JP4527527B2 - 植物での創傷誘導発現 - Google Patents
植物での創傷誘導発現 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
- C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
- C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
- C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
- C12N15/8271—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance
- C12N15/8279—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for biotic stress resistance, pathogen resistance, disease resistance
- C12N15/8286—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for stress resistance, e.g. heavy metal resistance for biotic stress resistance, pathogen resistance, disease resistance for insect resistance
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/146—Genetically Modified [GMO] plants, e.g. transgenic plants
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Description
配列番号1:TR2’プロモーターの好適実施多様のヌクレオチド配列
配列番号2:pTSVH0212の配列
配列番号3:修飾cry1Abコード配列の配列
a) 形質開発
殺虫性遺伝子をコードするDNA配列の創傷誘導発現を評価するために、修飾したcry1Abタンパク質の発現を支配するTR2’プロモーターを含む(Valtenら、1984年)プロモーター領域を含む構築体を作製した。Agrobacterium−介在形質転換に関しては、T−DNA境界(‘TR2’−Cry1Ab’とも呼ばれる)の間に問題の遺伝子を含むプラスミドpTSVH0212を用いた(国際特許出願番号WO98/37212)
Agrobacterium形質転換体を、T−DNAの左境界にベクター配列が存在するか調べた。一次形質転換体(T0)の葉材料を使ってサザンブロット分析を行った。
i)殺虫性タンパク質の基礎発現
修飾したCry1Ab殺虫性タンパク質の発現の基礎レベルを、Jansensら、1997年記載の抽出法および緩衝液を用いて可溶性タンパク質を抽出した後、Cry1Abに対するポリクローナルウサギ孔結成のポリ濃縮IgG分画を第1抗体に、そしてCry1Abに対するモノクローナル抗体を第2抗体に利用するCry1AbサンドイッチELISAにより決定した。V3ステージの植物の葉、R1ステージの花粉および葉、ならびに収穫時の葉、茎および花粉のサンプルを温室栽培植物より得た(トウモロコシのステージは「How a Corn Plant Develops、Special Reprot No.48、Iowa State University of Science and Technology、Cooperative Extension Service、Ames、Iowa、1993年6月増刷」に記載されたものである;また関連情報を含むインターネットウェブサイト:http://www.extension.iastate.edu/pages/hancock/agriculture/corn/corn_develop/CornGrowthStages.htmlも参照)。比較するために、Gos/gos−cry1Ab構築体で形質転換した植物からサンプルを得た。
温室内にて研究を行い、非形質転換植物、TR2’−cry1Ab構築体を利用して得た植物、およびGos/gos−cry1Ab構築体を利用して得た植物での、機械損傷時の殺虫性Cry1Abタンパク質の発現を決定した。葉および根を切除して損傷した。創傷は完全に広げられた葉に、中央葉脈を損傷しないようメスを使って葉にそれぞれに1mmの垂直な切り込として加えられた。機械損傷前と18時間後に葉サンプルを採取した。Cry1Abタンパク質レベルは、切出した葉部分(葉部分は創傷の周囲2〜3mmを切り取ったものであった)を、ペトリ皿の中に置かれた、Murashige and Skoog培地(MS培地、組成についてはBIOS Scientific Publications Ltd (UK) およびBlackwell Scientific Publications, UKが共同出版したR.D.D.CroyによるPlant Molecular Biology Labfax (1993) を参照)で湿らせた濾紙の上に置いて、20℃の栽培チャンバー内で18時間インキュベーションしてからELISAを用いて測定した−よりサイズの小さいのコントロール葉の小片を植物から切り出し、その直後にドライアイスの上に置いてタンパク質測定を行った(in vitroインキュベーションなし)。平均値は形質転換イベントあたり5個体の植物の平均である。
a)ECB第4齢幼虫による制御摂食に対する効果
プレキシガラス製シリンダ内に中型の輪生トウモロコシ植物を入れ、10または15匹の第4齢のアワノメイガ幼虫に摂食させた。10日後、植物を切開して、植物毎に幼虫の生存率をスコア化した。結果を表6に示す。
温室および野外試験でECBの効果について、14のイベントを評価した(表7)。結果は植物毎の、最大長の空洞の平均長に対する平均空洞長(ブラケット間の標準偏差値)で表している(平均値(sd)/最大長/植物)。温室では、空洞の平均長は10植物個体の測定値より得た。野外では、ECB効力は各群10個体より得た3つの値の平均値として表した。5つあるシングルコピーイベント(アスタリスクで示した)の内4イベントについて、平均空洞長3.5cm未満とされる全ECBコントロールを得た。
5株の中型のTR2’−cry1Ab構築体を含む輪生トウモロコシ植物それぞれに2個の卵塊を付着した。14日後に損傷度を調べ、幼虫数を数えた。損傷度は5株の植物全てに見積もった(cmで表した植物の高さ、植物当たりの空洞の長さで示した)。結果を表8に示す。
上記に用いたものと同一のCry1Abコード配列を持つトウモロコシ植物でのMPIプロモーター(Breitlerら、2001年が創傷誘導プロモーターと記載している)を用いた発現分析を行い、野外での基礎(非誘導)レベルと創傷誘導とを比較した。このMPIプロモーター制御下にある殺虫性Cry1Ab蛋白質部分発現トウモロコシ植物は、温室試験では、葉の全可溶性蛋白質当たり少なくとも約0.04%のCry1Abタンパク質の基礎平均発現レベルを示す。またイベント2MPI−Cry1Abを用いた最初の温室試験でも、創傷時の発現レベルに若干の変動が見られたが、これら植物より新たに得た植物材料および切り離した後in vitroでインキュベーションした葉について濃度を測定した場合(いずれのケースも濃度は創傷後21時間および42時間眼に各種サンプルについて測定した)には、いずれも創傷誘導によりCry1Abタンパク質発現が基礎(平均)レベルに比べて少なくとも5倍になることはなかった(機械的損傷後)。即ち、これらMPIプロモーターを利用したアッセイでは、Cry1Abタンパク質の発現誘導は全くないか、弱いものである。
Claims (25)
- TR2’プロモーターを含むプロモーター領域の制御下にある殺虫性タンパク質をコードするDNA配列を含むキメラ遺伝子を含み、そのゲノム内に安定に組み込まれている、昆虫耐性トウモロコシ植物であって、高用量の該殺虫性タンパク質を発現する前記植物。
- トウモロコシ植物が10日間のバイオアッセイにて第4齢アワノメイガ幼虫の少なくとも97%を死滅させる、請求項1記載の植物。
- 前記殺虫性タンパク質がBacillus Thuringiensis毒素である、請求項1〜2のいずれか1項に記載の植物。
- 前記TR2’プロモーターが、ヌクレオチド番号1〜336の間のヌクレオチド位置からヌクレオチド位置483までの配列番号1の断片を含むプロモーター領域である、請求項1〜3のいずれか1項に記載の植物。
- 前記TR2’プロモーターが、配列番号1のヌクレオチド96〜483の配列を含む、請求項1〜3のいずれか1項に記載の植物。
- 前記TR2’プロモーターが、配列番号1の配列を含む、請求項1〜3のいずれか1項に記載の植物。
- 単子葉植物の中に殺虫性毒素の創傷誘導高用量発現を獲得する方法であって、上記方法が
a)b)に作動性に連結した、殺虫性タンパク質をコードするDNA配列、
b)TR2’プロモーターを含む植物発現性プロモーター領域
を含むキメラ遺伝子を植物内に導入することを含む、方法。 - 上記単子葉植物がトウモロコシであり、かつ上記トウモロコシ植物が10日間のバイオアッセイにて第4齢アワノメイガ幼虫の少なくとも97%を死滅させる、請求項7に記載の方法。
- 上記単子葉植物がトウモロコシであり、かつ前記創傷誘導発現が、温室栽培植物に於ける上記植物の葉での殺虫性タンパク質の平均基礎発現レベルが全可溶性タンパク質の0.005%以下であることを特徴とする、請求項7〜8のいずれか1項に記載の方法。
- 前記TR2’プロモーターが、ヌクレオチド番号1〜336の間のヌクレオチド位置からヌクレオチド位置483までの配列番号1の断片を含むプロモーター領域である、請求項7〜9のいずれか1項に記載の方法。
- 前記TR2’プロモーターが、配列番号1のヌクレオチド96〜483の配列を含む、請求項7〜9のいずれか1項に記載の方法。
- 前記TR2’プロモーターが、配列番号1の配列を含む、請求項7〜9のいずれか1項記載の方法。
- 高用量の殺虫性タンパク質を発現する、昆虫耐性単子葉植物の作製方法であって、上記方法が
a)b)に作動性に連結した、殺虫性タンパク質をコードするDNA配列、
b)TR2’プロモーターを含む植物発現性プロモーター領域
を含むキメラ遺伝子を上記植物のゲノム内に導入することを含む方法。 - 前記TR2’プロモーターが、ヌクレオチド番号1〜336の間のヌクレオチド位置からヌクレオチド位置483までの配列番号1の断片を含むプロモーター領域である、請求項13記載の方法。
- 前記TR2’プロモーターが、配列番号1のヌクレオチド96〜483の配列を含む、請求項13記載の方法。
- 前記TR2’プロモーターが、配列番号1の配列を含む、請求項13記載の方法。
- 上記単子葉植物がトウモロコシであり、かつ上記トウモロコシ植物が10日間のバイオアッセイにて第4齢アワノメイガ幼虫の少なくとも97%を死滅させる、請求項13〜16のいずれか1項に記載の方法。
- 上記単子葉植物がトウモロコシであり、かつ前記創傷誘導発現が、温室栽培植物に於ける上記植物の葉での殺虫性タンパク質の平均基礎発現レベルが全可溶性タンパク質の0.005%以下であることを特徴とする、請求項13〜17のいずれか1項に記載の方法。
- 温室内の上記植物の葉での平均発現レベルが、創傷が無い場合には全可溶性タンパク質の0.005%以下であり、そして創傷時には上記平均発現レベルが少なくとも5倍増加する、請求項7に記載の方法。
- 上記単子葉植物がトウモロコシであり、かつ上記トウモロコシ植物が10日間の植物全体バイオアッセイにて第4齢アワノメイガ幼虫の少なくとも97%を死滅させる、請求項19に記載の方法。
- 上記植物がトウモロコシであり、かつ上記の0.005%以下の基礎発現がV4ステージの葉で測定される、請求項19または20に記載の方法。
- 前記殺虫性タンパク質がBtタンパク質である、請求項19〜21のいずれか1項に記載の方法。
- 上記Btタンパク質がCry1Ab、Cry1F、Cry2Ae、Cry9CおよびCry2Abならびにその殺虫性断片の群から選択される、請求項22に記載の方法。
- 上記タンパク質が配列番号3にコードされるタンパク質である、請求項1に記載の植物。
- 上記Btタンパク質が、Cry1Ab、Cry1F、Cry2AeおよびCry2Aならびにその殺虫性断片の群より選択される、請求項3に記載の植物。
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CN103937904B (zh) * | 2007-06-11 | 2016-08-24 | 拜尔作物科学公司 | 包含优良事件ee-gh6的抗虫棉花植物及其鉴定方法 |
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