19-49865231-C-T

Variant names:

• chr19-49865231-C-T
• rs1555811583
• NM_007254.4:c.394G>A

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_007254.4(PNKP):​c.394G>A​(p.Asp132Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,872 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/22 in silico tools predict a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. D132H) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: PNKP NM_007254.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.958
• Publications: 0 publications found

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: Laboratory for Molecular Medicine, G2P, Orphanet
• microcephaly, seizures, and developmental delay

  Inheritance: AR Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, ClinGen
• 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

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.06634906).

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

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PNKP	NM_007254.4	MANE Select	c.394G>A	p.Asp132Asn	missense	Exon 4 of 17	NP_009185.2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PNKP	ENST00000322344.8	TSL:1 MANE Select	c.394G>A	p.Asp132Asn	missense	Exon 4 of 17	ENSP00000323511.2	Q96T60-1
	PNKP	ENST00000596014.5	TSL:1	c.394G>A	p.Asp132Asn	missense	Exon 3 of 16	ENSP00000472300.1	Q96T60-1
	PNKP	ENST00000593946.5	TSL:1	n.*321G>A		non_coding_transcript_exon	Exon 3 of 16	ENSP00000468896.1	M0QX49

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461872 Hom.: 0 Cov.: 34 AF XY: 0.00000138 AC XY: 1 AN XY: 727238

African (AFR) AF: 0.00 AC: 0 AN: 33480

American (AMR) AF: 0.00 AC: 0 AN: 44722

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26136

East Asian (EAS) AF: 0.00 AC: 0 AN: 39700

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53414

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111998

Other (OTH) AF: 0.00 AC: 0 AN: 60396

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.077
BayesDel_addAF	Benign	-0.31	T
BayesDel_noAF	Benign	-0.69
CADD	Benign	12
DANN	Benign	0.96
DEOGEN2	Benign	0.023	T
Eigen	Benign	-1.0
Eigen_PC	Benign	-0.97
FATHMM_MKL	Benign	0.19	N
LIST_S2	Benign	0.68	T
M_CAP	Benign	0.0047	T
MetaRNN	Benign	0.066	T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.4	L
PhyloP100		0.96
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-1.1	N
REVEL	Benign	0.073
Sift	Benign	0.28	T
Sift4G	Benign	0.086	T
Polyphen		0.0010	B
Vest4		0.051
MutPred		0.20		Gain of MoRF binding (P = 0.0364)
MVP		0.42
MPC		0.086
ClinPred		0.078	T
GERP RS		3.0
PromoterAI		0.073	Neutral
Varity_R		0.082
gMVP		0.22
Mutation Taster		=89/11	polymorphism

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

Other links and lift over

dbSNP: rs1555811583; hg19: chr19-50368488;