NM_000274.4:c.1311G>T

Variant names:

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_000274.4(OAT):c.1311G>T(p.Leu437Phe) variant causes a missense change. The variant allele was found at a frequency of 0.000776 in 1,613,670 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.00034 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00082 ( 2 hom. )

Consequence

OAT
NM_000274.4 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1U:1B:4

Conservation

PhyloP100: 4.64

Variant links:

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]

OAT links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.21116528).

BS2

High Homozygotes in GnomAdExome4 at 2 AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OAT	NM_000274.4 link	c.1311G>T	p.Leu437Phe	missense_variant	Exon 10 of 10	ENST00000368845.6	NP_000265.1	P04181-1A0A140VJQ4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
OAT	ENST00000368845.6 link	c.1311G>T	p.Leu437Phe	missense_variant	Exon 10 of 10	1	NM_000274.4	ENSP00000357838.5	P04181-1
OAT	ENST00000539214.5 link	c.897G>T	p.Leu299Phe	missense_variant	Exon 9 of 9	1		ENSP00000439042.1	P04181-2
OAT	ENST00000471127.1 link	n.*70G>T		downstream_gene_variant		2

Frequencies

GnomAD3 genomes

AF:

0.000342

AC:

AN:

152180

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000617

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000280

AC:

AN:

249800

Hom.:

AF XY:

0.000288

AC XY:

AN XY:

135386

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.000145

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000560

Gnomad OTH exome

AF:

0.000328

GnomAD4 exome

AF:

0.000821

AC:

1200

AN:

1461490

Hom.:

Cov.:

AF XY:

0.000802

AC XY:

583

AN XY:

727036

show subpopulations

Gnomad4 AFR exome

AF:

0.000120

Gnomad4 AMR exome

AF:

0.000179

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.0000188

Gnomad4 NFE exome

AF:

0.00102

Gnomad4 OTH exome

AF:

0.000861

GnomAD4 genome

AF:

0.000342

AC:

AN:

152180

Hom.:

Cov.:

AF XY:

0.000175

AC XY:

AN XY:

74332

show subpopulations

Gnomad4 AFR

AF:

0.000241

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000617

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000164

Hom.:

Bravo

AF:

0.000314

TwinsUK

AF:

0.00162

AC:

ALSPAC

AF:

0.000778

AC:

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000930

AC:

ExAC

AF:

0.000346

AC:

EpiCase

AF:

0.000600

EpiControl

AF:

0.000474

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1Uncertain:1Benign:4

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Ornithine aminotransferase deficiency

Pathogenic:1Benign:3

Jan 24, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 23, 2020

Natera, Inc.

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Juha Muilu Group; Institute for Molecular Medicine Finland (FIMM)

Significance: Likely pathogenic

Review Status: flagged submission

Collection Method: literature only

- -

Apr 27, 2017

Illumina Laboratory Services, Illumina

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed as part of a predisposition screen in an ostensibly healthy population. A literature search was performed for the gene, cDNA change, and amino acid change (where applicable). Publications were found based on this search. The evidence from the literature, in combination with allele frequency data from public databases where available, was sufficient to determine this variant is unlikely to cause disease. Therefore, this variant is classified as likely benign. -

not provided

Uncertain:1

Mar 01, 2017

CeGaT Center for Human Genetics Tuebingen

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Benign:1

Nov 25, 2024

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: OAT c.1311G>T (p.Leu437Phe) results in a non-conservative amino acid change in the encoded protein sequence. Three of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 0.00028 in 249800 control chromosomes in the gnomAD database, including 1 homozygotes. This frequency is not significantly higher than estimated for a pathogenic variant in OAT causing Ornithine Aminotransferase Deficiency (0.00028 vs 0.0011), allowing no conclusion about variant significance. However, the severity and onset age for OAT-related conditions are not compatible with observing homozygous controls in gnomAD. c.1311G>T has been reported in cis with a pathogenic variant on 1 allele (2nd allele carried pathogenic variant in trans) in the literature in at least 1 individual affected with Ornithine Aminotransferase Deficiency (example, Brody_1992, Doimo_2013). These report(s) do not provide unequivocal conclusions about association of the variant with Ornithine Aminotransferase Deficiency. Co-occurrences with other pathogenic variant(s) have been reported (OAT c.1250C>T, p.Pro417Leu), providing supporting evidence for a benign role. At least one publication reports experimental evidence evaluating an impact on protein function. These results showed no damaging effect of this variant in patient cells, CHO cells, or yeast expression systems (example, Brody_1992, Doimo_2013). The following publications have been ascertained in the context of this evaluation (PMID: 1737786, 23076989). ClinVar contains an entry for this variant (Variation ID: 56116). Based on the evidence outlined above, the variant was classified as likely benign. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.10

BayesDel_addAF

Uncertain

0.044

BayesDel_noAF

Pathogenic

0.27

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.72

.;D

Eigen

Uncertain

0.30

Eigen_PC

Uncertain

0.39

FATHMM_MKL

Uncertain

0.91

LIST_S2

Uncertain

0.87

D;D

M_CAP

Uncertain

0.22

MetaRNN

Benign

0.21

T;T

MetaSVM

Pathogenic

0.99

MutationAssessor

Benign

1.8

.;L

PrimateAI

Uncertain

0.58

PROVEAN

Benign

-1.3

N;N

REVEL

Pathogenic

0.65

Sift

Benign

0.049

D;D

Sift4G

Uncertain

0.058

T;T

Polyphen

0.31

.;B

Vest4

0.31

MutPred

0.71

.;Gain of methylation at K434 (P = 0.0811);

MVP

0.97

MPC

0.28

ClinPred

0.042

GERP RS

5.1

Varity_R

0.38

gMVP

0.62

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

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over