title: Steroid 5alpha-reductase 2 gene melting polymorphisms in male subjects with azoospermia or oligospermia.
abstract: OBJECTIVE
  This study was designed to test the hypothesis that mutations in the gene for type 2 steroid 5alpha-reductase (SRD5A2) may be the cause of a phenotype characterized primarily by oligospermia or azoospermia.
  
  
  METHODS
  Deoxyribonucleic acid from control subjects and subjects with oligospermia (n = 12) and azoospermia (n = 6) were evaluated for mutations in SRD5A2. Methods used for mutation analysis included polymerase chain reaction, Southern blotting, and denaturing gradient gel electrophoresis.
  
  
  RESULTS
  Denaturing gradient gel electrophoresis of all 5 amplified exons resulted in similar migration patterns in samples from both control and study subjects. Genomic deoxyribonucleic acid subjected to denaturing gradient gel electrophoresis after restriction digest revealed melting polymorphisms. Direct sequencing of the gene in a single patient with a unique melting polymorphism yielded a normal sequence.
  
  
  CONCLUSIONS
  Melting polymorphisms for SRD5A2 were detected in a group of patients with oligospermia or azoospermia. Sequence analysis did not demonstrate functional mutations in the coding sequence of this gene.
authors.affiliation: Division of Reproductive Endocrinology, Department of Obstetrics and Gynecology, The University of Mississippi Medical Center, Jackson, USA.
authors.forename: R S
authors.initials: RS
authors.lastname: Hines
authors.forename: S P
authors.initials: SP
authors.lastname: Tho
authors.forename: M A
authors.initials: MA
authors.lastname: Behzadian
authors.forename: P G
authors.initials: PG
authors.lastname: McDonough
mesh_terms: D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase / Q000235:genetics*; D015139:Blotting, Southern; D004247:DNA / Q000032:analysis; D015247:Deoxyribonuclease HindIII; D015252:Deoxyribonucleases, Type II Site-Specific; D004591:Electrophoresis, Polyacrylamide Gel; D005091:Exons; D006801:Humans; D008297:Male; D009154:Mutation; D009845:Oligospermia / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length
chemical_list: D004247:DNA; D013741:3-Oxo-5-alpha-Steroid 4-Dehydrogenase; D015247:Deoxyribonuclease HindIII; D015252:Deoxyribonucleases, Type II Site-Specific; C024403:GGCC-specific type II deoxyribonucleases