Is STAT1 p.Ile648Val (c.1942A>G) pathogenic?

STAT1 p.Ile648Val (c.1942A>G) is classified Uncertain significance in STAT1 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-10-02). AlphaMissense: likely benign (0.1908); Very rare (popmax 0.0022%, nfe); Associated with immunodeficiency 31B.

How common is STAT1 p.Ile648Val (c.1942A>G) in the general population?

STAT1 p.Ile648Val (c.1942A>G) is very rare (popmax 0.0022%, nfe) (gnomAD).

What do computational predictors say about STAT1 p.Ile648Val (c.1942A>G)?

AlphaMissense predicts likely benign (score 0.1908) — an in-silico prediction, not a clinical call.

STAT1 p.Ile648Val

Q: What condition is associated with STAT1 p.Ile648Val (c.1942A>G)?

STAT1 p.Ile648Val (c.1942A>G) is associated with immunodeficiency 31B, autoimmune enteropathy and endocrinopathy - susceptibility to chronic infections syndrome, Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency (ClinVar).

Q: How is Susceptibility to viral and mycobacterial infections due to STAT1 deficiency inherited?

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

c.1942A>G · rs369876674 · VCV2118476

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1908 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0022%, nfe)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

immunodeficiency 31B

Computational evidence

Protein change
AlphaMissense	0.1908	likely benign
REVEL	0.699	pathogenic-leaning
SaProt	LLR -8.34	tolerated
⇒ REVEL calls this damaging; AlphaMissense and SaProt do not.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP 7.9	GERP 1.8, phastCons 1
Regional constraint	o/e 0.42	unconstrained · MANE · 15 kb · p 1.6e-32 · regional, not allelic
Overall
CADD	25.9	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 0.0022% European (non-Finnish) · 26/1,180,044 alleles

Filtering AF 0.00153% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0013%

Overall 0.00161% 26/1,614,126 alleles · very rare exomes 25/1,461,878 · genomes 1/152,248 · 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: STAT1
Protein: p.Ile648Val
Coding: c.1942A>G
MANE Select: NM_007315
dbSNP: rs369876674
Type: single nucleotide variant
Location: chr2:190976957 (GRCh38)
Gene constraint: LOEUF 0.271 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 87.78 · 10 PDB
Residue 648: an α-helix; the sh2 domain

Full STAT1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

immunodeficiency 31B — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: autoimmune enteropathy and endocrinopathy - susceptibility to chronic infections syndrome Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency

For Susceptibility to viral and mycobacterial infections due to STAT1 deficiency (Orphanet):

Inheritance: Autosomal recessive

Similar variants

STAT1 p.Ala267Val Pathogenic ★★ ⚠ same condition
STAT1 p.Arg274Gln Pathogenic ★★ ⚠ same condition
STAT1 p.Arg274Gly Pathogenic/Likely pathogenic ★★ same condition
STAT1 p.Arg274Trp Pathogenic ★★ same condition
STAT1 p.Asp171Asn Likely pathogenic ★★ ⚠ same condition
STAT1 p.Asp292Glu Likely pathogenic ★★ ⚠ same condition
STAT1 p.Cys324Arg Likely pathogenic ★★ same condition
STAT1 p.Gln271Pro Pathogenic/Likely 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/stat1-p-ile648val (accessed [today's date]).

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