NM_018129.4:c.226G>C

Variant names:

• chr17-47943393-G-C
• rs370329917
• NM_018129.4:c.226G>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_018129.4(PNPO):​c.226G>C​(p.Gly76Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000137 in 1,461,652 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another nucleotide change resulting in the same amino acid substitution has been previously reported as Uncertain significance in ClinVar. Synonymous variant affecting the same amino acid position (i.e. G76G) has been classified as Likely benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: PNPO NM_018129.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 4.43
• Publications: 1 publications found

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

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20206404).

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.226G>C	p.Gly76Arg	missense	Exon 2 of 7	NP_060599.1
	PNPO	NM_001436305.1		c.226G>C	p.Gly76Arg	missense	Exon 2 of 6	NP_001423234.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	PNPO	ENST00000642017.2	MANE Select	c.226G>C	p.Gly76Arg	missense	Exon 2 of 7	ENSP00000493302.2
	PNPO	ENST00000225573.5	TSL:1	c.226G>C	p.Gly76Arg	missense	Exon 2 of 6	ENSP00000225573.5
	PNPO	ENST00000434554.7	TSL:2	c.226G>C	p.Gly76Arg	missense	Exon 2 of 6	ENSP00000399960.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD2 exomes AF: 0.00000398 AC: 1 AN: 251462 AF XY: 0.00000736

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: 0.00000879

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461652 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 727128

African (AFR) AF: 0.00 AC: 0 AN: 33476

American (AMR) AF: 0.00 AC: 0 AN: 44714

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

East Asian (EAS) AF: 0.00 AC: 0 AN: 39686

South Asian (SAS) AF: 0.00 AC: 0 AN: 86240

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53406

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5762

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111854

Other (OTH) AF: 0.00 AC: 0 AN: 60378

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.25
BayesDel_addAF	Uncertain	0.030	T
BayesDel_noAF	Benign	-0.19
CADD	Benign	21
DANN	Benign	0.83
DEOGEN2	Benign	0.050	T
Eigen	Benign	-0.27
Eigen_PC	Benign	-0.18
FATHMM_MKL	Uncertain	0.94	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.044	D
MetaRNN	Benign	0.20	T
MetaSVM	Benign	-0.94	T
MutationAssessor	Benign	0.52	N
PhyloP100		4.4
PrimateAI	Uncertain	0.53	T
PROVEAN	Benign	-0.46	N
REVEL	Uncertain	0.29
Sift	Benign	0.42	T
Sift4G	Benign	0.53	T
Polyphen		0.90	P
Vest4		0.48
MutPred		0.44		Gain of solvent accessibility (P = 0.0037)
MVP		0.78
MPC		1.3
ClinPred		0.37	T
GERP RS		1.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.16
gMVP		0.69
Mutation Taster		=64/36	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: rs370329917; hg19: chr17-46020759;