title: Analysis of sperm telomere length in men with idiopathic infertility.
abstract: OBJECTIVE
  Telomeres are multifunctional nucleoprotein domains with hexanucleotide tandem repeat (5' TTAGGG 3') sequences, which cap the chromosome ends. However, the role of telomere and its length in sperm with regard to fertility remains unknown.
  
  
  METHODS
  In this pilot study, we analyzed 32 idiopathic infertile men and 25 controls for sperm telomere length by quantitative polymerase chain reaction (Q-PCR), and correlated it with sperm DNA fragmentation index (DFI) and reactive oxygen species (ROS) levels.
  
  
  RESULTS
  The relative sperm mean telomere length (T/S) of infertile men was found to be significantly lower (p < 0.005) when compared to controls (0.674 ± 0.028 vs. 0.699 ± 0.030). None of the sperm parameters such as sperm count, forward motility, morphology, ROS, and DFI were found to correlate with the sperm telomere length.
  
  
  CONCLUSIONS
  Shorter telomeres in sperm may be one of the causative factors responsible for male infertility, but further detailed studies are needed to confirm these findings.
authors.affiliation: Laboratory for Molecular Reproduction and Genetics, Department of Anatomy, All India Institute of Medical Sciences, New Delhi 110029, India.
authors.forename: J
authors.initials: J
authors.lastname: Thilagavathi
authors.forename: M
authors.initials: M
authors.lastname: Kumar
authors.forename: S S
authors.initials: SS
authors.lastname: Mishra
authors.forename: S
authors.initials: S
authors.lastname: Venkatesh
authors.forename: R
authors.initials: R
authors.lastname: Kumar
authors.forename: R
authors.initials: R
authors.lastname: Dada
mesh_terms: D016022:Case-Control Studies; D053938:DNA Fragmentation; D006801:Humans; D007248:Infertility, Male / Q000378:metabolism / Q000473:pathology*; D008297:Male; D010865:Pilot Projects; D017382:Reactive Oxygen Species / Q000378:metabolism; D012661:Semen / Q000378:metabolism; D013094:Spermatozoa / Q000473:pathology*; D016615:Telomere / Q000473:pathology*
chemical_list: D017382:Reactive Oxygen Species