Is TP53 p.Pro27Arg (c.80C>G) pathogenic?

TP53 p.Pro27Arg (c.80C>G) is classified Uncertain significance in TP53 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-04-15). AlphaMissense: likely benign (0.2341); Absent from gnomAD v4.1; Associated with Li-Fraumeni syndrome.

What condition is associated with TP53 p.Pro27Arg (c.80C>G)?

TP53 p.Pro27Arg (c.80C>G) is associated with Li-Fraumeni syndrome (ClinVar).

How common is TP53 p.Pro27Arg (c.80C>G) in the general population?

TP53 p.Pro27Arg (c.80C>G) is absent from gnomAD v4.1 (gnomAD).

How is Li-Fraumeni syndrome inherited?

Typically Autosomal dominant (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about TP53 p.Pro27Arg (c.80C>G)?

AlphaMissense predicts likely benign (score 0.2341) — an in-silico prediction, not a clinical call.

TP53 p.Pro27Arg

c.80C>G · rs1555526933 · VCV664352

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.2341 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Li-Fraumeni syndrome

Computational evidence

Protein change
AlphaMissense	0.2341	likely benign
REVEL	0.673	pathogenic-leaning
SaProt	LLR -8.52	tolerated
⇒ REVEL calls this damaging; AlphaMissense and SaProt do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 2.1	GERP 1.1, phastCons 0.91
Regional constraint	o/e 0.89	unconstrained · MANE · 6,982 bp · p 0.0085 · regional, not allelic
Overall
CADD	22.2	PHRED · no single calibrated threshold — expert panels disagree

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

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: TP53
Protein: p.Pro27Arg
Coding: c.80C>G
MANE Select: NM_000546
dbSNP: rs1555526933
Type: single nucleotide variant
Location: chr17:7676398 (GRCh38)
Gene constraint: LOEUF 0.449 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 75.83 · 321 PDB
Residue 27: an α-helix; the 'interaction with ccar2' region; the 'interaction with hrmt1l2' region; the 'transcription activation (acidic)' region

Full TP53 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

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

For Li-Fraumeni syndrome (Orphanet):

Inheritance: Autosomal dominant
Onset: All ages
Prevalence: 1-9 / 100 000 (United Kingdom)

Similar variants

TP53 p.Pro27Ser Uncertain significance ★★ ⚠ same residue
TP53 p.Pro27= Likely benign ★★ same residue
TP53 p.Pro27Ala Conflicting classifications of pathogenicity ★ ⚠ same residue
TP53 p.Pro27Leu Conflicting classifications of pathogenicity ★ ⚠ same residue
TP53 p.Pro27Thr Conflicting classifications of pathogenicity ★ ⚠ same residue
TP53 p.Pro27fs Pathogenic ★★ same residue
TP53 c.375+5G>A Likely pathogenic ★★★ same condition
TP53 c.919+1G>A 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/tp53-p-pro27arg (accessed [today's date]).

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