Histochemistry and Cell Biology

, Volume 105, Issue 2, pp 153–161 | Cite as

Three-dimensional analysis of the arrangement of compact chromatin in the nucleus of G0 rat lymphocytes

  • Gabriel López-Velázquez
  • Jorge Márquez
  • Ernestina Ubaldo
  • Gabriel Corkidi
  • Olga Echeverría
  • Gerardo H. Vázquez Nin
Original Paper

Abstract

The arrangement of compact chromatin of G0 lymphocytes was studied in three-dimensional reconstructions of the ensemble of the chromatin and of individual compact chromatin bodies. Rat spleen was serially cut and sections were contrasted with procedures preferential for DNA. Electron microscopy images were digitized, processed, and displayed using a commercial soft-ware package, complemented by a system for three-dimensional reconstruction and analysis developed by us on an IBM-compatible microcomputer provided with an image acquisition board. The reconstructions showed a continuous layer of compact chromatin in contact with the nuclear envelope that prevents the automatic recognition of individual chromatin clumps. The ensemble of the arrangement of compact chromatin was found to be very similar in different lymphocytes. After morphological filtering procedures, the initial mass was divided into individual bodies of compact chromatin, which were tagged. Most of these bodies contact the nuclear envelope. The number of bodies as well as the number of contacts with the envelope are similar and correspond to a haploid number of chromosomes. The largest body is always the one containing nucleolus-associated chromatin. When the cell has two nucleoli, the nucleolus-associated chromatin bodies contact the envelope in diametrically opposed areas. This feature was also described in rat liver cells. It is concluded that: (a) the individualized compact chromatin bodies do not correspond to an entire chromosome or to a pair of chromosomes; (b) the arrangement of compact chromatin is not identical in each G0 lymphocyte, but there are patterns that are repeated with limited changes; and (c) there are common features that appear in different cell types of individuals of the same species.

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • Gabriel López-Velázquez
    • 1
  • Jorge Márquez
    • 2
  • Ernestina Ubaldo
    • 1
  • Gabriel Corkidi
    • 2
  • Olga Echeverría
    • 1
  • Gerardo H. Vázquez Nin
    • 1
  1. 1.Laboratory of Electron Microscopy, Department of Biology, Faculty of SciencesUNAMMéxicoMexico
  2. 2.Laboratory of Image Processing, Center of InstrumentsUNAMMexico

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