Genetic Variant PNPO:p.Tyr256Ser (chr17-47946763-A-C) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2PP3

The NM_018129.4(PNPO):c.767A>C(p.Tyr256Ser) variant causes a missense change. The variant allele was found at a frequency of 0.0000041 in 1,461,846 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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. Y256C) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000041 ( 0 hom. )

Consequence

PNPO
NM_018129.4 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 4.08

Publications

5 publications found

Variant links:

Genes affected

PNPO (HGNC:30260): (pyridoxamine 5'-phosphate oxidase) The enzyme encoded by this gene catalyzes the terminal, rate-limiting step in the synthesis of pyridoxal 5'-phosphate, also known as vitamin B6. Vitamin B6 is a required co-factor for enzymes involved in both homocysteine metabolism and synthesis of neurotransmitters such as catecholamine. Mutations in this gene result in pyridoxamine 5'-phosphate oxidase (PNPO) deficiency, a form of neonatal epileptic encephalopathy. [provided by RefSeq, Oct 2008]

PNPO Gene-Disease associations (from GenCC):

pyridoxal phosphate-responsive seizures
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: G2P, ClinGen, Labcorp Genetics (formerly Invitae), Orphanet

PNPO links:

ENSG00000263798 (HGNC:):

ENSG00000263798 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.783

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_018129.4. 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
	PNPO	NM_018129.4	MANE Select	c.767A>C	p.Tyr256Ser	missense	Exon 7 of 7	NP_060599.1
	PNPO	NM_001436305.1		c.638A>C	p.Tyr213Ser	missense	Exon 6 of 6	NP_001423234.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
PNPO	ENST00000642017.2	MANE Select	c.767A>C	p.Tyr256Ser	missense	Exon 7 of 7	ENSP00000493302.2
PNPO	ENST00000225573.5	TSL:1	c.638A>C	p.Tyr213Ser	missense	Exon 6 of 6	ENSP00000225573.5
PNPO	ENST00000434554.7	TSL:2	c.713A>C	p.Tyr238Ser	missense	Exon 6 of 6	ENSP00000399960.3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000398

AC:

AN:

251108

AF XY:

0.00

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 FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000881

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000410

AC:

AN:

1461846

Hom.:

Cov.:

AF XY:

0.00000550

AC XY:

AN XY:

727224

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39698

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53394

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.00000540

AC:

AN:

1112002

Other (OTH)

AF:

0.00

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

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

Cov.:

Alfa

AF:

0.0000225

Hom.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.78

BayesDel_addAF

Pathogenic

0.36

BayesDel_noAF

Pathogenic

0.27

CADD

Uncertain

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.58

Eigen

Uncertain

0.39

Eigen_PC

Uncertain

0.38

FATHMM_MKL

Uncertain

0.96

LIST_S2

Uncertain

0.97

M_CAP

Uncertain

0.19

MetaRNN

Pathogenic

0.78

MetaSVM

Uncertain

-0.13

MutationAssessor

Benign

1.4

PhyloP100

4.1

PrimateAI

Benign

0.45

REVEL

Pathogenic

0.67

Polyphen

1.0

MutPred

0.56

Gain of disorder (P = 0.0124)

MVP

0.90

MPC

1.6

ClinPred

0.99

GERP RS

4.1

Varity_R

0.94

gMVP

0.74

Mutation Taster

=7/93

disease causing

(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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over