Get Dictyostelium: Evolution, Cell Biology, and the Development PDF

By Richard H. Kessin

ISBN-10: 0511525311

ISBN-13: 9780511525315

ISBN-10: 0521583640

ISBN-13: 9780521583640

The Dictyostelia are soil amoebae in a position to awesome feats of survival, motility, chemotaxis, and improvement. often called the "social amoebae," those organisms were the themes of great learn because the Thirties. study during this zone has been instrumental in shaping normal perspectives of differentiation, morphogenesis, and verbal exchange. starting with the background of Dictyostelids, this booklet considers the issues of the evolution of this multicellular organism. characterised via its skill to rework from a single-celled organism into an complex assemblage of hundreds of thousands of synchronously-moving cells, every one degree of its improvement is taken care of in a separate bankruptcy. The specified houses of the Dictyostelid genome are carefully analyzed, and the tools on hand to control genes are offered intimately. study suggestions that let many telephone biology difficulties to be approached in learning the organism also are awarded. all through, the emphasis is on combining classical experiments with smooth molecular findings.

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Additional resources for Dictyostelium: Evolution, Cell Biology, and the Development of Multicellularity (Developmental and Cell Biology Series)

Sample text

In slugs formed from chimeras, the mutant cells always populate the zones that are fated to give rise to spores (Fig. 6). The affected gene has been recovered and codes for a protein that acts in proteolysis by binding target proteins to the proteolytic machinery. This causes ubiquitination of the proteins and leads to their degradation. Competition among amoebae during growth and development need not lead to a cell that preferentially forms a spore because it ignores signals to be stalk. If in the aggregate those with more developed chemotactic mechanisms or better motility reach a zone from which spores are more likely to arise, this strain will have a selective advantage in propagation.

The ribosomal analysis gives an early divergence of Dictyostelium before the evolution of the plants, animals, and fungi. The results of most protein analyses give a divergence time that is still early, but more or less at the time of the crown group organisms. 8 shows a recent positioning of the Mycetozoa based on a comparison of elongation factor 1 (EF-1 ) sequences (Baldauf and Doolittle, 1997). Note that by this analysis, the Dictyostelids, Physarum, and the Protostelids (which make a fruiting structure with a spore and stalk out of one cell) are all thought to share a common origin, as Raper originally postulated.

As Francis and Eisenberg established, there is a pool of genetic diversity. This natural chimerism has consequences when viewed through the lens of evolutionary theory. , 2000). Natural chimerism in¯uences the evolution of a number of phyla as described by Buss (1982), who pointed out the evolutionary consequences of chimerism and the lack of a germ line. The consequences of chimeric development stem from the fact that in the macrocyst cycle, and in the construction of the fruiting body, many of the cells die, either as endocytes during macrocyst formation or as stalk cells during fruiting body construction.

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Dictyostelium: Evolution, Cell Biology, and the Development of Multicellularity (Developmental and Cell Biology Series) by Richard H. Kessin

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