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Genetics, Vol 128, 471-486, Copyright © 1991
INVESTIGATIONS |
Models of Repression of Transposition in P-M Hybrid Dysgenesis by P Cytotype and by Zygotically Encoded Repressor Proteins
JFY. Brookfield
Department of Genetics, University of Nottingham, Queens Medical Centre, Nottingham NG7 2UH, England
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 It is suggested that a situation of transposition-selection balance will be superceded by the buildup of a cytoplasmically inherited repression or by the elimination of active transposase-encoding elements from the chromosomes, a process which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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