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HeT-A elements are non-long terminal repeat (non-LTR) retrotransposons found in head-to-tail arrays on Drosophila chromosome ends, where they form telomeres. We report that HeT-A promoter activity is located in the 3' end of the element, unlike the 5' location seen for other non-LTR retrotransposons. In HeT-A arrays the 3' sequence of one element directs transcription of its downstream neighbor. Because...
Transposable elements are abundant in the genomes of higher organisms but are usually thought to affect cells only incidentally, by transposing in or near a gene and influencing its expression. Telomeres of Drosophila chromosomes are maintained by two non-LTR retrotransposons, HeT-A and TART. These are the first transposable elements with identified roles in chromosome structure. We suggest that these...
In Drosophila, chromosome ends (telomeres) are composed of telomere-specific transposable elements (the retroposons HeT-A and TART). These elements are a bona fide part of the cellular machinery yet have many of the hallmarks of retrotransposable elements and retroviruses, raising the possibility that parasitic transposable elements and viruses might have evolved from mechanisms that the cell uses...
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