Transcription of Dictyostelium discoideum transposable element DIRS-1.
DIRS-1 is a Dictyostelium discoideum transposable element that contains heat shock promoter sequences in the inverted terminal repeats. We showed that transcription of a 4.5-kilobase polyadenylated RNA initiates at a discrete site within the left-terminal repeat of DIRS-1, downstream from heat shock promoter and TATA box sequences. This RNA represents a full-length transcript of DIRS-1. We describe a cDNA clone that contains the 4.1 kilobases of internal sequence of DIRS-1, a cDNA clone that spans the junction between the internal sequences and the right-terminal repeat, and a cDNA clone that appears to have been transcribed from a rearranged genomic copy of DIRS-1. A second DIRS-1 RNA, named E1, is transcribed on the opposite strand of DIRS-1 from the 4.5-kilobase RNA and is under control of the heat shock promoter in the right-terminal repeat. E1 transcription initiates at multiple positions both within and downstream from the right-terminal repeat. The same transcriptional initiation sites are used during normal development and during heat shock, suggesting that in all cases DIRS-1 transcription is regulated by the heat shock promoters contained within the two terminal repeats.
D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D004251:DNA Transposable Elements; D004271:DNA, Fungal / Q000235:genetics; D004023:Dictyostelium / Q000235:genetics*; D006358:Hot Temperature; D009876:Operon; D012091:Repetitive Sequences, Nucleic Acid; D014158:Transcription, Genetic
D004251:DNA Transposable Elements; D004271:DNA, Fungal; D004247:DNA