# PTTG1

Source: https://onco.cc/targets/pttg1/  
OnCo record `pttg1` (Target). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

PTTG1 (Securin) is a gene. The public catalogues list it as a biomarker and a DNA repair gene, and clinical evidence ties its variants to diagnosis, prognosis or drug response. Tied to Meningioma.

## Summary

Regulatory protein, which plays a central role in chromosome stability, in the p53/TP53 pathway, and DNA repair. Probably acts by blocking the action of key proteins. During the mitosis, it blocks Separase/ESPL1 function, preventing the proteolysis of the cohesin complex and the subsequent segregation of the chromosomes.

CIViC holds 1 clinical evidence item and 0 assertions across 1 variant.

## Fields

- Kind: Target
- Last checked: 2026-09-23
- Also known as: PTTG1 regulator of sister chromatid separation, securin; Securin; HPTTG; EAP1; securin; ECRAR; TUTR1
- Tags: cancer-genes-wave
- Symbol: PTTG1
- Class: other
- Biology: Regulatory protein, which plays a central role in chromosome stability, in the p53/TP53 pathway, and DNA repair. Probably acts by blocking the action of key proteins. During the mitosis, it blocks Separase/ESPL1 function, preventing the proteolysis of the cohesin complex and the subsequent segregation of the chromosomes. At the onset of anaphase, it is ubiquitinated, conducting to its destruction and to the liberation of ESPL1. Its function is however not limited to a blocking activity, since it is required to activate ESPL1. Negatively regulates the transcriptional activity and related apoptosis activity of TP53. Location: Cytoplasm; Nucleus (UniProt). Locus 5q33.3 (HGNC).
- Where found: Meningioma: CIViC evidence names this disease

## Notes

- Written by scripts/fetch-cancer-genes.ts from CIViC, Open Targets, IntOGen, HGNC and UniProt; the function text is UniProt's, condensed and in UK spelling. Roles: CIViC holds 1 clinical evidence items on its variants; UniProt keyword "DNA repair". Evidence tier "clinical-evidence" is the strongest of those signals.
- Prevalence not recorded: none of the sources gives a positivity rate.

## Sources

- HGNC HGNC:9690: https://www.genenames.org/data/gene-symbol-report/#!/hgnc_id/HGNC:9690
- UniProt O95997: https://www.uniprot.org/uniprotkb/O95997/entry
- NCBI Gene 9232: https://www.ncbi.nlm.nih.gov/gene/9232
- Ensembl ENSG00000164611: https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000164611

## Connected records

- collections: [CIViC](https://onco.cc/collections/civic/)
- cancers: [Meningioma](https://onco.cc/cancers/meningioma/)

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JSON: https://onco.cc/api/v1/entities/pttg1.json