Human papillomavirus-16 and -18 in penile carcinomas: DNA methylation, chromosomal recombination and genomic variation.
Penile carcinomas are frequently associated with high risk human papillomavirus (HPV) types. Because little is known about the molecular biology of this association, we investigated three properties of HPV genomes in penile carcinomas from Brazilian patients: (i) HPV DNA methylation, (ii) junctions between HPV and cellular DNA and (iii) genomic variation. In cervical carcinogenesis, recombination between HPV and chromosomal DNA is frequent and likely necessary for progression, and DNA hypermethylation-specifically of the L1 gene-is a biomarker for cancerous progression. The same mechanisms apparently occur during penile carcinogenesis, because 95 HPV-16 molecules derived from 19 penile lesions had 58% of the CpGs in L1 and 22% in the 5' part of the long control region methylated, more than the percentages found in cervical carcinomas. In addition, 2 out of 3 HPV-18 infections, all present in double infections with HPV-16, showed L1 specific methylation typical of malignant cervical lesions. In 11 out of 15 HPV-16 lesions, we confirmed chromosomal integration by reverse ligation inverted PCR, while 4 samples had concatemeric integrations or episomes. Nine of 17 penile carcinomas contained HPV-16 AA variants, and 8 E variants. As AA variants are relatively rare in Brazilian cohorts of asymptomatic women, the high prevalence in penile carcinomas may indicate a higher risk of progression of AA lesions, as suspected for cervical infections. Our observations of frequent viral DNA methylation, chromosomal integration and the prevalence of high risk variants suggest that HPV-dependent carcinogenesis of the penis and cervix follows similar etiological and epidemiological parameters.
Kalantari
Mina
M
Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, CA 92697, USA.
Villa
Luisa L
LL
Calleja-Macias
Itzel E
IE
Bernard
Hans-Ulrich
HU
D036022:Capsid Proteins / Q000235:genetics; D019175:DNA Methylation; D004279:DNA, Viral / Q000235:genetics; D014644:Genetic Variation; D016679:Genome, Viral; D052162:Human papillomavirus 16 / Q000235:genetics*; D052161:Human papillomavirus 18 / Q000235:genetics*; D006801:Humans; D008297:Male; D009856:Oncogene Proteins, Viral / Q000235:genetics; D030361:Papillomavirus Infections / Q000150:complications / Q000821:virology*; D010412:Penile Neoplasms / Q000821:virology*; D016133:Polymerase Chain Reaction; D011401:Promoter Regions, Genetic; D011995:Recombination, Genetic; D016662:Virus Integration / Q000235:genetics
D036022:Capsid Proteins; D004279:DNA, Viral; D009856:Oncogene Proteins, Viral; C063317:L1 protein, Human papillomavirus type 16