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Arriving at a correlation between the flagellar arrangement and multicellularity

Advances in Bioscience and Biotechnology 2013年第1期4卷 93-102页

作者： Suruchi Jamkhedkar jyotsna dongerdive Kavita Jain Siby Abraham Jacinta S. D’Souza Computer Science Department University of Mumbai Kalina Campus Mumbai India Department of Atomic Energy Centre for Excellence in Basic Sciences University of Mumbai Kalina Campus Mumbai India Life Sciences Department University of Mumbai Kalina Campus Mumbai India Mathematics and Statistics Department G. N. Khalsa College of Arts Science and Commerce Mumbai India

Cilia and flagella are organelles of motility that enable cells to swim or move liquid over its surface. An exhaustive literature survey for the presence of the organelle in organisms across phyla showed that most animal cells harbor cilia in contrast to very few fungal cells. While this was not unexpected, it was the position and arrangement of this organelle in each cell that intrigued our attention. Natural selection might have favored motility over chemotaxis;and it would have done so to evolve a stable structure that could have undergone an optimization process requiring a precise geometry in the shape of cells and the structure that would help cells to move. The positioning of such a structure would play a pre-dominant role in optimal motility. It is now known that the flagellar position of a cell is a genetically distinct trait, occasionally used in phylogeny of bacteria, distributed in distinguishing patterns over cellular surface, but basically are of two types, either polar (one flagellum arising from one pole per cell) or peritrichous (lateral flagella distributed over the entire cell surface). Irrespective of the cellular habitat, flagella origin, ultrastructure and proteome, the present investigation surveyed 26 sub-types of flagellar arrangements from as many species as possible. A peculiar pattern ensued-Prokaryotes harbored predominantly polar and peritrichous types;eukaryotes showed a mere change of the peritrichous one. These numbers when used to create a Similarity tree depicted a similarity distance of 14 between the Eubacteria and Archaebacteria forming the first neighborhood;Protozoans, Algae, Fungi, Plantae and Animalia formed a second neighborhood. We offer a working hypothesis for this pattern and the gradual shift in the flagellar arrangement from polar, peritrichous, sub-apical, and apical to lateral throughout evolution.

关键词： Flagella Cilia Polar Peritrichous Multicellularity Flagellar Arrangement

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