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Journal of Virology, January 1999, p. 51-54, Vol. 73, No. 1
Respiratory and Enteric Viruses Branch,
National Center for Infectious Diseases, Centers for Disease
Control and Prevention, Atlanta, Georgia 30033
Received 29 June 1998/Accepted 5 October 1998
High mutation rates typical of RNA viruses often generate a unique
viral population structure consisting of a large number of genetic
microvariants. In the case of viral pathogens, this can result in rapid
evolution of antiviral resistance or vaccine-escape mutants. We
determined a direct estimate of the mutation rate of measles virus, the
next likely target for global elimination following poliovirus. In a
laboratory tissue culture system, we used the fluctuation test method
of estimating mutation rate, which involves screening a large number of
independent populations initiated by a small number of viruses each for
the presence or absence of a particular single point mutation. The
mutation we focused on, which can be screened for phenotypically,
confers resistance to a monoclonal antibody (MAb 80-III-B2). The entire H gene of a subset of mutants was sequenced to verify that the resistance phenotype was associated with single point mutations. The
epitope conferring MAb resistance was further characterized by Western
blot analysis. Based on this approach, measles virus was estimated to
have a mutation rate of 9 × 10
0022-538X/99/$00.00+0
Spontaneous Mutation Rate of Measles Virus: Direct Estimation
Based on Mutations Conferring Monoclonal Antibody
Resistance
5 per base per
replication and a genomic mutation rate of 1.43 per replication. The
mutation rates we estimated for measles virus are comparable to recent
in vitro estimates for both poliovirus and vesicular stomatitis virus.
In the field, however, measles virus shows marked genetic stability. We
briefly discuss the evolutionary implications of these results.
*
Corresponding author. Present address: Respiratory
Diseases Branch, MS-C23, Centers for Disease Control and Prevention,
1600 Clifton Rd., Atlanta, GA 30333. Phone: (404) 639-4820. Fax: (404) 639-3970. E-mail: zha6{at}cdc.gov.
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