title: Characterization of Spindlin1 isoform2 in mouse testis.
abstract: OBJECTIVE
  To investigate the expression of Spindlin 1 (Spin 1) isoform2 and assess its function in mouse testis.
  
  
  METHODS
  First, reverse-transcription polymerase chain reaction (RT-PCR) was used to determine whether Spin1 isoform2 is present in mouse testis. Then the expression patterns of the isoform between newborn and adult mice testes were compared by immunoblot analysis. Finally, the diversity of its localization in mice testes at different ages (days 0, 7, 14, 21, 28 and 60) was observed by immunohistochemistry. The localization of the protein in mouse sperm was also investigated by immunofluorescence.
  
  
  RESULTS
  The RT-PCR results show that Spin1 isoform2 is present in mouse testis. As shown by immunoblot analysis, the isoform was more highly expressed in adult testes compared with newborn testes. Interestingly, Spin1 isoform2 did not show up in the cytoplasm of primary spermatocytes until day 14. Also, the protein exists at the tail of the mouse sperm.
  
  
  CONCLUSIONS
  Spin1 isoform2 is a protein expressed highly in adult testis, which might be involved in spermatogenesis and could be necessary for normal sperm motility.
authors.affiliation: Laboratory of Reproductive Medicine, Nanjing Medical University, 140 Hanzhong Road, Nanjing 210029, China.
authors.forename: Ke-Mei
authors.initials: KM
authors.lastname: Zhang
authors.forename: Yu-Feng
authors.initials: YF
authors.lastname: Wang
authors.forename: Ran
authors.initials: R
authors.lastname: Huo
authors.forename: Ye
authors.initials: Y
authors.lastname: Bi
authors.forename: Min
authors.initials: M
authors.lastname: Lin
authors.forename: Jia-Hao
authors.initials: JH
authors.lastname: Sha
authors.forename: Zuo-Min
authors.initials: ZM
authors.lastname: Zhou
mesh_terms: D000367:Age Factors; D000818:Animals; D000831:Animals, Newborn; D015153:Blotting, Western; D018797:Cell Cycle Proteins / Q000235:genetics* / Q000378:metabolism*; D003593:Cytoplasm / Q000378:metabolism; D005260:Female; D007150:Immunohistochemistry; D008297:Male; D008540:Meiosis / Q000502:physiology; D051379:Mice; D008813:Mice, Inbred ICR; D008869:Microtubule-Associated Proteins / Q000235:genetics* / Q000378:metabolism*; D010750:Phosphoproteins / Q000235:genetics* / Q000378:metabolism*; D011247:Pregnancy; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013081:Sperm Motility / Q000502:physiology; D013091:Spermatogenesis / Q000502:physiology; D013737:Testis / Q000502:physiology*
chemical_list: D018797:Cell Cycle Proteins; D008869:Microtubule-Associated Proteins; D010750:Phosphoproteins; C104434:spindlin