JP2023071957A - タバコベルベリンブリッジ酵素様の核酸の標的化された突然変異誘発 - Google Patents
タバコベルベリンブリッジ酵素様の核酸の標的化された突然変異誘発 Download PDFInfo
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Abstract
Description
本出願は、合衆国法典第35巻第119条(e)の下で、2015年12月4日に出願された米国仮出願番号62/263,151の利益を主張し、その内容全体は、本明細書中に参照により援用される。
本発明は、ベルベリンブリッジ酵素様の核酸の改変、および、植物におけるニコチン性アルカロイド生合成の調節でのそれらの使用に関する。
BBL遺伝子ファミリーのサイレンシングが、従来の圃場栽培条件下で低減されたニコチンタバコ植物を得る実行可能な手段を示すかどうか確立するために、我々は、RNAi手法(Lewis et al.,2015)を用いた。Kajikawa et al.,(2011)は、BBLa、BBLb、BBLcおよびBBLdと指定される4つの独特なBBLアイソフォームを報告した。遺伝子ファミリー全体を抑制する可能性を最大にするために、最も高い保存領域由来の212bpフラグメントを選択した。GenBankで示されるタバコEST配列のインシリコ分析が、BBLアイソフォームの最高の発現であることを示唆したので、抗-BBL RNAi構築物がBBLa配列に対して特異的に生産された。BBLa由来の212bpフラグメントは、BBLb、BBLcおよびBBLdの類似領域と、それぞれ94%、93%および84%同一であった。抗-BBL RNAi構築物は、BBLdと同一の最も少ない配列を共有したが、Kajikawa et al.(2011)によって行われたインシリコEST分析および逆転写酵素PCR分析の両方とも、BBLdアイソフォームは他のアイソフォームと比較して最小限で発現されることを示唆した。
Kajikawa et al.(2011)は、タバコのBBL遺伝子ファミリーを、彼らがBBLa、BBLb、BBLcおよびBBLdと指定する4つのメンバーからなると説明した。我々は、タバコゲノム内に任意の他のBBLファミリーメンバーの存在の証拠があるかどうか決定するために、GenBankに見られる様々なデータベースのBLASTに基づく分析を行なった。これらの結果は、2つのさらなるBBLファミリーメンバーの存在を明らかにした。これらのうちの1つは、BBLdと95%ヌクレオチド同一性および94%の予測アミノ酸同一性を共有する。BBLdおよびこの新規のアイソフォームが、互いに非常に密接に関連し、他のBBL遺伝子とかなり異なることを考慮して(任意の他の遺伝子ファミリーメンバーと80%未満の同一性を共有する)、我々は、これらの配列を、BBLd-1(Kajikawa et al.,2011によって報告されたオリジナルのBBLd)およびBBLd-2(新規のアイソフォーム)と称す。我々が同定した他の新規のBBLファミリーメンバーは、以前に特徴付けられたBBLa、BBLbおよびBBLc配列と90~92%ヌクレオチド同一性を共有する。我々は、この新規のファミリーメンバーBBLeと指定する。BBLe、BBLd-1およびBBLd-2のDNAおよび予測タンパク質配列を以下に示す。スタートおよびストップコドンは、ボールド体、下線タイプである。カスタムデザインされたメガヌクレアーゼ酵素の22bp標的部位の位置は、灰色で強調される。
現行技術での別の欠点は、最終産物が非トランスジェニックであることが好ましい状況のために植物において遺伝子突然変異を産生するために、EMSのような標的非特異的な突然変異原に頼っていることである。EMSのような突然変異原は、ゲノム全体にわたり突然変異をランダムに分配するように機能する。標的非特異的な薬剤を用いて目的の遺伝子における突然変異を見つける合理的な可能性を得るためには、突然変異がゲノム全体にわたって高密度で取り込まれる様式で植物を処理しなければならない。目的の遺伝子内の突然変異が、そのような突然変異誘発された集団由来の植物において同定された時点で、その結果、広範囲の戻し交配が、その植物に同様に見られるゲノム全体にわたって分配された望ましくない突然変異を全て除去しようとするために必要とされる。もし、望ましくない二次的な突然変異が目的の突然変異と密接に関連するならば、所望の突然変異体の形質からそれを分離することは困難になり得る。ランダム突然変異育種手法を用いて頻繁に遭遇する問題は、関連する有害な二次的突然変異が、重要な農学および/または品質の形質に負の影響を及ぼさない様式で、高品質の市販栽培品種に目的の突然変異体の形質を取り込むのを防ぐということである。分子生物学に基づく精度の突然変異誘発技術の最近の出現により、現在では、ゲノム全体にわたる不要なランダム突然変異を導入せずに突然変異を特定の遺伝子または目的の遺伝子に誘導することが可能である。これらの技術は、レシピエント親の好ましい属性に他の方法で負の影響を与えない様式で特異的な所望の突然変異を目的の作物のゲノム内に導入する能力を大きく増大させて、ならびに、伝統的な突然変異育種手法に関して現在のところ必要とされる広範囲の戻し交配の実施に関与する時間を低減または除去することを約束する。
[A. BBLe、BBLd-1およびBBLd-2を標的化するメガヌクレアーゼをコードする構築物]
BBLe、BBLd-1およびBBLd-2遺伝子内の特定の配列を切断するように設計されたメガヌクレアーゼをコードするプラスミドは、Precision Biosciences社によって生産された(表4)。構築物BBL 1-2x.81は、BBLe内の独特の22bp配列を認識するように改変されたヌクレアーゼをコードする。BBLd-1とBBLd-2との間で共有される高い配列同一性に起因して、これらの遺伝子の両方を標的化することが可能な単一のヌクレアーゼ(BBL 7-8x.90)を設計することができた。それぞれのカスタムデザインされたヌクレアーゼに関して、意図された遺伝子標的を除き、最近になって公表されたNicotiana tabacum参照ゲノム内のどこにも存在しない22bpの標的部位を選択した(Sierro et al.,2014)。独特の標的部位の選択は、ゲノム内の他のどこかでのオフターゲット切断の可能性を最小限にするのを助けるべきである。さらに、選択された標的部位は、高く保存されたFAD結合ドメインをコードする配列の上流の、遺伝子配列の上側3分の1に生じる(上記の実施例2における配列を参照)。したがって、これらの位置でフレームシフトをもたらす突然変異イベントは、完全に非機能性のタンパク質産物を生産することが予測される。構築物BBL 1-2x.81およびBBL 7-8x.90を、植物発現ベクターpCAMBIA2300(www.cambia.org)内にクローニングした。pCAMBIA2300内では、デザイナーヌクレアーゼの転写は、増強された35Sカリフラワーモザイクウイルスプロモーターによって駆動されて、選択は、抗生物質カナマイシンに対する耐性を与えるnptII遺伝子を介して仲介される。
BBLe、BBLd-1および/またはBBLd-2遺伝子内の突然変異の導入が、3つの以前に特徴付けられたBBL遺伝子(BBLa、BBLbおよびBBLc)内のノックアウト突然変異に関してホモ接合型の植物において達成可能なものよりも下にニコチンレベルを低下させることができるかどうか決定するために、標準的なアグロバクテリウムが介在する形質転換プロトコル(Horsch et al.,1985)を用いて構築物BBL 1-2x.81およびBBL 7-8x.90を株TN90(bbla/bblb/bblc)内に導入した。TN90(bbla/bblb/bblc)は、オリジナルの三重突然変異体bbla/bblb/bblc個体を、そのEMSによって突然変異誘発されたDH98 325-6バックグラウンド(Lewis et al.,2015)において、市販のバーレイ種栽培品種TN90中に戻し交配することによって生産された。7世代の戻し交配を行なって、TN90反復親をタイプに戻して、スタートのDH98 325-6(bbla/bblb/bblc)材料内に存在するゲノムワイドのEMS突然変異の数を大幅に減らした。それぞれの戻し交配世代では、衰弱性(debilitating)bbla、bblbおよびbblc突然変異に特異的なSNPマーカーを用いて、所望のbbl遺伝子座を保有する子孫を同定して;7つの戻し交配世代の完了の際に、個々のBC7F2を同一マーカーでスクリーニングして、3つのbbl突然変異全てに関してホモ接合型である株TN90(bbla/bblb/bblc)を同定した。
標的化された目的の突然変異を含むT0トランスジェニックを、交差および/または自家受精して、様々な可能な突然変異体の組み合わせに関してホモ接合型であり突然変異誘発性導入遺伝子(単数または複数)も分離されている子孫を生産する。いかなる外来DNAもなくて、bbld-1、bbld-2およびbble突然変異の様々な組み合わせを保有する(全て、なおも、三重突然変異体bbla/bblb/bblcバックグラウンド内である)植物を生育させて、標準的な業界慣習に従って乾燥させて、アルカロイド含有量について分析する。関連のあるオリジナルの野生型遺伝子型(例えばTN90)、ならびに、bbla、bblbおよびbblc突然変異体遺伝子座についてのみホモ接合型であるその関連のある親遺伝子型(例えばTN90(bbla/bblb/bblc))に対して、比較を行なう。加えて、全ての植物は、グレード指標および還元糖パーセントについて評価される。成果は、BBLeおよび/またはBBLd-1および/またはBBLd-2遺伝子座におけるノックアウト突然変異のピラミッド化および導入に起因して、それらのそれぞれの親植物(bblabbla/bblbbblb/bblcbblc)よりも有意に少ないニコチンを蓄積する、商業的に実現可能なバックグラウンドにおける高品質タバコ栽培品種の開発である。
Claims (28)
- ニコチン性アルカロイド含有量が低減されたニコチアナ植物または植物部分を生産する方法であって、
ニコチアナ植物または植物部分に、
(a)配列番号1のヌクレオチド配列と97%同一性を有する内因性BBLeポリヌクレオチドにおける突然変異、
(b)配列番号2のヌクレオチド配列と97%同一性を有する内因性BBLd-1ポリヌクレオチドにおける突然変異、および/または
(c)配列番号3のヌクレオチド配列と97%同一性を有する内因性BBLd-2ポリヌクレオチドにおける突然変異
を導入して、それにより、ニコチン性アルカロイド含有量が低減された植物を生産するステップを含む、
方法。 - 請求項1の方法であって、
前記ニコチン性アルカロイドは、ニコチンである、
方法。 - 請求項1または2の方法であって、
前記突然変異は、
(a)配列番号1のヌクレオチド配列と97%同一性を有するBBLeポリヌクレオチド、
(b)配列番号2のヌクレオチド配列と97%同一性を有するBBLd-1ポリヌクレオチド、および/または
(c)配列番号3のヌクレオチド配列と97%同一性を有するBBLd-2ポリヌクレオチド
の発現を低減または除去する、
方法。 - 請求項1から3のいずれか一項の方法であって、
前記突然変異は、
(a)配列番号1のヌクレオチド配列と97%同一性を有するBBLeポリヌクレオチドによってコードされるポリペプチド、
(b)配列番号2のヌクレオチド配列と97%同一性を有するBBLd-1ポリヌクレオチドによってコードされるポリペプチド、および/または
(c)配列番号3のヌクレオチド配列と97%同一性を有するBBLd-2ポリヌクレオチドによってコードされるポリペプチド
の活性を低減または除去する、
方法。 - 請求項1から4のいずれか一項の方法であって、
前記植物に前記突然変異を導入するステップは、化学突然変異誘発、挿入突然変異誘発、および/または、前記植物またはその部分の照射を含む、
方法。 - 請求項1から4のいずれか一項の方法であって、
前記の植物に突然変異を導入するステップは、前記のニコチアナ植物またはその植物に、
(a)配列番号1のヌクレオチド配列と97%同一性を有するBBLeポリヌクレオチド、
(b)配列番号2のヌクレオチド配列と97%同一性を有するBBLd-1ポリヌクレオチド、および/または
(b)配列番号3のヌクレオチド配列と97%同一性を有するBBLd-2ポリヌクレオチド
を標的化するヌクレアーゼをコードする少なくとも1つの組み換え核酸を導入するステップを含む、
方法。 - 請求項1から6のいずれか一項の方法であって、
前記突然変異は、欠失または挿入である、
方法。 - 請求項6または7の方法であって、
前記ヌクレアーゼは、メガヌクレアーゼ、ジンクフィンガーヌクレアーゼ(ZFN)、転写アクチベーター様エフェクターヌクレアーゼ(TALEN)、および/または、clustered regularly interspaced,short palindromic repeat(CRISPR)関連(Cas)ヌクレアーゼを含む、
方法。 - 請求項1から8のいずれか一項の方法であって、
前記方法は、BBLa、BBLb、BBLc、アスパラギン酸オキシダーゼ、キノリン酸シンターゼ、キノレートホスホリボシルトランスフェラーゼ、オルニチンデカルボキシラーゼ、プトレスシンN-メチルトランスフェラーゼ、メチルプトレスシンオキシダーゼ、およびA622からなる群より選択される、さらなるニコチン性アルカロイド生合成酵素をコードするポリヌクレオチドの発現を低減させるステップをさらに含む、
方法。 - 請求項1から9のいずれか一項の方法であって、
前記方法は、ニコチン性アルカロイド生合成を正に調節する転写因子をコードする少なくとも1つのポリヌクレオチドの発現を低減させるステップをさらに含む、
方法。 - 請求項1から9のいずれか一項の方法であって、
前記方法は、ニコチン性アルカロイド生合成を負に調節する転写因子をコードする少なくとも1つのポリヌクレオチドの過剰発現をさらに含む、
方法。 - 請求項6から11のいずれか一項の方法であって、
前記の少なくとも1つの組み換え核酸は、前記のニコチアナ植物のゲノム中に安定して組み込まれて、
ヌクレアーゼをコードする前記の少なくとも1つの組み換え核酸は、前記ニコチアナ植物を、前記の少なくとも1つの組み換え核酸を含まないニコチアナ植物と戻し交配することによって、前記のニコチアナ植物のゲノムから除去される、
方法。 - 請求項1から12のいずれか一項の方法であって、
導入するステップは、前記突然変異をニコチアナ植物細胞中に導入して、前記植物細胞を植物に再生して、それにより、ニコチン性アルカロイド含有量が低減したニコチアナ植物を生産するステップを含む、
方法。 - 請求項1から13のいずれか一項の方法によって生産される、低減したニコチン性アルカロイド含有量を含む、
ニコチアナ植物または植物部分。 - ニコチン性アルカロイド含有量が低減したニコチアナ植物または植物部分であって、
(a)配列番号1のヌクレオチド配列と97%同一性を有するBBLeポリヌクレオチド、
(b)配列番号2のヌクレオチド配列と97%同一性を有するBBLd-1ポリヌクレオチド、および/または
(c)配列番号3のヌクレオチド配列と97%同一性を有するBBLd-2ポリヌクレオチド
における突然変異を含む、
ニコチアナ植物または植物部分。 - 請求項14または15のニコチアナ植物であって、
前記植物は、BBLa、BBLb、BBLc、アスパラギン酸オキシダーゼ、キノリン酸シンターゼ、キノレートホスホリボシルトランスフェラーゼ、オルニチンデカルボキシラーゼ、プトレスシンN-メチルトランスフェラーゼ、ジアミンオキシダーゼ、およびA622からなる群より選択される、さらなるニコチン性アルカロイド生合成酵素をコードするポリヌクレオチドの低減した発現をさらに含む、
ニコチアナ植物。 - 請求項14から16のいずれか一項のニコチアナ植物であって、
前記植物は、ニコチン性アルカロイド生合成を正に調節する転写因子をコードする少なくとも1つのポリヌクレオチドの低減された発現、および/または、ニコチン性アルカロイド生合成を負に調節する転写因子をコードする少なくとも1つのポリヌクレオチドの増大された発現をさらに含む、
ニコチアナ植物。 - 請求項14から17のいずれか一項のニコチアナ植物の種子であって、
前記種子は、
配列番号1のヌクレオチド配列と97%同一性を有するBBLeポリヌクレオチドにおける突然変異、
配列番号2のヌクレオチド配列と97%同一性を有するBBLd-1ポリヌクレオチドにおける突然変異、および/または、
配列番号3のヌクレオチド配列と97%同一性を有するBBLd-2ポリヌクレオチドにおける突然変異
を含む、
種子。 - 請求項18の種子から生産される、
ニコチアナ植物。 - 請求項14から17または19のいずれか一項の植物から生産される、
ニコチアナ植物の子孫。 - 圃場内に一緒に植えられた、請求項14から17、または19のいずれか一項の複数のニコチアナ植物または請求項20のニコチアナ植物の子孫を含む、
作物。 - 請求項14から17、または19のいずれか一項のニコチアナ植物、請求項20の植物の子孫、または請求項21の作物から生産される、
低減されたニコチン性アルカロイドタバコ産物。 - 請求項22のタバコ産物であって、
前記産物は、葉タバコ、刻みタバコ、切りタバコ、挽きタバコ、粉末タバコ、タバコ抽出物、および、それらの任意の組み合わせからなる群より選択されるタバコの形態から生産される、
タバコ産物。 - 請求項22のタバコ産物であって、
前記産物は、葉タバコ、刻みタバコ、切りタバコ、挽きタバコ、粉末タバコ、タバコ抽出物、無煙タバコ、モイストまたはドライスナッフ、クレテック、パイプタバコ、シガータバコ、シガリロタバコ、シガレットタバコ、チューイングタバコ、ビディ、ビット、およびタバコ含有ガムおよびトローチからなる群より選択される、
タバコ産物。 - 請求項22のタバコ産物であって、
前記産物は、シガリロ、通気孔のない凹所フィルターシガレット、通気孔のある凹所フィルターシガレット、シガー、スナッフ、および、チューイングタバコからなる群より選択される、
タバコ産物。 - 請求項22のタバコ産物であって、
前記タバコ産物は、ブレンドされたタバコ産物、低減されたニコチンタバコ産物、および、それらの任意の組み合わせからなる群より選択される、
タバコ産物。 - 請求項22から26のいずれか一項のタバコ産物であって、
前記産物は、香味成分および/または芳香を含む、
タバコ産物。 - 請求項22から27のいずれか一項のタバコ産物を含む、
タバコ常用中止キット。
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US10405571B2 (en) | 2015-06-26 | 2019-09-10 | Altria Client Services Llc | Compositions and methods for producing tobacco plants and products having altered alkaloid levels |
RU2018123563A (ru) * | 2015-12-04 | 2020-01-09 | Норт Каролина Стейт Юниверсити | Нацеленный мутагенез нуклеиновых кислот, похожих на ферменты бербериновых мостов табака |
US10897925B2 (en) | 2018-07-27 | 2021-01-26 | Joseph Pandolfino | Articles and formulations for smoking products and vaporizers |
US20200035118A1 (en) | 2018-07-27 | 2020-01-30 | Joseph Pandolfino | Methods and products to facilitate smokers switching to a tobacco heating product or e-cigarettes |
BR112022013529A2 (pt) * | 2020-01-08 | 2022-09-06 | Univ North Carolina State | Abordagem genética para alcançar um teor ultrabaixo de nicotina no tabaco |
CN115485386B (zh) * | 2020-04-17 | 2024-03-29 | 日本烟草产业株式会社 | 低生物碱含量的烟草属植物体及其制备方法 |
CN114410677A (zh) * | 2021-11-22 | 2022-04-29 | 云南中烟工业有限责任公司 | 一种利用CRISPR/Cas9敲除NtBBLs创制低烟碱烟草突变体的方法及应用 |
EP4451851A1 (en) * | 2021-12-23 | 2024-10-30 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. | A novel glv-phenolamide: biosynthesis and function in protecting plants from herbivore attack |
WO2023141481A2 (en) * | 2022-01-20 | 2023-07-27 | North Carolina State University | Methods for producing low-nicotine tobacco |
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CN101155920B (zh) * | 2005-02-28 | 2012-09-05 | 二十二世纪有限公司 | 植物中烟碱生物碱的水平的降低 |
US7665472B2 (en) | 2007-11-06 | 2010-02-23 | Alliance One International, Inc. | Tobacco cultivar AOB 175 and products therefrom |
RU2403831C1 (ru) | 2009-07-27 | 2010-11-20 | Государственное научное учреждение Всероссийский научно-исследовательский институт табака, махорки и табачных изделий Российской академии сельскохозяйственных наук (ГНУ ВНИИТТИ Россельхозакадемии) | Способ производства бездымного табачного изделия (снюса) (варианты) |
RU2018123563A (ru) * | 2015-12-04 | 2020-01-09 | Норт Каролина Стейт Юниверсити | Нацеленный мутагенез нуклеиновых кислот, похожих на ферменты бербериновых мостов табака |
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EP3383170A1 (en) | 2018-10-10 |
US10590429B2 (en) | 2020-03-17 |
AU2016362578B2 (en) | 2022-08-04 |
JP2022023088A (ja) | 2022-02-07 |
JP7248337B2 (ja) | 2023-03-29 |
CA3006996A1 (en) | 2017-06-08 |
CN116064641A (zh) | 2023-05-05 |
MX2018006709A (es) | 2019-01-31 |
US20200231980A1 (en) | 2020-07-23 |
MA43388A (fr) | 2018-10-10 |
AU2022218597A1 (en) | 2022-09-15 |
BR112018011050A2 (pt) | 2018-11-21 |
CN108463103A (zh) | 2018-08-28 |
RU2018123563A (ru) | 2020-01-09 |
US20220340920A1 (en) | 2022-10-27 |
WO2017096254A1 (en) | 2017-06-08 |
JP2019503666A (ja) | 2019-02-14 |
US11214813B2 (en) | 2022-01-04 |
US20230323377A1 (en) | 2023-10-12 |
US11753649B2 (en) | 2023-09-12 |
RU2018123563A3 (ja) | 2020-05-15 |
KR20180085794A (ko) | 2018-07-27 |
MX2021014746A (es) | 2022-01-18 |
JP6956084B2 (ja) | 2021-10-27 |
EP3383170A4 (en) | 2019-04-17 |
CN108463103B (zh) | 2022-08-26 |
HK1258848A1 (zh) | 2019-11-22 |
MY198819A (en) | 2023-09-29 |
PH12018501162A1 (en) | 2019-01-21 |
AU2016362578A1 (en) | 2018-07-05 |
US20180346917A1 (en) | 2018-12-06 |
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