analysis indicates that this variant induces altered splicing and may result in an absent or disrupted protein product. This variant is present in population databases (rs748597500, gnomAD 0.01%). This variant has been observed in individual(s) with mitochondrial DNA depletion syndrome (PMID: 17073823, 17452231, 18205204). 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: 214286). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Studies have shown that this variant results in skipping of exon 4 and introduces a premature termination codon (PMID: 17073823). The resulting mRNA is expected to undergo nonsense-mediated decay. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Apr 16, 2018	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	Oct 29, 2022	Variant affects the normal splice acceptor site in intron 4 and results in abnormal gene splicing by skipping exon 4 (Mousson et al., 2007); Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 29137425, 17073823, 34299348, 30665703, 32278775, 34099697, 34026460) -

DGUOK-related disorder

Pathogenic:2

Pathogenic, no assertion criteria provided	clinical testing	PreventionGenetics, part of Exact Sciences	Jul 19, 2024	The DGUOK c.591G>A is a noncoding alteration. This variant was reported in individuals with mitochondrial DNA depletion syndrome (Mousson de Camaret et al. 2007. PubMed ID: 17073823; Sarzi et al. 2007. PubMed ID: 17452231; Dimmock et al. 2008. PubMed ID: 18205204). Additional analysis of cDNA from the patient's fibroblasts determined that the c.591G>A variant leads to skipping of exon 4 (Supplementary Figure 2A, Mousson de Camaret et al 2007. PubMed ID: 17073823). This variant is reported in 0.011% of alleles in individuals of European (Non-Finnish) descent in gnomAD. This variant is interpreted as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Sep 18, 2023	Variant summary: DGUOK c.591G>A (p.Gln197Gln) alters a conserved nucleotide located close to a canonical splice site and therefore could affect mRNA splicing, leading to a significantly altered protein sequence. Several computational tools predict a significant impact on normal splicing: Two predict the variant abolishes a canonical 5' splicing donor site, and two predict the variant weakens this site. At least one publication reports experimental evidence that this variant affects mRNA splicing, finding that it results in exon skipping (Mousson de Camaret_2007). The variant allele was found at a frequency of 4e-05 in 251478 control chromosomes (gnomAD). c.591G>A has been reported in the literature in individuals affected with DGUOK-Related Disorders (Mousson de Camaret_2007, Dimmock_2008, Sarzi_2007, Nesbitt), and some were reported as compound heterozygous with other pathogenic variants. These data indicate that the variant is likely to be associated with disease. The following publications have been ascertained in the context of this evaluation (PMID: 17073823, 18205204, 17452231, 24642831). Four submitters have cited clinical-significance assessments for this variant to ClinVar after 2014. All submitters classified the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -

Mitochondrial DNA depletion syndrome 3 (hepatocerebral type)

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Baylor Genetics

Aug 14, 2023

- -

Progressive external ophthalmoplegia with mitochondrial DNA deletions, autosomal recessive 4;C4310735:Portal hypertension, noncirrhotic;C5191055:Mitochondrial DNA depletion syndrome 3 (hepatocerebral type)

Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.30

CADD

Benign

DANN

Benign

0.90

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

1.0

SpliceAI score (max)

0.75

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.75

Position offset: 0

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