Clusters containing different mobile dispersed genes in the genome of Drosophila melanogaster

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Abstract
Ten clones containing the actively transcribed mobile dispersed gene Dm255 and its flanking sequences were selected from the HindIII bank of the Drosophila melanogaster genome. The Dm225 sequences present in these clones were identical while the flanking sequences were different in all of the clones analysed. Four of them contained, in addition to Dm225, other DNA sequences binding high amounts of cytoplasmic poly(A) + RNA. The properties of these new genes are similar to those of Dm255: they are also actively transcribed, multiple in copies, scattered throughout the genome, and located at varying genome sites which also were scattered throughout the whole genome of D. melanogaster. Thus, different mobile dispersed genes often appear as closely apposing units forming gene clusters in the genome.