Is STAT1 p.Ala267= (c.801G>A) pathogenic?

STAT1 p.Ala267= (c.801G>A) is classified Likely benign in STAT1 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-06-15). Ultra-rare (popmax 0.0401%, eas); Associated with Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency.

What condition is associated with STAT1 p.Ala267= (c.801G>A)?

STAT1 p.Ala267= (c.801G>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.Ala267= (c.801G>A) in the general population?

STAT1 p.Ala267= (c.801G>A) is ultra-rare (popmax 0.0401%, eas) (gnomAD).

STAT1 p.Ala267=

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.801G>A · rs146141778 · VCV1082975

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0401%, eas)

Conditions

Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency

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 -20	GERP -3.7
Overall
CADD	0.326	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0401% East Asian · 18/44,868 alleles

Filtering AF 0.0259% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0214%

Overall 0.00297% 48/1,613,868 alleles · ultra-rare exomes 39/1,461,750 · genomes 9/152,118 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0401%	2,493
Ashkenazi Jewishnot grpmax-eligible	0.0101%	9,866
South Asian	0.00329%	30,358
Remaining individualsnot grpmax-eligible	0.0032%	31,250
European (non-Finnish)	0.00186%	53,634

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.Ala267=
Coding: c.801G>A
MANE Select: NM_007315
dbSNP: rs146141778
Type: single nucleotide variant
Location: chr2:190995204 (GRCh38)
Gene constraint: LOEUF 0.271 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 87.78 · 10 PDB
Residue 267: an α-helix; a UniProt-annotated variant site (in imd31c)

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 residue
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-ala267 (accessed [today's date]).

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