サイトキニン受容体の機能獲得変異は,自発的な根結節組織生成を誘発する

Leïla Tirichine¹, Niels Sandal, Lene H Madsen

¹Laboratory of Gene Expression, Department of Molecular Biology, University of Aarhus, Gustav Wieds Vej 10, DK-8000 Aarhus C, Denmark.

Science (New York, N.Y.)

|November 18, 2006

まとめ

植物ホルモンであるサイトキニンは,豆類の根の結節形成を誘発する. サイトキニン受容体遺伝子の突然変異により,自発的な結節が形成され,サイトキニンが発現した.

科学分野:

植物生物学植物生物学
分子生物学は分子生物学である.
遺伝学遺伝学とは

背景:

豆類の根の結節は,窒素の固定に不可欠です.
結節の形成は,通常,共生細菌 (リゾビア) によって開始されます.
細胞の脱差と細胞サイクル再開は,早期の重要なイベントです.

研究の目的:

植物ホルモンであるサイトキニンが,豆類の根ノドルの発育を誘発する役割を調査する.
このプロセスに関与する特定のサイトキニン受容体を特定するために.
サイトキニンの知覚の下流にある信号経路を理解するために.

主な方法:

ロータス・ジャポニクス (Lotus japonicus) の変異体の遺伝子解析.
変異したサイトキニン受容体遺伝子 (ヒスティジンキナーゼ) の特徴.
Escherichia coli の2つの構成要素のフォスフォレレイシステムを用いた in vivo 機能分析.

主要な成果:

ロータス・ジャポニクス (Lotus japonicus) のサイトキニン受容体遺伝子の突然変異により,リゾビアなしで自発的に結節が形成された.
変異した受容体は,サイトキニン独立の活性を示した.
細胞分裂がノドルの発達を開始するために,サイトキニンのシグナル伝達が不可欠でした.
結節幹細胞のサイトキニン誘導は,シートによって調節されます.

結論:

サイトキニンの知覚は,豆類の根の結節の発達を開始するための重要なスイッチです.
サイトキニンのシグナル伝達は,ノードル組織形成の自己調節プロセスにおける重要な調節因子として作用する.
この発見は,植物における共生相互作用のホルモン制御に関する新しい洞察を提供します.

さらに関連する動画

09:36

Detecting Protein Subcellular Localization by Green Fluorescence Protein Tagging and 4',6-Diamidino-2-phenylindole Staining in Caenorhabditis elegans

Published on: July 30, 2018

07:26

Isolation of Whole Cell Protein Lysates from Mouse Facial Processes and Cultured Palatal Mesenchyme Cells for Phosphoprotein Analysis

Published on: April 1, 2022

関連する概念動画

02:16

Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...

02:54

Nucleosome Remodeling

Nucleosomes are the basic units of chromatin compaction. Each nucleosome consists of the DNA bound tightly around a histone core, which makes the DNA inaccessible to DNA binding proteins such as DNA polymerase and RNA polymerase. Hence, the fundamental problem is to ensure access to DNA when appropriate, despite the compact and protective chromatin structure.
Nucleosome remodeling complex
Eukaryotic cells have specialized enzymes called ATP-dependent nucleosome remodeling enzymes. These enzymes...

01:30

General Transcription Factors

01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...

01:29

Somatic to iPS Cell Reprogramming

Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012 for this...

01:24

Methods of Nuclear Reprogramming

Nuclear reprogramming is a process of transforming one cell type into an unrelated cell type by epigenetic changes that alter the cell’s original gene expression pattern. Such epigenetic changes force cells to express a different set of genes, which play a significant role in inducing transformation into other cell types. Nuclear reprogramming offers applications in reproductive cloning for livestock propagation and regenerative medicine — developing patient-specific cells for injury repair.

関連する実験動画