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Saito M, Nakayama M, Fujita K, Uchida A, Yano H, Goto S, Okazawa H, Sone M. Role of the Drosophila YATA protein in the proper subcellular localization of COPI revealed by in vivo analysis. Genes Genet Syst 2021; 95:303-314. [PMID: 33583916 DOI: 10.1266/ggs.20-00027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
yata mutants of Drosophila melanogaster exhibit phenotypes including progressive brain shrinkage, developmental abnormalities and shortened lifespan, whereas in mammals, null mutations of the yata ortholog Scyl1 result in motor neuron degeneration. yata mutation also causes defects in the anterograde intracellular trafficking of a subset of proteins including APPL, which is the Drosophila ortholog of mammalian APP, a causative molecule in Alzheimer's disease. SCYL1 binds and regulates the function of coat protein complex I (COPI) in secretory vesicles. Here, we reveal a role for the Drosophila YATA protein in the proper localization of COPI. Immunohistochemical analyses performed using confocal microscopy and structured illumination microscopy showed that YATA colocalizes with COPI and GM130, a cis-Golgi marker. Analyses using transgenically expressed YATA with a modified N-terminal sequence revealed that the N-terminal portion of YATA is required for the proper subcellular localization of YATA. Analysis using transgenically expressed YATA proteins in which the C-terminal sequence was modified revealed a function for the C-terminal portion of YATA in the subcellular localization of COPI. Notably, when YATA was mislocalized, it also caused the mislocalization of COPI, indicating that YATA plays a role in directing COPI to the proper subcellular site. Moreover, when both YATA and COPI were mislocalized, the staining pattern of GM130 revealed Golgi with abnormal elongated shapes. Thus, our in vivo data indicate that YATA plays a role in the proper subcellular localization of COPI.
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Affiliation(s)
- Maiko Saito
- Department of Biomolecular Science, Faculty of Science, Toho University
| | - Minoru Nakayama
- Department of Biomolecular Science, Faculty of Science, Toho University
| | - Kyota Fujita
- Department of Neuropathology, Medical Research Institute, Tokyo Medical and Dental University
| | - Atsuko Uchida
- Department of Neuroscience, The Ohio State University
| | | | - Satoshi Goto
- Department of Life Science, College of Science, Rikkyo University
| | - Hitoshi Okazawa
- Department of Neuropathology, Medical Research Institute, Tokyo Medical and Dental University
| | - Masaki Sone
- Department of Biomolecular Science, Faculty of Science, Toho University
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Genetic Dissection of Alzheimer's Disease Using Drosophila Models. Int J Mol Sci 2020; 21:ijms21030884. [PMID: 32019113 PMCID: PMC7037931 DOI: 10.3390/ijms21030884] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 01/26/2020] [Accepted: 01/26/2020] [Indexed: 02/06/2023] Open
Abstract
Alzheimer’s disease (AD), a main cause of dementia, is the most common neurodegenerative disease that is related to abnormal accumulation of the amyloid β (Aβ) protein. Despite decades of intensive research, the mechanisms underlying AD remain elusive, and the only available treatment remains symptomatic. Molecular understanding of the pathogenesis and progression of AD is necessary to develop disease-modifying treatment. Drosophila, as the most advanced genetic model, has been used to explore the molecular mechanisms of AD in the last few decades. Here, we introduce Drosophila AD models based on human Aβ and summarize the results of their genetic dissection. We also discuss the utility of functional genomics using the Drosophila system in the search for AD-associated molecular mechanisms in the post-genomic era.
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Arimoto E, Kawashima Y, Choi T, Unagami M, Akiyama S, Tomizawa M, Yano H, Suzuki E, Sone M. Analysis of a cellular structure observed in the compound eyes of Drosophila white; yata mutants and white mutants. Biol Open 2020; 9:bio.047043. [PMID: 31862863 PMCID: PMC6994944 DOI: 10.1242/bio.047043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We previously identified the Drosophila yata mutant, which showed phenotypes including progressive vacuolization of the white-coloured compound eye, progressive shrinkage of the brain and a shortened lifespan. The yata gene was shown to be involved in controlling intracellular trafficking of the Amyloid precursor protein-like protein, which is an orthologue of Amyloid precursor protein, which is a causative molecule of Alzheimer's disease. In this study, we examined the phenotype of the compound eye of the yata mutant using electron microscopy and confocal microscopy. We found that abnormal cellular structures that seemed to originate from bleb-like structures and contained vesicles and organelles, such as multivesicular bodies and autophagosomes, were observed in aged white; yata mutants and aged white mutants. These structures were not observed in newly eclosed flies and the presence of the structures was suppressed in flies grown under constant dark conditions after eclosion. The structures were not observed in newly eclosed red-eyed yata mutants or wild-type flies, but were observed in very aged red-eyed wild-type flies. Thus, our data suggest that the observed structures are formed as a result of changes associated with exposure to light after eclosion in white mutants, white; yata mutants and aged flies.
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Affiliation(s)
- Eri Arimoto
- Department of Biomolecular Science, Faculty of Science, Toho University, Funabashi 274-8510, Japan
| | - Yutaro Kawashima
- Department of Biomolecular Science, Faculty of Science, Toho University, Funabashi 274-8510, Japan
| | - Taein Choi
- Department of Biomolecular Science, Faculty of Science, Toho University, Funabashi 274-8510, Japan
| | - Mami Unagami
- Department of Biomolecular Science, Faculty of Science, Toho University, Funabashi 274-8510, Japan
| | - Shintaro Akiyama
- Department of Biomolecular Science, Faculty of Science, Toho University, Funabashi 274-8510, Japan
| | - Mizuki Tomizawa
- Department of Biomolecular Science, Faculty of Science, Toho University, Funabashi 274-8510, Japan
| | - Hiroyuki Yano
- Technical Section, National Institute of Genetics, Mishima 411-8540, Japan
| | - Emiko Suzuki
- Department of Gene Function and Phenomics, National Institute of Genetics, Mishima 411-8540, Japan.,Department of Genetics, SOKENDAI, Mishima 411-8540, Japan
| | - Masaki Sone
- Department of Biomolecular Science, Faculty of Science, Toho University, Funabashi 274-8510, Japan
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