Tchurikov, N.A., Naumova, A.K., Zelentsova, E.S., Georgiev, G.P. (1982). A cloned unique gene of Drosophila melanogaster contains a repetitive 3' exon whose sequence is present at the 3' ends of many different mRNAs.  Cell 28(2): 365--373.

FBrf0037606

Research paper

We have started a cloned genomic DNA fragment approximately 7 kb long (denoted as H55) from the 7B3-4 region in the X chromosome of Drosophila melanogaster. The major part of the fragment is a single-copy sequence. It directs the synthesis of mRNA that makes up approximately 0.1% of the cytoplasmic poly(A)+ RNA from Drosophila embryos. The H55 gene is split by an intervening sequence, yielding a large single-copy exon and a small repetitive 3' exon represented by hundreds of copies in the genome. This repetitive sequence ("suffix") is also present at the 3' ends of approximately 2% of all cytoplasmic poly(A) chains.