関連する実験動画
Updated: Jul 15, 2026

07:47
Microscopy of Fission Yeast Sexual Lifecycle
Published on: March 9, 2016
HO転写の陽性と陰性の両方のレギュレータは,母細胞特異の交配型スイッチングを酵母菌で行うために必要である
Cell
|February 27, 1987
まとめ
新しいSDI1およびSDI2遺伝子は,子細胞にHO遺伝子を発現させ,酵母における交配型切り替えを開始します. これはHOトランスクリプションを示唆しています.
科学分野:
- 分子生物学は分子生物学である.
- イースト遺伝学 イースト遺伝学
- 細胞サイクル規則 細胞サイクル規則
背景:
- HO遺伝子は,酵母における交配型切り替えの開始に不可欠です.
- HO遺伝子の転写は,STARTの間に母細胞のみで,子細胞では起こらない.
- 6つの遺伝子 (SWI1-6) は,HO転写に不可欠であることが知られている.
研究 の 目的:
- HO転写の調節に関与する新しい遺伝子を特定し,特徴づけること.
- HOの母細胞特異的発現におけるSWI5の役割を調査する.
- HOの細胞サイクル依存の転写の基礎となるメカニズムを理解する.
主な方法:
- 新型遺伝子SDI1およびSDI2.2における突然変異の分離と特徴づけ
- 様々な変異酵母菌株 (swi5- sdi1- と SWI5+ sdi1-) での交配型交換の分析.
- 子細胞におけるHO遺伝子発現に対するSDI1とSDI2の影響を調査.
主要な成果:
- SDI1とSDI2の変異は,SWI5.5の要求を部分的に抑制する.
- SDI1およびSDI2変異は,子細胞におけるHO遺伝子発現を可能にします.
- 分析によると,SWI5は母細胞で選択的に作用し,HOの転写特異性を授与する.
結論:
- HO転写の母細胞特異性は,母細胞におけるSWI5の選択的作用によってのみ決定される.
- SDI1はHOプロモーターに結合するレプレッサーをコードし,子細胞の転写を防ぐ.
- SDI1はHOの転写がSWI5に完全に依存することを保証し,母細胞に限定する.
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