Genetic recombination in wild-type poliovirus.
Poliovirus isolates were screened for recombinants by combined analysis of two distant polymorphic segments of the poliovirus genome (one in the capsid and the other in the polymerase-coding region). Using a restriction fragment length polymorphism (RFLP) assay, a high number of recombinant genomes was found among vaccine-derived strains excreted by poliovirus vaccine vaccinees or vaccine-associated paralytic poliomyelitis cases. Some of these subjects carried a wild-type poliovirus (non-vaccine-specific) nucleotide sequence in the 3' part of the genome. Using a similar approach, a collection of wild-type poliovirus strains isolated in South India between 1985 and 1993 was screened for recombinants. Genotypes were defined by the parallel application of RFLP assays and genomic sequencing of the capsid protein VP1 and the 3D polymerase polypeptide. Analyses revealed several instances where the position of an isolate on the phylogenic tree for the capsid protein-coding segment did not agree with its position on the tree for the polymerase-coding region. In this way, several wild-type/wild-type and wild-type/vaccine recombinants could be identified, indicating that recombination is encountered commonly in the natural evolution of poliovirus strains.
Dahourou
George
G
Epidémiologie Moléculaire des Entérovirus, Institut Pasteur, Paris, France1.
Guillot
Sophie
S
Epidémiologie Moléculaire des Entérovirus, Institut Pasteur, Paris, France1.
Le Gall
Olivier
O
IPV, IBVM, INRA Bordeaux-Aquitaine, BP 81, 33883 Villenave d'Ornon Cedex, France2.
Crainic
Radu
R
Epidémiologie Moléculaire des Entérovirus, Institut Pasteur, Paris, France1.
D036022:Capsid Proteins / Q000235:genetics; D005838:Genotype; D006801:Humans; D008969:Molecular Sequence Data; D010802:Phylogeny; D011051:Poliomyelitis / Q000382:microbiology; D017955:Poliovirus / Q000145:classification / Q000235:genetics*; D011055:Poliovirus Vaccine, Oral; D012150:Polymorphism, Restriction Fragment Length; D012324:RNA-Dependent RNA Polymerase / Q000235:genetics; D011995:Recombination, Genetic; D017422:Sequence Analysis, DNA
D036022:Capsid Proteins; D011055:Poliovirus Vaccine, Oral; C442540:VP1 protein, Poliovirus; C090443:polymerase 3Dpol, poliovirus; D012324:RNA-Dependent RNA Polymerase