Journal Article

The Effects of Circumcision on the Penis Microbiome

Liu, Cindy M., Ravel, Jacques, Johnson, Kristine E., Aziz, Maliha, Serwadda, David, Price, Lance B., Lau, Matthew K., Bowers, Jolene, Wawer, Maria J., Keim, Paul S., Gray, Ronald H.

2010

Overview

Circumcision is associated with significant reductions in HIV, HSV-2 and HPV infections among men and significant reductions in bacterial vaginosis among their female partners. We assessed the penile (coronal sulci) microbiota in 12 HIV-negative Ugandan men before and after circumcision. Microbiota were characterized using sequence-tagged 16S rRNA gene pyrosequencing targeting the V3-V4 hypervariable regions. Taxonomic classification was performed using the RDP Naïve Bayesian Classifier. Among the 42 unique bacterial families identified, Pseudomonadaceae and Oxalobactericeae were the most abundant irrespective of circumcision status. Circumcision was associated with a significant change in the overall microbiota (PerMANOVA p = 0.007) and with a significant decrease in putative anaerobic bacterial families (Wilcoxon Signed-Rank test p = 0.014). Specifically, two families-Clostridiales Family XI (p = 0.006) and Prevotellaceae (p = 0.006)-were uniquely abundant before circumcision. Within these families we identified a number of anaerobic genera previously associated with bacterial vaginosis including: Anaerococcus spp., Finegoldia spp., Peptoniphilus spp., and Prevotella spp. The anoxic microenvironment of the subpreputial space may support pro-inflammatory anaerobes that can activate Langerhans cells to present HIV to CD4 cells in draining lymph nodes. Thus, the reduction in putative anaerobic bacteria after circumcision may play a role in protection from HIV and other sexually transmitted diseases.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Acids / Agroforestry / Anaerobes / Anaerobic bacteria / Analysis / Bacteria / Bacteria, Anaerobic - classification / Bacteria, Anaerobic - genetics / Bacteria, Anaerobic - isolation & purification / Bayes Theorem / Bayesian analysis / Biodiversity / CD4 antigen / Circumcision / Circumcision, Male / Community ecology / Computational Biology/Metagenomics / Dendritic cells / Dermatology/Skin Infections / Disease prevention / Disease transmission / Ecology/Community Ecology and Biodiversity / Genera / Genomics / HIV / Human immunodeficiency virus / Human papillomavirus / Humans / Immunology / Infection / Infections / Infectious Diseases / Infectious Diseases/Bacterial Infections / Infectious Diseases/Gynecologic Infections / Infectious Diseases/HIV Infection and AIDS / Infectious Diseases/Sexually Transmitted Diseases / Infectious Diseases/Urological Infections / Inflammation / Langerhans cells / Lymph nodes / Male / Mens health / Microbiology / Microbiology/Medical Microbiology / Microbiota (Symbiotic organisms) / Multivariate analysis / Papillomavirus infections / Penis / Penis - microbiology / Public health / Public Health and Epidemiology / Public Health and Epidemiology/Infectious Diseases / RNA / RNA, Bacterial - genetics / RNA, Ribosomal, 16S - genetics / rRNA 16S / Sexually transmitted diseases / Species Specificity / Statistical methods / STD / Taxonomy / Vaginosis / Variance analysis