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Multiparameter microscopic analysis of nucleolar structure and ribosomal gene transcription

  • Robert Feulgen Lecture 1996
  • Published:
Histochemistry and Cell Biology Aims and scope Submit manuscript

Abstract

A survey of novel microscopic approaches for structural and functional analysis of subnucleolar compartments will be presented. Research on nucleolar structure and function concentrates predominantly on two distinct types of nucleoli: (1) nucleoli present during the interphase of the cell cycle in somatic tissue culture cells and (2) nucleoli present in meiotic cells, e.g. oocytes of amphibians. These nucleoli are found during meiotic prophase of oogenesis and are functional during several months of the diplotene stage of oogenesis. A further characteristic is the fact that these nucleoli are extra-chromosomal, since they originate by selective ribosomal DNA (rDNA) amplification during the early pachytene stage of oogenesis. Miller-type chromatin spread preparations using transcriptionally active nucleoli, to a major part, contributed to our undertanding of the structural organization of polymerase I directed pre-rRNA transcription. Although the structural organization of the template-associated pre-rRNA transcript is known in some detail from chromatin spreads, relatively little is known about structural aspects of pre-rRNA processing. In order to investigate this intriguing question in more detail, we have developed a computer-based densitometry analysis of both template-associated and template-dissociated pre-rRNA transcripts in order to follow the structural modification of pre-rRNA transcripts during processing. Another line of experiments is devoted to the in situ structure of actively transcribing genes in the nucleolus. In order to bridge the gap between light microscopy and electron microscopy we started video-enhanced light microscopical analysis of actively transcribing genes. Although the dimensions of individual spread genes are critical for detection by optical microscopy, we succeeded in obtaining the first series of images of transcribing genes in their ‘native’ hydrated state. An additional promising type of microscopy is transmission X-ray microscopy. Recent progress in instrumentation as well as in sample preparation has allowed us to obtain the first images of density distribution within intact, fully hydrated nucleoli using amplitude-contrast and/or phase-contrast X-ray microscopy of non-contrasted, fully hydrated nucleoli at different states of transcriptional activity. Whereas the above mentioned investigations using video microscopy and X-ray microscopy are predominantly applicable to the analysis of amplified nucleoli in amphibian oocytes, which are characterized by an extremely high transcription rate of 80–90% of rDNA genes per individual nucleolus, structural analysis of the in situ arrangement of actively transcribing genes in somatic nucleoli as present in the interphase nucleus is far more difficult to perform, mainly due to the much lower number of simultaneously transcribed active genes per individual nucleolus. Visualization of actively transcribed gene clusters is approached by an integrated experimental assay using video microscopy, confocal laser scan microscopy, and antibodies against specific nucleolar proteins.

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Authors and Affiliations

  1. Biomedical Structure Analysis (0195), German Cancer Research Centre (DKFZ), Im Neuenheimer Feld 280, D-69120, Heidelberg, Germany

    M. F. Trendelenburg, H. Tröster & H. Spring

  2. A.N. Belozersky Institute of Physics, Chemistry and Biology, Moscow State University, Moscow, Russia

    O. V. Zatsepina

  3. Institute of X-Ray Physics, University of Göttingen, Göttingen, Germany

    D. Rudolph & G. Schmahl

  4. Medical Physics (0525) German Cancer Research Centre, Heidelberg, Germany

    T. Waschek & W. Schlegel

Authors
  1. M. F. Trendelenburg
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  2. O. V. Zatsepina
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  3. T. Waschek
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  4. W. Schlegel
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  5. H. Tröster
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  6. D. Rudolph
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  7. G. Schmahl
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  8. H. Spring
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Correspondence to M. F. Trendelenburg.

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Trendelenburg, M.F., Zatsepina, O.V., Waschek, T. et al. Multiparameter microscopic analysis of nucleolar structure and ribosomal gene transcription. Histochem Cell Biol 106, 167–192 (1996). https://doi.org/10.1007/BF02484399

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