Document Detail

Proliferation of dinoflagellates: blooming or bleaching.
MedLine Citation:
PMID:  15954095     Owner:  NLM     Status:  MEDLINE    
The dinoflagellates, a diverse sister group of the malaria parasites, are the major agents causing harmful algal blooms and are also the symbiotic algae of corals. Dinoflagellate nuclei differ significantly from other eukaryotic nuclei by having extranuclear spindles, no nucleosomes and enormous genomes in liquid crystal states. These cytological characteristics were related to the acquisition of prokaryotic genes during evolution (hence Mesokaryotes), which may also account for the biochemical diversity and the relatively slow growth rates of dinoflagellates. The fact that the proliferation of many dinoflagellates is sensitive to turbulence may be due to the physiological requirements of the genome's liquid crystal states. Mechanical stress and anti-microtubule drugs induce cell cycle arrest mainly in G1, implicating a role for the permanent cortical microtubular cytoskeleton in mechanotransduction. The cell cycles of photosynthetic dinoflagellates are also gated by the circadian rhythm, with cell division occurring mainly at the end of the dark phase. Cell growth and the biosynthesis of many toxins occur during the light phase, corresponding to G1 in the cell cycle. The dinoflagellates also embody several options for coupling cell cycle progression to cell growth, enabling them to make the best use of available resources and possibly preparing them for a symbiotic existence.
Joseph T Y Wong; Alvin C M Kwok
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  BioEssays : news and reviews in molecular, cellular and developmental biology     Volume:  27     ISSN:  0265-9247     ISO Abbreviation:  Bioessays     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-06-20     Completed Date:  2005-08-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8510851     Medline TA:  Bioessays     Country:  United States    
Other Details:
Languages:  eng     Pagination:  730-40     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2005 Wiley Periodicals, Inc.
Department of Biology, Hong Kong University of Science and Technology, Hong Kong SAR, People's Republic of China.
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MeSH Terms
Cell Division
Cell Size
Chloroplasts / metabolism
Chromosomes / metabolism
Circadian Rhythm
Cyclins / metabolism
Cytoskeleton / metabolism
DNA, Complementary / metabolism
Dinoflagellida / genetics*,  physiology*
G1 Phase
Histones / chemistry
Microtubules / metabolism
Mitotic Spindle Apparatus
Models, Biological
Reg. No./Substance:
0/Cyclins; 0/DNA, Complementary; 0/Histones

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