By Richard H. Kessin
The Dictyostelia are soil amoebae in a position to remarkable feats of survival, motility, chemotaxis, and improvement. referred to as the "social amoebae," those organisms were the themes of significant learn because the Thirties. study during this zone has been instrumental in shaping normal perspectives of differentiation, morphogenesis, and conversation. starting with the historical past of Dictyostelids, this publication considers the issues of the evolution of this multicellular organism. characterised via its skill to remodel from a single-celled organism into an problematic assemblage of hundreds of thousands of synchronously-moving cells, every one level of its improvement is handled in a separate bankruptcy. The particular homes of the Dictyostelid genome are conscientiously analyzed, and the equipment on hand to govern genes are provided intimately. learn options that let many cellphone biology difficulties to be approached in learning the organism also are provided. all through, the emphasis is on combining classical experiments with glossy molecular findings.
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Additional resources for Dictyostelium: Evolution, Cell Biology, and the Development of Multicellularity (Developmental and Cell Biology Series)
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? Are they universally chemotactic, capable of aggregation toward cAMP, glorin and other chemotactically active molecules, or are they tracking a common molecule? Third, the self±non-self recognition mechanism has broken down. Normally, the various species of the social amoebae do not ingest one another.
Mucoroides. Starting with an uncloned population, Filosa found individual colonies with variant morphologies. One, which formed slugs but no fruiting bodies, preferentially made spores when mixed with wild-type cells. The second observation of parasitism was by Buss (1982), also with D. mucoroides. Buss found a single soil sample which, when plated clonally, gave rise to normal colonies and colonies that only formed spores. The latter, in chimeras with the fruiting strain, could suppress the wild-type if their initial concentration was high enough.
As we will see in a later chapter, cellulose biosynthesis and extrusion is a complicated process and it is not likely that it evolved twice. 3 Giant cell of NC4 and V12. A giant cell, formed from the fusion of starving amoebae of two mating types, attracts and then engulfs peripheral cells. One mating type has been marked with green ¯uorescent protein (GFP). Some cells have been ingested and others are attached to phagocytic cups in the process of ingestion. Ingested cells are called endocytes.