Is STAT4 p.Arg508Cys (c.1522C>T) pathogenic?

STAT4 p.Arg508Cys (c.1522C>T) is classified Uncertain significance in STAT4 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-09-03). AlphaMissense: ambiguous (0.3562); Very rare (popmax 0.00329%, sas).

How common is STAT4 p.Arg508Cys (c.1522C>T) in the general population?

STAT4 p.Arg508Cys (c.1522C>T) is very rare (popmax 0.00329%, sas) (gnomAD).

What do computational predictors say about STAT4 p.Arg508Cys (c.1522C>T)?

AlphaMissense predicts ambiguous (score 0.3562) — an in-silico prediction, not a clinical call.

STAT4 p.Arg508Cys

c.1522C>T · VCV4698984

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.3562 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00329%, sas)

Missense predictors

2/2 damaging

REVEL, SaProt · AlphaMissense no call

Computational evidence

Protein change
AlphaMissense	0.3562	ambiguous
REVEL	0.699	pathogenic-leaning
SaProt	LLR -11.90	damaging
⇒ REVEL and SaProt both call this damaging; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	GERP 0.052, phastCons 1
Regional constraint	o/e 0.77	unconstrained · MANE · 114 kb · p 8.5e-09 · regional, not allelic
Overall
CADD	33.0	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00329% South Asian · 3/91,064 alleles

Filtering AF 0.000875% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000443%

Overall 0.000342% 5/1,461,866 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00329%	30,355
European (non-Finnish)	0.000169%	590,009

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: STAT4
Protein: p.Arg508Cys
Coding: c.1522C>T
MANE Select: NM_003151
Type: single nucleotide variant
Location: chr2:191036212 (GRCh38)
Gene constraint: LOEUF 0.503 · pLI 0.93 (gnomAD)
Structure: AlphaFold pLDDT 86.87

Full STAT4 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

STAT4 p.Arg508His Uncertain significance ★ ⚠ same residue
STAT4 p.Ala245Thr Uncertain significance ★★ ⚠ same type
STAT4 p.Arg241Gln Uncertain significance ★★ ⚠ same type
STAT4 p.Arg70Leu Uncertain significance ★★ ⚠ same type
STAT4 p.Arg87Lys Uncertain significance ★★ ⚠ same type
STAT4 p.Asp513Val Uncertain significance ★★ ⚠ same type
STAT4 p.Cys323Arg Uncertain significance ★★ ⚠ same type
STAT4 p.Gln243Lys Uncertain significance ★★ ⚠ 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/stat4-p-arg508cys (accessed [today's date]).

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