Is C2CD2 p.Thr425Ala (c.1273A>G) pathogenic?

C2CD2 p.Thr425Ala (c.1273A>G) is classified Uncertain significance in C2CD2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-09). AlphaMissense: likely benign (0.1191); Very rare (popmax 0.0028%, nfe).

How common is C2CD2 p.Thr425Ala (c.1273A>G) in the general population?

C2CD2 p.Thr425Ala (c.1273A>G) is very rare (popmax 0.0028%, nfe) (gnomAD).

What do computational predictors say about C2CD2 p.Thr425Ala (c.1273A>G)?

AlphaMissense predicts likely benign (score 0.1191) — an in-silico prediction, not a clinical call.

C2CD2 p.Thr425Ala

c.1273A>G · VCV4647220

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1191 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.0028%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.1191	likely benign
REVEL	0.073	moderately benign-leaning
SaProt	LLR -6.14	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Pangolin	Δ0.20	loss · gain 0.00 · not in the SpliceAI release · independent
Constraint at this position
Conservation	phyloP 5.9	GERP 2.1, phastCons 1
Regional constraint	o/e 0.87	unconstrained · MANE · 65 kb · p 0.00014 · regional, not allelic
Overall
CADD	18.62	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 0.0028% European (non-Finnish) · 33/1,180,014 alleles

Filtering AF 0.00199% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00175%

Overall 0.00279% 45/1,614,032 alleles · very rare

Ancestry group	Frequency	1 in
Amishnot grpmax-eligible	1.21%	83
European (non-Finnish)grpmax	0.0028%	35,758
Finnishnot grpmax-eligible	0.00156%	64,046

Amish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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.Thr425Ala
Coding: c.1273A>G
MANE Select: NM_015500
Type: single nucleotide variant
Location: chr21:41907037 (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-thr425ala (accessed [today's date]).

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