NM_000274.4:c.748C>G

Variant names:

• chr10-124403821-G-C
• rs386833617
• NM_000274.4:c.748C>G

Variant summary

Our verdict is Likely pathogenic. Variant got 8 ACMG points: 8P and 0B. PM2 PM5 PP3_Strong

The NM_000274.4(OAT):​c.748C>G​(p.Arg250Gly) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. R250P) has been classified as Pathogenic.

• Frequency: Genomes: not found (cov: 32)
• Consequence: OAT NM_000274.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.04

Genes affected

OAT (HGNC:8091): (ornithine aminotransferase) This gene encodes the mitochondrial enzyme ornithine aminotransferase, which is a key enzyme in the pathway that converts arginine and ornithine into the major excitatory and inhibitory neurotransmitters glutamate and GABA. Mutations that result in a deficiency of this enzyme cause the autosomal recessive eye disease Gyrate Atrophy. Alternatively spliced transcript variants encoding different isoforms have been described. Related pseudogenes have been defined on the X chromosome. [provided by RefSeq, Jan 2010]

ACMG classification

Verdict is Likely_pathogenic. Variant got 8 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chr10-124403820-C-G is described in Lovd as [Pathogenic].
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.988

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OAT	NM_000274.4	c.748C>G	p.Arg250Gly	missense_variant	Exon 6 of 10	ENST00000368845.6	NP_000265.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
OAT	ENST00000368845.6	c.748C>G	p.Arg250Gly	missense_variant	Exon 6 of 10	1	NM_000274.4	ENSP00000357838.5
OAT	ENST00000539214.5	c.334C>G	p.Arg112Gly	missense_variant	Exon 5 of 9	1		ENSP00000439042.1
OAT	ENST00000467675.5	n.549C>G		non_coding_transcript_exon_variant	Exon 5 of 7	5
OAT	ENST00000483711.1	n.*24C>G		downstream_gene_variant		5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.52
BayesDel_addAF	Pathogenic	0.42	D
BayesDel_noAF	Pathogenic	0.36
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.97	.;D
Eigen	Uncertain	0.49
Eigen_PC	Uncertain	0.36
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Pathogenic	0.98	D;D
M_CAP	Uncertain	0.26	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	0.86	D
MutationAssessor	Pathogenic	3.6	.;H
PrimateAI	Uncertain	0.57	T
PROVEAN	Pathogenic	-5.8	D;D
REVEL	Pathogenic	0.81
Sift	Uncertain	0.0060	D;D
Sift4G	Uncertain	0.0040	D;D
Polyphen		0.96	.;D
Vest4		0.88
MutPred		0.90		.;Gain of catalytic residue at G248 (P = 0.1717);
MVP		0.96
MPC		0.94
ClinPred		1.0	D
GERP RS		2.8
Varity_R		0.91
gMVP		0.96

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.15		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: rs386833617; hg19: chr10-126092390;