title: Erectile dysfunction in Fragile X patients.
abstract: OBJECTIVE
  To report the clinical experience during collecting sperm samples in the Fragile X syndrome (FXS) male patients.
  
  
  METHODS
  Two different polymerase chain reaction (PCR) based methods were used for the molecular diagnosis of FXS. Sperm collection was done mostly according to the laboratory manual of the World Health Organization.
  
  
  RESULTS
  We failed to collect sperm samples from five Fragile X subjects aged 18-60 years as a result of an unexpected erectile dysfunction (ED). Multiple examinations of the same subject at different times, and of different subjects from different provinces examined by different physicians, showed the same result consistently in all the five subjects.
  
  
  CONCLUSIONS
  Erectile reflex is an instinctive response in all healthy males. The absence of erection can be caused by hormonal, physical or neuronal malfunction. As hormonal profiles were reported to be generally normal in Fragile X men, we propose that an unknown physical factor or the neuronal circuit, or both, underlying the erection is compromised. The finding of this symptom in Fragile X patients may help better understand the clinical spectrum and pathogeneses of the disease.
authors.affiliation: Department of Genetics, National Research Institute for Family Planning, Beijing 100081, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Gu
authors.forename: Hai-Yin
authors.initials: HY
authors.lastname: Zhang
authors.forename: Shao-Yi
authors.initials: SY
authors.lastname: Hu
authors.forename: Shang-Zhi
authors.initials: SZ
authors.lastname: Huang
authors.forename: Xu
authors.initials: X
authors.lastname: Ma
authors.forename: Yong-Qing
authors.initials: YQ
authors.lastname: Zhang
mesh_terms: D000293:Adolescent; D000328:Adult; D001483:Base Sequence; D017931:DNA Primers; D007172:Erectile Dysfunction; D005260:Female; D005600:Fragile X Syndrome / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D016133:Polymerase Chain Reaction / Q000379:methods; D013091:Spermatogenesis / Q000235:genetics*
chemical_list: D017931:DNA Primers