Dinoflagellates: A remarkable evolutionary experiment

被引:286
作者
Hackett, JD
Anderson, DM
Erdner, DL
Bhattacharya, D [1 ]
机构
[1] Univ Iowa, Dept Sci Biol, Iowa City, IA 52242 USA
[2] Univ Iowa, Ctr Comparat Genet, Iowa City, IA 52242 USA
[3] Woods Hole Oceanog Inst, Dept Biol, Woods Hole, MA 02543 USA
关键词
dinoflagellate; endosymbiosis; evolution; harmful algal blooms;
D O I
10.3732/ajb.91.10.1523
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
In this paper. we focus on dinoflagellate ecology, toxin production, fossil record, and a molecular phylogenetic analysis of hosts and plastids. Of ecological interest are the swimming and feeding behavior, bioluminescence, and symbioses of dinoflagellates with corals. The many varieties of dinoflagellate toxins, their biological effects, and current knowledge of their origin are discussed. Knowledge of dinoflagellate evolution is aided by a rich fossil record that can be used to document their emergence and diversification. However, recent biogeochemical studies indicate that dinoflagellates may be much older than previously believed. A remarkable feature of dinoflagellates is their unique genome structure and gene regulation. The nuclear genomes of these algae are of enormous size, lack nucleosomes. and have permanently condensed chromosomes. This chapter reviews the current knowledge of gene regulation and transcription in dinoflagellates with regard to the unique aspects of the nuclear genome. Previous work shows the plastid genome of typical dinoflagellates to have been reduced to single-gene minicircles that encode only a small number of proteins. Recent studies have demonstrated that the majority of the plastid genome has been transferred to the nucleus, which makes the dinoflagellates the only eukaryotes to encode the majority of typical plastid genes in the nucleus. The evolution of the dinoflagellate plastid and the implications of these results for understanding organellar genome evolution are discussed.
引用
收藏
页码:1523 / 1534
页数:12
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