JMJD6とYBX1は物理的に相互作用し,HOTAIR近接プロモーターを調節する
Aritra Gupta1,2, Siddharth Bhardwaj1, Kartiki V Desai1,2
1Biotechnology Research Innovation Council-National Institute of Biomedical Genomics (BRIC-NIBMG), Kalyani, West Bengal, India.
The Biochemical journal
|August 26, 2025
まとめ
Yボックス相互作用タンパク質1 (YBX1) は,HOTAIRプロモーターにタンパク質6 (JMJD6) を含んだジャンモニドメインを物理的に誘導し,腫瘍の進行を促します. この相互作用により,乳がんにおけるHOTAIR発現を高める ポジティブなフィードバックループが形成されます.
科学分野:
- 分子生物学
- 癌 研究
- エピジェネティクス
背景:
- 以前の研究では,HOTAIRプロモーターに結合するタンパク質6 (JMJD6) を含むジャンモニドメインが特定されました.
- さらに調査したところ,JMJD6のバインディングサイトより上流に規制区域があることが明らかになった.
- In silicoとENCODEのデータは,Y-box相互作用タンパク質1 (YBX1) がこの上流領域に結合することを示唆しています.
研究 の 目的:
- 乳がん細胞系におけるJMJD6とYBX1の相互作用を検証する.
- HOTAIR表現に対するJMJD6-YBX1相互作用の機能的影響を明らかにする.
- YBX1がHOTAIRのプロモーターにJMJD6を勧誘するメカニズムを決定する.
主な方法:
- タンパク質とタンパク質の相互作用を確認するための共免疫降水測定法.
- 削除コンストラクタを使用してドメインマッピング.
- ルシフェラゼの記者は プロモーターの活動を評価する
- siRNA媒介による減量と遺伝子ノックアウト (YKO) で,機能的効果を研究する.
- 染色体免疫降水 (ChIPとChIP-re-ChIP) と電泳運動シフトアッセイ (EMSA)
主要な成果:
- JMJD6とYBX1は直接相互作用し,YBX1のA/PドメインはJMJD6のJMJCドメインと結合する.
- YBX1はHOTAIRプロモーターの活性を高め,YBX1相互作用領域 (YIR) の枯渇または変異は活性を減少させます.
- JMJD6とYBX1の両方がHOTAIRのプロモーターを占め,YBX1はJMJD6の採用に不可欠です.
- JMJD6とYBX1が相互に表現を調節し,HOTAIR誘導を増加させるポジティブなフィードフォワードループが存在する.
結論:
- YBX1は,JMJD6を乳がん細胞のHOTAIRプロモーターに誘導するために不可欠です.
- JMJD6-YBX1の相互作用とその正のフィードバックループがHOTAIR表現を駆動する.
- このメカニズムは腫瘍の進行に寄与し,JMJD6とYBX1を潜在的な治療標的として強調しています.
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