Is PGAP1 p.Lys881Arg (c.2642A>G) pathogenic?

PGAP1 p.Lys881Arg (c.2642A>G) is classified Uncertain significance in PGAP1 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-11-01). AlphaMissense: likely benign (0.0752); Ultra-rare (popmax 0.0293%, nfe); Associated with intellectual disability, autosomal recessive 42.

What condition is associated with PGAP1 p.Lys881Arg (c.2642A>G)?

PGAP1 p.Lys881Arg (c.2642A>G) is associated with intellectual disability, autosomal recessive 42 (ClinVar).

How common is PGAP1 p.Lys881Arg (c.2642A>G) in the general population?

PGAP1 p.Lys881Arg (c.2642A>G) is ultra-rare (popmax 0.0293%, nfe) (gnomAD).

What do computational predictors say about PGAP1 p.Lys881Arg (c.2642A>G)?

AlphaMissense predicts likely benign (score 0.0752) — an in-silico prediction, not a clinical call.

PGAP1 p.Lys881Arg

c.2642A>G · rs375115788 · VCV1011201

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0752 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0293%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

intellectual disability, autosomal recessive 42

Computational evidence

Protein change
AlphaMissense	0.0752	likely benign
REVEL	0.044	moderately benign-leaning
SaProt	LLR -6.77	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	Δ0.26	acceptor loss · deltas
Constraint at this position
Conservation	phyloP 2.8	GERP 0.49, phastCons 1
Regional constraint	o/e 0.92	unconstrained · MANE · 85 kb · p 0.0064 · regional, not allelic
Overall
CADD	22.5	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 0.0293% European (non-Finnish) · 345/1,179,264 alleles

Filtering AF 0.0266% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0256%

Overall 0.0223% 359/1,612,748 alleles · ultra-rare exomes 333/1,460,532 · genomes 26/152,216 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0293%	3,418
Remaining individualsnot grpmax-eligible	0.00961%	10,407
African / African-American	0.00935%	10,696
Admixed American	0.00167%	59,874

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.Lys881Arg
Coding: c.2642A>G
MANE Select: NM_024989
dbSNP: rs375115788
Type: single nucleotide variant
Location: chr2:196841361 (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.Lys881Asn Uncertain significance ★ ⚠ same residue
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

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-lys881arg (accessed [today's date]).

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