title: Evaluation of 172 candidate polymorphisms for association with oligozoospermia or azoospermia in a large cohort of men of European descent.
abstract: BACKGROUND
  In spite of tremendous efforts by a number of groups, the search for single nucleotide polymorphisms (SNPs) strongly associated with male factor infertility by means of gene re-sequencing studies has yielded few likely candidates. A recent pilot, genome-wide SNP association study (GWAS) identified a list of SNPs associated with oligozoospermia and azoospermia. This is an expanded follow-up study of the SNPs identified by the GWAS as well as other SNPs from previously published gene re-sequencing studies.
  
  
  METHODS
  On the basis of the pilot GWAS and SNPs with published associations with male infertility, 172 SNPs were genotyped in men with idiopathic azoospermia or oligozoospermia using the Illumina BeadXpress platform.
  
  
  RESULTS
  Several SNPs were identified or confirmed to be significantly associated with oligozoospermia and/or azoospermia. More importantly, this follow-up study indicates that, at least in Caucasian men, no single common SNP accounts for a significant proportion of spermatogenic failure cases.
  
  
  CONCLUSIONS
  The associations reported in this study are promising, but much larger genome-wide studies will be necessary to confidently validate these SNPs and identify novel SNPs associated with male infertility.
authors.affiliation: Andrology and IVF Laboratories, University of Utah School of Medicine, Salt Lake City, UT, USA.
authors.forename: Kenneth I
authors.initials: KI
authors.lastname: Aston
authors.forename: Csilla
authors.initials: C
authors.lastname: Krausz
authors.forename: Ilaria
authors.initials: I
authors.lastname: Laface
authors.forename: E
authors.initials: E
authors.lastname: Ruiz-Castané
authors.forename: Douglas T
authors.initials: DT
authors.lastname: Carrell
mesh_terms: D053713:Azoospermia / Q000235:genetics*; D005787:Gene Frequency; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D008297:Male; D009845:Oligospermia / Q000235:genetics*; D020641:Polymorphism, Single Nucleotide / Q000235:genetics*; D013076:Sperm Count; D044465:White People