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GFI1's role in DNA repair suggests implications for tumour cell response to treatment
Charles Vadnais1, Tarik Möröy1,2,3
1Institut de recherches cliniques de Montréal (IRCM), Montréal, QC, Canada.
Abstract:
Despite recent advances in cancer treatment through personalized and precision medicine and new avenues such as immunotherapy and chimeric antibodies, the induction of DNA damage either through irradiation or specific compounds remains the primary approach to kill tumour cells. Improvements in our understanding of how tumour cells respond to DNA damage, and especially how this response differs from that of normal cells, are crucial to the development of better and more efficient therapies. We have recently shown that the activity of the oncogenic transcription factor GFI1, which is required for the development and maintenance of T and B cell leukemia, increases the ability of tumour cells to repair their DNA following damage (Vadnais et al. Nat Commun 9(1):1418). GFI1 accomplishes this by regulating the post-translational modifications (PTM) of key DNA repair proteins, including MRE11 and 53BP1, by the methyltransferase PRMT1. Here, GFI1 acts as an accessory protein required for the interaction between the enzyme and its substrates. This has implications for the treatment response of tumour cells overexpressing GFI1, which includes T cell leukemia, neuroendocrine lung carcinomas and aggressive subtypes of medulloblastoma, and suggests that targeting GFI1's activity and with this its capacity to aid DNA repair may open avenues for new therapeutic approaches.
Insights
The oncogenic transcription factor GFI1 helps tumor cells repair DNA damage, hindering cancer treatments. Targeting GFI1
Area of Science:
- Oncology
- Molecular Biology
- Cancer Genetics
Background:
- DNA damage induction via irradiation or compounds is a primary cancer treatment strategy.
- Understanding tumor cell DNA damage response is crucial for developing effective therapies.
- The oncogenic transcription factor GFI1 is vital for T and B cell leukemia development.
Purpose of the Study:
- To investigate the role of GFI1 in tumor cell DNA damage repair.
- To elucidate the mechanism by which GFI1 influences DNA repair pathways.
- To explore therapeutic strategies targeting GFI1 in specific cancers.
Main Methods:
- Investigated the interaction between GFI1, PRMT1, and DNA repair proteins MRE11 and 53BP1.
- Analyzed the effect of GFI1 on post-translational modifications (PTMs) of DNA repair proteins.
- Examined the impact of GFI1 activity on tumor cell survival following DNA damage.
Main Results:
- GFI1 enhances tumor cell DNA repair capacity by regulating PRMT1-mediated PTMs of MRE11 and 53BP1.
- GFI1 acts as an accessory protein facilitating the interaction between PRMT1 and its substrates.
- Tumor cells overexpressing GFI1 exhibit increased resistance to DNA damaging agents.
Conclusions:
- GFI1 plays a significant role in promoting DNA repair in cancer cells.
- Targeting GFI1's function in DNA repair may represent a novel therapeutic approach.
- Cancers such as T cell leukemia, neuroendocrine lung carcinomas, and medulloblastoma could potentially benefit from GFI1-targeted therapies.