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. 1996 Mar;104(6):414-21.
doi: 10.1007/BF00352265.

HSP70-2 is part of the synaptonemal complex in mouse and hamster spermatocytes

J W Allen  1 , D J Dix, B W Collins, B A Merrick, C He, J K Selkirk, P Poorman-Allen, M E Dresser, E M Eddy
Affiliations

HSP70-2 is part of the synaptonemal complex in mouse and hamster spermatocytes

J W Allen et al. Chromosoma. 1996 Mar.

Abstract

Mouse spermatogenic cells are known to express HSP70-2, a member of the HSP70 family of heat-shock proteins. The purpose of the present study was to characterize further the expression and localization of HSP70-2 in meiotic cells of mice and hamsters. After separating mouse spermatogenic cells into cytoplasmic and nuclear fractions, proteins were separated by two-dimensional gel electrophoresis and detected with HSP-specific antibodies. Of several HSP70 proteins identified in the cytoplasm, only HSC70 and HSP70-2 were also detected in the nucleus. Immunocytological analyses of spermatocyte prophase cells revealed that HSP70-2 was associated with the synaptonemal complex. Surface-spread synaptonemal complexes at pachytene and diplotene stages labeled distinctly with the antiserum to HSP70-2. Synaptonemal complexes from fetal mouse oocytes failed to show any evidence of HSP70-2. Reverse-transcriptase-polymerase chain reaction (RT-PCR) analyses of gene expression confirmed this sex specificity; Hsp70-2 mRNA was detected in mouse testes, but not ovaries. These findings are suggestive of a previously unsuspected sexual dimorphism in structure and/or function of the synaptonemal complex.

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