Is STAT1 p.Val445Ile (c.1333G>A) pathogenic?

STAT1 p.Val445Ile (c.1333G>A) is classified Uncertain significance in STAT1 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-11-01). AlphaMissense: likely benign (0.0775); Very rare (popmax 0.0011%, sas); Associated with Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency.

What condition is associated with STAT1 p.Val445Ile (c.1333G>A)?

STAT1 p.Val445Ile (c.1333G>A) is associated with Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency, immunodeficiency 31B, autoimmune enteropathy and endocrinopathy - susceptibility to chronic infections syndrome (ClinVar).

How common is STAT1 p.Val445Ile (c.1333G>A) in the general population?

STAT1 p.Val445Ile (c.1333G>A) is very rare (popmax 0.0011%, sas) (gnomAD).

What do computational predictors say about STAT1 p.Val445Ile (c.1333G>A)?

AlphaMissense predicts likely benign (score 0.0775) — an in-silico prediction, not a clinical call.

STAT1 p.Val445Ile

Q: How is Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency inherited?

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

c.1333G>A · rs753695026 · VCV1481941

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0775 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0011%, sas)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL indeterminate

Conditions

Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency

Computational evidence

Protein change
AlphaMissense	0.0775	likely benign
REVEL	0.362	indeterminate
SaProt	LLR -6.92	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL is indeterminate.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.9	GERP -0.22, phastCons 1
Regional constraint	o/e 0.42	unconstrained · MANE · 15 kb · p 1.6e-32 · regional, not allelic
Overall
CADD	19.65	PHRED · no single calibrated threshold — expert panels disagree

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

Grpmax group 0.0011% South Asian · 1/91,080 alleles

Filtering AF 6.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.9e-05%

Overall 0.000248% 4/1,613,968 alleles · very rare exomes 4/1,461,756 · genomes 0/152,212 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0011%	91,080
European (non-Finnish)	0.000254%	393,304

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.Val445Ile
Coding: c.1333G>A
MANE Select: NM_007315
dbSNP: rs753695026
Type: single nucleotide variant
Location: chr2:190984324 (GRCh38)
Gene constraint: LOEUF 0.271 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 87.78 · 10 PDB
Residue 445: a β-strand

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

Disease context

Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: immunodeficiency 31B autoimmune enteropathy and endocrinopathy - susceptibility to chronic infections syndrome

For Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency (Orphanet):

Inheritance: Autosomal dominant
Onset: Childhood

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-val445ile (accessed [today's date]).

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