Premium
Analysis of the contribution of changes in mRNA stability to the changes in steady‐state levels of cyclin mRNA in the mammalian cell cycle
Author(s) -
Penelova Anna,
Richman Larry,
Neupert Barbara,
Simanis Viesturs,
Kühn Lukas C.
Publication year - 2005
Publication title -
the febs journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.981
H-Index - 204
eISSN - 1742-4658
pISSN - 1742-464X
DOI - 10.1111/j.1742-4658.2005.04918.x
Subject(s) - cyclin a2 , cell cycle , biology , cyclin b , cyclin , cyclin a , cyclin b1 , cyclin d1 , cyclin d , messenger rna , microbiology and biotechnology , polyadenylation , cyclin e , cyclin d3 , cyclin d2 , cyclin dependent kinase 1 , cell , gene , genetics
Cyclins are the essential regulatory subunits of cyclin‐dependent protein kinases. They accumulate and disappear periodically at specific phases of the cell cycle. Here we investigated whether variations in cyclin mRNA levels in exponentially growing cells can be attributed to changes in mRNA stability. Mouse EL4 lymphoma cells and 3T3 fibroblasts were synchronized by elutriation or cell sorting. Steady‐state levels and degradation of cyclin mRNAs and some other cell cycle related mRNAs were measured at early G 1 , late G 1 , S and G 2 /M phases. In both cell lines mRNAs of cyclins C, D1 and D3 remained unchanged throughout the cell cycle. In contrast, cyclin A2 and B1 mRNAs accumulated 3.1‐ and 5.7‐fold between early G 1 and G 2 /M phase, whereas cyclin E1 mRNA decreased 1.7‐fold. Mouse cyclin A2 and B1 genes, by alternative polyadenylation, gave rise to more than one transcript. In both cases, the longer transcripts were the minor species but accumulated more strongly in G 2 /M phase. All mRNAs were rather stable with half‐lives of 1.5–2 h for cyclin E1 mRNA and 3–4 h for the others. Changes in mRNA stability accounted for the accumulation in G 2 /M phase of the short cyclin A2 and B1 mRNAs, but contributed only partially to changes in levels of the other mRNAs.