Alternative 5C actin transcripts are localized in different patterns during Drosophila embryogenesis

Developmental Biology
T C BurnS L Tobin

Abstract

The Drosophila actin gene located at cytogenetic position 5C forms at least 9 and perhaps as many as 15 different transcripts with the use of alternative transcriptional start points, differential splicing, and different regions of cleavage/polyadenylation. Each transcript contains one of two alternative 5' exons. We have subcloned unique recombinant DNA probes specific for each separate 5' exon and for three polyadenylation regions into vectors containing T3 and T7 promoters. Single stranded, tritium-labeled RNA probes were generated in vitro from these constructs. These probes have been hybridized in situ to RNA transcripts present in tissue sections from Drosophila embryos. The results of these experiments indicate that transcripts homologous to the two separate 5' exon-specific probes accumulate in strikingly different patterns during Drosophila development. Thus the incorporation of a particular 5' exon into a transcript is correlated with tissue-specific localization of that transcript. In contrast, probes for each of the three polyadenylation regions do not detect any tissue-specific localization of transcripts.

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