Is OGT p.Pro657Ala (c.1969C>G) pathogenic?

OGT p.Pro657Ala (c.1969C>G) is classified Uncertain significance in OGT (ClinVar, Single submitter, 1 submitter). AlphaMissense: ambiguous (0.469); Absent from gnomAD v4.1; Associated with intellectual disability, X-linked 106.

What condition is associated with OGT p.Pro657Ala (c.1969C>G)?

OGT p.Pro657Ala (c.1969C>G) is associated with intellectual disability, X-linked 106 (ClinVar).

How common is OGT p.Pro657Ala (c.1969C>G) in the general population?

OGT p.Pro657Ala (c.1969C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about OGT p.Pro657Ala (c.1969C>G)?

AlphaMissense predicts ambiguous (score 0.469) — an in-silico prediction, not a clinical call.

OGT p.Pro657Ala

c.1969C>G · VCV3382475

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.469 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/2 damaging

REVEL, SaProt · AlphaMissense no call

Conditions

intellectual disability, X-linked 106

Computational evidence

Protein change
AlphaMissense	0.469	ambiguous
REVEL	0.826	moderately pathogenic-leaning
SaProt	LLR -12.79	damaging
⇒ REVEL and SaProt both call this damaging; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.6	GERP 1.9, phastCons 1
Regional constraint	o/e 0.24	constrained · MANE · 15 kb · p 7.2e-55 · regional, not allelic
Overall
CADD	25.1	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: OGT
Protein: p.Pro657Ala
Coding: c.1969C>G
MANE Select: NM_181672
Type: single nucleotide variant
Location: chrX:71561892 (GRCh38)
Structure: AlphaFold pLDDT 93.41 · 44 PDB
Residue 657: a β-strand

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

Disease context

intellectual disability, X-linked 106 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

OGT p.Thr932Ile Likely pathogenic ★★ same condition
OGT p.Arg117Cys Uncertain significance ★★ same condition
OGT p.Arg627Cys Uncertain significance ★★ ⚠ same condition
OGT p.Asn898Ser Uncertain significance ★★ ⚠ same condition
OGT p.Ile211Val Uncertain significance ★★ ⚠ same condition
OGT p.Leu303Phe Uncertain significance ★★ same condition
OGT p.Lys1010Arg Uncertain significance ★★ ⚠ same condition
OGT p.Thr570Ala Uncertain significance ★★ ⚠ 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/ogt-p-pro657ala (accessed [today's date]).

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