Dual roles of the nuclear cap-binding complex and SERRATE in pre-mRNA splicing and microRNA processing in Arabidopsis thaliana
The processing of Arabidopsis thaliana microRNAs (miRNAs) from longer primary transcripts (pri-miRNAs) requires the activity of several proteins, including DICER-LIKE1 (DCL1), the double-stranded RNA-binding protein HYPONASTIC LEAVES1 (HYL1), and the zinc finger protein SERRATE (SE). It has been not...
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
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[June 24, 2008]
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| In: |
Proceedings of the National Academy of Sciences of the United States of America
Year: 2008, Jahrgang: 105, Heft: 25, Pages: 8795-8800 |
| ISSN: | 1091-6490 |
| DOI: | 10.1073/pnas.0802493105 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1073/pnas.0802493105 Verlag, kostenfrei, Volltext: http://www.pnas.org/content/105/25/8795 
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| Verfasserangaben: | Sascha Laubinger, Timo Sachsenberg, Georg Zeller, Wolfgang Busch, Jan U. Lohmann, Gunnar Rätsch, and Detlef Weigel |
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| 245 | 1 | 0 | |a Dual roles of the nuclear cap-binding complex and SERRATE in pre-mRNA splicing and microRNA processing in Arabidopsis thaliana |c Sascha Laubinger, Timo Sachsenberg, Georg Zeller, Wolfgang Busch, Jan U. Lohmann, Gunnar Rätsch, and Detlef Weigel |
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| 520 | |a The processing of Arabidopsis thaliana microRNAs (miRNAs) from longer primary transcripts (pri-miRNAs) requires the activity of several proteins, including DICER-LIKE1 (DCL1), the double-stranded RNA-binding protein HYPONASTIC LEAVES1 (HYL1), and the zinc finger protein SERRATE (SE). It has been noted before that the morphological appearance of weak se mutants is reminiscent of plants with mutations in ABH1/CBP80 and CBP20, which encode the two subunits of the nuclear cap-binding complex. We report that, like SE, the cap-binding complex is necessary for proper processing of pri-miRNAs. Inactivation of either ABH1/CBP80 or CBP20 results in decreased levels of mature miRNAs accompanied by apparent stabilization of pri-miRNAs. Whole-genome tiling array analyses reveal that se, abh1/cbp80, and cbp20 mutants also share similar splicing defects, leading to the accumulation of many partially spliced transcripts. This is unlikely to be an indirect consequence of improper miRNA processing or other mRNA turnover pathways, because introns retained in se, abh1/cbp80, and cbp20 mutants are not affected by mutations in other genes required for miRNA processing or for nonsense-mediated mRNA decay. Taken together, our results uncover dual roles in splicing and miRNA processing that distinguish SE and the cap-binding complex from specialized miRNA processing factors such as DCL1 and HYL1. | ||
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