Is STAT5B p.Arg241Trp (c.721C>T) pathogenic?

STAT5B p.Arg241Trp (c.721C>T) is classified Uncertain significance in STAT5B (ClinVar, Single submitter, 1 submitter; last evaluated 2020-01-20). AlphaMissense: ambiguous (0.4887); Very rare (popmax 0.00202%, amr); Associated with growth hormone insensitivity with immune dysregulation 1, autosomal recessive.

What condition is associated with STAT5B p.Arg241Trp (c.721C>T)?

STAT5B p.Arg241Trp (c.721C>T) is associated with growth hormone insensitivity with immune dysregulation 1, autosomal recessive (ClinVar).

How common is STAT5B p.Arg241Trp (c.721C>T) in the general population?

STAT5B p.Arg241Trp (c.721C>T) is very rare (popmax 0.00202%, amr) (gnomAD).

How is Laron syndrome with immunodeficiency inherited?

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

What do computational predictors say about STAT5B p.Arg241Trp (c.721C>T)?

AlphaMissense predicts ambiguous (score 0.4887) — an in-silico prediction, not a clinical call.

STAT5B p.Arg241Trp

c.721C>T · rs1418454797 · VCV1046567

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.4887 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00202%, amr)

Conditions

growth hormone insensitivity with immune dysregulation 1, autosomal recessive

Computational evidence

Protein change
AlphaMissense	0.4887	ambiguous
REVEL	0.385	indeterminate
SaProt	LLR -11.32	damaging
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 3.6	GERP -0.33, phastCons 1
Regional constraint	o/e 0.54	unconstrained · MANE · 4,042 bp · p 2.1e-06 · regional, not allelic
Overall
CADD	25.9	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

Grpmax group 0.00202% Admixed American · 1/49,390 alleles

Filtering AF 3e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000269% 4/1,487,862 alleles · very rare exomes 4/1,342,076 · genomes 0/145,786 · joint denominator

Ancestry group	Frequency	1 in
Admixed Americangrpmax	0.00202%	49,390
Remaining individualsnot grpmax-eligible	0.00173%	57,740
European (non-Finnish)	0.000181%	551,718

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.Arg241Trp
Coding: c.721C>T
MANE Select: NM_012448
dbSNP: rs1418454797
Type: single nucleotide variant
Location: chr17:42219424 (GRCh38)
Gene constraint: LOEUF 0.277 · pLI 1.00 (gnomAD)
Structure: AlphaFold pLDDT 85.90 · 2 PDB
Residue 241: an α-helix; the 'required for interaction with nmi' region

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.Arg241Gln 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
STAT5B p.Ala785Thr 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-arg241trp (accessed [today's date]).

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