1887

Abstract

Human papillomavirus type 6 (HPV-6) is the causative agent of condyloma acuminata, a common sexually transmitted disease. Virus-like particles (VLPs) assembled from the L1 major capsid protein represent promising candidates for prophylactic vaccines. However, any intratype sequence variation among HPV-6 L1 ORFs will influence which sequence is used for a vaccine according to its prevalence in the population and its propensity for VLP production. Therefore, we have analysed the entire L1 nucleotide sequence of 17 clinical isolates of HPV-6 from the London area. We found 28 positions where changes from the prototype HPV-6b L1 occurred, showing that HPV-6 L1 intratype variation is greater than previously reported. The most frequently observed substitutions are clustered into three discrete regions: R1 (nt 5920-6075), R2 (nt 6590-6670) and R3 (nt 7070-7230). Indeed, most of the nucleotide substitutions within the HPV-6 L1 reported worldwide also map to these regions. The R3 region contains predominantly non-silent substitutions, the most common of which is a G-to-C substitution at position 7079. This results in a Glu-to-Gln change at aa 431, although this change had no effect on VLP yield or stability. This substitution defines a new HPV-6 L1 amino acid sequence that is more abundant in the isolates examined than any other reported sequence.

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1999-04-01
2022-05-28
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