Is COMP p.Cys328Trp (c.984C>G) pathogenic?

COMP p.Cys328Trp (c.984C>G) is classified Likely pathogenic in COMP (ClinVar, Single submitter, 1 submitter; last evaluated 2018-11-01). AlphaMissense: likely pathogenic (0.9971); Absent from gnomAD v4.1.

How common is COMP p.Cys328Trp (c.984C>G) in the general population?

COMP p.Cys328Trp (c.984C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about COMP p.Cys328Trp (c.984C>G)?

AlphaMissense predicts likely pathogenic (score 0.9971) — an in-silico prediction, not a clinical call.

COMP p.Cys328Trp

c.984C>G · rs1601055923 · VCV808505

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.9971 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.9971	likely pathogenic ✓ concordant with ClinVar · top 2% in COMP
REVEL	0.808	moderately pathogenic-leaning
SaProt	LLR -15.73	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 2.4	GERP -1.5, phastCons 1
Regional constraint	o/e 0.84	unconstrained · MANE · 8,351 bp · p 2.2e-07 · regional, not allelic
Overall
CADD	25.2	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

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: COMP
Protein: p.Cys328Trp
Coding: c.984C>G
MANE Select: NM_000095
dbSNP: rs1601055923
Type: single nucleotide variant
Location: chr19:18787642 (GRCh38)
Gene constraint: LOEUF 1.073 · pLI <0.01 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 88.60 · 1 PDB
Residue 328: a β-strand; the 'disordered' region; a disulfide bond; a UniProt-annotated variant site (in psach; mild form)

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

Similar variants

COMP p.Cys328Phe Likely pathogenic ★ same residue
COMP p.Cys328Tyr Uncertain significance ★ ⚠ same residue
COMP p.Cys328Arg Pathogenic same residue
COMP p.Arg718Trp Pathogenic/Likely pathogenic ★★ ⚠ same type
COMP p.Asn489Lys Pathogenic/Likely pathogenic ★★ same type
COMP p.Asn523Lys Pathogenic/Likely pathogenic ★★ same type
COMP p.Asn555Lys Pathogenic/Likely pathogenic ★★ same type
COMP p.Asp269Gly Pathogenic/Likely pathogenic ★★ 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/comp-p-cys328trp (accessed [today's date]).

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