chr10-124403831-T-C

Variant names:

• chr10-124403831-T-C
• NM_000274.4:c.738A>G
• OAT p.Leu246Leu

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Strong BP7

The NM_000274.4(OAT):​c.738A>G​(p.Leu246Leu) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. L246L) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: OAT NM_000274.4 synonymous
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.26
• Publications: 0 publications found

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: Orphanet, ClinGen, G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.89).
• BP7: Synonymous conserved (PhyloP=-1.26 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000274.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OAT	NM_000274.4	MANE Select	c.738A>G	p.Leu246Leu	synonymous	Exon 6 of 10	NP_000265.1	P04181-1
	OAT	NM_001322965.2		c.738A>G	p.Leu246Leu	synonymous	Exon 6 of 10	NP_001309894.1	P04181-1
	OAT	NM_001322966.2		c.738A>G	p.Leu246Leu	synonymous	Exon 7 of 11	NP_001309895.1	P04181-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	OAT	ENST00000368845.6	TSL:1 MANE Select	c.738A>G	p.Leu246Leu	synonymous	Exon 6 of 10	ENSP00000357838.5	P04181-1
	OAT	ENST00000539214.5	TSL:1	c.324A>G	p.Leu108Leu	synonymous	Exon 5 of 9	ENSP00000439042.1	P04181-2
	OAT	ENST00000921313.1		c.738A>G	p.Leu246Leu	synonymous	Exon 6 of 10	ENSP00000591372.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.89
CADD	Benign	0.15
DANN	Benign	0.54
PhyloP100		-1.3
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.8

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

hg19: chr10-126092400;