NM_007254.4:c.1009G>C

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_007254.4(PNKP):c.1009G>C(p.Glu337Gln) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000167 in 1,554,584 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Synonymous variant affecting the same amino acid position (i.e. E337E) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000059 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000012 ( 0 hom. )

Consequence

PNKP
NM_007254.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:3B:1

Conservation

PhyloP100: 0.268

Variant links:

Genes affected

PNKP (HGNC:9154): (polynucleotide kinase 3'-phosphatase) This locus represents a gene involved in DNA repair. In response to ionizing radiation or oxidative damage, the protein encoded by this locus catalyzes 5' phosphorylation and 3' dephosphorylation of nucleic acids. Mutations at this locus have been associated with microcephaly, seizures, and developmental delay.[provided by RefSeq, Sep 2010]

PNKP links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.024107128).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
PNKP	NM_007254.4 link	c.1009G>C	p.Glu337Gln	missense_variant	Exon 11 of 17	ENST00000322344.8	NP_009185.2	Q96T60-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
PNKP	ENST00000322344.8 link	c.1009G>C	p.Glu337Gln	missense_variant	Exon 11 of 17	1	NM_007254.4	ENSP00000323511.2		Q96T60-1

Frequencies

GnomAD3 genomes

AF:

0.0000593

AC:

AN:

151874

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00877

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000249

AC:

AN:

160814

Hom.:

AF XY:

0.0000233

AC XY:

AN XY:

85802

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000394

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000835

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000318

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000121

AC:

AN:

1402710

Hom.:

Cov.:

AF XY:

0.0000116

AC XY:

AN XY:

692370

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000276

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000829

Gnomad4 SAS exome

AF:

0.0000126

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000370

Gnomad4 OTH exome

AF:

0.000138

GnomAD4 genome

AF:

0.0000593

AC:

AN:

151874

Hom.:

Cov.:

AF XY:

0.0000809

AC XY:

AN XY:

74180

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:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000434

Hom.:

Bravo

AF:

0.0000907

ExAC

AF:

0.0000176

AC:

Asia WGS

AF:

0.00173

AC:

AN:

3474

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:3Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Jan 08, 2020

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.E337Q variant (also known as c.1009G>C), located in coding exon 10 of the PNKP gene, results from a G to C substitution at nucleotide position 1009. The glutamic acid at codon 337 is replaced by glutamine, an amino acid with highly similar properties. This alteration has been reported in a subject with juvenile myoclonic epilepsy (Lee CG et al. PLoS ONE, 2018 Jun;13:e0199321). This amino acid position is not well conserved in available vertebrate species, and glutamine is the reference amino acid in other vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Charcot-Marie-Tooth disease type 2B2;C3150667:Microcephaly, seizures, and developmental delay;C4225397:Ataxia - oculomotor apraxia type 4

Uncertain:1

May 01, 2024

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Developmental and epileptic encephalopathy, 12

Uncertain:1

Aug 20, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces glutamic acid, which is acidic and polar, with glutamine, which is neutral and polar, at codon 337 of the PNKP protein (p.Glu337Gln). This variant is present in population databases (rs780121125, gnomAD 0.008%). This missense change has been observed in individual(s) with juvenile myoclonic epilepsy (PMID: 29924869). ClinVar contains an entry for this variant (Variation ID: 391407). Algorithms developed to predict the effect of missense changes on protein structure and function output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The glutamine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. 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

Benign:1

Apr 03, 2019

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.070

BayesDel_addAF

Benign

-0.30

BayesDel_noAF

Benign

-0.47

CADD

Benign

DANN

Benign

0.74

DEOGEN2

Benign

0.024

T;T;T;T

Eigen

Benign

-0.78

Eigen_PC

Benign

-0.87

FATHMM_MKL

Benign

0.17

LIST_S2

Benign

0.72

T;.;T;T

M_CAP

Uncertain

0.12

MetaRNN

Benign

0.024

T;T;T;T

MetaSVM

Benign

-0.95

MutationAssessor

Benign

1.3

.;L;.;L

PrimateAI

Uncertain

0.63

PROVEAN

Benign

-0.61

.;N;.;.

REVEL

Benign

0.080

Sift

Benign

0.36

.;T;.;.

Sift4G

Benign

0.38

T;T;T;T

Polyphen

0.55

.;P;.;P

Vest4

0.20

MVP

0.59

MPC

0.088

ClinPred

0.053

GERP RS

-1.1

Varity_R

0.029

gMVP

0.49

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