By Prof. Dr. Dres. h.c. Harald zur Hausen (auth.)
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Depending on the type of membrane attachment site, intermediate junctions are described as zonula adhaerens, fascia adheraens, or, punctum adhaerens. Classical cadherins (i. e. E-cadherin and N-cadherin) guarantee cell cohesion by homotypic association of their extracellular domains. They are intracellularly coupled to actin filaments via an anchor protein complex comprising catenins, vinculin, and a-actinin. cell 2 filament bundle filament bundle lunctional complex (extracellular parts of cadherins) Desmosomes are diSc-like membrane contact sites with a diameter of 0,1-0,5 micrometer, containing the two desmosomal cadherins desmocollin and desmoglein.
More than 60 genes causing tissue overgrowth are presently known in Drosophila. Their identification has occurred erratically over the last 25 years and, until recently, no systematic search for mutations giving rise to tumors has been undertaken. However, the recent development of synthetic Pelement transposons has provided new tools for gene tagging and direct molecular cloning of genes of interest. 19b 1:390 magnification and has led to the identification of 17 new tumor suppressor genes bringing to 23 the total number of known tumor suppressor genes on the second chromosome.
During these two developmental phases, Drosophila displays a very precise program of cell proliferation. Embryogenesis begins with a phase of rapid nuclear divisions. Thirteen rapid cycles of synchronous nuclear divisions occur at approximately 10-min intervals. Then the nuclei migrate to the cortex and becomes cellularized at the interphase of cycle 14. From this developmental phase the cell cycle lengthens and a few divisions occur in complex mitotic domains according to a specific temporal program which is coordinated by a complex pattern of gene expression and leads to the morphogenesis of specific tissues within the embryo.