Characterization of Spindlin1 isoform2 in mouse testis.
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.
Zhang
Ke-Mei
KM
Laboratory of Reproductive Medicine, Nanjing Medical University, 140 Hanzhong Road, Nanjing 210029, China.
Wang
Yu-Feng
YF
Huo
Ran
R
Bi
Ye
Y
Lin
Min
M
Sha
Jia-Hao
JH
Zhou
Zuo-Min
ZM
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*
D018797:Cell Cycle Proteins; D008869:Microtubule-Associated Proteins; D010750:Phosphoproteins; C104434:spindlin