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Janaththani P, Tevz G, Fernando A, Malik A, Rockstroh A, Kryza T, Walpole C, Moya L, Lehman M, Nelson C, Srinivasan S, Clements J, Batra J. Unravelling the Role of Iroquois Homeobox 4 and its Interplay with Androgen Receptor in Prostate Cancer. RESEARCH SQUARE 2023:rs.3.rs-3295914. [PMID: 38076926 PMCID: PMC10705702 DOI: 10.21203/rs.3.rs-3295914/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/11/2024]
Abstract
Genome-wide association studies have linked Iroquois-Homeobox 4 (IRX4) as a robust expression quantitative-trait locus associated with prostate cancer (PCa) risk. However, the intricate mechanism and regulatory factors governing IRX4 expression in PCa remain poorly understood. Here, we unveil enrichment of androgen-responsive gene signatures in metastatic prostate tumors exhibiting heightened IRX4 expression. Furthermore, we uncover a novel interaction between IRX4 and the androgen receptor (AR) co-factor, FOXA1, suggesting that IRX4 modulates PCa cell behavior through AR cistrome alteration. Remarkably, we identified a distinctive short insertion-deletion polymorphism (INDEL), upstream of the IRX4 gene that differentially regulates IRX4 expression through the disruption of AR binding. This INDEL emerges as the most significant PCa risk-associated variant within the 5p15 locus, in a genetic analysis involving 82,591 PCa cases and 61,213 controls and was associated with PCa survival in patients undergoing androgen-deprivation therapy. These studies suggest the potential of this INDEL as a prognostic biomarker for androgen therapy in PCa and IRX4 as a potential therapeutic target in combination with current clinical management.
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Affiliation(s)
- Panchadsaram Janaththani
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
- Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, Melbourne, Victoria
| | - Gregor Tevz
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
| | - Achala Fernando
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
- Centre for Genomics and Personalised Health, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Adil Malik
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
| | - Anja Rockstroh
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
| | - Thomas Kryza
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
- Mater Research UQ, Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
| | - Carina Walpole
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
- Mater Research UQ, Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
| | - Leire Moya
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
| | - Melanie Lehman
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
- Vancouver Prostate Centre, Department of Urologic Sciences, University of British Columbia, Canada
| | - Colleen Nelson
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
| | - The Australian Prostate Cancer BioResource
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
| | | | - Srilakshmi Srinivasan
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
- Centre for Genomics and Personalised Health, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Judith Clements
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
| | - Jyotsna Batra
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Brisbane, Queensland, Australia
- Translational Research Institute, Woolloongabba, Brisbane, Queensland, Australia
- Centre for Genomics and Personalised Health, Queensland University of Technology, Brisbane, Queensland, Australia
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