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Genre/Form: | Thèses et écrits académiques |
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Material Type: | Document, Thesis/dissertation |
Document Type: | Computer File |
All Authors / Contributors: |
Doriane Gouas; Pierre Hainaut, biologiste).; Jean-Yves Scoazec, (meÌdecin).; Christine Perret; Jean-Christophe Marine; Isabelle Chemin, auteur d'une theÌse de meÌdecine).; Christine Neuveut, biologiste).; Université Claude Bernard (Lyon).; École Doctorale de Biologie Moléculaire Intégrative et Cellulaire (Lyon).; Centre de Recherche en Cancérologie de Lyon. |
OCLC Number: | 928391423 |
Notes: | Titre provenant de l'écran-titre. |
Description: | 1 online resource |
Responsibility: | Doriane Gouas ; sous la direction de Pierre Hainaut. |
Abstract:
R249S mutation (mutant p.R249S) of TP53 gene, characteristic of the exposure to aflatoxin B1, is the most frequent TP53 mutation in hepatocellular carcinoma (HCC) and is highly associated with chronic hepatitis B virus infection (HBV). Indeed, a synergistic effect exists between these two main risk factors, thus increasing the risk to develop HCC. In a first part, we have studied the molecular mechanisms of this synergy in different cellular models and then, in a second part we have used an epidemiology-based approach to investigate the interaction between the R249S mutation and HBV. Firstly, we have shown that p.R249S has lost p53wt functions. Moreover, p.R249S formed a protein complex with the oncoprotein HBx from HBV in the HCC cell line PLC/PRF/5. In the second part, our results show that R249S mutation is detectable in plasma DNA of asymptomatic subjects from the rural Gambia (West Africa). Our work shows quantitative variations of R249S mutation that are dependent on the levels of exposition to AFB1 but also on the presence of HBV, suggesting an interaction between AFB1 and HBV. Finally, in another study performed in The Gambia and based on subjects with HCC or not (controls), our results show that R249S mutation is highly associated with HBX complete gene in HCC. Therefore this association could explain in part the synergistic effect observed between AFB1 and HBV. Eventually, a critical target may be identified for preventive or early therapeutic interventions on HCC of high-incidence regions.
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