Is TP53 p.Pro222fs (c.665del) pathogenic?

TP53 p.Pro222fs (c.665del) is classified Pathogenic in TP53 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2024-02-15). Absent from gnomAD; Associated with Li-Fraumeni syndrome.

What condition is associated with TP53 p.Pro222fs (c.665del)?

TP53 p.Pro222fs (c.665del) is associated with Li-Fraumeni syndrome, ovarian neoplasm (ClinVar).

How common is TP53 p.Pro222fs (c.665del) in the general population?

TP53 p.Pro222fs (c.665del) is absent from gnomAD (gnomAD).

How is Li-Fraumeni syndrome inherited?

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

TP53 p.Pro222fs

c.665del · rs1567551073 · VCV634705

Pathogenic Multiple submitters

Classification

Pathogenic

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

Consequence

frameshift

predicted LoF

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

Li-Fraumeni syndrome

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function in a haploinsufficient gene (ClinGen)
NMD	predicted	premature termination codon in exon 6 of 11
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP -9.6	GERP -4.6

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

dbSNP / gnomAD

No gnomAD frequency available for this variant. 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: TP53
Protein: p.Pro222fs
Coding: c.665del
MANE Select: NM_000546
dbSNP: rs1567551073
Type: Deletion
Location: chr17:7674866 (GRCh38)
Gene constraint: LOEUF 0.449 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 75.83 · 321 PDB
Residue 222: a DNA-binding region; the 'interaction with axin1' region; an α-helix; the 'interaction with ccar2' region; the 'interaction with hipk1' region; the 'required for interaction with znf385a' region; a UniProt-annotated variant site (in a sporadic cancer; somatic mutation); a UniProt-annotated variant site (in sporadic cancers; somatic mutation); the 'required for interaction with fbxo42' 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

Also linked: ovarian neoplasm

For Li-Fraumeni syndrome (Orphanet):

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

Similar variants

TP53 p.Pro222= Benign/Likely benign ★★ same residue
TP53 p.Pro222Gln Uncertain significance ★ ⚠ same residue
TP53 p.Pro222Leu Conflicting classifications of pathogenicity ★ ⚠ same residue
TP53 p.Pro222Ser Conflicting classifications of pathogenicity ★ ⚠ same residue
TP53 c.993+1del Likely pathogenic ★★★ same condition
TP53 p.Ala161_Tyr163delinsAsp Likely pathogenic ★★★ same condition
TP53 p.Arg213fs Pathogenic ★★★ same condition
TP53 p.Leu252_Ile254del 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-pro222fs (accessed [today's date]).

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