Is GAA p.Pro86Ser (c.256C>T) pathogenic?

GAA p.Pro86Ser (c.256C>T) is classified Uncertain significance in GAA (ClinVar, Single submitter, 1 submitter; last evaluated 2024-06-16). AlphaMissense: likely benign (0.0886); Very rare (popmax 0.00017%, nfe).

How common is GAA p.Pro86Ser (c.256C>T) in the general population?

GAA p.Pro86Ser (c.256C>T) is very rare (popmax 0.00017%, nfe) (gnomAD).

What do computational predictors say about GAA p.Pro86Ser (c.256C>T)?

AlphaMissense predicts likely benign (score 0.0886) — an in-silico prediction, not a clinical call.

GAA p.Pro86Ser

c.256C>T · VCV3390381

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0886 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00017%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0886	likely benign
REVEL	0.139	moderately benign-leaning
SaProt	LLR -5.36	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 4.7	GERP 0.14, phastCons 1
Regional constraint	o/e 1.03	unconstrained · MANE · 15 kb · p 0.22 · regional, not allelic
Overall
CADD	18.61	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 0.00017% European (non-Finnish) · 2/1,179,922 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000124% 2/1,612,870 alleles · very rare exomes 2/1,460,518 · genomes 0/152,352 · 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: GAA
Protein: p.Pro86Ser
Coding: c.256C>T
MANE Select: NM_000152
Type: single nucleotide variant
Location: chr17:80104842 (GRCh38)
Gene constraint: LOEUF 1.008 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 92.32 · 19 PDB
Residue 86: an α-helix; the p-type domain

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

Similar variants

GAA p.Pro86His Uncertain significance ★★ ⚠ same residue
GAA p.Pro86Arg Conflicting classifications of pathogenicity ★ ⚠ same residue
GAA p.Pro86= Likely benign ★ same residue
GAA c.1076-1G>C Pathogenic ★★★ same type
GAA c.1076-22T>G Pathogenic ★★★ same type
GAA c.1194+5G>A Likely pathogenic ★★★ same type
GAA c.1326+1G>A Pathogenic ★★★ same type
GAA c.1327-2A>G Pathogenic ★★★ same type

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/gaa-p-pro86ser (accessed [today's date]).

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