Why are there no polyA tails found on histone mRNA?
Duh, I don’t know if there’s a good reason for it. Plant histones BTW do have poly-A tails so while it’s a common feature, it’s not universal. As shown in Lewin figure 29.15, the ends of histone messages are generated by a relatively well understood process. One might imagine that histones are a very well expressed protein so you need a lot of message and that this special mechanism of termination / end-processing somehow allows an additional level of gene control…
