JP2012508564A - ブラキスピラ・ヒオディセンテリアのワクチン株 - Google Patents
ブラキスピラ・ヒオディセンテリアのワクチン株 Download PDFInfo
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Abstract
【解決手段】本発明は、一般にはブラキスピラ・ヒオディセンテリアのワクチン株に関する。詳細には、本発明は、一以上の病原性因子を有しないB.ヒオディセンテリアの単離生ワクチン株に関する。また、本発明は、ワクチン株を確認及び調製する方法にも関すると共に、下痢性疾患に対するワクチン組成物、及び該疾患を診断するための方法及びキットにも関する。
【選択図】図5
Description
ゲノム配列決定
B.ヒオディセンテリアのオーストラリアブタ野外単離株(WA1株)に対してショットガン配列決定を行った。この株は十分に特性化されており、ブタに対して実験的投与の結果、病原性であることが判明している。このスピロヘータを嫌気性トリプチケースソイブロス培地中で生育させ、臭化セチルトリメチルアンモニウム(CTAB)法を用いて100μgのDNAを抽出し、ゲノムDNAライブラリーの調製に適した高品質で高分子量のDNAを調製した。GeneMachines(登録商標) Hydroshear(登録商標)を用いてゲノムDNAを剪断し、得られたDNA断片をpSMARTベクターシステム(ルシジェン)の供給元が推奨するプロトコール通りに処理してクローニングを行った。小型挿入(2〜3kb)ライブラリー及び中型挿入(3〜10kb)ライブラリーを構築し、低コピー型のpSMARTベクターとし、AB 3730DNAシークエンサーを用いてランダムクローンの配列決定を行い、少なくとも8倍のゲノム被覆率を得る。更にゲノム配列決定を終了させるため、ゲノムDNAから平均挿入サイズが500bpのRoche GS−FLX用ショットガンライブラリーを調製した。Roche GS−FLX DNAシークエンサーを用いて、このライブラリーから得たランダムクローンの配列決定を行った。最後に、連結されていない隣接配列間を移動するプライマーを用いてゲノム配列決定を終了させた。
[実施例2]
オーストラリアゲノム研究施設(AGRF)(クイーンズランド州)及び比較ゲノム解析センター(CCG)(マードック大学)によってB.ヒオディセンテリアの全ゲノム配列が整理され注釈付けられた。種々の公有のバイオインフォマティクスツールを用いて、データ解析上の品質保証手続きの一部として当該配列を解析及び再解析した。読み取り枠(オープンリーディングフレーム(ORFs))は、GeneMarkやGLIMMER、ORPHEUS、SELFID、GetORF等の種々のプログラムを用いて予測した。推定ORFsは、BLASTやFASTA等のサーチを用いて既存の国際データベースとの相同性(DNA及びタンパク質)について調べる。系統発生や他の分子進化解析は同定された遺伝子及び他の種を用いて行い、機能の割り当てを補助した。部分配列決定ゲノムのインシリコ解析によって、入手し得る配列データに存在する予測ORFs全ての包括的リストが得られた。
[実施例3]
本解析に用いた特注のジーンチップ(GeneChips)は、B.ヒオディセンテリアゲノム及びプラスミド配列から得た予測ORFsを用いてアフィメトリクス社によって設計、製造されている。当該ゲノム上にコードされている2551個のORFsの内、1718個の遺伝子がジーンチップ(GeneChips)に示され、プラスミド上にコードされている32個のORFsの内、25個が当該チップに示される。マイクロアレイベースの比較ゲノムハイブリダイゼーション(CGH)解析を用い、6種の高病原性B.ヒオディセンテリア株(B204、BW1、Vic2、NSW5、NSW15及びQ17)及び8種の低病原性株(B234、SA2206、VS1、A1、B78T、R301、B6933及びFM88.90)の遺伝子量とB.ヒオディセンテリア株WA1(すなわち、高病原性株)の遺伝子量とを比較した。上述の病原性株は、実験的に感染させたブタや自然感染したブタにおいて重篤なSDの臨床徴候を引き起こすことが報告されている。上述の非病原性株は、有意なSDの臨床徴候を引き起こすことなくブタにコロニー形成することが報告されている。DNeasy Blood and Tissue Kit(キアゲン社)を用い、製造業者の指示に従ってB.ヒオディセンテリア細胞から高分子量DNAを抽出した。精製した高分子量DNAを制限酵素Rsalで切断し、BioPrime Array CGH Genomic Labeling System(インビトロジェン社)を用い、製造業者の指示に従って、得られた制限断片を蛍光シアニン色素(Cy3)で標識した。標識したゲノム断片をB.ヒオディセンテリアGeneChipにHybridisation Oven 645(アフィメトリクス社)にて中程度にストリンジェントな条件(37℃)下で16時間ハイブリダイズした。ジーンチップ(GeneChip)を洗浄し、GeneChip Hybridisation,Wash and Stain Kit(アフィメトリクス社)を用い、製造業者の指示に従って標識した。Fluidics Station 450(アフィメトリクス社)を用い、ジーンチップ(GeneChip)の洗浄及び染色を行った。最後に、ハイブリダイズしたジーンチップ(GeneChip)をScanner 3000(アフィメトリクス社)を用いてスキャンし、GeneChip Operating Software(GCOS、アフィメトリクス社)を用いて合成画像を解析した。
[実施例4]
B.ヒオディセンテリア株WA1細胞を、嫌気性トリプチケースソイブロス培地中で対数期の中間部まで増殖させた。30μg/mLの臭化エチジウムを含む嫌気性トリプチケースソイブロスで細胞を段階的に希釈し、嫌気性条件下、振盪させながら37℃で3日間維持した。最も高い段階希釈から得た生存可能な培養物を30μg/mLの臭化エチジウムを含む嫌気性トリプチケースソイブロス培地で段階的に希釈し、同一条件下、37℃で3日間維持した。このプロセスをあと9回繰り返し、最終継代後、スピロヘータを洗浄して臭化エチジウムを除去し、偏好性嫌気性寒天(LabM)プレート上に蒔いて単一コロニーを得た。
[実施例5]
臭化エチジウム含有液体培地中の継代によって得た単一コロニーをPCRでスクリーニングしてプラスミドの欠如を確認した。ORFs11〜16を標的とする3種類のプライマー対をスクリーニングプロセス用に設計する(図3)。計48個のコロニーをTris−EDTAバッファー中に細胞採取し、6個のプライマーセットの各々を用いたPCR反応において鋳型として添加した。HotStarTaq DNAポリメラーゼ(キアゲン社)を用い、製造業者の指示に従ってPCR反応を行った。野生型B.ヒオディセンテリアWA1株においては全てのPCR産物が存在したのに対し、プライマーセット全てにおいてはPCR産物が存在しなかったことから、プラスミドの除去が成功したことが分かった。
[実施例6]
体重が約18kgの36匹の去勢した雄ブタ(ラージホワイト×ランドレース×デュロック)をブタ赤痢のない商業養豚場から購入した。各ブタについて計量を行い、耳にタグを付け、糞便サンプルを採取し、培養してブラキスピラ・ヒオディセンテリアの存在可能性を排除した。これらのブタをランダムに次の2グループに割り当てた。
i)グループA:病原性B.ヒオディセンテリア株WA1、すなわち、上述の実施例3で確認された病原性因子(ORFs11〜16)を含む株で攻撃感染させられた12匹のブタ、及び
ii)グループB:上述の実施例3で確認された病原性因子(ORFs11〜16)を含まず、まだ特性化されていないB.ヒオディセンテリアの野外株(すなわち、非病原性であると予測される株)で攻撃感染させられた24匹のブタ。
[実施例7]
5%(v/v)の脱繊維素ヒツジ血液、400ug/mLのスペクチノマイシン、25ug/mLのコリスチン及び25ug/mLのバンコマイシンを含有するトリプチケースソイ寒天プレート上に細菌試験用綿棒で画線した。このプレートを好気環境下、39℃で7日間インキュベートした。強いβ溶血及び微視的形態に基づき、スピロヘータはB.ヒオディセンテリアとして同定された。分離株の一部は継代培養し、種特異的PCRによってB.ヒオディセンテリアであることを確認した。
[実施例8]
マイクロタイタープレートを、炭酸緩衝液(pH9.6)中の1ウェルあたり100μLの超音波処理が施され、かつ清澄されたB.ヒオディセンテリア全細胞を(1μg/mL)でコーティングした。細胞は上述の各々の感染に用いた同一株から得た。コーティングは4℃で一晩行った。プレートは、PBS−BSA(1%w/v)を150μL添加し、室温(RT)で1時間混合した後、150μLのPBST(0.05%v/v)で3回洗浄してブロックされた。ブタ血清を100μLのPBST−BSA(0.1%w/v)にて400倍に希釈し、混合しながら室温(RT)で2時間インキュベートした。プレートを洗浄した(上述の通り)後、PBST−BSA(0.1%w/v)にて50,000倍に希釈したヤギ抗ブタIgG(全分子)−HRP(100μL)を添加した。室温(RT)で1時間インキュベートした後、プレートを洗浄し、100μLのTMB基質を添加した。室温(RT)で10分間発色を行った後、100μLの500mM硫酸を添加して発色を停止させた。各ウェルの吸光度を450nmで読み取った。
Claims (19)
- B.ヒオディセンテリアの単離生ワクチン株であって、一以上の病原性因子を有しない前記ワクチン株。
- 前記病原性因子は、配列番号1、配列番号2、配列番号3、配列番号4、配列番号5又は配列番号6に記載の核酸配列の一以上と実質的に類似する一以上のポリヌクレオチド配列によってコードされる、請求項1に記載の株。
- B.ヒオディセンテリアの単離生ワクチン株であって、配列番号1、配列番号2、配列番号3、配列番号4、配列番号5又は配列番号6に記載の核酸配列の一以上と実質的に類似する一以上のポリヌクレオチド配列によってコードされる一以上の機能的病原性因子を有しないB.ヒオディセンテリアのワクチン株。
- B.ヒオディセンテリアの単離生ワクチン株は弱毒病原性株であり、当該株は、病原性因子を弱毒化する改変を含み、防御的な免疫原性であるような免疫原性特性を保持しているが、もはや病原性ではない、請求項1〜3のいずれか1項に記載の株。
- 前記改変によって、配列番号1、配列番号2、配列番号3、配列番号4、配列番号5又は配列番号6、又はその組合せに記載の核酸配列の一以上と実質的に類似する一以上のポリヌクレオチド配列からのmRNA発現が低下又は抑制される、請求項4に記載の株。
- 前記改変によって一以上の非機能的産物が翻訳される(「機能的産物」とは、配列番号7、配列番号8、配列番号9、配列番号10、配列番号11又は配列番号12に記載のアミノ酸配列の一以上と実質的に類似する一以上のポリペプチド配列によってコードされるものである)、請求項4に記載の株。
- 一以上のポリヌクレオチド配列はプラスミド由来である、請求項2〜6のいずれか1項に記載のワクチン株。
- 前記改変は、B.ヒオディセンテリアから前記プラスミドを除去することによって生じる、請求項8に記載のワクチン株。
- B.ヒオディセンテリアの生ワクチン株を調製する方法であって、
(a)病原性B.ヒオディセンテリア株を選択することと、
(b)前記病原性B.ヒオディセンテリア株において改変をもたらして生弱毒病原性B.ヒオディセンテリア株を得ることと、
(c)前記改変を含む生弱毒病原性B.ヒオディセンテリア株を単離することと、
(d)前記単離B.ヒオディセンテリア株を選択することを含み、ここで、前記選択されたB.ヒオディセンテリア株は、防御的な免疫原性であるような免疫原性特性を保持している方法。 - 請求項1〜8のいずれか1項に記載の少なくとも1種のB.ヒオディセンテリアのワクチン株を薬学的に許容し得る媒体内に含むワクチン組成物。
- アジュバントを更に含む、請求項10に記載のワクチン組成物。
- 動物における下痢性疾患を予防する方法であって、請求項1〜8のいずれか1項に記載の少なくとも1種のB.ヒオディセンテリアのワクチン株、又は請求項10又は11に記載のワクチン組成物の有効量を前記動物に投与することを含む方法。
- 動物内での病原性B.ヒオディセンテリアのコロニー形成を診断する方法であって、
(a)前記動物からサンプルを得る工程と、
(b)配列番号1、配列番号2、配列番号3、配列番号4、配列番号5又は配列番号6に記載の核酸配列の一以上と実質的に類似する一以上のポリヌクレオチド配列の有無、及び/又は対応するmRNA又はコードされるタンパク質産物の発現を確認する工程とを含み、ここで、前記核酸又は対応するmRNA又はタンパク質産物の存在は、前記動物内での病原性B.ヒオディセンテリアのコロニー形成の存在を示す方法。 - 動物内での病原性B.ヒオディセンテリアのコロニー形成を診断するためのキットであって、配列番号55〜90に記載の核酸配列の一以上と実質的に類似するポリヌクレオチド配列を有する一以上のPCRプライマーを含むキット。
- B.ヒオディセンテリアの病原性を阻害することが可能な化合物をスクリーニングする方法であって、
(a)配列番号1、配列番号2、配列番号3、配列番号4、配列番号5又は配列番号6に記載の核酸配列の一以上と実質的に類似する一以上のポリヌクレオチド配列を有するDNA構築物で細胞をトランスフェクトすることと、
(b)前記トランスフェクトされた細胞を候補化合物に接触させることと、
(c)前記核酸分子の一以上からのmRNA発現のレベル、又は前記mRNA発現によってコードされるタンパク質のレベルを比較することを含み、ここで、前記タンパク質は、候補化合物の存在下及び非存在下で、細胞内に配列番号7、配列番号8、配列番号9、配列番号10、配列番号11又は配列番号12に記載のアミノ酸配列の一以上と実質的に類似するポリペプチド配列を有し、(d)候補化合物が存在しないときと比べて、存在するときにmRNA及び/又はタンパク質の発現が有意に低い場合には、候補化合物がB.ヒオディセンテリア病原性の阻害剤であることを推測することを含む方法。 - B.ヒオディセンテリアの病原性を阻害することが可能な化合物をスクリーニングする方法であって、
(a)配列番号1、配列番号2、配列番号3、配列番号4、配列番号5又は配列番号6に記載の核酸配列の一以上と実質的に類似する一以上のポリヌクレオチド配列の転写制御配列又はプロモーターと作用的に連結されたレポーター遺伝子をコードするDNA構築物で細胞をトランスフェクトすることと、
(b)前記トランスフェクトされた細胞を候補化合物に接触させることと、
(c)候補化合物の存在下及び非存在下で細胞におけるレポーター遺伝子発現のレベルを比較すること、
(d)候補化合物が存在しないときと比べて、存在するときにレポーター遺伝子の発現が有意に低い場合には、候補化合物がB.ヒオディセンテリア病原性の阻害剤であることを推測することを含む方法。 - 請求項1に記載の少なくとも1種のワクチン株を含む、B.ヒオディセンテリア感染を予防するのに用いる医薬の製造におけるB.ヒオディセンテリアのワクチン株の使用。
- B.ヒオディセンテリア感染に対する動物のワクチン接種のためのキットであって、
(a)請求項1に記載の少なくとも1種のワクチン株を薬学的に許容し得る媒体内に含むワクチン組成物と、
(b)動物にワクチン接種するための説明書とを含むキット。 - B.ヒオディセンテリアの候補ワクチン株を確認する方法であって、
(a)B.ヒオディセンテリアのサンプルを得る工程と、
(b)配列番号1、配列番号2、配列番号3、配列番号4、配列番号5又は配列番号6に記載のポリペプチド配列によってコードされる核酸配列の一以上の有無、及び/又は対応するmRNA又はタンパク質産物の発現を確認する工程を含み、ここで、前記核酸の欠如、又は対応するmRNA又はタンパク質の発現の欠如は、B.ヒオディセンテリアのワクチン株であることを示す方法。
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AU2008905922A AU2008905922A0 (en) | 2008-11-14 | Vaccine strains of brachyspira hyodysenteriae | |
AU2008905922 | 2008-11-14 | ||
US11550908P | 2008-11-17 | 2008-11-17 | |
US61/115,509 | 2008-11-17 | ||
PCT/AU2009/001482 WO2010054437A1 (en) | 2008-11-14 | 2009-11-13 | Vaccine strains of brachyspira hyodysenteriae |
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US (1) | US9011878B2 (ja) |
EP (1) | EP2352518A4 (ja) |
JP (1) | JP2012508564A (ja) |
KR (1) | KR20110092306A (ja) |
CN (1) | CN102281893A (ja) |
AU (1) | AU2009316239B2 (ja) |
BR (1) | BRPI0921027A8 (ja) |
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US8992938B2 (en) * | 2007-08-03 | 2015-03-31 | Matthew Bellgard | Genes and proteins of Brachyspira hyodysenteriae and uses thereof |
DK2935314T3 (da) | 2012-12-21 | 2022-08-15 | Boehringer Ingelheim Vetmedica Gmbh | Nye rekombinante ydre membranproteiner fra Brachyspira hyodysenteriae og anvendelser deraf |
ES2828873T3 (es) * | 2013-06-28 | 2021-05-27 | Aquilon Cyl S L | Vacuna contra la disentería porcina |
US10188715B2 (en) | 2013-06-28 | 2019-01-29 | Aquilon Cyl Sociedad Limitada | Swine dysentery vaccine |
KR20180094116A (ko) * | 2016-01-07 | 2018-08-22 | 유니버시테이트 젠트 | 브라키스피라 하이오디센테리애의 백신 균주 |
AU2018200954B2 (en) * | 2017-03-23 | 2018-11-22 | Australasian Pork Research Institute Ltd | Live Vaccine Strains |
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WO1998020899A1 (en) * | 1996-11-12 | 1998-05-22 | Board Of Regents University Of Nebraska Lincoln | Attenuated serpulina hyodysenteriae mutant for prevention of swine dysentery |
US5882655A (en) * | 1991-12-23 | 1999-03-16 | American Cyanamid Company | Serpulina hyodysenteriae vaccine comprising a hygene mutant |
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US6682745B1 (en) * | 1998-07-28 | 2004-01-27 | Christiaan Antonius Arnoldus Jacobs | Use of bacterium for manufacture of a vaccine |
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US5882655A (en) * | 1991-12-23 | 1999-03-16 | American Cyanamid Company | Serpulina hyodysenteriae vaccine comprising a hygene mutant |
WO1998020899A1 (en) * | 1996-11-12 | 1998-05-22 | Board Of Regents University Of Nebraska Lincoln | Attenuated serpulina hyodysenteriae mutant for prevention of swine dysentery |
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EP2352518A4 (en) | 2013-07-10 |
AU2009316239A1 (en) | 2010-05-20 |
EP2352518A1 (en) | 2011-08-10 |
CN102281893A (zh) | 2011-12-14 |
AU2009316239B2 (en) | 2017-10-19 |
CA2743660A1 (en) | 2010-05-20 |
MX2011005135A (es) | 2011-10-24 |
WO2010054437A1 (en) | 2010-05-20 |
US20110293661A1 (en) | 2011-12-01 |
BRPI0921027A2 (pt) | 2015-12-29 |
US9011878B2 (en) | 2015-04-21 |
KR20110092306A (ko) | 2011-08-17 |
BRPI0921027A8 (pt) | 2017-09-19 |
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