Abstract
The potential to genetically dissect tumorigenesis provides the major reason to study this process in the fruit flyDrosophila. Over the last 30 years genetic analysis has identified some 55 genes in which recessive mutations cause the appearance of specific tumours during development in tissues such as the imaginal discs, the brain hemispheres, the hematopoietic organs or the gonads, Since the normal allele acts dominantly over the mutated allele, these genes are designated as tumour suppressor genes. The estimate of the number of genes that can be mutated to tumour formation may be, however, much higher ranging between I00 to 200. The challenge before this field is how best to identify these genes and elucidate their function. Current molecular procedures, such as mutagenesis mediated by P-element transposon, provide new ways for tagging any gene of interest inDrosophila and thus for cloning it rapidly. Function of the gene product can be inferred by comparing its amino acid sequence with sequences of proteins with known function or can be determined by histochemical and biochemical investigations.
Progress in the understanding of tumour suppression inDrosophila is most advanced in the case of genes regulating cell growth in imaginal discs. The imaginal discs are small groups of cells displaying a strong apical-basal polarity and form folded sacs of epithelia which grow throughout the larval life and give rise to the adult tegument during metamorphosis. Tumour suppressor genes regulating cell growth of imaginal discs, such as thelethal(2)giant larvae (l(2)g1),lethal(1)discs large-1 andexpanded genes, were found to encode proteins localized in domains of cell to cell contact on the plasma membrane and were thus thought to maintain cell adhesion. However, recent studies of l(2)gl have revealed that the l(2)gl protein is a component of the normal cytoskeleton which can participates to the cytoskeletal matrix underlaying the plasma membrane. These findings indicate that the changes in cell shape and the loss of apical-basal polarity in imaginal disc cells result primarily from alterations in the cytoskeleton structure. Furthermore the neoplastic growth of the mutated cells may be caused by the disorganization of an intracellular communication system that ultimately controls cell proliferation and/or cell differentiation.
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Mechler, B.M. When the control is lacking—the role of tumour suppressor genes in cancer development. J Biosci 19, 537–556 (1994). https://doi.org/10.1007/BF02703201
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DOI: https://doi.org/10.1007/BF02703201