title: Lack of an association between environmental exposure to polychlorinated biphenyls and p,p'-DDE and DNA damage in human sperm measured using the neutral comet assay.
abstract: BACKGROUND
  Chlorinated organic chemicals, such as polychlorinated biphenyls (PCB), hexachlorobenzene (HCB), dichlorodiphenyl trichloroethane (DDT), and dichlorodiphenyl dichloroethene (DDE, the most stable daughter compound of DDT) are persistent lipophilic compounds found in a large portion of the general population. To explore the hypothesis that environmental exposure to these compounds is associated with altered DNA integrity in human sperm, a study of 212 male partners of a sub-fertile couple who presented to the Massachusetts General Hospital Andrology Laboratory was conducted.
  
  
  METHODS
  The neutral single cell microgel electrophoresis assay (comet assay) was used to assess DNA integrity in sperm. VisComet image analysis software was used to measure total comet length, the proportion of DNA present in the comet tail, and tail distributed moment, an integrated measure of length and intensity.
  
  
  RESULTS
  In the regression analyses, there were no statistically significant consistent associations between the comet assay parameters and any of the individual PCB congeners, sum of PCB, or p,p'-DDE.
  
  
  CONCLUSIONS
  These results suggest that there are not strong relationships between adult levels of these chlorinated organic compounds and sperm DNA damage as measured by the comet assay.
authors.affiliation: Department of Environmental Health, Occupational Health Program, Harvard School of Public Health, Boston, MA 02115, USA. rhauser@hohp.harvard.edu
authors.forename: R
authors.initials: R
authors.lastname: Hauser
authors.forename: N P
authors.initials: NP
authors.lastname: Singh
authors.forename: Z
authors.initials: Z
authors.lastname: Chen
authors.forename: L
authors.initials: L
authors.lastname: Pothier
authors.forename: L
authors.initials: L
authors.lastname: Altshul
mesh_terms: D000328:Adult; D020552:Comet Assay / Q000379:methods*; D004247:DNA / Q000032:analysis; D004249:DNA Damage; D003633:Dichlorodiphenyl Dichloroethylene / Q000097:blood*; D004781:Environmental Exposure; D006801:Humans; D007246:Infertility; D008297:Male; D011078:Polychlorinated Biphenyls / Q000097:blood*; D012044:Regression Analysis; D013094:Spermatozoa / Q000737:chemistry*
chemical_list: D003633:Dichlorodiphenyl Dichloroethylene; D004247:DNA; D011078:Polychlorinated Biphenyls