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During Drosophila gastrula ion, Ga12 (Cta)mediated signaling \u003cbr /\u003econtrols the ventral cellular movements of epithelia. Here, I show that G Protein \u003cbr /\u003esignaling also regulates the organization of cortical actin cytoskeleton underlining \u003cbr /\u003eplasma membrane in the epithelial cells. Multiple Gα subfamilies, Gα12 and \u003cbr /\u003eGαi, are involved in the actin organization, but a known ligand of Gα12, Fog, is \u003cbr /\u003enot required. When rie-8, which is required for plasma membrane-targeting of \u003cbr /\u003ewhole G proteins and their signaling activity, is mutated, the cell surfaces become \u003cbr /\u003eunstable and show blebs, and entire cellular movements in gastrulation are \u003cbr /\u003edelayed. The mutants for the common cofactors of the Gα\u0027s, GB13F and Gγ1, \u003cbr /\u003eshow the similar phenotypes. Ventral cells also showed blebs like the ric-8 \u003cbr /\u003emutant when the cells are treated with inhibitors of actin polymerization. The \u003cbr /\u003edisruption of cortical actin in the mutants for G proteins is seen in all epithelial \u003cbr /\u003ecells, but the disorganization of the surface occurs only in the moving ventral cells. \u003cbr /\u003eThis suggests that the organization of cortical actin seems to be required to \u003cbr /\u003eendure the stress, which the ventral cells receive when they move during \u003cbr /\u003egastrulation. \u003cbr /\u003e Besides, I also show evidence that heterotrimeric G protein signaling is \u003cbr /\u003einvolved in the control of the actin dynamics in syncytial blastderm stage. In \u003cbr /\u003ethis stage, nuclear division is carried out with the assistance of two architectures \u003cbr /\u003eof actin cytoskeleton; actin caps in interphase and pseudocleavage \u003cbr /\u003efurrow-assembled actin network in mitosis. G protein is colocalized with the caps \u003cbr /\u003eand network of actin throughout this stage. In the ric-8mutant, this localization \u003cbr /\u003epattern is lost and actin cytoskeleton shows abnormal morphology. Using \u003cbr /\u003elive-imaging technique, it is revealed that the ric-8 mutant shows the delay of the \u003cbr /\u003echange of actin morphology. These results suggest that G protein regulates \u003cbr /\u003etiming of the dynamic change of actin during mitosis, and provide new insight \u003cbr /\u003einto the role of G protein signaling in early embryogenesis of Drosophi7a. \u003cbr /\u003e In addition, here I introduce a novel mutant of ric-8 gene, ric8\u003csup\u003eatx\u003c/sup\u003e, in which \u003cbr /\u003e408th E is substituted to K. The ric8\u003csup\u003eatx\u003c/sup\u003e mutant embryo shows cta- or fog like \u003cbr /\u003ephenotype of gastrulation, which is milder than that of the ric-8 null mutant. \u003cbr /\u003eConsistently, the ric8\u003csup\u003eatx\u003c/sup\u003e mutation results in the Gα12-specific defect of targeting. \u003cbr /\u003eAlthough the role of Ric-8 has been inferred from the results of genetic analyses \u003cbr /\u003eand of some in vitro assays in past studies, the true molecular function of this \u003cbr /\u003eprotein is stil1 unclear. 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Roles of Ric-8 dependent targeting of heterotrimeric G proteins in early embryogenesis of Drosophila
https://ir.soken.ac.jp/records/1032
https://ir.soken.ac.jp/records/10320891cc1b-42d9-4e42-b7c4-00410e450b99
名前 / ファイル | ライセンス | アクション |
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Item type | 学位論文 / Thesis or Dissertation(1) | |||||
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公開日 | 2010-02-22 | |||||
タイトル | ||||||
タイトル | Roles of Ric-8 dependent targeting of heterotrimeric G proteins in early embryogenesis of Drosophila | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Roles of Ric-8 dependent targeting of heterotrimeric G proteins in early embryogenesis of Drosophila | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_46ec | |||||
資源タイプ | thesis | |||||
著者名 |
兼崎, 琢麿
× 兼崎, 琢麿 |
|||||
フリガナ |
カネサキ, タクマ
× カネサキ, タクマ |
|||||
著者 |
KANESAKI, Takuma
× KANESAKI, Takuma |
|||||
学位授与機関 | ||||||
学位授与機関名 | 総合研究大学院大学 | |||||
学位名 | ||||||
学位名 | 博士(理学) | |||||
学位記番号 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 総研大甲第1061号 | |||||
研究科 | ||||||
値 | 生命科学研究科 | |||||
専攻 | ||||||
値 | 18 遺伝学専攻 | |||||
学位授与年月日 | ||||||
学位授与年月日 | 2007-03-23 | |||||
学位授与年度 | ||||||
2006 | ||||||
要旨 | ||||||
内容記述タイプ | Other | |||||
内容記述 | Heterotrimeric G protein signaling is involved in various pathways in animal <br />development. During Drosophila gastrula ion, Ga12 (Cta)mediated signaling <br />controls the ventral cellular movements of epithelia. Here, I show that G Protein <br />signaling also regulates the organization of cortical actin cytoskeleton underlining <br />plasma membrane in the epithelial cells. Multiple Gα subfamilies, Gα12 and <br />Gαi, are involved in the actin organization, but a known ligand of Gα12, Fog, is <br />not required. When rie-8, which is required for plasma membrane-targeting of <br />whole G proteins and their signaling activity, is mutated, the cell surfaces become <br />unstable and show blebs, and entire cellular movements in gastrulation are <br />delayed. The mutants for the common cofactors of the Gα's, GB13F and Gγ1, <br />show the similar phenotypes. Ventral cells also showed blebs like the ric-8 <br />mutant when the cells are treated with inhibitors of actin polymerization. The <br />disruption of cortical actin in the mutants for G proteins is seen in all epithelial <br />cells, but the disorganization of the surface occurs only in the moving ventral cells. <br />This suggests that the organization of cortical actin seems to be required to <br />endure the stress, which the ventral cells receive when they move during <br />gastrulation. <br /> Besides, I also show evidence that heterotrimeric G protein signaling is <br />involved in the control of the actin dynamics in syncytial blastderm stage. In <br />this stage, nuclear division is carried out with the assistance of two architectures <br />of actin cytoskeleton; actin caps in interphase and pseudocleavage <br />furrow-assembled actin network in mitosis. G protein is colocalized with the caps <br />and network of actin throughout this stage. In the ric-8mutant, this localization <br />pattern is lost and actin cytoskeleton shows abnormal morphology. Using <br />live-imaging technique, it is revealed that the ric-8 mutant shows the delay of the <br />change of actin morphology. These results suggest that G protein regulates <br />timing of the dynamic change of actin during mitosis, and provide new insight <br />into the role of G protein signaling in early embryogenesis of Drosophi7a. <br /> In addition, here I introduce a novel mutant of ric-8 gene, ric8<sup>atx</sup>, in which <br />408th E is substituted to K. The ric8<sup>atx</sup> mutant embryo shows cta- or fog like <br />phenotype of gastrulation, which is milder than that of the ric-8 null mutant. <br />Consistently, the ric8<sup>atx</sup> mutation results in the Gα12-specific defect of targeting. <br />Although the role of Ric-8 has been inferred from the results of genetic analyses <br />and of some in vitro assays in past studies, the true molecular function of this <br />protein is stil1 unclear. The findings from the analyses of ric8<sup>atx</sup> promote <br />elucidating the mysterious function of Ric-8 protein in viva . | |||||
所蔵 | ||||||
値 | 有 |