Copy number and distribution of P and I mobile elements in Drosophila melanogaster populations |
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Authors: | Stéphane Ronsseray Monique Lehmann Dominique Anxolabéhère |
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Affiliation: | (1) Laboratoire de Génétique des Populations, Université Paris 6, Tour 42, 4 Place Jussieu, F-75005 Paris, France |
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Abstract: | The distribution of the number of copies of P and I transposable elements per genome was investigated by in situ hybridization for a large set of Drosophila melanogaster strains. These included the P, Q and M types of the P-M system of hybrid dysgenesis. P element copy number varied widely (range 5–59). P and Q strains had around 40 copies whereas M strains generally had lower numbers (between 5 and 35) with one extreme value (52). The copy number of I elements appeared to be precisely regulated, as no strains were found outside the 15±5 range. The number of copies of the two families were independent. An excess of P copies on the X chromosome compared with the autosomes was found for the P and Q strains, but not for M strains. Among X-inserted P sites, a very high frequency of occupation was found at the tip of the X chromosome (cytological site 1A), especially for P and Q strains. The possible regulatory role in the P-M system of X-inserted P sites is discussed. |
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