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Chebly A, Ropio J, Peloponese JM, Poglio S, Prochazkova-Carlotti M, Cherrier F, Ferrer J, Idrissi Y, Segal-Bendirdjian E, Chouery E, Farra C, Pham-Ledard A, Beylot-Barry M, Philippe Merlio J, Tomb R, Chevret E. Exploring hTERT promoter methylation in cutaneous T-cell lymphomas. Mol Oncol 2021; 16:1931-1946. [PMID: 33715271 PMCID: PMC9067155 DOI: 10.1002/1878-0261.12946] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 02/28/2021] [Accepted: 03/12/2021] [Indexed: 11/11/2022] Open
Abstract
Cutaneous T‐cell lymphomas (CTCLs) are telomerase‐positive tumors expressing hTERT, although neither gene rearrangement/amplification nor promoter hotspot mutations could explain the hTERT re‐expression. As the hTERT promoter is rich in CpG, we investigated the contribution of epigenetic mechanisms in its re‐expression. We analyzed hTERT promoter methylation status in CTCL cells compared with healthy cells. Gene‐specific methylation analyses revealed a common methylation pattern exclusively in tumor cells. This methylation pattern encompassed a hypermethylated distal region from −650 to −150 bp and a hypomethylated proximal region from −150 to +150 bp. Interestingly, the hypermethylated region matches with the recently named TERT hypermethylated oncogenic region (THOR). THOR has been associated with telomerase reactivation in many cancers, but it has so far not been reported in cutaneous lymphomas. Additionally, we assessed the effect of THOR on two histone deacetylase inhibitors (HDACi), romidepsin and vorinostat, both approved for CTCL treatment and a DNA methyltransferase inhibitor (DNMTi) 5‐azacytidine, unapproved for CTCL. Contrary to our expectations, the findings reported herein revealed that THOR methylation is relatively stable under these epigenetic drugs' pressure, whereas these drugs reduced the hTERT gene expression.
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Affiliation(s)
- Alain Chebly
- Univ. Bordeaux, INSERM, BaRITOn, U1053, F-33000, Bordeaux, France.,Saint Joseph University, Faculty of Medicine, Medical Genetics Unit (UGM), Beirut, Lebanon
| | - Joana Ropio
- Univ. Bordeaux, INSERM, BaRITOn, U1053, F-33000, Bordeaux, France.,Porto University, Institute of Biomedical Sciences of Abel Salazar, Instituto de Investigação e Inovação em Saúde, Institute of Molecular Pathology and Immunology (Ipatimup), Cancer Biology group, 4200-465, Porto, Portugal
| | - Jean-Marie Peloponese
- University of Montpellier, CNRS, IRIM-UMR 9004, Research Institute in Infectiology of Montpellier, Montpellier, France
| | - Sandrine Poglio
- Univ. Bordeaux, INSERM, BaRITOn, U1053, F-33000, Bordeaux, France
| | | | | | - Jacky Ferrer
- Univ. Bordeaux, INSERM, BaRITOn, U1053, F-33000, Bordeaux, France
| | - Yamina Idrissi
- Univ. Bordeaux, INSERM, BaRITOn, U1053, F-33000, Bordeaux, France
| | - Evelyne Segal-Bendirdjian
- INSERM, UMR-S 1124, Team: Cellular Homeostasis Cancer and Therapies, Université de Paris, Paris, France
| | - Eliane Chouery
- Saint Joseph University, Faculty of Medicine, Medical Genetics Unit (UGM), Beirut, Lebanon.,Department of Human Genetics, Gilbert and Rose-Marie Chagoury School of Medicine, Lebanese American University, Byblos, Lebanon
| | - Chantal Farra
- Saint Joseph University, Faculty of Medicine, Medical Genetics Unit (UGM), Beirut, Lebanon.,Hotel Dieu de France Medical Center, Faculty of Medicine, Genetics Department, Beirut, Lebanon
| | - Anne Pham-Ledard
- Univ. Bordeaux, INSERM, BaRITOn, U1053, F-33000, Bordeaux, France.,Bordeaux University Hospital Center, Dermatology Department, F-33000, Bordeaux, France
| | - Marie Beylot-Barry
- Univ. Bordeaux, INSERM, BaRITOn, U1053, F-33000, Bordeaux, France.,Bordeaux University Hospital Center, Dermatology Department, F-33000, Bordeaux, France
| | - Jean Philippe Merlio
- Univ. Bordeaux, INSERM, BaRITOn, U1053, F-33000, Bordeaux, France.,Bordeaux University Hospital Center, Tumor Bank and Tumor Biology Laboratory, F-33600, Pessac, France
| | - Roland Tomb
- Saint Joseph University, Faculty of Medicine, Medical Genetics Unit (UGM), Beirut, Lebanon.,Saint Joseph University, Faculty of Medicine, Dermatology Department, Beirut, Lebanon
| | - Edith Chevret
- Univ. Bordeaux, INSERM, BaRITOn, U1053, F-33000, Bordeaux, France
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