Abstract:
:The Kansas/15626/84 (Ka) and Shipping Fever (SF) strains of bovine parainfluenza virus type 3 (BPIV3) replicate less efficiently than human PIV3 (HPIV3) in the upper and lower respiratory tract of rhesus monkeys, and BPIV3 Ka is also highly attenuated in humans and is in clinical trials as a candidate vaccine against HPIV3. To initiate an investigation of the genetic basis of the observed attenuation phenotype of BPIV3 in primates, the complete genomic sequences of Ka and SF genomes were determined and compared to those of BPIV3 strain 910N and two HPIV3 strains, JS and Wash/47885/57. There is a high degree of identity between the five PIV3 viruses in their 55 nucleotide (nt) leader (83.6%) and 44 nt trailer (93.2%) sequences. The five viruses display amino acid sequence identity ranging from 58.6% for the phosphoprotein to 89.7% for the matrix protein. Interestingly, the majority of amino acid residues found to be variable at a given position in a five-way protein alignment are nonetheless identical within the viruses of either host species (BPIV3 or HPIV3). These host-specific residues might be products of distinct selective pressures on BPIV3 and HPIV3 during evolution in their respective hosts. These host-specific sequences likely include ones which are responsible for the host range differences, such as the efficient growth of BPIV3 in bovines compared to its restricted growth in primates. It should now be possible using the techniques of reverse genetics to import sequences from BPIV3 into HPIV3 and identify those nt or protein sequences which attenuate HPIV3 for primates. This information should be useful in understanding virus-host interactions and in the development of vaccines to protect against HPIV3-induced disease.
journal_name
Virus Genesjournal_title
Virus genesauthors
Bailly JE,McAuliffe JM,Skiadopoulos MH,Collins PL,Murphy BRdoi
10.1023/a:1008130917204subject
Has Abstractpub_date
2000-01-01 00:00:00pages
173-82issue
2eissn
0920-8569issn
1572-994Xjournal_volume
20pub_type
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