Is CCM2 p.Pro77fs (c.228dup) pathogenic?

CCM2 p.Pro77fs (c.228dup) is classified Pathogenic in CCM2 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-04-01). Absent from gnomAD; Associated with cerebral cavernous malformation 2.

What condition is associated with CCM2 p.Pro77fs (c.228dup)?

CCM2 p.Pro77fs (c.228dup) is associated with cerebral cavernous malformation 2 (ClinVar).

How common is CCM2 p.Pro77fs (c.228dup) in the general population?

CCM2 p.Pro77fs (c.228dup) is absent from gnomAD (gnomAD).

CCM2 p.Pro77fs

c.228dup · rs2128747319 · VCV1070815

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

frameshift

predicted LoF

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

cerebral cavernous malformation 2

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function
NMD	predicted	premature termination codon in exon 3 of 10
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 6	GERP 1.6, phastCons 1

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

dbSNP / gnomAD

No gnomAD frequency available for this variant. This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: CCM2
Protein: p.Pro77fs
Coding: c.228dup
MANE Select: NM_031443
dbSNP: rs2128747319
Type: Duplication
Location: chr7:45063940 (GRCh38)
Gene constraint: LOEUF 0.753 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 67.48 · 8 PDB
Residue 77: the pid domain

Full CCM2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

cerebral cavernous malformation 2 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CCM2 p.Arg412fs Pathogenic/Likely pathogenic ★★ same condition
CCM2 p.Glu359delinsProTer Pathogenic ★ same condition
CCM2 p.His104fs Pathogenic ★ same condition
CCM2 p.Trp124fs Pathogenic ★ same condition
CCM2 p.Val67fs Pathogenic ★ same condition
CCM2 c.204+2dup Uncertain significance ★ same condition
OSM p.Arg77Cys Uncertain significance ★ ⚠ same residue
CCM2 c.289-1G>A Pathogenic/Likely pathogenic ★★ 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/ccm2-p-pro77fs (accessed [today's date]).

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