Is OAT p.Ala335fs (c.1001dup) pathogenic?

OAT p.Ala335fs (c.1001dup) is classified Pathogenic in OAT (ClinVar, Single submitter, 1 submitter; last evaluated 2021-06-18). No gnomAD frequency available for this variant; Associated with ornithine aminotransferase deficiency.

What condition is associated with OAT p.Ala335fs (c.1001dup)?

OAT p.Ala335fs (c.1001dup) is associated with ornithine aminotransferase deficiency (ClinVar).

How common is OAT p.Ala335fs (c.1001dup) in the general population?

OAT p.Ala335fs (c.1001dup) is no gnomAD frequency available for this variant (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.Ala335fs

c.1001dup · rs2134452962 · VCV1455231

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

frameshift

predicted LoF

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

ornithine aminotransferase deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function
NMD	predicted	premature termination codon in exon 8 of 10
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP -4.1	GERP -4.1

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

dbSNP / gnomAD

No gnomAD frequency available for this variant. This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: OAT
Protein: p.Ala335fs
Coding: c.1001dup
MANE Select: NM_000274
dbSNP: rs2134452962
Type: Duplication
Location: chr10:124401738 (GRCh38)
Gene constraint: LOEUF 0.968 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 94.29 · 35 PDB
Residue 335: 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 p.Ala335Ser Uncertain significance ★ ⚠ same residue
OAT p.Ala335= Likely benign ★ same residue
OAT p.Arg372fs Pathogenic/Likely pathogenic ★★ same condition
OAT p.Tyr299Ter Pathogenic/Likely pathogenic ★★ same condition
OAT c.199+11_199+16dup Benign/Likely benign ★★ same condition
OAT p.Arg331fs Pathogenic ★ same condition
OAT p.Asn117fs Likely pathogenic ★ same condition
OAT p.Lys421delinsTrpTer 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-ala335fs (accessed [today's date]).

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