rs104894631
Positions:
Variant summary
Our verdict is Likely pathogenic. Variant got 6 ACMG points: 6P and 0B. PM2PM4PP5_Moderate
The NM_018129.4(PNPO):c.784T>C(p.Ter262Glnext*?) variant causes a stop lost change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,682 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★).
Frequency
Genomes: not found (cov: 32)
Exomes 𝑓: 6.8e-7 ( 0 hom. )
Consequence
PNPO
NM_018129.4 stop_lost
NM_018129.4 stop_lost
Scores
3
1
3
Clinical Significance
Conservation
PhyloP100: 7.40
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]
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ACMG classification
Classification made for transcript
Verdict is Likely_pathogenic. Variant got 6 ACMG points.
PM2
Very rare variant in population databases, with high coverage;
PM4
Stoplost variant in NM_018129.4 Downstream stopcodon found after 296 codons.
PP5
Variant 17-47946780-T-C is Pathogenic according to our data. Variant chr17-47946780-T-C is described in ClinVar as [Pathogenic]. Clinvar id is 6525.Status of the report is criteria_provided_single_submitter, 1 stars.
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
PNPO | NM_018129.4 | c.784T>C | p.Ter262Glnext*? | stop_lost | 7/7 | ENST00000642017.2 | NP_060599.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
PNPO | ENST00000642017.2 | c.784T>C | p.Ter262Glnext*? | stop_lost | 7/7 | NM_018129.4 | ENSP00000493302.2 |
Frequencies
GnomAD3 genomes Cov.: 32
GnomAD3 genomes
Cov.:
32
GnomAD4 exome AF: 6.84e-7 AC: 1AN: 1461682Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0AN XY: 727146
GnomAD4 exome
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1
AN:
1461682
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31
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0
AN XY:
727146
Gnomad4 AFR exome
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GnomAD4 genome Cov.: 32
GnomAD4 genome
Cov.:
32
ClinVar
Significance: Pathogenic
Submissions summary: Pathogenic:2
Revision: criteria provided, single submitter
LINK: link
Submissions by phenotype
Pyridoxal phosphate-responsive seizures Pathogenic:2
Pathogenic, no assertion criteria provided | literature only | OMIM | Apr 15, 2005 | - - |
Pathogenic, criteria provided, single submitter | clinical testing | Neuberg Centre For Genomic Medicine, NCGM | - | The stop lost p.*262Qext*28 in PNPO (NM_018129.4) has been previously reported in homozygous form in individuals affected with Pyridoxamine 5'-phosphate oxidase deficiency. Expression studies in Chinese hamster ovary cells showed that the stop codon (X262Q) mutation was null activity mutation (Mills et al, 2005). The p.*262Qext*28 variant is novel (not in any individuals) in gnomAD Exomes and is novel (not in any individuals) in 1000 Genomes. The p.Ter262GlnextTer28 variant in the stop codon (Ter/*) at position 262, changing it to a Glutamine-codon (a no-stop variant) and adding a tail of new amino acids to the protein’s C-terminus, ending at a new stop codon (Ter/*) at position 28. The nucleotide c.784 in PNPO is predicted conserved by GERP++ and PhyloP across 100 vertebrates. For these reasons, this variant has been classified as Pathogenic. The observed variant was also detected in the spouse. - |
Computational scores
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Name
Calibrated prediction
Score
Prediction
BayesDel_addAF
Uncertain
D
BayesDel_noAF
Benign
CADD
Benign
DANN
Benign
Eigen
Pathogenic
Eigen_PC
Pathogenic
FATHMM_MKL
Pathogenic
D
GERP RS
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at