Is ITK p.Tyr225= (c.675T>C) pathogenic?

ITK p.Tyr225= (c.675T>C) is classified Likely benign in ITK (ClinVar, Multiple submitters, 3 submitters; last evaluated 2025-12-09). Ultra-rare (popmax 0.0498%, mid); Associated with lymphoproliferative syndrome 1.

What condition is associated with ITK p.Tyr225= (c.675T>C)?

ITK p.Tyr225= (c.675T>C) is associated with lymphoproliferative syndrome 1 (ClinVar).

How common is ITK p.Tyr225= (c.675T>C) in the general population?

ITK p.Tyr225= (c.675T>C) is ultra-rare (popmax 0.0498%, mid) (gnomAD).

How is Combined immunodeficiency due to ITK deficiency inherited?

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

ITK p.Tyr225=

c.675T>C · rs767930063 · VCV1097683

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0498%, mid)

Conditions

lymphoproliferative syndrome 1

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 -0.4	GERP -3.9, phastCons 0.17
Overall
CADD	4.392	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0498% Middle Eastern · 3/6,020 alleles

Filtering AF 0.0135% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00723%

Overall 0.00218% 35/1,606,584 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0498%	2,007
African / African-American	0.012%	8,321
Remaining individualsnot grpmax-eligible	0.00803%	12,453
Admixed American	0.00333%	30,004
South Asian	0.0033%	30,310
European (non-Finnish)	0.00111%	90,248

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: ITK
Protein: p.Tyr225=
Coding: c.675T>C
MANE Select: NM_005546
dbSNP: rs767930063
Type: single nucleotide variant
Location: chr5:157228323 (GRCh38)
Gene constraint: LOEUF 0.644 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 84.82 · 37 PDB
Residue 225: the sh3 domain; an α-helix

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

Disease context

lymphoproliferative syndrome 1 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Combined immunodeficiency due to ITK deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Childhood

Similar variants

ITK p.Tyr225Cys Uncertain significance ★ ⚠ same residue
ITK c.851+5G>A Uncertain significance ★★ same condition
ITK p.Ala191Thr Uncertain significance ★★ ⚠ same condition
ITK p.Ala261Thr Uncertain significance ★★ ⚠ same condition
ITK p.Ala308Ser Uncertain significance ★★ ⚠ same condition
ITK p.Ala345Val Uncertain significance ★★ ⚠ same condition
ITK p.Ala471Thr Uncertain significance ★★ ⚠ same condition
ITK p.Ala525Thr 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/itk-p-tyr225 (accessed [today's date]).

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