Models of Repression of Transposition in P-M Hybrid Dysgenesis by P Cytotype and by Zygotically Encoded Repressor Proteins |
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Authors: | JFY. Brookfield |
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Affiliation: | Department of Genetics, University of Nottingham, Queens Medical Centre, England. |
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Abstract: | By analytical theory and computer simulation the expected evolutionary dynamics of P transposable element spread in an infinite population are investigated. The analysis is based on the assumption that, unlike transposable elements which move via RNA intermediates, the harmful effects of P elements arise primarily in the act of transposition, and that this causes their evolutionary dynamics to be unusual. It is suggested that a situation of transposition-selection balance will be superceded by the buildup of a cytoplasmically inherited repression or by the elimination of active transposase-encoding elements from the chromosomes, a process which may be accompanied by the evolution of elements which encode proteins which repress transposition. |
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