Is STAT3 p.Pro669Ser (c.2005C>T) pathogenic?

STAT3 p.Pro669Ser (c.2005C>T) is classified Uncertain significance in STAT3 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-04-06). AlphaMissense: likely pathogenic (0.9992); Absent from gnomAD v4.1; Associated with STAT3 gain of function.

What condition is associated with STAT3 p.Pro669Ser (c.2005C>T)?

STAT3 p.Pro669Ser (c.2005C>T) is associated with STAT3 gain of function, hyper-IgE recurrent infection syndrome 1, autosomal dominant (ClinVar).

How common is STAT3 p.Pro669Ser (c.2005C>T) in the general population?

STAT3 p.Pro669Ser (c.2005C>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about STAT3 p.Pro669Ser (c.2005C>T)?

AlphaMissense predicts likely pathogenic (score 0.9992) — an in-silico prediction, not a clinical call.

STAT3 p.Pro669Ser

c.2005C>T · rs2144680063 · VCV2122125

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9992 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

STAT3 gain of function

Computational evidence

Protein change
AlphaMissense	0.9992	likely pathogenic · top 3% in STAT3
REVEL	0.716	pathogenic-leaning
SaProt	LLR -12.26	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 1.9, phastCons 1
Regional constraint	o/e 0.13	constrained · MANE · 716 bp · p 9e-16 · regional, not allelic
Overall
CADD	33.0	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — 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

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: STAT3
Protein: p.Pro669Ser
Coding: c.2005C>T
MANE Select: NM_139276
dbSNP: rs2144680063
Type: single nucleotide variant
Location: chr17:42322378 (GRCh38)
Gene constraint: LOEUF 0.109 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 85.80 · 6 PDB
Residue 669: the sh2 domain

Full STAT3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

STAT3 gain of function — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: hyper-IgE recurrent infection syndrome 1, autosomal dominant

Similar variants

STAT3 p.Pro669= Likely benign ★ same residue
STAT3 p.Arg152Trp Pathogenic ★★ ⚠ same condition
STAT3 p.Arg278Cys Likely pathogenic ★★ same condition
STAT3 p.Arg335Trp Pathogenic/Likely pathogenic ★★ same condition
STAT3 p.Arg382Gln Pathogenic ★★ same condition
STAT3 p.Arg382Trp Pathogenic ★★ same condition
STAT3 p.Arg423Gln Pathogenic ★★ ⚠ same condition
STAT3 p.Asn466Ser Pathogenic ★★ ⚠ 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/stat3-p-pro669ser (accessed [today's date]).

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