NM_007254.4:c.1522G>A

Variant names:

Variant summary

Our verdict is Benign. The variant received -9 ACMG points: 0P and 9B. BP4_StrongBP6BS1

The NM_007254.4(PNKP):c.1522G>A(p.Glu508Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000498 in 1,613,940 control chromosomes in the GnomAD database, including 2 homozygotes. 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). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. E508D) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0027 ( 1 hom., cov: 32)

Exomes 𝑓: 0.00027 ( 1 hom. )

Consequence

PNKP
NM_007254.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:5

Conservation

PhyloP100: 0.0170

Publications

5 publications found

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 Gene-Disease associations (from GenCC):

ataxia - oculomotor apraxia type 4
Inheritance: AR Classification: DEFINITIVE, SUPPORTIVE Submitted by: Orphanet, G2P, Laboratory for Molecular Medicine
microcephaly, seizures, and developmental delay
Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: ClinGen, Ambry Genetics, Labcorp Genetics (formerly Invitae)
Charcot-Marie-Tooth disease type 2B2
Inheritance: AR Classification: STRONG, SUPPORTIVE Submitted by: Orphanet, Labcorp Genetics (formerly Invitae)
genetic developmental and epileptic encephalopathy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

PNKP links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.006211579).

BP6

Variant 19-49861292-C-T is Benign according to our data. Variant chr19-49861292-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 138725.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.00267 (407/152270) while in subpopulation AFR AF = 0.00936 (389/41550). AF 95% confidence interval is 0.0086. There are 1 homozygotes in GnomAd4. There are 187 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_007254.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PNKP	NM_007254.4	MANE Select	c.1522G>A	p.Glu508Lys	missense	Exon 17 of 17	NP_009185.2

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
PNKP	ENST00000322344.8	TSL:1 MANE Select	c.1522G>A	p.Glu508Lys	missense	Exon 17 of 17	ENSP00000323511.2
PNKP	ENST00000596014.5	TSL:1	c.1522G>A	p.Glu508Lys	missense	Exon 16 of 16	ENSP00000472300.1
PNKP	ENST00000593946.5	TSL:1	n.*1449G>A		non_coding_transcript_exon	Exon 16 of 16	ENSP00000468896.1

Frequencies

GnomAD3 genomes

AF:

0.00267

AC:

406

AN:

152152

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00937

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000785

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000414

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00192

GnomAD2 exomes

AF:

0.000709

AC:

178

AN:

251162

AF XY:

0.000523

show subpopulations

Gnomad AFR exome

AF:

0.00994

Gnomad AMR exome

AF:

0.000260

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.000816

GnomAD4 exome

AF:

0.000272

AC:

397

AN:

1461670

Hom.:

Cov.:

AF XY:

0.000245

AC XY:

178

AN XY:

727142

show subpopulations

African (AFR)

AF:

0.00941

AC:

315

AN:

33476

American (AMR)

AF:

0.000313

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26134

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.0000348

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53358

Middle Eastern (MID)

AF:

0.000867

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.0000117

AC:

AN:

1111872

Other (OTH)

AF:

0.000778

AC:

AN:

60386

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.471

Heterozygous variant carriers

120

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome 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

GnomAD4 genome

AF:

0.00267

AC:

407

AN:

152270

Hom.:

Cov.:

AF XY:

0.00251

AC XY:

187

AN XY:

74472

show subpopulations

African (AFR)

AF:

0.00936

AC:

389

AN:

41550

American (AMR)

AF:

0.000784

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5168

South Asian (SAS)

AF:

0.000415

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

68014

Other (OTH)

AF:

0.00190

AC:

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.502

Heterozygous variant carriers

115

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

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:

0.000614

Hom.:

Bravo

AF:

0.00293

ESP6500AA

AF:

0.0125

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.000906

AC:

110

Asia WGS

AF:

0.00115

AC:

AN:

3478

EpiCase

AF:

0.000109

EpiControl

AF:

0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:5

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Benign:2

Nov 28, 2018

Athena Diagnostics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Jun 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

PNKP: BP4, BS1, BS2

Microcephaly, seizures, and developmental delay

Uncertain:1

Apr 03, 2014

Genetic Services Laboratory, University of Chicago

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

not specified

Benign:1

Oct 02, 2013

GeneDx

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease.

Inborn genetic diseases

Benign:1

Jul 23, 2018

Ambry Genetics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This alteration is classified as benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity.

Developmental and epileptic encephalopathy, 12

Benign:1

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.64

BayesDel_noAF

Benign

-0.68

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.095

Eigen

Benign

-0.55

Eigen_PC

Benign

-0.48

FATHMM_MKL

Benign

0.22

LIST_S2

Benign

0.85

MetaRNN

Benign

0.0062

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.2

PhyloP100

0.017

PrimateAI

Benign

0.46

PROVEAN

Benign

-0.61

REVEL

Benign

0.090

Sift

Benign

0.060

Sift4G

Uncertain

0.019

Polyphen

0.22

Vest4

0.14

MVP

0.42

MPC

0.10

ClinPred

0.0087

GERP RS

2.3

PromoterAI

-0.51

Under-expression

(source)

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Varity_R

0.096

gMVP

0.55

Mutation Taster

=100/0

polymorphism

(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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over