Rotavirus reverse genetics: A tool for understanding virus biology.

Rotaviruses (RVs) are considered to be one of the most common causes of viral gastroenteritis in young children and infants worldwide. Before recent developments, studies on rotavirus biology have suffered from the lack of an effective reverse genetics (RG) system to generate recombinant rotaviruses and study the precise roles of the viral proteins in the context of RV infection. Lately a fully-tractable plasmid-only based RG system for rescuing recombinant rotaviruses has been developed leading to a breakthrough in the RV field. Since then, the reproducibility and improvements of this technology have led to the generation of several recombinant rotaviruses with modifications on different gene segments, which has allowed the manipulation of viral genes to characterise the precise roles of viral proteins during RV replication cycle or to encode exogenous proteins for different purposes. This review will recapitulate the different RG approaches developed so far, highlighting any similarities, differences and limitations of the systems as well as the gene segments involved. The review will further summarise the latest recombinant rotaviruses generated using the plasmid-only based RG system showing the enormous potentials of this technique to shed light on the still unanswered questions in rotavirus biology.