STAT2 p.Leu127=

Q: Is STAT2 p.Leu127= (c.379T>C) pathogenic?

STAT2 p.Leu127= (c.379T>C) is classified Benign in STAT2 (ClinVar, Multiple submitters, 5 submitters; last evaluated 2026-01-27). Common (popmax 5.12%, afr) — too common for a highly-penetrant pathogenic allele; Associated with primary immunodeficiency with post-measles-mumps-rubella vaccine viral infection.

Q: What condition is associated with STAT2 p.Leu127= (c.379T>C)?

STAT2 p.Leu127= (c.379T>C) is associated with primary immunodeficiency with post-measles-mumps-rubella vaccine viral infection (ClinVar).

Q: How common is STAT2 p.Leu127= (c.379T>C) in the general population?

STAT2 p.Leu127= (c.379T>C) is common (popmax 5.12%, afr) — too common for a highly-penetrant pathogenic allele (gnomAD).

Q: How is Primary immunodeficiency with post-measles-mumps-rubella vaccine viral infection inherited?

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

c.379T>C · rs2066812 · VCV475693

Benign Multiple submitters

Classification

Benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 5 submitters

gnomAD v4.1

Common

common (popmax 5.12%, afr) — too common for a highly-penetrant pathogenic allele

Conditions

primary immunodeficiency with post-measles-mumps-rubella vaccine viral infection

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 0.21	GERP -3.5
Overall
CADD	2.442	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 5.12% African / African-American · 3,840/74,968 alleles

Filtering AF 4.99% ClinGen BA1/BS1 input FAF95, joint · FAF99 4.93%

Overall 0.268% 4,318/1,613,946 alleles · common exomes 2,053/1,461,762 · genomes 2,265/152,184 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	5.12%	20
Remaining individualsnot grpmax-eligible	0.354%	283
Admixed American	0.305%	328
Middle Eastern	0.181%	551
South Asian	0.011%	9,107
European (non-Finnish)	0.00449%	22,262

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: STAT2
Protein: p.Leu127=
Coding: c.379T>C
MANE Select: NM_005419
dbSNP: rs2066812
Type: single nucleotide variant
Location: chr12:56355710 (GRCh38)
Gene constraint: LOEUF 0.497 · pLI 0.81 (gnomAD)
Structure: AlphaFold pLDDT 78.45 · 6 PDB

Full STAT2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

primary immunodeficiency with post-measles-mumps-rubella vaccine viral infection — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Primary immunodeficiency with post-measles-mumps-rubella vaccine viral infection (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy

Similar variants

STAT2 p.Arg667Ter Pathogenic/Likely pathogenic ★★ same condition
STAT2 p.Gln274Ter Pathogenic/Likely pathogenic ★★ same condition
STAT2 p.Ala219Thr Uncertain significance ★★ ⚠ same condition
STAT2 p.Ala302Thr Uncertain significance ★★ ⚠ same condition
STAT2 p.Arg300Cys Uncertain significance ★★ ⚠ same condition
STAT2 p.Arg330Gln Uncertain significance ★★ ⚠ same condition
STAT2 p.Arg409His Uncertain significance ★★ ⚠ same condition
STAT2 p.Arg510Gln Uncertain significance ★★ ⚠ 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/stat2-p-leu127 (accessed [today's date]).

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