Is TP53 p.Thr55= (c.165T>G) pathogenic?

TP53 p.Thr55= (c.165T>G) is classified Likely benign in TP53 (ClinVar, Single submitter, 1 submitter; last evaluated 2019-06-15). Absent from gnomAD v4.1; Associated with Li-Fraumeni syndrome.

What condition is associated with TP53 p.Thr55= (c.165T>G)?

TP53 p.Thr55= (c.165T>G) is associated with Li-Fraumeni syndrome (ClinVar).

How common is TP53 p.Thr55= (c.165T>G) in the general population?

TP53 p.Thr55= (c.165T>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.

TP53 p.Thr55=

c.165T>G · rs2151042543 · VCV1126030

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

Li-Fraumeni 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 -7	GERP -3.5
Overall
CADD	0.795	PHRED · no single calibrated threshold — expert panels disagree

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.Thr55=
Coding: c.165T>G
MANE Select: NM_000546
dbSNP: rs2151042543
Type: single nucleotide variant
Location: chr17:7676204 (GRCh38)
Gene constraint: LOEUF 0.449 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 75.83 · 321 PDB
Residue 55: an α-helix; the 'interaction with ccar2' region; the 'interaction with hrmt1l2' region; a modified residue (phosphothreonine; by taf1 and grk5); the 'disordered' 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.Thr55Pro Uncertain significance ★ ⚠ same residue
TP53 p.Thr55Ser Uncertain significance ★ ⚠ same residue
TP53 c.375+5G>A Likely pathogenic ★★★ same condition
TP53 c.919+1G>A Pathogenic ★★★ same condition
TP53 c.97-1G>A Pathogenic ★★★ same condition
TP53 p.Ala138Pro Likely pathogenic ★★★ same condition
TP53 p.Ala138Val Likely pathogenic ★★★ same condition
TP53 p.Ala347Asp 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-thr55 (accessed [today's date]).

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