Is ITCH p.Ala605Pro (c.1813G>C) pathogenic?

ITCH p.Ala605Pro (c.1813G>C) is classified Uncertain significance in ITCH (ClinVar, Single submitter, 1 submitter; last evaluated 2022-04-28). AlphaMissense: likely pathogenic (0.997); Absent from gnomAD v4.1; Associated with syndromic multisystem autoimmune disease due to ITCH deficiency.

What condition is associated with ITCH p.Ala605Pro (c.1813G>C)?

ITCH p.Ala605Pro (c.1813G>C) is associated with syndromic multisystem autoimmune disease due to ITCH deficiency (ClinVar).

How common is ITCH p.Ala605Pro (c.1813G>C) in the general population?

ITCH p.Ala605Pro (c.1813G>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about ITCH p.Ala605Pro (c.1813G>C)?

AlphaMissense predicts likely pathogenic (score 0.997) — an in-silico prediction, not a clinical call.

ITCH p.Ala605Pro

Q: How is Syndromic multisystem autoimmune disease due to Itch deficiency inherited?

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

c.1813G>C · rs80241710 · VCV2128157

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.997 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

syndromic multisystem autoimmune disease due to ITCH deficiency

Computational evidence

Protein change
AlphaMissense	0.997	likely pathogenic · top 9% in ITCH
REVEL	0.741	pathogenic-leaning
SaProt	LLR -16.55	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 10	GERP 2.1, phastCons 1
Regional constraint	o/e 0.53	unconstrained · MANE · 68 kb · p 1.5e-36 · regional, not allelic
Overall
CADD	33.0	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM A646P vs ClinVar A605P) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: ITCH
Protein: p.Ala605Pro
Coding: c.1813G>C
MANE Select: NM_031483
dbSNP: rs80241710
Type: single nucleotide variant
Location: chr20:34479784 (GRCh38)
Gene constraint: LOEUF 0.343 · pLI 1.00 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 76.39 · 12 PDB
Residue 605: the hect domain

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

Disease context

syndromic multisystem autoimmune disease due to ITCH deficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Syndromic multisystem autoimmune disease due to Itch deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

ITCH p.Ala605= Likely benign ★ same residue
ITCH c.1952+6T>C Uncertain significance ★★ same condition
ITCH p.Arg192Ser Uncertain significance ★★ ⚠ same condition
ITCH p.Arg217Gln Uncertain significance ★★ ⚠ same condition
ITCH p.Arg224Cys Uncertain significance ★★ ⚠ same condition
ITCH p.Arg763Ser Uncertain significance ★★ ⚠ same condition
ITCH p.Arg82Gly Uncertain significance ★★ ⚠ same condition
ITCH p.Arg82His 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/itch-p-ala605pro (accessed [today's date]).

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