title: [Sequence analysis of the late region of human papillomavirus type 6 genome].
abstract: OBJECTIVE
  To study variations of genome late region of human papillomavirus type 6 (HPV-6) isolated from Chinese patients with condyloma acuminatum.
  
  
  METHODS
  Using overlap PCR design, major capsid protein (L1) and minor capsid protein (L2) genes were separately amplified from clinical samples following HPV type determination, and were further assembled into HPV-6 genome late region sequences after inserting into plasmid and sequencing.
  
  
  RESULTS
  Two sequences (GenBank accession number AY015006, AY015008) of HPV-6 late region were assembled, which are 2,869 bp long covering 35% HPV-6 genome and with complete open reading frames (ORFs) for L1 and L2. Compared with prototype sequence, nine point mutations were found, including four missense mutations, three of which were located in L2 ORF. Phylogenetic analysis indicated that the cloned sequences are classified into HPV-6b.
  
  
  CONCLUSIONS
  HPV-6 genome late region, especially in L1 ORF, is very conserved (variation rate < 0.28%). The mutation from A to G at position 7081 in HPV-6 genome and from G to A at 7099 may represent region characteristics. This is the first report that describes sequence variations among genome late region of HPV-6 isolated from Chinese patients.
authors.affiliation: Department of Biophysics, Institute of Basic Medical Sciences, CAMS, PUMC, Beijing 100005, China.
authors.forename: M
authors.initials: M
authors.lastname: Wang
authors.forename: M C
authors.initials: MC
authors.lastname: Zhang
authors.forename: X M
authors.initials: XM
authors.lastname: Xu
authors.forename: L F
authors.initials: LF
authors.lastname: Chen
authors.forename: G X
authors.initials: GX
authors.lastname: Song
mesh_terms: D003218:Condylomata Acuminata / Q000821:virology; D005260:Female; D016679:Genome, Viral; D006801:Humans; D027383:Papillomaviridae / Q000235:genetics* / Q000302:isolation & purification; D017422:Sequence Analysis, DNA