Is CDKN1C p.Pro177= (c.531G>A) pathogenic?

CDKN1C p.Pro177= (c.531G>A) is classified Uncertain significance in CDKN1C (ClinVar, Single submitter, 1 submitter; last evaluated 2024-02-22). Very rare (popmax 0.000541%, nfe); Associated with Beckwith-Wiedemann syndrome.

What condition is associated with CDKN1C p.Pro177= (c.531G>A)?

CDKN1C p.Pro177= (c.531G>A) is associated with Beckwith-Wiedemann syndrome, IMAGe syndrome (ClinVar).

How common is CDKN1C p.Pro177= (c.531G>A) in the general population?

CDKN1C p.Pro177= (c.531G>A) is very rare (popmax 0.000541%, nfe) (gnomAD).

CDKN1C p.Pro177=

c.531G>A · VCV3599531

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.000541%, nfe)

Conditions

Beckwith-Wiedemann syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.83	GERP -0.74
Overall
CADD	7.418	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.000541% European (non-Finnish) · 4/739,722 alleles

Filtering AF 0.000127% ClinGen BA1/BS1 input FAF95, joint · FAF99 8.5e-05%

Overall 0.000522% 4/766,140 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: CDKN1C
Protein: p.Pro177=
Coding: c.531G>A
MANE Select: NM_001122630
Type: single nucleotide variant
Location: chr11:2884926 (GRCh38)
Gene constraint: LOEUF 1.943 · pLI <0.01 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 63.93
Residue 177: the '9 x 4 aa repeats of p-a-p-a' 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

Also linked: IMAGe syndrome

Similar variants

CDKN1C p.Pro177Ala Uncertain significance ★ ⚠ same residue
CDKN1C p.Pro177Leu Uncertain significance ★ ⚠ same residue
CDKN1C p.Pro177Ser Uncertain significance ★ ⚠ same residue
CDKN1C p.Pro177Thr Uncertain significance ★ ⚠ same residue
CDKN1C p.Pro177_Ala178insValAlaAlaProValAlaAlaProValAlaValAlaValLeuAlaProAlaProAlaProAlaProAlaPro Likely benign ★ same residue
CDKN1C p.Pro177fs Likely benign ★ same residue
CDKN1C p.Arg268Ser Likely pathogenic ★★ ⚠ same condition
CDKN1C p.Asp263Asn 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-pro177 (accessed [today's date]).

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