TRIM66は単一嗅覚受容体遺伝子発現、神経活動、および嗅覚行動を決定するエピジェネティックリプレッサーである
Hongqiang Bao1,2, Rong Liu1,2, Yalei Kong1,2
1Department of Otolaryngology, Songjiang Research Institute, Shanghai Key Laboratory of Emotions and Affective Disorders, Songjiang Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Nature communications
|December 12, 2025
まとめ
研究者らは、TRIM66を嗅覚受容体遺伝子選択における主要なリプレッサーとして特定した。嗅覚感覚ニューロン(OSN)におけるTrim66の削除は、嗅覚受容体遺伝子のサイレンシングを妨げ、嗅覚処理と行動に影響を与える。
科学分野:
- 神経科学
- 遺伝学
- 分子生物学
背景:
- 嗅覚受容体(OR)遺伝子選択は、単一遺伝子性および単一アレル発現の複雑なプロセスです。
- 未成熟の嗅覚感覚ニューロン(OSN)は複数のOR遺伝子を発現し、成熟中に1つだけをサイレンシングします。
- このサイレンシングを制御する分子メカニズムとリプレッサーは、依然として大部分不明です。
研究 の 目的:
- 余分な嗅覚受容体遺伝子をサイレンシングする分子リプレッサーを特定すること。
- 嗅覚受容体遺伝子発現が多遺伝子性から単一遺伝子性へと移行するメカニズムを解明すること。
- 嗅覚受容体遺伝子サイレンシング障害の機能的影響を調査すること。
主な方法:
- マウスモデルにおけるTrim66の遺伝的削除を利用しました。
- 単一の成熟した嗅覚感覚ニューロン(OSN)における遺伝子発現を分析しました。
- 嗅覚受容体エンハンサーとTRIM66の分子相互作用を調査しました。
主要な成果:
- TRIM66は、嗅覚受容体遺伝子発現の重要なリプレッサーとして特定されました。
- Trim66の削除は、成熟したOSNにおける複数のOR遺伝子の保持をもたらしました。
- TRIM66は嗅覚受容体エンハンサーに結合し、リプレッションすることで、余分なOR遺伝子をサイレンシングします。
- Trim66の削除は、嗅覚情報処理と生得的行動における重大な欠陥につながりました。
結論:
- TRIM66は、多遺伝子性から単一遺伝子性への嗅覚受容体発現への移行における主要な分子プレーヤーです。
- TRIM66媒介性リプレッションは、適切な嗅覚感覚ニューロン機能と行動に不可欠です。
- 本研究は、嗅覚遺伝子選択調節の理解における失われたリンクを特定します。
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