APA is pervasive between
tissues. We have followed 3’UTR length changes in genes with only one 3’UTR isoform between intestine, pharynx and body muscle tissues. Length comparison between the same genes expressed between (A) intestine and pharynx, (B) pharynx and body muscle and (C) intestine and body muscle tissues. Shaded circles represent those genes expressed with proximal 3’UTR isoforms in the intestine (black), pharynx (red) or body muscle (blue), where the distal isoform was detected in the other corresponding tissue in each graph. Genes with 3’UTR isoforms that were the same length between each tissue are represented in grey as noted in the legend. (D) Distribution of unique 3’UTR isoforms for genes detected in all three tissues. The majority of these 3’UTRs are common in all three tissues (blue). Genes with a 3’UTR isoform in the intestine distinct from muscle tissues are also abundant (muscle shared). Only 2% of these genes express different 3’UTR isoforms between all three tissues (distinct).