Is STAT3 p.Arg350= (c.1050G>A) pathogenic?

STAT3 p.Arg350= (c.1050G>A) is classified Uncertain significance in STAT3 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-08-20). Very rare (popmax 0.00271%, nfe); Associated with STAT3 gain of function.

What condition is associated with STAT3 p.Arg350= (c.1050G>A)?

STAT3 p.Arg350= (c.1050G>A) is associated with STAT3 gain of function, hyper-IgE recurrent infection syndrome 1, autosomal dominant (ClinVar).

How common is STAT3 p.Arg350= (c.1050G>A) in the general population?

STAT3 p.Arg350= (c.1050G>A) is very rare (popmax 0.00271%, nfe) (gnomAD).

STAT3 p.Arg350=

c.1050G>A · rs771738153 · VCV891205

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00271%, nfe)

Conditions

STAT3 gain of function

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 0.65	GERP -1.5, phastCons 1
Overall
CADD	13.91	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00271% European (non-Finnish) · 32/1,179,716 alleles

Filtering AF 0.00196% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00168%

Overall 0.00205% 33/1,613,468 alleles · very rare

Ancestry group	Frequency	1 in
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,592
European (non-Finnish)grpmax	0.00271%	36,866

Ashkenazi Jewish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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.Arg350=
Coding: c.1050G>A
MANE Select: NM_139276
dbSNP: rs771738153
Type: single nucleotide variant
Location: chr17:42331531 (GRCh38)
Gene constraint: LOEUF 0.109 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 85.80 · 6 PDB
Residue 350: a β-strand

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.Arg350Met Uncertain significance ★ ⚠ 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-arg350 (accessed [today's date]).

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