JP5257875B2 - 微生物に対する突然変異誘発方法 - Google Patents
微生物に対する突然変異誘発方法 Download PDFInfo
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Description
(1) 微生物菌体に、500〜1200keV/μmの線エネルギー付与(LET)を有する重イオンビームを照射し、該微生物の遺伝子に変異を導入することを特徴とする、微生物に対する突然変異誘発方法。
(2) 重イオンビームが、鉄イオンビーム、キセノンイオンビーム、またはクリプトンイオンビームである、(1)に記載の方法。
(3) 遺伝子の変異が、挿入変異、欠失変異、および点変異から選ばれる少なくとも1種以上である、(1)に記載の方法。
(4) 欠失変異の大きさが、200bp以上である、(3)に記載の方法。
(5) (1)〜(4)のいずれかに記載の方法によって得られた突然変異微生物株。
(6) (1)〜(4)のいずれかに記載の方法によって得られた突然変異微生物株のライブラリー。
重イオンビームによって誘発される突然変異の特徴についてDNAレベルで明らかにするために、ショ糖存在下で致死性を付与する枯草菌由来のレバンスクラーゼ遺伝子(sacB遺伝子)を導入したレポーター微生物を用いた解析を行った。
常時発現プロモーター(Pneo)の下流にsacB遺伝子と抗生物質耐性遺伝子(ゲンタマイシン耐性遺伝子)を導入したコンストラクトを構築し、これをミヤコグサ根粒菌(Mesorhizobium loti)ゲノムにエレクトロポレーション法によって挿入した。得られた根粒菌形質転換体のうち、通常の栄養培地上では野生型株とほぼ同等の生育を示してコロニーを形成したが、5% (w/v)のショ糖を含有する培地上では全くコロニーを形成しなかった株を選抜し、本菌株をLine #1と命名した。サザンブロットハイブリダイゼーションにより、Line #1は単一コピーの導入コンストラクトをそのゲノム上に有することがわかった。
上記ショ糖感受性根粒菌株Line #1をポリエチレンチューブ中でL-乾燥法によって乾し、照射実験に供した。乾燥菌体に対して135MeV/uの炭素イオンビーム(LET: 23, 40, 60 keV/μm)を2.5〜25Gy、または90MeV/uの鉄イオンビーム(LET: 640keV/μm)を0.1〜15Gyを照射した。
Claims (1)
- L−乾燥法による乾燥微生物菌体に、500〜1200keV/μmの線エネルギー付与(LET)を有する鉄イオンビームを照射し、該微生物の遺伝子に変異を導入することを特徴とする、微生物に対する突然変異誘発方法であって、200bp以上の大きさの欠失変異が得られる、方法。
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