rs587784367

Positions:

• chr19-49865323-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_007254.4(PNKP):​c.302C>T​(p.Pro101Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000205 in 1,461,836 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: PNKP NM_007254.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:4
• Conservation: PhyloP100: 6.01

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
PNKP	NM_007254.4	c.302C>T	p.Pro101Leu	missense_variant	4/17	ENST00000322344.8	NP_009185.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
PNKP	ENST00000322344.8	c.302C>T	p.Pro101Leu	missense_variant	4/17	1	NM_007254.4	ENSP00000323511	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1461836 Hom.: 0 Cov.: 34 AF XY: 0.00000275 AC XY: 2 AN XY: 727216

Gnomad4 AFR exome AF: 0.00

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: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

Bravo AF: 0.00000378

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:4

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Microcephaly, seizures, and developmental delay Pathogenic:1 Uncertain:1

Likely pathogenic, criteria provided, single submitter	clinical testing	Institute of Human Genetics, University of Leipzig Medical Center	Dec 08, 2020	This variant has been identified compound heterozygous with the variant NM_007254.3:c.498G>A, r.199_498del, p.Leu67_Lys166del in two fetuses with microcephaly, aplasia/hypoplasia of the cerebrum and cerebellum (hypoplastic frontal lobes, no corpus callosum) and facial dysmorphism (retrognathia, hypertelorism, long philtrum). The variant is maternally inherited. This missense variant c.302C>T, p.(Pro101Leu) in exon 4 of PNKP has been reported in ClinVar (ID 159793). The variant is absent from the general population (gnomAD). Multiple in silico-tools predict this variant as damaging. The variant is located in the FHA-domain. Taken together, we classify this variant as likely pathogenic based on the ACMG recommendations (Richards et al., 2015, PMID 25741868; criteria: PS4_MOD;PM1_SUP;PM2_SUP;PM3;PP3). -
Uncertain significance, criteria provided, single submitter	clinical testing	Genetic Services Laboratory, University of Chicago	Aug 05, 2013	- -

not provided Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Dec 01, 2018	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Feb 17, 2015	- -

Inborn genetic diseases Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Mar 18, 2020

The p.P101L variant (also known as c.302C>T), located in coding exon 3 of the PNKP gene, results from a C to T substitution at nucleotide position 302. The proline at codon 101 is replaced by leucine, an amino acid with similar properties. This amino acid position is well conserved in available vertebrate species. In addition, the in silico prediction for this alteration is inconclusive. 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	Benign	0.15
BayesDel_addAF	Uncertain	0.044	T
BayesDel_noAF	Benign	-0.17
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Benign	0.086	T;T;T;T;T;.;T
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.53
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Uncertain	0.91	D;.;D;D;D;D;D
M_CAP	Benign	0.012	T
MetaRNN	Uncertain	0.67	D;D;D;D;D;D;D
MetaSVM	Benign	-1.1	T
MutationAssessor	Uncertain	2.3	.;M;.;M;.;.;.
MutationTaster	Benign	1.0	D
PrimateAI	Uncertain	0.56	T
PROVEAN	Uncertain	-3.7	.;D;.;.;.;.;.
REVEL	Benign	0.17
Sift	Benign	0.046	.;D;.;.;.;.;.
Sift4G	Uncertain	0.0050	D;D;D;D;D;.;.
Polyphen		0.99	.;D;.;D;.;.;.
Vest4		0.70
MutPred		0.69		Gain of stability (P = 0.0341);Gain of stability (P = 0.0341);Gain of stability (P = 0.0341);Gain of stability (P = 0.0341);Gain of stability (P = 0.0341);Gain of stability (P = 0.0341);Gain of stability (P = 0.0341);
MVP		0.39
MPC		0.13
ClinPred		0.98	D
GERP RS		4.7
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.44
gMVP		0.61

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

Other links and lift over

dbSNP: rs587784367; hg19: chr19-50368580; COSMIC: COSV55586028; COSMIC: COSV55586028;