Is OAT p.His408= (c.1224T>C) pathogenic?

OAT p.His408= (c.1224T>C) is classified Conflicting classifications of pathogenicity in OAT (ClinVar, Conflicting submitters, 5 submitters; last evaluated 2026-01-26). Rare (popmax 0.228%, afr); Associated with ornithine aminotransferase deficiency.

What condition is associated with OAT p.His408= (c.1224T>C)?

OAT p.His408= (c.1224T>C) is associated with ornithine aminotransferase deficiency (ClinVar).

How common is OAT p.His408= (c.1224T>C) in the general population?

OAT p.His408= (c.1224T>C) is rare (popmax 0.228%, afr) (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.His408=

c.1224T>C · rs201864147 · VCV193571

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 5 submitters

gnomAD v4.1

Rare

rare (popmax 0.228%, afr)

Conditions

ornithine aminotransferase deficiency

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -8	GERP -4.1
Overall
CADD	0.381	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.228% African / African-American · 171/75,064 alleles

Filtering AF 0.2% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.189%

Overall 0.0113% 183/1,614,122 alleles · rare exomes 75/1,461,790 · genomes 108/152,332 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.228%	439
Remaining individualsnot grpmax-eligible	0.0144%	6,945
Admixed American	0.00167%	60,026
European (non-Finnish)	0.000169%	589,984

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.His408=
Coding: c.1224T>C
MANE Select: NM_000274
dbSNP: rs201864147
Type: single nucleotide variant
Location: chr10:124398038 (GRCh38)
Gene constraint: LOEUF 0.968 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 94.29 · 35 PDB
Residue 408: a turn

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.His408Asp Uncertain significance ★ ⚠ same residue
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

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-his408 (accessed [today's date]).

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