Is STAT1 p.Lys673Arg (c.2018A>G) pathogenic?

STAT1 p.Lys673Arg (c.2018A>G) is classified Pathogenic in STAT1 (ClinVar, No assertion criteria, 1 submitter; last evaluated 2012-09-01). AlphaMissense: likely benign (0.1817); Absent from gnomAD v4.1; Associated with Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency.

How common is STAT1 p.Lys673Arg (c.2018A>G) in the general population?

STAT1 p.Lys673Arg (c.2018A>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about STAT1 p.Lys673Arg (c.2018A>G)?

AlphaMissense predicts likely benign (score 0.1817) — an in-silico prediction, not a clinical call.

STAT1 p.Lys673Arg

Q: What condition is associated with STAT1 p.Lys673Arg (c.2018A>G)?

STAT1 p.Lys673Arg (c.2018A>G) is associated with Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency (ClinVar).

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.2018A>G · rs587777704 · VCV155907

Pathogenic No assertion criteria

Classification

Pathogenic

ClinVar

Review

No assertion criteria ☆☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1817 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Mendelian susceptibility to mycobacterial diseases due to partial STAT1 deficiency

Computational evidence

Protein change
AlphaMissense	0.1817	likely benign ⚠ discordant with ClinVar
REVEL	0.716	pathogenic-leaning
SaProt	LLR -9.50	tolerated
⇒ REVEL calls this damaging; AlphaMissense and SaProt do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
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	26.1	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

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: STAT1
Protein: p.Lys673Arg
Coding: c.2018A>G
MANE Select: NM_007315
dbSNP: rs587777704
Type: single nucleotide variant
Location: chr2:190976881 (GRCh38)
Gene constraint: LOEUF 0.271 · pLI 1.00 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 87.78 · 10 PDB
Residue 673: an α-helix; a UniProt-annotated variant site (in imd31a; impairs tyrosine phosphorylation; results in impaired stat1-mediated cellular response to ifn-gamma and interleukin-27)

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

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

Inheritance: Autosomal dominant
Onset: Childhood

Similar variants

STAT1 p.Lys673= Benign/Likely benign ★★ same residue
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

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-lys673arg (accessed [today's date]).

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