Chromosome structure and mitosis in the dinoflagellates: an ultrastructural approach to an evolutionary problem

Spector, D. L., Triemer, R. E. (1981) Chromosome structure and mitosis in the dinoflagellates: an ultrastructural approach to an evolutionary problem. Biosystems, 14. pp. 289-298. ISSN 0303-2647

Abstract

Chromosome structure and mitosis have been examined in three evolutionarily diverse members of the Pyrrophyta. Chromosome uncoiling, revealing the chromonema, has been correlated with the uptake of [3H]thymidine. In addition, chromosome uncoiling has been observed during gamete formation, gamete fusion, and in the nucleolar organizing region of the chromosomes suggesting that dinoflagellate chromosomes undergoing duplication, transcription or pairing have a morphology different from the characteristic tightly banded structure generally observed during most of interphase and mitosis. The dinoflagellate chromonema is composed of 2.5-nm fibers and 9.0-nm granules coiled into a helix around a central core of 9.0-nm fibers. Chromosome attachment to nuclear channels and kinetochore division and separation have been examined in several dinoflagellates. After evaluating many nuclear and cytoplasmic characteristics of the dinoflagellates it appears that this group of organisms are true eukaryotes which may be on the main line to the evolution of the mitotic spindle typical of higher plant and animals cells.U

Item Type:	Paper
Uncontrolled Keywords:	Animals Biological Evolution Chromosomes Dinoflagellida Microscopy, Electron Mitosis Species Specificity
Subjects:	bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification bioinformatics > genomics and proteomics > genetics & nucleic acid processing bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > chromosome bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > chromosomes, structure and function > chromosome bioinformatics > genomics and proteomics > genetics & nucleic acid processing > DNA, RNA structure, function, modification > chromosomes, structure and function evolution organs, tissues, organelles, cell types and functions > organelles, types and functions > mitosis
CSHL Authors:	Spector, David L.
Communities:	CSHL labs > Spector lab
Depositing User:	Matt Covey
Date:	1981
Date Deposited:	10 Dec 2012 19:42
Last Modified:	29 Jan 2015 20:59
Related URLs:	Publisher
URI:	https://repository.cshl.edu/id/eprint/26309

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