Is PGAP1 p.Ile644Met (c.1932T>G) pathogenic?

PGAP1 p.Ile644Met (c.1932T>G) is classified Uncertain significance in PGAP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-06-18). AlphaMissense: likely benign (0.0918); Very rare (popmax 0.00539%, amr); Associated with Inborn genetic diseases.

What condition is associated with PGAP1 p.Ile644Met (c.1932T>G)?

PGAP1 p.Ile644Met (c.1932T>G) is associated with Inborn genetic diseases (ClinVar).

How common is PGAP1 p.Ile644Met (c.1932T>G) in the general population?

PGAP1 p.Ile644Met (c.1932T>G) is very rare (popmax 0.00539%, amr) (gnomAD).

What do computational predictors say about PGAP1 p.Ile644Met (c.1932T>G)?

AlphaMissense predicts likely benign (score 0.0918) — an in-silico prediction, not a clinical call.

PGAP1 p.Ile644Met

c.1932T>G · VCV4135146

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0918 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00539%, amr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Inborn genetic diseases

Computational evidence

Protein change
AlphaMissense	0.0918	likely benign
REVEL	0.088	moderately benign-leaning
SaProt	LLR -7.68	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.5	GERP 0.13, phastCons 1
Regional constraint	o/e 0.92	unconstrained · MANE · 85 kb · p 0.0064 · regional, not allelic
Overall
CADD	19.16	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00539% Admixed American · 3/55,616 alleles

Filtering AF 0.00143% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000978%

Overall 0.00163% 26/1,592,288 alleles · very rare exomes 22/1,440,160 · genomes 4/152,128 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00539%	18,539
European (non-Finnish)	0.00179%	55,789
Remaining individualsnot grpmax-eligible	0.00162%	61,562
African / African-American	0.00135%	73,858

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.Ile644Met
Coding: c.1932T>G
MANE Select: NM_024989
Type: single nucleotide variant
Location: chr2:196847967 (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

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

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PGAP1 p.Arg803His Uncertain significance ★★ ⚠ same condition
PGAP1 p.Arg814Cys Uncertain significance ★★ ⚠ same condition
PGAP1 p.Asn129Ser Uncertain significance ★★ ⚠ same condition
PGAP1 p.Asn363Asp Uncertain significance ★★ ⚠ same condition
PGAP1 p.His261Tyr 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-ile644met (accessed [today's date]).

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