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Mamon LA, Ginanova VR, Kliver SF, Yakimova AO, Atsapkina AA, Golubkova EV. RNA-binding proteins of the NXF (nuclear export factor) family and their connection with the cytoskeleton. Cytoskeleton (Hoboken) 2017; 74:161-169. [PMID: 28296067 DOI: 10.1002/cm.21362] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 03/04/2017] [Accepted: 03/08/2017] [Indexed: 02/05/2023]
Abstract
The mutual relationship between mRNA and the cytoskeleton can be seen from two points of view. On the one hand, the cytoskeleton is necessary for mRNA trafficking and anchoring to subcellular domains. On the other hand, cytoskeletal growth and rearrangement require the translation of mRNAs that are connected to the cytoskeleton. β-actin mRNA localization may influence dynamic changes in the actin cytoskeleton. In the cytoplasm, long-lived mRNAs exist in the form of RNP (ribonucleoprotein) complexes, where they interact with RNA-binding proteins, including NXF (Nuclear eXport Factor). Dm NXF1 is an evolutionarily conserved protein in Drosophila melanogaster that has orthologs in different animals. The universal function of nxf1 genes is the nuclear export of different mRNAs in various organisms. In this mini-review, we briefly discuss the evidence demonstrating that Dm NXF1 fulfils not only universal but also specialized cytoplasmic functions. This protein is detected not only in the nucleus but also in the cytoplasm. It is a component of neuronal granules. Dm NXF1 marks nuclear division spindles during early embryogenesis and the dense body on one side of the elongated spermatid nuclei. The characteristic features of sbr mutants (sbr10 and sbr5 ) are impairment of chromosome segregation and spindle formation anomalies during female meiosis. sbr12 mutant sterile males with immobile spermatozoa exhibit disturbances in the axoneme, mitochondrial derivatives and cytokinesis. These data allow us to propose that the Dm NXF1 proteins transport certain mRNAs in neurites and interact with localized mRNAs that are necessary for dynamic changes of the cytoskeleton.
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Affiliation(s)
- L A Mamon
- Department of Genetics and Biotechnology, Faculty of Biology, St Petersburg State University Universitetskaya nab. 7-9, Saint-Petersburg, 199034, Russia
| | - V R Ginanova
- Department of Genetics and Biotechnology, Faculty of Biology, St Petersburg State University Universitetskaya nab. 7-9, Saint-Petersburg, 199034, Russia
| | - S F Kliver
- Department of Genetics and Biotechnology, Faculty of Biology, St Petersburg State University Universitetskaya nab. 7-9, Saint-Petersburg, 199034, Russia
| | - A O Yakimova
- Department of Genetics and Biotechnology, Faculty of Biology, St Petersburg State University Universitetskaya nab. 7-9, Saint-Petersburg, 199034, Russia
| | - A A Atsapkina
- Department of Genetics and Biotechnology, Faculty of Biology, St Petersburg State University Universitetskaya nab. 7-9, Saint-Petersburg, 199034, Russia
| | - E V Golubkova
- Department of Genetics and Biotechnology, Faculty of Biology, St Petersburg State University Universitetskaya nab. 7-9, Saint-Petersburg, 199034, Russia
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Abramczuk MK, Burkard TR, Rolland V, Steinmann V, Duchek P, Jiang Y, Wissel S, Reichert H, Knoblich JA. The splicing co-factor Barricade/Tat-SF1, is required for cell cycle and lineage progression in Drosophila neural stem cells. Development 2017; 144:3932-3945. [DOI: 10.1242/dev.152199] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 09/11/2017] [Indexed: 12/25/2022]
Abstract
Stem cells need to balance self-renewal and differentiation for correct tissue development and homeostasis. Defects in this balance can lead to developmental defects or tumor formation. In recent years, mRNA splicing has emerged as one important mechanism regulating cell fate decisions. Here we address the role of the evolutionary conserved splicing co-factor Barricade (Barc)/Tat-SF1/CUS2 in Drosophila neural stem cell (neuroblast) lineage formation. We show that Barc is required for the generation of neurons during Drosophila brain development by ensuring correct neural progenitor proliferation and differentiation. Barc associates with components of the U2 small nuclear ribonucleic proteins (snRNP), and its depletion causes alternative splicing in form of intron retention in a subset of genes. Using bioinformatics analysis and a cell culture based splicing assay, we found that Barc-dependent introns share three major traits: they are short, GC rich and have weak 3' splice sites. Our results show that Barc, together with the U2snRNP, plays an important role in regulating neural stem cell lineage progression during brain development and facilitates correct splicing of a subset of introns.
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Affiliation(s)
- Monika K. Abramczuk
- Institute of Molecular Biotechnology of the Austrian Academy of Science (IMBA), Dr. Bohr-Gasse 3, Vienna, Austria
| | - Thomas R. Burkard
- Institute of Molecular Biotechnology of the Austrian Academy of Science (IMBA), Dr. Bohr-Gasse 3, Vienna, Austria
- Research Institute of Molecular Pathology (IMP), Campus-Vienna-Biocenter 1, 1030 Vienna, Austria
| | - Vivien Rolland
- Institute of Molecular Biotechnology of the Austrian Academy of Science (IMBA), Dr. Bohr-Gasse 3, Vienna, Austria
- Current address: Commonwealth Scientific and Industrial Research Organisation (CSIRO), Agriculture and Food, Canberra, ACT 2601, Australia
| | - Victoria Steinmann
- Institute of Molecular Biotechnology of the Austrian Academy of Science (IMBA), Dr. Bohr-Gasse 3, Vienna, Austria
| | - Peter Duchek
- Institute of Molecular Biotechnology of the Austrian Academy of Science (IMBA), Dr. Bohr-Gasse 3, Vienna, Austria
| | - Yanrui Jiang
- Biozentrum, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland
- Current address: D-BSSE ETH Zürich, Mattenstrasse 26, CH-4058 Basel, Switzerland
| | - Sebastian Wissel
- Institute of Molecular Biotechnology of the Austrian Academy of Science (IMBA), Dr. Bohr-Gasse 3, Vienna, Austria
| | - Heinrich Reichert
- Biozentrum, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland
| | - Juergen A. Knoblich
- Institute of Molecular Biotechnology of the Austrian Academy of Science (IMBA), Dr. Bohr-Gasse 3, Vienna, Austria
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