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Intimate association of 5S RNA and tRNA genes in Drosophila melanogaster.
DeLotto R
,
Louis C
,
Wormington M
,
Schedl P
.
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In this communication, we report the isolation of seven new recombinants derived from the 5S gene locus of Drosophila melanogaster. These recombinants can be divided into three different classes. There are four clones derived from within the 5S gene cluster, two which contain non-5S sequences representing the 5'flanking segment of the gene array and have a structure similar to 12D8 described by Artavanis-Tsakonas et al. (1977), and finally one (22A8) which is shown to contain a DNA segment that is located adjacent to the 3' end of the 5S gene cluster. Analysis of these recombinants supports the model in which all 5S genes of our D. melanogaster Oregon-R wild type strain are arranged in one uninterrupted cluster and are transcribed in the same direction. Interestingly, the 2.5 kb of non-5S RNA coding sequences on the recombinant derived from the 3' edge of the cluster contains at least four genes coding for tRNAs and one of these is located less than 300 bp downstream from the last 5S transcription unit. These tRNA genes are shown to be functional on the basis of the ability of 22A8 DNA to direct the synthesis of tRNA in an in vitro transcription system.
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