Is ITPR3 p.Arg982Cys (c.2944C>T) pathogenic?

ITPR3 p.Arg982Cys (c.2944C>T) is classified Uncertain significance in ITPR3 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-07-01). AlphaMissense: likely pathogenic (0.9679); Very rare (popmax 0.0039%, nfe).

How common is ITPR3 p.Arg982Cys (c.2944C>T) in the general population?

ITPR3 p.Arg982Cys (c.2944C>T) is very rare (popmax 0.0039%, nfe) (gnomAD).

What do computational predictors say about ITPR3 p.Arg982Cys (c.2944C>T)?

AlphaMissense predicts likely pathogenic (score 0.9679) — an in-silico prediction, not a clinical call.

ITPR3 p.Arg982Cys

c.2944C>T · VCV4083992

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9679 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0039%, nfe)

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.9679	likely pathogenic
REVEL	0.695	pathogenic-leaning
SaProt	LLR -5.91	tolerated
⇒ AlphaMissense and REVEL call this damaging; SaProt does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4	GERP 1.1, phastCons 1
Regional constraint	o/e 0.81	unconstrained · MANE · 14 kb · p 5e-11 · regional, not allelic
Overall
CADD	33.0	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 0.0039% European (non-Finnish) · 46/1,180,000 alleles

Filtering AF 0.00299% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00267%

Overall 0.00297% 48/1,614,006 alleles · very rare exomes 44/1,461,812 · genomes 4/152,194 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0039%	25,652
Remaining individualsnot grpmax-eligible	0.0016%	62,486
Finnishnot grpmax-eligible	0.00156%	64,028

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: ITPR3
Protein: p.Arg982Cys
Coding: c.2944C>T
MANE Select: NM_002224
Type: single nucleotide variant
Location: chr6:33673606 (GRCh38)
Gene constraint: LOEUF 0.67 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 74.04 · 24 PDB
Residue 982: an α-helix

Full ITPR3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

ITPR3 p.Thr1424Met Pathogenic/Likely pathogenic ★★ ⚠ same type
ITPR3 p.Ala1352Thr Uncertain significance ★★ ⚠ same type
ITPR3 p.Arg1085Leu Uncertain significance ★★ ⚠ same type
ITPR3 p.Arg2659Cys Uncertain significance ★★ ⚠ same type
ITPR3 p.Asp1968Val Uncertain significance ★★ ⚠ same type
ITPR3 p.Glu669Asp Uncertain significance ★★ ⚠ same type
ITPR3 p.Gly1008Trp Uncertain significance ★★ ⚠ same type
ITPR3 p.Gly2514Glu Uncertain significance ★★ ⚠ same type

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/itpr3-p-arg982cys (accessed [today's date]).

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