The multicellular nature of filamentous heterocyst-forming cyanobacteria

被引:170
作者
Herrero, Antonia [1 ,2 ]
Stavans, Joel [3 ]
Flores, Enrique [1 ,2 ]
机构
[1] CSIC, Inst Bioquim Vegetal & Fotosintesis, Amer Vespucio 49, E-41092 Seville, Spain
[2] Univ Seville, Amer Vespucio 49, E-41092 Seville, Spain
[3] Weizmann Inst Sci, Dept Phys Complex Syst, IL-76100 Rehovot, Israel
关键词
Anabaena; cell differentiation; cyanobacteria; heterocysts; intercellular communication; multicellularity; STRAIN PCC 7120; ANABAENA-SP PCC-7120; BLUE-GREEN-ALGAE; INTERCELLULAR MOLECULAR-EXCHANGE; BIOLOGICAL PATTERN-FORMATION; N-13-LABELED NITROGEN GAS; GREAT OXIDATION EVENT; SEPTAL PROTEIN SEPJ; ESCHERICHIA-COLI; CELL-DIVISION;
D O I
10.1093/femsre/fuw029
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Cyanobacteria carry out oxygenic photosynthesis, play a key role in the cycling of carbon and nitrogen in the biosphere, and have had a large impact on the evolution of life and the Earth itself. Many cyanobacterial strains exhibit a multicellular lifestyle, growing as filaments that can be hundreds of cells long and endowed with intercellular communication. Furthermore, under depletion of combined nitrogen, filament growth requires the activity of two interdependent cell types: vegetative cells that fix CO2 and heterocysts that fix N-2. Intercellular molecular transfer is essential for signaling involved in the regulation of heterocyst differentiation and for reciprocal nutrition of heterocysts and vegetative cells. Here we review various aspects of multicellularity in cyanobacterial filaments and their differentiation, including filament architecture with emphasis on the structures used for intercellular communication; we survey theoretical models that have been put forward to understand heterocyst patterning and discuss the factors that need to be considered for these models to reflect the biological entity; and finally, since cell division in filamentous cyanobacteria has the peculiarity of producing linked instead of independent cells, we review distinct aspects of cell division in these organisms.The organismic unit in heterocyst-forming cyanobacteria is a filament of interconnected cells; to gain an understanding of multicellularity in these organisms, the authors analyze and discuss their filament structure, theoretical models of heterocyst pattern formation, and their distinct cell division characteristics.The organismic unit in heterocyst-forming cyanobacteria is a filament of interconnected cells; to gain an understanding of multicellularity in these organisms, the authors analyze and discuss their filament structure, theoretical models of heterocyst pattern formation, and their distinct cell division characteristics.
引用
收藏
页码:831 / 854
页数:24
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