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Nopp 140 involvement in nucleologenesis of mouse preimplantation embryos.

Mol. Reprod. Dev.2001 Jul;59(3):277-84. doi:10.1002/mrd.1032
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摘要


As it was shown earlier, resumption of rRNA transcription in early mouse embryo is localized in the peripheral region of nucleolus precursor body/NPB/during the two-cell stage. Recently, nucleolar phosphoprotein Nopp140 was presented to shuttle between the nucleolus and cytoplasm as chaperone of snoRNPs. Nopp140 interacts with RNA polymerase I in nucleolus and also accumulates in CBs, suggesting a pathway between the two organelles. The aim of the study was to describe the changing location of Nopp140 during the first cleavage stages of mouse embryos and its re-location after inhibition of rRNA synthesis with actinomycin D. Light microscope immunocytochemical staining showed Nopp140 in the periphery of NPBs before activation of rDNA transcription and in addition confirmed its localization in CBs. Immunolabelling with antibodies against RNA Pol I and UBF gave co-localization of these proteins, implicating that Nopp140 may actively participate to rDNA transcription. We suggest that fundamental differences in molecular organization of rDNA synthesis and postranscriptional processes between cycling somatic and pre-implantation embryonic cells may be in selective transport of transcription and/or processing-complexes of proteins to the nucleolar organizer regions (NOR). Mol. Reprod. Dev. 59:277-284, 2001.

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