Is C2CD2 p.Pro691Ser (c.2071C>T) pathogenic?

C2CD2 p.Pro691Ser (c.2071C>T) is classified Uncertain significance in C2CD2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-07-16). AlphaMissense: likely benign (0.0821); Very rare (popmax 0.000763%, nfe).

How common is C2CD2 p.Pro691Ser (c.2071C>T) in the general population?

C2CD2 p.Pro691Ser (c.2071C>T) is very rare (popmax 0.000763%, nfe) (gnomAD).

What do computational predictors say about C2CD2 p.Pro691Ser (c.2071C>T)?

AlphaMissense predicts likely benign (score 0.0821) — an in-silico prediction, not a clinical call.

C2CD2 p.Pro691Ser

c.2071C>T · VCV4217211

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0821 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.000763%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.0821	likely benign
REVEL	0.065	moderately benign-leaning
SaProt	LLR -6.05	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 2	GERP 0.93, phastCons 0.98
Regional constraint	o/e 0.87	unconstrained · MANE · 65 kb · p 0.00014 · regional, not allelic
Overall
CADD	3.366	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 0.000763% European (non-Finnish) · 9/1,179,952 alleles

Filtering AF 0.000359% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00026%

Overall 0.000616% 9/1,459,964 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: C2CD2
Protein: p.Pro691Ser
Coding: c.2071C>T
MANE Select: NM_015500
Type: single nucleotide variant
Location: chr21:41889144 (GRCh38)
Gene constraint: LOEUF 0.924 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 62.52

Full C2CD2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

C2CD2 p.Pro104= Benign ★★ same type
C2CD2 p.Ala123Val Uncertain significance ★ ⚠ same type
C2CD2 p.Ala136Gly Uncertain significance ★ ⚠ same type
C2CD2 p.Ala146Val Uncertain significance ★ ⚠ same type
C2CD2 p.Ala189Thr Uncertain significance ★ ⚠ same type
C2CD2 p.Ala207Val Uncertain significance ★ ⚠ same type
C2CD2 p.Ala345Val Uncertain significance ★ ⚠ same type
C2CD2 p.Ala466Thr 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/c2cd2-p-pro691ser (accessed [today's date]).

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