米の干ばつ反応中の遺伝子発現の調節における5-ヒドロキシメチルシトシンのゲノム上での文脈依存的役割
Xiaohao Yan1,2, Yeling Zhou1,2, Shijie Gan2
1Shenzhen Key Laboratory of Plant Genetic Engineering and Molecular Design, Institute of Plant and Food Science, Southern University of Science and Technology, Shenzhen, 518055, China.
The Plant journal : for cell and molecular biology
|August 22, 2025
まとめ
この研究では,米の5ヒドロキシメチルサイトシン (5hmC) をマッピングし,干ばつストレス中の動的変化と5メチルサイトシン (5mC) との相互作用を明らかにした. 発見は5hmCを示している.
科学分野:
- 植物エピジェネティクス
- 分子生物学
- ゲノミクス
背景:
- DNAメチル化 (5-メチルサイトシン,5mC) は植物ゲノムの安定性とストレスへの適応に不可欠である.
- 5mCの酸化誘導体である5-hydroxymethylcytosine (5hmC) の役割は,その少量および不明な起源のために,植物では十分に理解されていません.
研究 の 目的:
- 米 (Oryza sativa) の5hmCの最初の単基解像度マップを作成する.
- 干ばつ適応における5hmCと5mCのダイナミクスと規制の相互作用を調査する.
主な方法:
- ゲノム全体の5hmCおよび5mCプロファイリングのための統合されたACE-seqおよび最適化されたTn5mC-seq.
- マルチオミクス分析を用いて,エピジェネティックマークと遺伝子発現を関連付けました.
主要な成果:
- 干ばつで米の塩基レベルが5hmCとされ,干ばつで米の塩基レベルが大幅に低下し,回復は不完全であった.
- 5hmCは好ましくユークロマティック領域に局所し,5mCの異色分布とは対照的であることが示された.
- 干ばつで5hmCと5mCの間の敵対的な関係が明らかにされ,トランポゾン静止のために5mCが増加しました.
- プロモーターにおける5hmCの減少は遺伝子のダウンレギュレーションと相関し,体内の遺伝子の蓄積は遺伝子の発現を抑制することが示された.
結論:
- 5hmCは,植物のストレス中にトランスクリプションの可塑性とゲノムの安定性をバランスさせる上での文脈依存のバイ機能的調節作用を示している.
- 植物の環境適応に関与するダイナミックな表遺伝子マークとして5hmCを確立した.
- 農作物の耐性工学におけるDNAヒドロキシメチル化の基礎となる.
さらに関連する動画
関連する概念動画
02:41Responses to Drought and Flooding
10.9K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.9K
01:17Gene Regulation During Sporulation
77
Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
77
01:27Constitutive and Regulated Gene Expression
123
Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
123
02:02Responses to Salt Stress
13.4K
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
13.4K
01:10Transcription
148.1K
Overview
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
Transcription is the process of synthesizing RNA from a DNA sequence by RNA polymerase. It is the first step in producing a protein from a gene sequence. Additionally, many other proteins and regulatory sequences are involved in the proper synthesis of messenger RNA (mRNA). Regulation of transcription is responsible for the differentiation of all the different types of cells and often for the proper cellular response to environmental signals.
Transcription Can Produce Different Kinds...
148.1K
01:57Adaptations that Reduce Water Loss
26.3K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
26.3K