メトトレキサート耐性リーシュマニアの不安定なDNA増幅は,安定化中に転位する染色体外円で構成されています
Cell
|September 1, 1984
まとめ
メソトレキサート耐性リーシュマニア・トロピカは,DNA増幅を行い,不安定な円形DNAを形成し,薬物の選択により染色体配列に安定します. このプロセスは,哺乳類の細胞で見られる遺伝子増幅を反映しています.
科学分野:
- 分子生物学は分子生物学である.
- 寄生虫学とは,寄生虫学である.
- 遺伝学 遺伝学とは
背景:
- Leishmania tropicaは,重要な抗寄生剤であるメトトレキサートに耐性を発達させる.
- 原生動物の薬剤耐性は,DNA増幅を含む遺伝的変異としばしば関連しています.
研究 の 目的:
- メトトレキサート耐性の分子メカニズムを調査するために Leishmania tropica.
- 増幅DNA領域の性質と安定性を特徴付ける.
主な方法:
- メトトレキサートの濃度が増加する Leishmania tropica の培養.
- CsCl-エチジウムブロミド密度グラデント遠心分離を用いて増幅DNAを分析する.
- 増幅されたDNA配列とその染色体関連性を特徴づける.
主要な成果:
- レジスタントのリーシュマニア・トロピカ (Leishmania tropica) において,2つの異なった増幅DNA領域が特定されました.
- 一つの増幅された領域は,二機能性チミジラートシンセタゼ-ダイヒドロフォラート還元酵素 (TS-DHFR) をコードする.
- 増幅DNAは当初,不安定な染色体外円形の形で存在し,長期の薬物選択の下で安定した染色体配列へと移行する.
結論:
- この研究は,Leishmania tropica.の遺伝子増幅の分子基盤を明らかにしています.
- この発見は,リーシュマニアの遺伝子増幅メカニズムと哺乳類の細胞の間の類似性を明らかにしています.
- 増幅されたDNAの安定した染色体統合は,薬剤耐性を持続させる.
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