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Pham TLA, Binh TD, Liu G, Nguyen TQC, Nguyen YDH, Sahashi R, Men TT, Kamei K. Role of Serotonin Transporter in Eye Development of Drosophila melanogaster. Int J Mol Sci 2020; 21:ijms21114086. [PMID: 32521639 PMCID: PMC7312876 DOI: 10.3390/ijms21114086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/26/2020] [Accepted: 06/05/2020] [Indexed: 11/30/2022] Open
Abstract
Serotonin transporter (SerT) in the brain is an important neurotransmitter transporter involved in mental health. However, its role in peripheral organs is poorly understood. In this study, we investigated the function of SerT in the development of the compound eye in Drosophila melanogaster. We found that SerT knockdown led to excessive cell death and an increased number of cells in S-phase in the posterior eye imaginal disc. Furthermore, the knockdown of SerT in the eye disc suppressed the activation of Akt, and the introduction of PI3K effectively rescued this phenotype. These results suggested that SerT plays a role in the healthy eye development of D.melanogaster by controlling cell death through the regulation of the PI3K/Akt pathway.
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Affiliation(s)
- Tuan L. A. Pham
- Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan; (T.L.A.P.); (T.D.B.); (G.L.); (T.Q.C.N.); (Y.D.H.N.); (R.S.)
| | - Tran Duy Binh
- Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan; (T.L.A.P.); (T.D.B.); (G.L.); (T.Q.C.N.); (Y.D.H.N.); (R.S.)
| | - Guanchen Liu
- Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan; (T.L.A.P.); (T.D.B.); (G.L.); (T.Q.C.N.); (Y.D.H.N.); (R.S.)
| | - Thanh Q. C. Nguyen
- Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan; (T.L.A.P.); (T.D.B.); (G.L.); (T.Q.C.N.); (Y.D.H.N.); (R.S.)
| | - Yen D. H. Nguyen
- Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan; (T.L.A.P.); (T.D.B.); (G.L.); (T.Q.C.N.); (Y.D.H.N.); (R.S.)
| | - Ritsuko Sahashi
- Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan; (T.L.A.P.); (T.D.B.); (G.L.); (T.Q.C.N.); (Y.D.H.N.); (R.S.)
| | - Tran Thanh Men
- Department of Biology, Cantho University, Cantho 900000, Vietnam;
| | - Kaeko Kamei
- Department of Functional Chemistry, Kyoto Institute of Technology, Kyoto 606-8585, Japan; (T.L.A.P.); (T.D.B.); (G.L.); (T.Q.C.N.); (Y.D.H.N.); (R.S.)
- Correspondence:
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Sahashi R, Crevel G, Pasko J, Suyari O, Nagai R, Saura MM, Yamaguchi M, Cotterill S. DNA polymerase α interacts with PrSet7 and mediates H4K20 monomethylation in Drosophila. J Cell Sci 2014; 127:3066-78. [PMID: 24806961 DOI: 10.1242/jcs.144501] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
In human cells, appropriate monomethylation of histone H4 lysine 20 by PrSet7 (also known as SET8 and SETD7) is important for the correct transcription of specific genes and timely progression through the cell cycle. Over-methylation appears to be prevented through the interaction of PrSet7 with proliferating cell nuclear antigen (PCNA), which targets PrSet7 for destruction through the pathway mediated by CRL4(C) (dt2) (the cullin ring finger ligase-4 complex containing Cdt2). However, the factors involved in positive regulation of PrSet7 histone methylation remain undefined. Here, we present biochemical and genetic evidence for a previously undocumented interaction between Drosophila PrSet7 (dPrSet7) and DNA polymerase α in Drosophila. Depletion of the polymerase reduces H4K20 monomethylation suggesting that it is required for dPrSet7 histone methylation activity. We also show that the interaction between PCNA and PrSet7 is conserved in Drosophila, but is only detectable in chromatin fractions. Consistent with this, S2 cells show a significant loss of chromatin-bound dPrSet7 protein as S phase progresses. Based on these data we suggest that interaction with the DNA polymerase represents an important route for stimulation of PrSet7 histone methylase activity that is mediated by allowing loading of dPrSet7 onto chromatin or its subsequent activation.
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Affiliation(s)
- Ritsuko Sahashi
- Department Basic Medical Sciences, St Georges University London, Cranmer Terrace, London SW17 0RE, UK Department of Applied Biology, Insect Biomedical Research Center, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Gilles Crevel
- Department Basic Medical Sciences, St Georges University London, Cranmer Terrace, London SW17 0RE, UK
| | - Jaroslaw Pasko
- Department Basic Medical Sciences, St Georges University London, Cranmer Terrace, London SW17 0RE, UK
| | - Osamu Suyari
- Department of Applied Biology, Insect Biomedical Research Center, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Rika Nagai
- Department of Applied Biology, Insect Biomedical Research Center, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Mario Martinez Saura
- Department Basic Medical Sciences, St Georges University London, Cranmer Terrace, London SW17 0RE, UK
| | - Masamitsu Yamaguchi
- Department of Applied Biology, Insect Biomedical Research Center, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Sue Cotterill
- Department Basic Medical Sciences, St Georges University London, Cranmer Terrace, London SW17 0RE, UK
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Sahashi R, Matsuda R, Suyari O, Kawai M, Yoshida H, Cotterill S, Yamaguchi M. Functional analysis of Drosophila DNA polymerase ε p58 subunit. Am J Cancer Res 2013; 3:478-489. [PMID: 24224125 PMCID: PMC3816967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Accepted: 10/20/2013] [Indexed: 06/02/2023] Open
Abstract
DNA polymerase ε (polε) plays a central role in DNA replication in eukaryotic cells, and has been suggested to the main synthetic polymerase on the leading strand. It is a hetero-tetrameric enzyme, comprising a large catalytic subunit (the A subunit ~250 kDa), a B subunit of ~60 kDa in most species (~80 kDa in budding yeast) and two smaller subunits (each ~20 kDa). In Drosophila, two subunits of polε (dpolε) have been identified. One is the 255 kDa catalytic subunit (dpolεp255), and the other is the 58 kDa subunit (dpolεp58). The functions of the B subunit have been mainly studied in budding yeast and mammalian cell culture, few studies have been performed in the context of an intact multicellular organism and therefore its functions in this context remain poorly understood. To address this we examined the in vivo role of dpolεp58 in Drosophila. A homozygous dpolεp58 mutant is pupal lethal, and the imaginal discs are less developed in the third instar larvae. In the eye discs of this mutant S phases, as measured by BrdU incorporation assays, were significantly reduced. In addition staining with an anti-phospho histone H3 (PH3) antibody, (a marker of M phase), was increased in the posterior region of eye discs, where usually cells stop replicating and start differentiation. These results indicate that dpolεp58 is essential for Drosophila development and plays an important role in progression of S phase in mitotic cell cycles. We also observed that the size of nuclei in salivary gland cells were decreased in dpolεp58 mutant, indicating that dpolεp58 also plays a role in endoreplication. Furthermore we detect a putative functional interaction between dpolε and ORC2 in discs suggesting that polε plays a role in the initiation of DNA replication in Drosophila.
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Affiliation(s)
- Ritsuko Sahashi
- Department of Applied Biology, Kyoto Institute of TechnologySakyo-ku, Kyoto 606-8585, Japan
- Insect Biomedical Research Center, Kyoto Institute of TechnologySakyo-ku, Kyoto 606-8585, Japan
| | - Risa Matsuda
- Department of Applied Biology, Kyoto Institute of TechnologySakyo-ku, Kyoto 606-8585, Japan
- Insect Biomedical Research Center, Kyoto Institute of TechnologySakyo-ku, Kyoto 606-8585, Japan
- Current address: Environmental Research Laboratory of Public Health, Kankyo Eisei Yakuhin Co. Ltd.3-6-2 Hikaridai, Seika-cho, Soraku-gun, Kyoto 619-0237, Japan
| | - Osamu Suyari
- Department of Applied Biology, Kyoto Institute of TechnologySakyo-ku, Kyoto 606-8585, Japan
- Insect Biomedical Research Center, Kyoto Institute of TechnologySakyo-ku, Kyoto 606-8585, Japan
| | - Mieko Kawai
- Department of Applied Biology, Kyoto Institute of TechnologySakyo-ku, Kyoto 606-8585, Japan
| | - Hideki Yoshida
- Department of Applied Biology, Kyoto Institute of TechnologySakyo-ku, Kyoto 606-8585, Japan
- Insect Biomedical Research Center, Kyoto Institute of TechnologySakyo-ku, Kyoto 606-8585, Japan
| | - Sue Cotterill
- Department Basic Medical Sciences, St Georges University LondonCranmer Terrace, London SW17 0RE, UK
| | - Masamitsu Yamaguchi
- Department of Applied Biology, Kyoto Institute of TechnologySakyo-ku, Kyoto 606-8585, Japan
- Insect Biomedical Research Center, Kyoto Institute of TechnologySakyo-ku, Kyoto 606-8585, Japan
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