A genome-wide screen for mRNAs that were polyadenylated at meiotic transitions noted that many contained an ARE, a deadenylation element, as well as a cytoplasmic polyadenylation element (CPE). One such mRNA encodes C3H-4, a protein that promotes shortening of polyA tails. The data suggest a model in which the early extension of polyadenylation through the CPE element leads to expression of C3H-4, which then acts in a negative feedback loop to deadenylate, and deactivate, those mRNAs that also contain an ARE, thereby allowing exit from metaphase.
- Eulàlia Belloc
- Raúl Méndez