rs386833622

chr10-124401762-A-T

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.978T>A(p.Asn326Lys) 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. Variant has been reported in ClinVar as Likely pathogenic (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. N326S) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: OAT NM_000274.4 missense
• Clinical Significance: Likely pathogenic no assertion criteria provided P:1
• Conservation: PhyloP100: 0.153

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 4 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 6 uncertain in NM_000274.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994
• PP5: Variant 10-124401762-A-T is Pathogenic according to our data. Variant chr10-124401762-A-T is described in ClinVar as [Likely_pathogenic]. Clinvar id is 56140.Status of the report is no_assertion_criteria_provided, 0 stars. Variant chr10-124401762-A-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
OAT	NM_000274.4	c.978T>A	p.Asn326Lys	missense_variant	8/10	ENST00000368845.6

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
OAT	ENST00000368845.6	c.978T>A	p.Asn326Lys	missense_variant	8/10	1	NM_000274.4	P1
OAT	ENST00000539214.5	c.564T>A	p.Asn188Lys	missense_variant	7/9	1
OAT	ENST00000467675.5	n.779T>A		non_coding_transcript_exon_variant	7/7	5
OAT	ENST00000471127.1	n.488T>A		non_coding_transcript_exon_variant	2/4	2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: no assertion criteria provided

Submissions by phenotype

Ornithine aminotransferase deficiency Pathogenic:1

Likely pathogenic, no assertion criteria provided

literature only

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

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.99
BayesDel_addAF	Uncertain	0.13	D
BayesDel_noAF	Uncertain	-0.050
Cadd	Benign	16
Dann	Uncertain	0.98
Eigen	Benign	-0.26
Eigen_PC	Benign	-0.65
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Pathogenic	0.99	D;D
M_CAP	Pathogenic	0.29	D
MetaRNN	Pathogenic	0.99	D;D
MetaSVM	Pathogenic	0.84	D
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.68	T
PROVEAN	Pathogenic	-5.8	D;D
REVEL	Uncertain	0.61
Sift	Uncertain	0.0010	D;D
Sift4G	Pathogenic	0.0	D;D
Polyphen		1.0	.;D
Vest4		0.99
MutPred		0.96		.;Gain of methylation at N326 (P = 0.0037);
MVP		0.86
MPC		0.90
ClinPred		1.0	D
GERP RS		-8.0
Varity_R		0.99
gMVP		0.99

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

Other links and lift over

dbSNP: rs386833622; hg19: chr10-126090331;