Is C2CD4D p.Arg186Ser (c.556C>A) pathogenic?

C2CD4D p.Arg186Ser (c.556C>A) is classified Uncertain significance in C2CD4D (ClinVar, Single submitter, 1 submitter; last evaluated 2024-08-01). AlphaMissense: likely benign (0.1694); Very rare (popmax 0.0075%, afr).

How common is C2CD4D p.Arg186Ser (c.556C>A) in the general population?

C2CD4D p.Arg186Ser (c.556C>A) is very rare (popmax 0.0075%, afr) (gnomAD).

What do computational predictors say about C2CD4D p.Arg186Ser (c.556C>A)?

AlphaMissense predicts likely benign (score 0.1694) — an in-silico prediction, not a clinical call.

C2CD4D p.Arg186Ser

c.556C>A · VCV3483565

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1694 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0075%, afr)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1694	likely benign
REVEL	0.067	moderately benign-leaning
SaProt	LLR -6.52	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 1.3	GERP -2, phastCons 1
Overall
CADD	18.51	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 0.0075% African / African-American · 5/66,704 alleles

Filtering AF 0.00289% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00189%

Overall 0.0012% 17/1,419,564 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.0075%	13,341
Admixed American	0.00598%	16,734
Remaining individualsnot grpmax-eligible	0.00184%	54,274
European (non-Finnish)	0.000826%	121,122

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: C2CD4D
Protein: p.Arg186Ser
Coding: c.556C>A
MANE Select: NM_001394591
Type: single nucleotide variant
Location: chr1:151838434 (GRCh38)
Gene constraint: LOEUF 1.931 · pLI 0.12 (gnomAD)
Structure: AlphaFold pLDDT 66.41
Residue 186: the 'disordered' region

Full C2CD4D gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

C2CD4D p.Ala120Val Uncertain significance ★ ⚠ same type
C2CD4D p.Ala301Gly Uncertain significance ★ ⚠ same type
C2CD4D p.Ala31Ser Uncertain significance ★ ⚠ same type
C2CD4D p.Ala38Pro Uncertain significance ★ ⚠ same type
C2CD4D p.Ala63Glu Uncertain significance ★ ⚠ same type
C2CD4D p.Ala78Thr Uncertain significance ★ ⚠ same type
C2CD4D p.Arg102Trp Uncertain significance ★ ⚠ same type
C2CD4D p.Arg185His 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/c2cd4d-p-arg186ser (accessed [today's date]).

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