Transcriptomic evidence of a fourth mininucleovirus (Mininucleoviridae): A rapidly growing family among the Nucleo-Cytoplasmic Large DNA viruses (NCLDVs).

The Mininucleoviridae are crustacean-infecting viruses thought to drive mortality across aquatic biomes. Three have been characterised from Carcinus maenas, Panulirus argus, and Dikerogammarus haemobaphes. We screened 202 SRA datasets (NCBI) for novel mininucleoviruses from 44 amphipod species. Three metatranscriptome datasets from Gammarus lacustris contained sequences with similarity to Dikerogammarus haemobaphes mininucleovirus. Assembly resulted in 19 transcripts, 16 were putatively polycistronic. The putative Gammarus lacustris mininucleovirus shares 46 homologues with other mininucleoviruses (similarity range: 24.07 - 78.2 %). The transcripts from this putative virus highlight its likely association with the Mininucleoviridae.