INTRAGENOMIC DISTRIBUTION AND STABILITY OF TRANSPOSABLE ELEMENTS IN EUCHROMATIN AND HETEROCHROMATIN OF DROSOPHILA-MELANOGASTER - ELEMENTS WITH INVERTED REPEATS BARI-1, HOBO, AND POGO

The elements of the Bari 1, hobo, and pogo transposon families that ar e located in euchromatin, heterochromatin, and on the Y chromosome hav e been identified, and their stability has been assessed by Southern b lot analysis. The fraction of heterochromatic elements appears to be d istinctive of all transposon families tested, except for Bari 1. Evide nce for instability of heterochromatic elements is described. The anal ysis of unstable elements in different Drosophila stocks suggests that the host genome contributes to the stability/instability of transposo n families.