Is CDKN1C p.Ser276Trp (c.827C>G) pathogenic?

CDKN1C p.Ser276Trp (c.827C>G) is classified Uncertain significance in CDKN1C (ClinVar, Single submitter, 1 submitter; last evaluated 2021-03-23). AlphaMissense: ambiguous (0.5134); Absent from gnomAD v4.1; Associated with Beckwith-Wiedemann syndrome.

What condition is associated with CDKN1C p.Ser276Trp (c.827C>G)?

CDKN1C p.Ser276Trp (c.827C>G) is associated with Beckwith-Wiedemann syndrome (ClinVar).

How common is CDKN1C p.Ser276Trp (c.827C>G) in the general population?

CDKN1C p.Ser276Trp (c.827C>G) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CDKN1C p.Ser276Trp (c.827C>G)?

AlphaMissense predicts ambiguous (score 0.5134) — an in-silico prediction, not a clinical call.

CDKN1C p.Ser276Trp

c.827C>G · rs928007699 · VCV570919

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.5134 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/2 damaging

REVEL, SaProt · AlphaMissense no call

Conditions

Beckwith-Wiedemann syndrome

Computational evidence

Protein change
AlphaMissense	0.5134	ambiguous
REVEL	0.179	moderately benign-leaning
SaProt	LLR -10.38	damaging
⇒ SaProt calls this damaging; REVEL does not; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.2	GERP -1.5, phastCons 1
Overall
CADD	21.7	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

⚠ Isoform check: AlphaMissense numbered on a different transcript (AM S287W vs ClinVar S276W) — verify the residue.

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: CDKN1C
Protein: p.Ser276Trp
Coding: c.827C>G
MANE Select: NM_001122630
dbSNP: rs928007699
Type: single nucleotide variant
Location: chr11:2884095 (GRCh38)
Gene constraint: LOEUF 1.943 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 63.93
Residue 276: a UniProt-annotated variant site (in image; pcna binding is disrupted); a UniProt-annotated variant site (in image)

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.Ser276Leu Uncertain significance ★★ ⚠ same residue
CDKN1C p.Ser276= 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-ser276trp (accessed [today's date]).

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