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グルタミン酸受容体のような経路は,モスの化学反応と繁殖に不可欠である
Carlos Ortiz-Ramírez1, Erwan Michard1,2, Alexander A Simon2
1Instituto Gulbenkian de Ciência, Oeiras, 2780-156, Portugal.
Nature
|July 25, 2017
まとめ
グルタミン酸受容体は,精子細胞をターゲットに誘導し,ジゴットの発達のための遺伝子発現を制御することによって,植物の生殖を調節する. この研究は,植物受精におけるこれらのチャネルの保存された役割を明らかにしています.
科学分野:
- 植物生物学
- 分子生物学
- 細胞生物学
背景:
- グルタミン酸受容体は動物における神経伝達を媒介する.
- 植物のような神経系でない生物におけるグルタミン酸受容体の機能はほとんど不明である.
- 植物性グルタミン酸受容体 (GLR) のような遺伝子は様々なプロセスに関与しますが,変異体における強い表型は稀です.
研究 の 目的:
- 基礎陸生植物フィスコミトレラ・パテンスのGLR遺伝子の役割を調査する.
- 植物性繁殖におけるGLRチャネルの機能を明らかにする.
主な方法:
- Physcomitrella patensのGLR1とGLR2に対する機能喪失変異を生成した.
- 精子細胞の行動と 生殖の成功を分析した
- GLRタンパク質のイオンチャネル特性とそのカルシウムシグナル伝達と遺伝子発現への影響について調査した.
主要な成果:
- GLR1とGLR2の変異は精子細胞の化学反応に欠陥を与え,精子細胞が女性の生殖器に到達するのを妨げました.
- GLR遺伝子は,非選択的,カルシウム浸透性チャンネルをコードし,細胞質カルシウムレベルを調節する.
- GLRの活動は,ジゴットの発達に不可欠なBELL1のような転写因子の発現を誘導するために必要である.
結論:
- GLRチャネルは,植物繁殖中の精子の化学反応と転写制御において重要な役割を果たします.
- これらの発見は,イオノトロプ的グルタミン酸受容体が,植物進化の過程で細胞間伝達のために保存されていることを示唆している.
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