Genetic Variant NM_000274.4:c.952delG (chr10-124401787-TC-T) – ACMG Classification: Pathogenic (18 pts)

Variant summary

Our verdict is Pathogenic. The variant received 18 ACMG points: 18P and 0B. PVS1PM2PP5_Very_Strong

The NM_000274.4(OAT):c.952delG(p.Glu318SerfsTer11) variant causes a frameshift change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

OAT
NM_000274.4 frameshift

Scores

Not classified

Clinical Significance

Pathogenic criteria provided, multiple submitters, no conflicts P:3

Conservation

PhyloP100: 7.50

Publications

2 publications found

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 Gene-Disease associations (from GenCC):

ornithine aminotransferase deficiency
Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, Labcorp Genetics (formerly Invitae), G2P, Orphanet

OAT links:

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ACMG classification

Classification was made for transcript

Our verdict: Pathogenic. The variant received 18 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

PM2

Very rare variant in population databases, with high coverage;

PP5

Variant 10-124401787-TC-T is Pathogenic according to our data. Variant chr10-124401787-TC-T is described in ClinVar as [Pathogenic]. Clinvar id is 56139.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
OAT	NM_000274.4 link	c.952delG	p.Glu318SerfsTer11	frameshift_variant	Exon 8 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.952delG	p.Glu318SerfsTer11	frameshift_variant	Exon 8 of 10	1	NM_000274.4	ENSP00000357838.5	P04181-1
OAT	ENST00000539214.5 link	c.538delG	p.Glu180SerfsTer11	frameshift_variant	Exon 7 of 9	1		ENSP00000439042.1	P04181-2
OAT	ENST00000467675.5 link	n.753delG		non_coding_transcript_exon_variant	Exon 7 of 7	5
OAT	ENST00000471127.1 link	n.462delG		non_coding_transcript_exon_variant	Exon 2 of 4	2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

1461082

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726880

African (AFR)

AF:

0.00

AC:

AN:

33472

American (AMR)

AF:

0.00

AC:

AN:

44716

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26130

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86248

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52860

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111818

Other (OTH)

AF:

0.00

AC:

AN:

60376

GnomAD4 genome

Cov.:

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Ornithine aminotransferase deficiency

Pathogenic:3

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

Significance:Likely pathogenic

Review Status:no assertion criteria provided

Collection Method:literature only

- -

Apr 17, 2023

Baylor Genetics

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Oct 29, 2021

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Pathogenic

Review Status:criteria provided, single submitter

Collection Method:clinical testing

For these reasons, this variant has been classified as Pathogenic. ClinVar contains an entry for this variant (Variation ID: 56139). This premature translational stop signal has been observed in individual(s) with OAT-related conditions (PMID: 1737786). This variant is not present in population databases (gnomAD no frequency). This sequence change creates a premature translational stop signal (p.Glu318Serfs*11) in the OAT gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in OAT are known to be pathogenic (PMID: 1737786, 23076989). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

PhyloP100

7.5

Mutation Taster

=0/200

disease causing (ClinVar)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over