Abstract
Change of hybrid dysgenesis potentials in P-M system of Drosophila melanogaster — In the P-M system of hybrid dysgenesis, three types of Drosophila melanogaster strains have been described in relation to hybrid gonadal sterility: P, Q and M. When M strain females were mated with P strain males, the P factors resulted in variable level of sterility in their progeny. The Q strain had no significant potential for sterility in any hybrid strain combination. To observe the dynamics of chromosomal contamination, due to the P transposable elements in different genetic context, mixed populations of these three types of strains were set up and monitored for their gonadal sterility potential during at least 30 generations.
A first set of 16 experimental populations was set up; each of these was initiated with a mixture of 50% of individuals from the Harwich strain (a strong P strain) and 50% of individuals from a M or Q strain collected in natural populations. The M activity levels of these strains corresponded to a range from 100% to 0%. For all of these populations, the M activity potential disappeared during the five first generations. However, the P activity potential reached an equilibrium level positively correlated with the M activity potential level introduced at the beginning. It is proposed that the force of invasion of the P type by chromosomal contamination through the transposition of the P elements is dependent on the copy number of P sequences present on the chromosome of the M′ strain in competition.
A second set of 18 experimental populations was set up with a mixture of P, M or Q strains collected in France between 1965 and 1982 (this period probably corresponds to the invasion of the P elements in France). After 30 generations, all of these populations (except one) had lost all dysgenic sterility potentiality and seemed to be of the Q type. Taking into account the results obtained from the two sets of experimental populations, the temporal and geographical distribution of P elements in the world could be explained by a progressive diffusion of autonomous P elements, from America with an accompanying decrease of their ability to transpose.
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Ce travail a été réalisé dans le cadre de l'A.T.P. Biologie des populations et de l'UA 693 du C.N.R.S.
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Anxolabéhère, D., Nouaud, D., Périquet, G. et al. Evolution des potentialités dysgénésiques du système P-M dans des populations expérimentales mixtes P, Q, M et M′ de Drosophila melanogaster . Genetica 69, 81–95 (1986). https://doi.org/10.1007/BF00115127
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DOI: https://doi.org/10.1007/BF00115127