Dictyostelium: Evolution, Cell Biology, and the Development by Richard H. Kessin PDF

By Richard H. Kessin

ISBN-10: 0511525311

ISBN-13: 9780511525315

ISBN-10: 0521583640

ISBN-13: 9780521583640

The Dictyostelia are soil amoebae able to striking feats of survival, motility, chemotaxis, and improvement. often called the "social amoebae," those organisms were the topics of significant research because the Thirties. study during this zone has been instrumental in shaping common perspectives of differentiation, morphogenesis, and communique. starting with the background of Dictyostelids, this ebook considers the issues of the evolution of this multicellular organism. characterised by way of its skill to remodel from a single-celled organism into an complex assemblage of hundreds of thousands of synchronously-moving cells, each one degree of its improvement is handled in a separate bankruptcy. The specific homes of the Dictyostelid genome are conscientiously analyzed, and the tools to be had to govern genes are provided intimately. examine innovations that permit many cellphone biology difficulties to be approached in learning the organism also are offered. all through, the emphasis is on combining classical experiments with glossy molecular findings.

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

Example text

This is presumably the source of the phenomenon of meiotic drive, which promotes the selective non-Mendelian inheritance of certain chromosomes (Ardlie, 1998; Lyttle, 1993). Despite the complexity of its development, Dictyostelium does not develop from a zygote or a blastocyst ± during development most Dictyostelids assemble cells from a relatively large area, and the resulting aggregate may or may not be genetically homogeneous. As Francis and Eisenberg established, there is a pool of genetic diversity.

Perhaps D. caveatum is using such an interesting compound. There are several intriguing aspects to D. caveatum. First, it does more than eat the host cells ± it inhibits their development, even when very few cells are present. Second, how is it that in the original sample of bat guano, D. caveatum was rare? It should have spread and eaten everything else unless the prey species have defense mechanisms. How do D. caveatum amoebae get into the THE EVOLUTIONARY BIOLOGY OF DICTYOSTELIUM 35 aggregates of the prey?

The ensemble is usually called the Protista, a term which dates from Haeckel in the nineteenth century, who was the ®rst to propose that single-celled eukaryotes gave rise to multicellular organisms. The Protista are best viewed as having long, indepen- 36 DICTYOSTELIUM dent lines of descent with an ancient divergence. One question for those of us who work with Dictyostelium is: does this organism represent one of the most complex of the pre-Crown Group organisms, as the ribosomal sequence data indicate?

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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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