Is C2CD4A p.Arg306Pro (c.917G>C) pathogenic?

C2CD4A p.Arg306Pro (c.917G>C) is classified Uncertain significance in C2CD4A (ClinVar, Single submitter, 1 submitter; last evaluated 2025-10-07). AlphaMissense: likely benign (0.1196); Ultra-rare (popmax 0.0584%, sas).

How common is C2CD4A p.Arg306Pro (c.917G>C) in the general population?

C2CD4A p.Arg306Pro (c.917G>C) is ultra-rare (popmax 0.0584%, sas) (gnomAD).

What do computational predictors say about C2CD4A p.Arg306Pro (c.917G>C)?

AlphaMissense predicts likely benign (score 0.1196) — an in-silico prediction, not a clinical call.

C2CD4A p.Arg306Pro

c.917G>C · VCV4647236

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1196 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0584%, sas)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1196	likely benign
REVEL	0.203	benign-leaning
SaProt	LLR -8.51	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 -1	GERP -2.8
Regional constraint	o/e 1.06	unconstrained · MANE · 1,106 bp · p 0.13 · regional, not allelic
Overall
CADD	5.772	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 0.0584% South Asian · 48/82,200 alleles

Filtering AF 0.0452% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0405%

Overall 0.00339% 52/1,533,698 alleles · ultra-rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0584%	1,712
East Asian	0.00259%	38,602
Remaining individualsnot grpmax-eligible	0.00169%	59,300
African / African-American	0.00142%	70,352
European (non-Finnish)	8.76e-05%	1,141,510

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: C2CD4A
Protein: p.Arg306Pro
Coding: c.917G>C
MANE Select: NM_207322
Type: single nucleotide variant
Location: chr15:62068530 (GRCh38)
Gene constraint: LOEUF 1.963 · pLI 0.01 (gnomAD)
Structure: AlphaFold pLDDT 59.36
Residue 306: the c2 domain

Full C2CD4A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

C2CD4A p.Ala102Thr Uncertain significance ★ ⚠ same type
C2CD4A p.Ala160Thr Uncertain significance ★ ⚠ same type
C2CD4A p.Ala192Glu Uncertain significance ★ ⚠ same type
C2CD4A p.Ala226Asp Uncertain significance ★ ⚠ same type
C2CD4A p.Ala318Thr Uncertain significance ★ ⚠ same type
C2CD4A p.Ala318Val Uncertain significance ★ ⚠ same type
C2CD4A p.Ala338Val Uncertain significance ★ ⚠ same type
C2CD4A p.Arg177Gly 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/c2cd4a-p-arg306pro (accessed [today's date]).

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