Abstract :
[en] Human T-cell leukemia virus type 1 (HTLV-1) is a retrovirus that causes
cancer (Adult T cell Leukemia, ATL) and a spectrum of inflammatory diseases (mainly
HTLV-associated myelopathy—tropical spastic paraparesis, HAM/TSP). Since virions are
particularly unstable, HTLV-1 transmission primarily occurs by transfer of a cell carrying
an integrated provirus. After transcription, the viral genomic RNA undergoes reverse
transcription and integration into the chromosomal DNA of a cell from the newly infected
host. The virus then replicates by either one of two modes: (i) an infectious cycle by virus
budding and infection of new targets and (ii) mitotic division of cells harboring an integrated
provirus. HTLV-1 replication initiates a series of mechanisms in the host including antiviral
immunity and checkpoint control of cell proliferation. HTLV-1 has elaborated strategies to
counteract these defense mechanisms allowing continuous persistence in humans.
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