期刊
PLANT JOURNAL
卷 91, 期 5, 页码 829-839出版社
WILEY
DOI: 10.1111/tpj.13611
关键词
alternative polyadenylation; transcription termination; poly(A) signal; CPSF100; 3 '-end formation; RNA processing; Arabidopsis
资金
- US NSF [IOS-154173]
- Chinese Ministry of Science and Technology [2016YFE0108800]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [1541737] Funding Source: National Science Foundation
CPSF100 is a core component of the cleavage and polyadenylation specificity factor (CPSF) complex for 3'-end formation of mRNA, but it still has no clear functional assignment. CPSF100 was reported to play a role in RNA silencing and promote flowering in Arabidopsis. However, the molecular mechanisms underlying these phenomena are not fully understood. Our genetics analyses indicate that plants with a hypomorphic mutant of CPSF100 (esp5) show defects in embryogenesis, reduced seed production or altered root morphology. To unravel this puzzle, we employed a poly(A) tag sequencing protocol and uncovered a different poly(A) profile in esp5. This transcriptome-wide analysis revealed alternative polyadenylation of thousands of genes, most of which result in transcriptional read-through in protein-coding genes. AtCPSF100 also affects poly(A) signal recognition on the far-upstream elements; in particular it prefers less U-rich sequences. Importantly, AtCPSF100 was found to exert its functions through the change of poly(A) sites on genes encoding binding proteins, such as nucleotide-binding, RNA-binding and poly(U)-binding proteins. In addition, through its interaction with RNA Polymerase II C-terminal domain (CTD) and affecting the expression level of CTD phosphatase-like 3 (CPL3), AtCPSF100 is shown to potentially ensure transcriptional termination by dephosphorylation of Ser2 on the CTD. These data suggest a key role for CPSF100 in locating poly (A) sites and affecting transcription termination.
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