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Developments in the classification and nomenclature of arthropod-infecting large DNA viruses that contain pif genes

ORCID
0000-0002-6664-4445
Affiliation
Wageningen University and Research, Laboratory of Virology, the Netherlands
van Oers, Monique M.;
Affiliation
CNRS - University of Tours, Institut de Recherche sur la Biologie de l’Insecte, UMR 7261, France
Herniou, Elisabeth A.;
GND
17274184X
Affiliation
Julius Kühn-Institute (JKI), Institute for Biological Control, Germany
Jehle, Johannes A.;
Affiliation
University of Guelph, Department of Molecular and Cellular Biology, Canada
Krell, Peter J.;
Affiliation
Joint FAO/IAEA Programme of Nuclear Techniques in Food and Agriculture, Vienna International Centre, Austria
Abd-Alla, Adly M.M.;
Affiliation
University of Brasília, Laboratory of Baculovirus, Cell Biology Department, Brazil
Ribeiro, Bergmann M.;
Affiliation
Agriculture and Agri-Food Canada, Summerland Research and Development Centre, Canada
Theilmann, David A.;
Affiliation
Chinese Academy of Sciences, State Key Laboratory of Virology, Wuhan Institute of Virology, China
Hu, Zhihong;
Affiliation
Invasive Insect Biocontrol and Behavior Laboratory, USDAARS, USA
Harrison, Robert L.

Viruses of four families of arthropod-specific, large dsDNA viruses (the nuclear arthropod large DNA viruses, or NALDVs) possess homologs of genes encoding conserved components involved in the baculovirus primary infection mechanism. The presence of such homologs encoding per os infectivity factors (pif genes), along with their absence from other viruses and the occurrence of other shared characteristics, suggests a common origin for the viruses of these families. Therefore, the class Naldaviricetes was recently established, accommodating these four families. In addition, within this class, the ICTV approved the creation of the order Lefavirales for three of these families, whose members carry homologs of the baculovirus genes that code for components of the viral RNA polymerase, which is responsible for late gene expression. We further established a system for the binomial naming of all virus species in the order Lefavirales, in accordance with a decision by the ICTV in 2019 to move towards a standardized nomenclature for all virus species. The binomial species names for members of the order Lefavirales consist of the name of the genus to which the species belongs (e.g., Alphabaculovirus), followed by a single epithet that refers to the host species from which the virus was originally isolated. The common names of viruses and the abbreviations thereof will not change, as the format of virus names lies outside the remit of the ICTV.

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