Chromosoma

, Volume 98, Issue 3, pp 215–224

The β heterochromatic sequences flanking the I elements are themselves defective transposable elements

  • Chantal Vaury
  • Alain Bucheton
  • Alain Pelisson
Article

DOI: 10.1007/BF00329686

Cite this article as:
Vaury, C., Bucheton, A. & Pelisson, A. Chromosoma (1989) 98: 215. doi:10.1007/BF00329686

Abstract

Phylogenetic studies suggest that mobile element families are unstable components of the Drosophila genome. Two examples of immobilization of a transposable element family are presented here: as judged by their constant genomic organization among unrelated strains, the F and I element families have been respectively immobilized for a long time in D. simulans and in the reactive D. melanogaster strains (these are the laboratory strains which escaped the recent I invasion of D. melanogaster natural populations). All the elements of these defective families are located in the β heterochromatic portion of the genome. Moreover, most if not all of the β heterochromatic sequences into which the defective I elements are embedded are themselves non-mobile members of various nomadic families such as mdg 4, 297, 1731, F and Doc. These results are discussed with special emphasis on the possible nomadic origin of β heterochromatin components and on the mechanisms of evolutionary turnover of the transposable element families.

Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Chantal Vaury
    • 1
  • Alain Bucheton
    • 2
  • Alain Pelisson
    • 1
  1. 1.Laboratoire de GénétiqueUniversité Blaise PascalAubière CédexFrance
  2. 2.Centre de Génétique Moléculaire, CNRSGif-sur-YvetteFrance