Is OAT p.Asp309= (c.927C>T) pathogenic?

OAT p.Asp309= (c.927C>T) is classified Likely benign in OAT (ClinVar, Single submitter, 1 submitter; last evaluated 2022-08-04). Very rare (popmax 0.00223%, eas); Associated with ornithine aminotransferase deficiency.

What condition is associated with OAT p.Asp309= (c.927C>T)?

OAT p.Asp309= (c.927C>T) is associated with ornithine aminotransferase deficiency (ClinVar).

How common is OAT p.Asp309= (c.927C>T) in the general population?

OAT p.Asp309= (c.927C>T) is very rare (popmax 0.00223%, eas) (gnomAD).

How is Gyrate atrophy of choroid and retina inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

OAT p.Asp309=

c.927C>T · rs2134453354 · VCV1556062

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00223%, eas)

Conditions

ornithine aminotransferase deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -6.2	GERP -4.1
Overall
CADD	0.584	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00223% East Asian · 1/44,878 alleles

Filtering AF 0.000292% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000211%

Overall 0.000558% 9/1,613,104 alleles · very rare exomes 9/1,460,832 · genomes 0/152,272 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.00223%	44,878
European (non-Finnish)	0.000678%	147,456

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: OAT
Protein: p.Asp309=
Coding: c.927C>T
MANE Select: NM_000274
dbSNP: rs2134453354
Type: single nucleotide variant
Location: chr10:124401813 (GRCh38)
Gene constraint: LOEUF 0.968 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 94.29 · 35 PDB
Residue 309: an α-helix

Full OAT gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

ornithine aminotransferase deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Gyrate atrophy of choroid and retina (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood
Prevalence: 1-9 / 100 000 (Finland)

Similar variants

OAT c.1014+1G>A Likely pathogenic ★★ same condition
OAT c.199+2T>A Likely pathogenic ★★ same condition
OAT c.425-2A>G Pathogenic ★★ same condition
OAT c.520+1G>A Likely pathogenic ★★ same condition
OAT c.648+1G>A Likely pathogenic ★★ same condition
OAT c.772-1G>A Pathogenic/Likely pathogenic ★★ same condition
OAT c.900+1G>A Pathogenic/Likely pathogenic ★★ same condition
OAT p.Arg180Thr Pathogenic/Likely pathogenic ★★ same condition

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/oat-p-asp309 (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown