Is STAT3 p.Ala766= (c.2298T>C) pathogenic?

STAT3 p.Ala766= (c.2298T>C) is classified Likely benign in STAT3 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-09-03). Very rare (popmax 0.00102%, nfe); Associated with hyper-IgE recurrent infection syndrome 1, autosomal dominant.

What condition is associated with STAT3 p.Ala766= (c.2298T>C)?

STAT3 p.Ala766= (c.2298T>C) is associated with hyper-IgE recurrent infection syndrome 1, autosomal dominant (ClinVar).

How common is STAT3 p.Ala766= (c.2298T>C) in the general population?

STAT3 p.Ala766= (c.2298T>C) is very rare (popmax 0.00102%, nfe) (gnomAD).

STAT3 p.Ala766=

Q: How is Autosomal dominant hyper-IgE syndrome due to STAT3 deficiency inherited?

Typically Autosomal dominant (Orphanet). A genetic counselor can assess individual risk for a family.

c.2298T>C · rs1243900024 · VCV1152705

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00102%, nfe)

Conditions

hyper-IgE recurrent infection syndrome 1, autosomal dominant

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.33	GERP -0.66, phastCons 0.041
Overall
CADD	10.21	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00102% European (non-Finnish) · 12/1,179,992 alleles

Filtering AF 0.000542% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000428%

Overall 0.000744% 12/1,613,912 alleles · very rare

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: STAT3
Protein: p.Ala766=
Coding: c.2298T>C
MANE Select: NM_139276
dbSNP: rs1243900024
Type: single nucleotide variant
Location: chr17:42315760 (GRCh38)
Gene constraint: LOEUF 0.109 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 85.80 · 6 PDB

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

Disease context

hyper-IgE recurrent infection syndrome 1, autosomal dominant — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autosomal dominant hyper-IgE syndrome due to STAT3 deficiency (Orphanet):

Inheritance: Autosomal dominant
Onset: Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

STAT3 p.Ala766Thr Likely benign ★★ same residue
STAT3 p.Ala766Gly Uncertain significance ★ ⚠ same residue
STAT3 p.Ala766Val Conflicting classifications of pathogenicity ★ ⚠ 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

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-ala766 (accessed [today's date]).

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