Influence de la variabilité des protéines d’enveloppe du virus de l’hépatite B sur l’évolution de l’infection évaluée par la persistance de l’antigène HBs

Abstract : Chronic hepatitis B affects about 257 million people worldwide. The loss of HBS antigen (HBsAg), a marker of the functional cure, is very rarely observed, even on anti-HBV treatment (3-16%). The hepatitis B virus (HBV) envelope proteins (HBsAg) are highly variable and crucial for the viral infectivity and pathogeny. We hypothesized that the HBV variability in the envelope proteins could explain, at least partially, the evolution of HBV infection, evaluated by HBsAg clearance, in patients treated or not by anti-HBV nucleos(t)idic analogues. For 29 patients infected with different HBV genotypes (A, C and D), presenting different clinical profiles (acute or chronic infection, HBV/HIV co-infection) and therapies, a very high variability of HBV envelope proteins was observed. In these patients, the persistence of HBsAg was correlated with the presence of mutations and deletions located in areas that play a key role in the viral recognition by the immune system. These results reinforce the hypothesis that the study of HBV envelope proteins could highlight molecular signatures influencing HBV fitness which would subsequently modify the clinical evolution of HBV-related disease
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Marine Eschlimann. Influence de la variabilité des protéines d’enveloppe du virus de l’hépatite B sur l’évolution de l’infection évaluée par la persistance de l’antigène HBs. Immunologie. Université de Lorraine, 2017. Français. ⟨NNT : 2017LORR0133⟩. ⟨tel-01762403⟩

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