Is COL9A2 p.Arg640Pro (c.1919G>C) pathogenic?

COL9A2 p.Arg640Pro (c.1919G>C) is classified Uncertain significance in COL9A2 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-09-10). AlphaMissense: likely benign (0.1554); Absent from gnomAD v4.1.

How common is COL9A2 p.Arg640Pro (c.1919G>C) in the general population?

COL9A2 p.Arg640Pro (c.1919G>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about COL9A2 p.Arg640Pro (c.1919G>C)?

AlphaMissense predicts likely benign (score 0.1554) — an in-silico prediction, not a clinical call.

COL9A2 p.Arg640Pro

c.1919G>C · rs930549037 · VCV2757514

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1554 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Computational evidence

Protein change
AlphaMissense	0.1554	likely benign
REVEL	0.564	indeterminate
SaProt	LLR -3.18	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.7	GERP 2.1, phastCons 1
Regional constraint	o/e 0.92	unconstrained · MANE · 16 kb · p 0.018 · regional, not allelic
Overall
CADD	25.7	PHRED · no single calibrated threshold — expert panels disagree

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

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: COL9A2
Protein: p.Arg640Pro
Coding: c.1919G>C
MANE Select: NM_001852
dbSNP: rs930549037
Type: single nucleotide variant
Location: chr1:40301333 (GRCh38)
Gene constraint: LOEUF 0.817 · pLI <0.01 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 54.99 · 4 PDB
Residue 640: the 'triple-helical region 1 (col1)' region; a UniProt-annotated variant site (sequence variant); the 'disordered' region

Full COL9A2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

COL9A2 p.Arg640Gln Uncertain significance ★★ ⚠ same residue
COL9A2 p.Arg640Ter Uncertain significance ★★ same residue
COL9A2 c.186+1G>A Pathogenic/Likely pathogenic ★★ same type
COL9A2 p.Arg136Ter Pathogenic/Likely pathogenic ★★ same type
COL9A2 p.Arg504Ter Pathogenic/Likely pathogenic ★★ same type
COL9A2 c.1107+4A>G Uncertain significance ★★ same type
COL9A2 c.1792+5G>A Uncertain significance ★★ same type
COL9A2 c.1793-9T>A 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/col9a2-p-arg640pro (accessed [today's date]).

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