Is C2CD3 p.Ser1856Pro (c.5566T>C) pathogenic?

C2CD3 p.Ser1856Pro (c.5566T>C) is classified Uncertain significance in C2CD3 (ClinVar, Single submitter, 1 submitter; last evaluated 2023-07-21). AlphaMissense: likely pathogenic (0.6087); Very rare (popmax 8.48e-05%, nfe).

How common is C2CD3 p.Ser1856Pro (c.5566T>C) in the general population?

C2CD3 p.Ser1856Pro (c.5566T>C) is very rare (popmax 8.48e-05%, nfe) (gnomAD).

What do computational predictors say about C2CD3 p.Ser1856Pro (c.5566T>C)?

AlphaMissense predicts likely pathogenic (score 0.6087) — an in-silico prediction, not a clinical call.

C2CD3 p.Ser1856Pro

c.5566T>C · rs1953094328 · VCV1961875

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely pathogenic

0.6087 · ACMG-weighted

gnomAD v4.1

Rare

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

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.6087	likely pathogenic
REVEL	0.116	moderately benign-leaning
SaProt	LLR -6.80	tolerated
⇒ AlphaMissense calls this damaging; REVEL and SaProt do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 11	GERP 1.8, phastCons 1
Regional constraint	o/e 0.92	unconstrained · MANE · 157 kb · p 9.8e-06 · regional, not allelic
Overall
CADD	26.5	PHRED · no single calibrated threshold — expert panels disagree

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) · 1/1,178,974 alleles

Overall 6.84e-05% 1/1,460,978 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: C2CD3
Protein: p.Ser1856Pro
Coding: c.5566T>C
MANE Select: NM_001286577
dbSNP: rs1953094328
Type: single nucleotide variant
Location: chr11:74042148 (GRCh38)
Gene constraint: LOEUF 0.637 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 55.65

Full C2CD3 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

C2CD3 p.Ser1856Phe Uncertain significance ★ ⚠ same residue
C2CD3 c.3911-2A>T Pathogenic/Likely pathogenic ★★ same type
C2CD3 p.Arg621Ter Pathogenic/Likely pathogenic ★★ same type
C2CD3 p.Arg666Ter Pathogenic ★★ same type
C2CD3 p.Arg768Ter Pathogenic/Likely pathogenic ★★ same type
C2CD3 p.Tyr173Ter Pathogenic/Likely pathogenic ★★ same type
C2CD3 c.2085+5G>A Uncertain significance ★★ same type
C2CD3 c.4951+6C>T 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/c2cd3-p-ser1856pro (accessed [today's date]).

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