Is PGAP1 p.Ile303Thr (c.908T>C) pathogenic?

PGAP1 p.Ile303Thr (c.908T>C) is classified Uncertain significance in PGAP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-11-11). AlphaMissense: likely benign (0.2213); Very rare (popmax 8.65e-05%, nfe); Associated with intellectual disability, autosomal recessive 42.

What condition is associated with PGAP1 p.Ile303Thr (c.908T>C)?

PGAP1 p.Ile303Thr (c.908T>C) is associated with intellectual disability, autosomal recessive 42 (ClinVar).

How common is PGAP1 p.Ile303Thr (c.908T>C) in the general population?

PGAP1 p.Ile303Thr (c.908T>C) is very rare (popmax 8.65e-05%, nfe) (gnomAD).

What do computational predictors say about PGAP1 p.Ile303Thr (c.908T>C)?

AlphaMissense predicts likely benign (score 0.2213) — an in-silico prediction, not a clinical call.

PGAP1 p.Ile303Thr

c.908T>C · rs2468676035 · VCV2885113

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2213 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.65e-05%, nfe)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

intellectual disability, autosomal recessive 42

Computational evidence

Protein change
AlphaMissense	0.2213	likely benign
REVEL	0.29	benign-leaning
SaProt	LLR -10.68	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 1.5, phastCons 1
Regional constraint	o/e 0.92	unconstrained · MANE · 85 kb · p 0.0064 · regional, not allelic
Overall
CADD	24.0	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

Grpmax group 8.65e-05% European (non-Finnish) · 1/1,156,684 alleles

Overall 6.34e-05% 1/1,578,054 alleles · very rare exomes 1/1,425,760 · genomes 0/152,294 · joint denominator

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: PGAP1
Protein: p.Ile303Thr
Coding: c.908T>C
MANE Select: NM_024989
dbSNP: rs2468676035
Type: single nucleotide variant
Location: chr2:196897150 (GRCh38)
Gene constraint: LOEUF 0.691 · pLI 0.02 (gnomAD)
Structure: AlphaFold pLDDT 89.15

Full PGAP1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

intellectual disability, autosomal recessive 42 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

PGAP1 p.Gln466Ter Pathogenic ★★ same condition
PGAP1 p.Gln555Ter Pathogenic/Likely pathogenic ★★ same condition
PGAP1 p.Tyr758Ter Pathogenic/Likely pathogenic ★★ same condition
PGAP1 p.Ala298Thr Uncertain significance ★★ ⚠ same condition
PGAP1 p.Ala714Val Uncertain significance ★★ ⚠ same condition
PGAP1 p.Arg231Gln Uncertain significance ★★ ⚠ same condition
PGAP1 p.Arg250His Uncertain significance ★★ ⚠ same condition
PGAP1 p.Arg803Cys 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/pgap1-p-ile303thr (accessed [today's date]).

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