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Evidence for a double-helically coiled toroidal chromonema in the dinoflagellate chromosome |
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| Authors: | Berl R Oakley John D Dodge |
| Institution: | (1) Department of Botany, Birkbeck College, University of London, UK;(2) Present address: Department of Pharmacology, College of Medicine and Dentistry of New Jersey-Rutgers Medical School, P.O. Box 101, 08854 Piscataway, New Jersey, USA;(3) Present address: Department of Botany, Royal Holloway College, Callow Hill, GU25 4LN Virginia Water, Surrey, England |
| Abstract: | The structure of the dinoflagellate chromosome is examined using spread whole mounts and serial sectioning. Evidence is presented that the chromosome is composed of a toroidal bundle of DNA strands which is coiled plectonemically into a tight double helix. This structure is apparent in interphase whole-mount chromosomes and by careful analysis of serial sectioning can be shown in all mitotic stages. It is particularly apparent in the arms of replicating  Y shaped chromosomes which often uncoil slightly (either naturally or as a result of the fixation used). A model is presented which is based on these results and recent genetic and biochemical data. |
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