Aphid lethal paralysis virus (ALPV; family Dicistroviridae) was first isolated from the bird cherry-oat aphid, Rhopalosiphum padi. ALPV-like virus sequences have been reported from many insects and insect predators. We identified a new isolate of ALPV (ALPV-AP) from the pea aphid, Acyrthosiphon pisum, and a new isolate (ALPV-DvV) from western corn rootworm, Diabrotica virgifera virgifera. ALPV-AP has an ssRNA genome of 9940 nt. Based on phylogenetic analysis, ALPV-AP was closely related to ALPV-AM, an ALPV isolate from honeybees, Apis mellifera, in Spain and Brookings, SD, USA. The distinct evolutionary branches suggested the existence of two lineages of the ALPV virus. One consisted of ALPV-AP and ALPV-AM, whilst all other isolates of ALPV grouped into the other lineage. The similarity of ALPV-AP and ALPV-AM was up to 88 % at the RNA level, compared with 78–79 % between ALPV-AP and other ALPV isolates. The sequence identity of proteins between ALPV-AP and ALPV-AM was 98–99 % for both ORF1 and ORF2, whilst only 85–87 % for ORF1 and 91–92 % for ORF2 between ALPV-AP and other ALPV isolates. Sequencing of RACE (rapid amplification of cDNA ends) products and cDNA clones of the virus genome revealed sequence variation in the 5′ UTRs and in ORF1, indicating that ALPV may be under strong selection pressure, which could have important biological implications for ALPV host range and infectivity. Our results indicated that ALPV-like viruses infect insects in the order Coleoptera, in addition to the orders Hemiptera and Hymenoptera, and we propose that ALPV isolates be classified as two separate viral species.
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