Polymorphism of the capsid L1 gene of human papillomavirus types 31, 33, and 35.

Abstract:

:The L1 gene encodes for the major capsid protein of human papillomaviruses (HPV). There is limited information on the polymorphism of L1 for types related to HPV-16. This report explores the polymorphism of L1 in phylogenetically related types 31, 33, and 35 compared to HPV-16. Genital specimens collected from 732 HIV-seropositive and 323 HIV-seronegative women were screened for HPV DNA with consensus L1 PCR. Cervical samples positive for HPV-16 (n = 74), HPV-31 (n = 78), HPV-33 (n = 37), and HPV-35 (n = 58) were further characterized by PCR-sequencing of the complete L1 gene. The number of nucleotide substitutions within L1 ranged from 19 for HPV-33 to 52 for HPV-31. The ratio of the number of variants/number of isolates tested was higher for HPV-31 (56.4%, P = 0.05) and HPV-35 (60.3%, P = 0.04) compared to HPV-16 (40.5%), while this ratio was lower for HPV-33 (24.3%), although not significantly (P = 0.14). The maximal distance between HPV variants was greater in the five putative surface-exposed loops of L1 than in sequences outside the loops (P < 0.01). Synonymous variations were encountered in 1.7% (95% CI 1.1-2.3) of nucleotides inside the L1 loops and 2.4% (95% CI1.2-3.7) of nucleotides outside the L1 loops. Non-synonymous variations were encountered in 1.8% (95% CI 1.1-2.5) of nucleotides within the L1 loops and 0.2% (95% CI 0-0.4) of nucleotides outside the loops. dN/dS ratios were below 1.0 in extra-loop and intra-loop regions, but they were lower in extra-loop regions. These results suggest that sequences within and outside the hypervariable loops of L1 were under selective constraint.

journal_name

J Med Virol

authors

Cornut G,Gagnon S,Hankins C,Money D,Pourreaux K,Franco EL,Coutlée F,Canadian Women's HIV Study Group.

doi

10.1002/jmv.21777

subject

Has Abstract

pub_date

2010-07-01 00:00:00

pages

1168-78

issue

7

eissn

0146-6615

issn

1096-9071

journal_volume

82

pub_type

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