Is CBX2 p.Pro303Ser (c.907C>T) pathogenic?

CBX2 p.Pro303Ser (c.907C>T) is classified Uncertain significance in CBX2 (ClinVar, Single submitter, 1 submitter; last evaluated 2024-05-23). AlphaMissense: likely benign (0.0605); Very rare (popmax 8.48e-05%, nfe).

How common is CBX2 p.Pro303Ser (c.907C>T) in the general population?

CBX2 p.Pro303Ser (c.907C>T) is very rare (popmax 8.48e-05%, nfe) (gnomAD).

What do computational predictors say about CBX2 p.Pro303Ser (c.907C>T)?

AlphaMissense predicts likely benign (score 0.0605) — an in-silico prediction, not a clinical call.

CBX2 p.Pro303Ser

c.907C>T · VCV3263672

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0605 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.48e-05%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0605	likely benign
REVEL	0.024	moderately benign-leaning
SaProt	LLR -5.57	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.54	GERP -0.75
Regional constraint	o/e 1.08	unconstrained · MANE · 5,618 bp · p 0.049 · regional, not allelic
Overall
CADD	6.192	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

Grpmax group 8.48e-05% European (non-Finnish) · 1/1,179,908 alleles

Overall 6.85e-05% 1/1,460,862 alleles · very rare

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: CBX2
Protein: p.Pro303Ser
Coding: c.907C>T
MANE Select: NM_005189
Type: single nucleotide variant
Location: chr17:79784350 (GRCh38)
Gene constraint: LOEUF 0.946 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 57.29 · 3 PDB
Residue 303: the 'disordered' region

Full CBX2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CBX2 p.Pro303Leu Uncertain significance ★ ⚠ same residue
CBX2 c.288+52G>T Uncertain significance ★★ same type
CBX2 p.Arg137His Uncertain significance ★★ ⚠ same type
CBX2 p.Gln349His Uncertain significance ★★ ⚠ same type
CBX2 p.Gly133Ser Uncertain significance ★★ ⚠ same type
CBX2 p.Gly287Arg Uncertain significance ★★ ⚠ same type
CBX2 p.Gly332Asp Uncertain significance ★★ ⚠ same type
CBX2 p.Met260Val 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/cbx2-p-pro303ser (accessed [today's date]).

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