Disruption of the TP53 locus in osteosarcoma leads to TP53 promoter gene fusions and restoration of parts of the TP53 signalling pathway

Karim H. Saba, Valeria Difilippo, Michal Kovac, Louise Cornmark, Linda Magnusson, Jenny Nilsson, Hilda van den Bos, Diana C.J. Spierings, Mahtab Bidgoli, Tord Jonson, Vaiyapuri P. Sumathi, Otte Brosjö, Johan Staaf, Floris Foijer, Emelie Styring, Michaela Nathrath, Daniel Baumhoer, Karolin H. Nord

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

TP53 is the most frequently mutated gene in human cancer. This gene shows not only loss-of-function mutations but also recurrent missense mutations with gain-of-function activity. We have studied the primary bone malignancy osteosarcoma, which harbours one of the most rearranged genomes of all cancers. This is odd since it primarily affects children and adolescents who have not lived the long life thought necessary to accumulate massive numbers of mutations. In osteosarcoma, TP53 is often disrupted by structural variants. Here, we show through combined whole-genome and transcriptome analyses of 148 osteosarcomas that TP53 structural variants commonly result in loss of coding parts of the gene while simultaneously preserving and relocating the promoter region. The transferred TP53 promoter region is fused to genes previously implicated in cancer development. Paradoxically, these erroneously upregulated genes are significantly associated with the TP53 signalling pathway itself. This suggests that while the classical tumour suppressor activities of TP53 are lost, certain parts of the TP53 signalling pathway that are necessary for cancer cell survival and proliferation are retained. In line with this, our data suggest that transposition of the TP53 promoter is an early event that allows for a new normal state of genome-wide rearrangements in osteosarcoma.

Original languageEnglish
Pages (from-to)147-160
Number of pages14
JournalJournal of Pathology
Volume262
Issue number2
DOIs
StatePublished - Feb 2024
Externally publishedYes

Keywords

  • TP53 intron 1
  • TP53 mutation
  • TP53 promoter
  • TP53 signalling pathway
  • gene fusion
  • osteosarcoma
  • p53
  • promoter swapping
  • separation-of-function mutation

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