Is CDKN1C p.Ala228Pro (c.682G>C) pathogenic?

CDKN1C p.Ala228Pro (c.682G>C) is classified Uncertain significance in CDKN1C (ClinVar, Single submitter, 1 submitter; last evaluated 2020-11-18). AlphaMissense: likely benign (0.1449); Absent from gnomAD v4.1; Associated with Beckwith-Wiedemann syndrome.

What condition is associated with CDKN1C p.Ala228Pro (c.682G>C)?

CDKN1C p.Ala228Pro (c.682G>C) is associated with Beckwith-Wiedemann syndrome (ClinVar).

How common is CDKN1C p.Ala228Pro (c.682G>C) in the general population?

CDKN1C p.Ala228Pro (c.682G>C) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CDKN1C p.Ala228Pro (c.682G>C)?

AlphaMissense predicts likely benign (score 0.1449) — an in-silico prediction, not a clinical call.

CDKN1C p.Ala228Pro

c.682G>C · rs781428134 · VCV1466538

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1449 · ACMG-weighted

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,503,814)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Beckwith-Wiedemann syndrome

Computational evidence

Protein change
AlphaMissense	0.1449	likely benign
REVEL	0.074	moderately benign-leaning
SaProt	LLR -5.97	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 3.5	GERP 0.54, phastCons 0.1
Overall
CADD	21.1	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.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM A239P vs ClinVar A228P) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 1,503,814). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: CDKN1C
Protein: p.Ala228Pro
Coding: c.682G>C
MANE Select: NM_001122630
dbSNP: rs781428134
Type: single nucleotide variant
Location: chr11:2884775 (GRCh38)
Gene constraint: LOEUF 1.943 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 63.93
Residue 228: the 'disordered' region

Full CDKN1C gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Beckwith-Wiedemann syndrome — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

CDKN1C p.Ala228Ser Uncertain significance ★ ⚠ same residue
CDKN1C p.Ala228= Likely benign ★ same residue
CDKN1C p.Asp263Asn Pathogenic ★★ ⚠ same condition
CDKN1C p.Cys19Ter Pathogenic/Likely pathogenic ★★ same condition
CDKN1C p.Gln219Ter Pathogenic ★★ same condition
CDKN1C p.Gln221Ter Pathogenic ★★ same condition
CDKN1C p.Gln230Ter Pathogenic ★★ same condition
CDKN1C p.Glu119Ter Pathogenic ★★ same condition

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/cdkn1c-p-ala228pro (accessed [today's date]).

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