Alternative splicing of the pyruvate kinase M (PKM) pre-mRNA, resulting in the exclusion of either exon 9 or 10, requires a small set of splicing factors, hnRNPA1, hnRNPA2 and PTB. A new study reveals that these general splicing factors function through a concentration-dependent mechanism, coupled with nonsense-mediated decay, to determine the outcome of PKM pre-mRNA splicing.
- Mo Chen
- Charles J David
- James L Manley