Ribonucleoprotein transport in Negative Strand RNA viruses.

Negative-sense, single-stranded RNA (-ssRNA) viruses comprise some of the deadliest human pathogens (Ebola, rabies, influenza A viruses etc.). Developing therapeutic tools relies on a better understanding of their multiplication cycle. For these viruses, the genome replication and transcription activities most-often segregate in membrane-less environments called inclusion bodies (IBs) or viral factories. These "organelles" usually locate far from the cell surface from where new virions are released, and -ssRNA viruses do not encode for transport factors. The efficient trafficking of the genome progeny toward the cell surface is most often ensured by mechanisms co-opting the cellular machineries. In this review, for each -ssRNA viral family, we cover the methods employed to characterize these host-virus interactions, the strategies used by the viruses to promote the virus genome transport, and the current gaps in the literature. Finally, we highlight how Rab11 has emerged as a target of choice for the intracellular transport of -ssRNA virus genomes.