Is STAT5B p.Arg226= (c.678C>T) pathogenic?

STAT5B p.Arg226= (c.678C>T) is classified Likely benign in STAT5B (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-01-06). Ultra-rare (popmax 0.0542%, afr); Associated with growth hormone insensitivity with immune dysregulation 1, autosomal recessive.

How common is STAT5B p.Arg226= (c.678C>T) in the general population?

STAT5B p.Arg226= (c.678C>T) is ultra-rare (popmax 0.0542%, afr) (gnomAD).

How is Laron syndrome with immunodeficiency inherited?

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

STAT5B p.Arg226=

Q: What condition is associated with STAT5B p.Arg226= (c.678C>T)?

STAT5B p.Arg226= (c.678C>T) is associated with growth hormone insensitivity with immune dysregulation 1, autosomal recessive (ClinVar).

c.678C>T · rs377043175 · VCV1090376

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0542%, afr)

Conditions

growth hormone insensitivity with immune dysregulation 1, autosomal recessive

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -5.4	GERP -1.8
Overall
CADD	6.594	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0542% African / African-American · 40/73,830 alleles

Filtering AF 0.0408% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0362%

Overall 0.00623% 100/1,605,064 alleles · ultra-rare exomes 73/1,455,606 · genomes 27/149,458 · joint denominator

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0542%	1,846
Admixed American	0.0392%	2,550
South Asian	0.0144%	6,948
Remaining individualsnot grpmax-eligible	0.0129%	7,758
East Asian	0.00225%	44,446
European (non-Finnish)	0.00127%	78,486

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: STAT5B
Protein: p.Arg226=
Coding: c.678C>T
MANE Select: NM_012448
dbSNP: rs377043175
Type: single nucleotide variant
Location: chr17:42219715 (GRCh38)
Gene constraint: LOEUF 0.277 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 85.90 · 2 PDB
Residue 226: an α-helix

Full STAT5B gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

growth hormone insensitivity with immune dysregulation 1, autosomal recessive — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Laron syndrome with immunodeficiency (Orphanet):

Inheritance: Autosomal dominant, Autosomal recessive
Onset: Childhood, Infancy, Neonatal

Similar variants

STAT5B p.Arg226Cys Uncertain significance ★★ ⚠ same residue
STAT5B p.Arg226His Uncertain significance ★★ ⚠ same residue
STAT5B c.1906+1G>A Likely pathogenic ★★ same condition
STAT5B p.Ala20Glu Uncertain significance ★★ ⚠ same condition
STAT5B p.Ala20Val Uncertain significance ★★ ⚠ same condition
STAT5B p.Ala213Gly Uncertain significance ★★ ⚠ same condition
STAT5B p.Ala213Ser Uncertain significance ★★ ⚠ same condition
STAT5B p.Ala723Thr 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/stat5b-p-arg226 (accessed [today's date]).

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