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• W2079607583 abstract "The structure-function relationships of the nucleolar substructures were studied in preimplantation rabbit embryos, where nucleologenesis is extending over the first four cell cycles and may not be synchronous in each blastomere. Immunocytochemical methods using light and electron microscopy were applied for protein and RNA localization as well as nick translation and terminal deoxynucleotidyl transferase techniques for DNA detection. DNA was gradually associated with the periphery of the compact nucleolar precursor bodies (NPBs) but was never found inside NPBs at the four-cell stage. In 16-cell embryos, some NPBs displayed a reticulated periphery forming the branching network of the dense fibrillar component (DFC) surrounding the “residual body” (remnant of NPB) in the process of activation. At the 32-cell stage, fully reticulated nucleoli were observed in each blastomere. DNA was then associated with the DFC of reticulated nucleoli. RNA was first detected at the 16 cell-stage in close contact with the DFC as well as inside the “residual body” which was not immunolabeled with the DNA antibodies used. When observed by light microscopy, fibrillarin, nucleolin, and protein B23 displayed a changing distribution pattern during nucleologenesis. At early stages (up to the 16-cell stage), small dot- and spot-like structures were distributed within the whole nuclei. In 16-cell embryos, these proteins started to accumulate in an irregular thin layer around the NPBs in the process of activation. The reorganization process described may be in relation with the redistribution of chromatin and nuclear/nucleolar matrix components during the activation of rDNA transcription localized in the NPB shell. In conclusion, nucleologenesis is only achieved at the fourth cell cycle in the cleaving rabbit embryo at the corresponding time when the first detectable nucleolus-associated RNA is detectable. Our results show a good correlation between the establishment of structure and function. Mol. Reprod. Dev. 48:34–44, 1997. © 1997 Wiley-Liss, Inc." @default.
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• W2079607583 date "1997-09-01" @default.
• W2079607583 modified "2023-10-16" @default.
• W2079607583 title "Nucleolar substructures of rabbit cleaving embryos: An immunocytochemical study" @default.
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• W2079607583 doi "https://doi.org/10.1002/(sici)1098-2795(199709)48:1<34::aid-mrd5>3.0.co;2-q" @default.
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