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Journal of Clinical Microbiology, Dec 1996, 2990-2996, Vol 34, No. 12
DR Kilpatrick, B Nottay, CF Yang, SJ Yang, MN Mulders, BP Holloway, MA Pallansch and OM Kew
We have developed a method for differentiating polioviruses from nonpolio
enteroviruses using PCR. A pair of panpoliovirus PCR primers were designed
to match intervals encoding amino acid sequences within VP1 that are
strongly conserved among polioviruses. The initiating primer hybridizes
with codons of a 7-amino-acid sequence that has been found only in
polioviruses; the second primer matches codons of a domain thought to
interact with the cell receptor. The panpoliovirus PCR primers contain
mixed-base and deoxyinosine residues to compensate for the high degeneracy
of the targeted codons. All RNAs from 48 vaccine-related and 110 wild
poliovirus isolates of all three serotypes served as efficient templates
for amplification of 79-bp product. None of the genomic sequences of 49
nonpolio enterovirus reference strains were amplified under equivalent
reaction conditions. Sensitivities of poliovirus detection were as low as
100 fg (equivalent to approximately 25,000 genomic copies or 25 to 250 PFU)
when the amplified products were visualized by ethidium bromide
fluorescence. These degenerate PCR primers should aid in the detection of
all polioviruses, including those wild poliovirus isolates for which
genotype-specific reagents are unavailable.
Copyright © 1996 by the American Society for Microbiology. All rights reserved.
Group-specific identification of polioviruses by PCR using primers containing mixed-base or deoxyinosine residue at positions of codon degeneracy
Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Center for Disease Control and Prevention, Atlanta, Georgia 30333, USA. dyk0@ciddvdl.em.cdc.gov
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