NM_000274.4:c.749G>C

Variant names:

• chr10-124403820-C-G
• rs121965052
• NM_000274.4:c.749G>C

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP3_Strong PP5

The NM_000274.4(OAT):​c.749G>C​(p.Arg250Pro) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (no stars). Synonymous variant affecting the same amino acid position (i.e. R250R) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: OAT NM_000274.4 missense
• Clinical Significance: Pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 5.82

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 9 ACMG points.

• PM1: In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 3 uncertain in NM_000274.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.991
• PP5: Variant 10-124403820-C-G is Pathogenic according to our data. Variant chr10-124403820-C-G is described in ClinVar as [Pathogenic]. Clinvar id is 169.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr10-124403820-C-G is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OAT	NM_000274.4	c.749G>C	p.Arg250Pro	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.749G>C	p.Arg250Pro	missense_variant	Exon 6 of 10	1	NM_000274.4	ENSP00000357838.5
OAT	ENST00000539214.5	c.335G>C	p.Arg112Pro	missense_variant	Exon 5 of 9	1		ENSP00000439042.1
OAT	ENST00000467675.5	n.550G>C		non_coding_transcript_exon_variant	Exon 5 of 7	5
OAT	ENST00000483711.1	n.*25G>C		downstream_gene_variant		5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Ornithine aminotransferase deficiency Pathogenic:1

Jun 01, 1992

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.97
BayesDel_addAF	Pathogenic	0.44	D
BayesDel_noAF	Pathogenic	0.40
CADD	Pathogenic	28
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.97	.;D
Eigen	Uncertain	0.53
Eigen_PC	Uncertain	0.50
FATHMM_MKL	Uncertain	0.93	D
LIST_S2	Uncertain	0.92	D;D
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	0.88	D
MutationAssessor	Pathogenic	4.1	.;H
PrimateAI	Uncertain	0.61	T
PROVEAN	Pathogenic	-5.8	D;D
REVEL	Pathogenic	0.80
Sift	Uncertain	0.0040	D;D
Sift4G	Uncertain	0.0030	D;D
Polyphen		0.44	.;B
Vest4		0.91
MutPred		0.94		.;Gain of phosphorylation at Y245 (P = 0.1193);
MVP		0.97
MPC		0.58
ClinPred		1.0	D
GERP RS		4.8
Varity_R		0.99
gMVP		0.99

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs121965052; hg19: chr10-126092389;