Is ITK p.Thr110= (c.330G>A) pathogenic?

ITK p.Thr110= (c.330G>A) is classified Likely benign in ITK (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-12-21). Very rare (popmax 0.0022%, sas); Associated with lymphoproliferative syndrome 1.

What condition is associated with ITK p.Thr110= (c.330G>A)?

ITK p.Thr110= (c.330G>A) is associated with lymphoproliferative syndrome 1 (ClinVar).

How common is ITK p.Thr110= (c.330G>A) in the general population?

ITK p.Thr110= (c.330G>A) is very rare (popmax 0.0022%, sas) (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.Thr110=

c.330G>A · rs1754250689 · VCV1123249

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.0022%, sas)

Conditions

lymphoproliferative syndrome 1

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · G>T here scores Δ0.22 · evaluated, not missing
Constraint at this position
Conservation	phyloP -5.4	GERP -3.9
Overall
CADD	1.842	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0022% South Asian · 2/91,042 alleles

Filtering AF 0.000616% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000474%

Overall 0.000993% 16/1,611,898 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0022%	45,521
Remaining individualsnot grpmax-eligible	0.0016%	62,400
European (non-Finnish)	0.0011%	90,626

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.Thr110=
Coding: c.330G>A
MANE Select: NM_005546
dbSNP: rs1754250689
Type: single nucleotide variant
Location: chr5:157214195 (GRCh38)
Gene constraint: LOEUF 0.644 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 84.82 · 37 PDB
Residue 110: the ph domain

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.Thr110Met 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-thr110 (accessed [today's date]).

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