Abstract
Viruses have to meet the challenge to cope with the limited capacity of renewal of neuronal cells in order to allow their replication and persistence in the central nervous system (CNS). Accordingly, many neurotropic viruses establish latency to optimize their maintenance in the CNS. Bornaviruses have evolved a different and original strategy to persist in neurons, which involves an active replication without associated cytopathic effect. Despite their small genomes and limited number of proteins, bornaviruses hijack multiple signaling pathways, leading to escape from immune surveillance or protection of cells against apoptosis. Long term persistence has even led to integration of genome elements within the host cell genome, leading to "fossil bornaviruses" in a wide range of vertebrate species. Hence, bornaviruses represent the ideal host-cell adaptation example and can thus be considered as the "best enemy" for its hosts.
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