Abstract
Localization of Calliphora erythrocephala chromosome 6 in a 3D nuclear space at different stages of nurse cell chromatin polytenization was analyzed by fluorescence in situ hybridization and 3D microscopy. The obtained results suggest a large-scale chromatin relocation in the C. erythrocephala nurse cell nuclei, which is accompanied by a change in the chromosome territory of chromosome 6 associated with the change in expression activity of the nucleus and formation of reticular chromatin structure. It was revealed that the relocation of chromosome 6 (nucleolus organizer chromosome) is accompanied by fragmentation of the single large nucleolus into micronucleoli, which are spread over the entire nuclear space being associated with their nucleolar organizer regions. Presumably, the chromosome 6 material during transition to a highly polytenized structure is redistributed in the nucleus so that the inactive pericentromeric regions are displaced to the nuclear periphery, while the chromosome regions carrying rDNA sequences loop out beyond the chromosome territory. Being dispersed over the entire nuclear space, rDNA sequences are likely to be amplified, thereby providing numerous small signals from the chromosome 6-specific DNA probe. Micronucleoli are formed around the actively transcribed nucleolar organizer regions.
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Acknowledgments
We thank Dr. A.A. Miller for the helpful in electron microscopical study and Dr. S.I. Baiborodin for the helpful in confocal microscopical analysis. The work was supported by the Russian Foundation for Basic Research (grant no. 10-04-01059a).
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The authors declare that they have no conflict of interest.
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Kokhanenko, A.A., Anan’ina, T.V. & Stegniy, V.N. The changes in chromosome 6 spatial organization during chromatin polytenization in the Calliphora erythrocephala Mg. (Diptera: Calliphoridae) nurse cells. Protoplasma 250, 141–149 (2013). https://doi.org/10.1007/s00709-012-0385-7
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DOI: https://doi.org/10.1007/s00709-012-0385-7