Cohesion proteins are present in centromere protein bodies associated with avian lampbrush chromosomes |
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Authors: | Alla?Krasikova Jose?Luis?Barbero Email author" target="_blank">Elena?GaginskayaEmail author |
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Institution: | (1) Biological Research Institute, Saint-Petersburg State University, Oranienbaumskoie sch. 2, Stary Peterhof, Saint-Petersburg, 198504, Russia;(2) Department of Immunology and Oncology, Centro Nacional de Biotecnologia, UAM Campus de Cantoblanco, Madrid, E-28049, Spain |
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Abstract: | Proteins of sister chromatid cohesion are important for maintenance of meiotic chromosome structure and retention of homologous
chromosomes in bivalents during diplotene. Localization of the cohesion proteins within nuclei of growing oocytes merits special
attention, particularly in avian oocytes, in which diplotene chromosomes assume the form of lampbrush chromosomes (LBCs).
We performed indirect immunostaining using antibodies against cohesins SMC1α, SMC1β, SMC3, Rad21, and the SA/STAG family on
chaffinch, pigeon and duck LBCs spreads, and frozen ovary sections. On LBCs spreads, antibodies to the majority of cohesins
showed punctate staining on chromosome axes. LBC lateral loops, where sister chromatids are separated, did not show cohesin
components. The spherical entities attached to the LBCs centromeres in avian germinal vesicles, the so-called protein bodies
(PBs), were enriched in SMC1α, SMC3, Rad21, STAG1 and STAG2. The synaptonemal complex component SYCP3, which also participates
in cohesion, was detected in the axes of avian lampbrush bivalents and, to a greater degree, in the PBs. In vitellogenic oocytes,
cohesion proteins persist in the PBs associated with condensing bivalents when they concentrate into the karyosphere. These
results indicate that cohesion proteins accumulate in centromere PBs in avian oocytes and are involved into structural maintenance
of lampbrush chromosome axes. |
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Keywords: | avian oocyte centromere cohesin lampbrush chromosome protein bodies |
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