Is C2CD4B p.Pro226Arg (c.677C>G) pathogenic?

C2CD4B p.Pro226Arg (c.677C>G) is classified Uncertain significance in C2CD4B (ClinVar, Single submitter, 1 submitter; last evaluated 2023-12-26). AlphaMissense: likely benign (0.092); Very rare (popmax 0.00302%, afr).

How common is C2CD4B p.Pro226Arg (c.677C>G) in the general population?

C2CD4B p.Pro226Arg (c.677C>G) is very rare (popmax 0.00302%, afr) (gnomAD).

What do computational predictors say about C2CD4B p.Pro226Arg (c.677C>G)?

AlphaMissense predicts likely benign (score 0.092) — an in-silico prediction, not a clinical call.

C2CD4B p.Pro226Arg

c.677C>G · rs1211563598 · VCV3135894

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.092 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00302%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.092	likely benign
REVEL	0.025	moderately benign-leaning
SaProt	LLR -6.73	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 -0.14	GERP 1.1
Regional constraint	o/e 1.11	unconstrained · MANE · 1,091 bp · p 0.0058 · regional, not allelic
Overall
CADD	17.84	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 0.00302% African / African-American · 2/66,294 alleles

Filtering AF 0.000501% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000187%

Overall 0.000142% 2/1,409,874 alleles · very rare exomes 0/1,257,986 · genomes 2/151,888 · joint denominator

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: C2CD4B
Protein: p.Pro226Arg
Coding: c.677C>G
MANE Select: NM_001007595
dbSNP: rs1211563598
Type: single nucleotide variant
Location: chr15:62164308 (GRCh38)
Structure: AlphaFold pLDDT 60.81
Residue 226: the 'disordered' region

Full C2CD4B gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

C2CD4B p.Ala138Thr Uncertain significance ★ ⚠ same type
C2CD4B p.Ala190Gly Uncertain significance ★ ⚠ same type
C2CD4B p.Ala197Val Uncertain significance ★ ⚠ same type
C2CD4B p.Ala20Asp Uncertain significance ★ ⚠ same type
C2CD4B p.Ala231Pro Uncertain significance ★ ⚠ same type
C2CD4B p.Ala239Val Uncertain significance ★ ⚠ same type
C2CD4B p.Ala244Thr Uncertain significance ★ ⚠ same type
C2CD4B p.Ala244Val 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/c2cd4b-p-pro226arg (accessed [today's date]).

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