PMID: 7941699Jul 1, 1994Paper

Analysis of capsid protein gene variation among divergent isolates of feline calicivirus

Virus Research
B S Seal


Genomic variability within the capsid protein gene of feline calicivirus (FCV) was evaluated among different isolates using hybridization analysis and enzymatic viral nucleic acid amplification. Total infected cell RNA was first hybridized with cDNA clones generated to the capsid gene of the FCV isolates CFI/68, 255, LLK, NADC and KCD. Field isolates of FCV were categorized by hybridization with capsid gene cDNA from the reference strains. Isolates that did not hybridize were positive by Western blot using a cross-reactive cat polyclonal FCV CFI/68 capsid protein antiserum. Using previously published sequence information, oligonucleotide primers were generated based on conserved sequences surrounding the hypervariable capsid protein gene regions. Analysis of the FCV capsid protein gene hypervariable regions was completed by sequencing products of FCV nucleic acid amplified by reverse transcription and polymerase chain reaction. From these data, amino acid substitutions in the hypervariable regions of the capsid protein were identified for those isolates that did not hybridize with the original cDNA clones. An association between phylogenetic relationships and serum neutralization was established among FCV isolates examined.


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