Molecular characteristics of the heterochromatic I elements from a reactive strain ofDrosophila melanogaster (original) (raw)

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Summary

There are two categories of strains in_Drosophila melanogaster_ with respect to the I-R system of hybrid dysgenesis. The inducer strains contain particular transposable elements named I factors. They are not present in the strains of the other category called reactive (R) strains. Defective I elements are present in the pericentromeric regions of both categories of strains. This last subfamily of I sequences has not yet been described in detail and little is known about its origin. In this paper, we report that the defective I elements display an average of 94% of sequence identity with each other and with the transposable I factor. The results suggest that they cannot be the progenitors of the present day I factors, but that each of these two subfamilies started to evolve independently several million years ago. Furthermore, the sequence comparison of these I elements with an active I factor from_Drosophila teissieri_ provides useful information about when the deleted I elements became immobilized.

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Authors and Affiliations

1. Laboratoire de Génétique, Université Blaise Pascal, 63177, Aubière cédex, France
   C. Vaury, A. Pelisson & A. Lenoir
2. Centre de Recherche d'Antibes, INRA, BP2078, 06606, Antibes cédex, France
   P. Abad
3. Centre de Génétique Moléculaire, CNRS, 91190, Gif-sur-Yvette, France
   A. Bucheton

Authors

1. C. Vaury
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2. P. Abad
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3. A. Pelisson
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4. A. Lenoir
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5. A. Bucheton
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Vaury, C., Abad, P., Pelisson, A. et al. Molecular characteristics of the heterochromatic I elements from a reactive strain of_Drosophila melanogaster_.J Mol Evol 31, 424–431 (1990). https://doi.org/10.1007/BF02106056

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• Received: 11 January 1990
• Revised: 20 May 1990
• Issue Date: November 1990
• DOI: https://doi.org/10.1007/BF02106056

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