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Volume 92, Issue 3

Virulent Marek's disease virus generated from infectious bacterial artificial chromosome clones with complete DNA sequence and the implication of viral genetic homogeneity in pathogenesis Free

Abstract

Genetic homogeneity of a test population is essential to precisely associate a viral genome sequence and its phenotype at the nucleotide level. However, homogeneity is not easy to achieve for Marek's disease virus (MDV) due to its strictly cell-associated replication. To address this problem, two virulent infectious bacterial artificial chromosome (BAC) clones of MDV were generated from an MDV genome previously cloned as five overlapping cosmids. The Md5SN5BAC clone has the BAC vector inserted between the 3′ ends of and , such that no known ORFs should be disrupted. The BAC vector is flanked by P sites, so that it can be deleted from the viral genome by transfecting Md5SN5BAC into a newly developed chicken cell line that constitutively expresses Cre recombinase. The Md5B40BAC clone has the BAC vector replacing a portion of , a location similar to that used by other groups to construct MDV-BAC clones. Although both BACs were capable of producing infectious virulent MDV when inoculated into susceptible chickens, Md5B40BAC-derived viruses showed somewhat better replication and higher virulence. Removal of the BAC vector in Md5SN5BAC-derived viruses had no influence on virulence. Interestingly, when genetically homogeneous virulent MDV generated from Md5B40BAC was mixed with avirulent virus, the overall virulence of the mixed population was noticeably compromised, which emphasizes the importance of MDV population complexity in pathogenesis.

  • Received:
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2011-03-01
2024-04-28
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Virulent Marek's disease virus generated from infectious bacterial artificial chromosome clones with complete DNA sequence and the implication of viral genetic homogeneity in pathogenesis
J. Gen. Virol. 92, 598 (2011); https://doi.org/10.1099/vir.0.026864-0
/content/journal/jgv/10.1099/vir.0.026864-0
/content/journal/jgv/10.1099/vir.0.026864-0
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