JP6854024B2 - 反芻動物の妊娠判定方法 - Google Patents
反芻動物の妊娠判定方法 Download PDFInfo
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Description
(2)粘膜上皮細胞を含む試料が、腟から陰門までの生殖器から採取される、(1)に記載の方法。
(3)粘膜上皮細胞を含む試料が、生殖器の表面から低侵襲的又は非侵襲的に採取される、(1)又は(2)に記載の方法。
(4)粘膜上皮細胞を含む試料が、実質的に血液を含まない、(1)〜(3)のいずれか一項に記載の方法。
(5)IFN-τに応答して誘導される分子が、LOC100139670、ISG15、OAS-1X、OAS-1Y、OAS-1Z、OAS-2、UBA7、USP18、Mx1、Mx2、RSAD2、GBP4、GBP5、TNFSF10、STAT1、STAT2及びPLAC8遺伝子よりなる群から選択される少なくとも1の遺伝子から転写されるmRNA又は当該遺伝子にコードされるタンパク質である、(1)〜(4)のいずれか一項に記載の方法。
(6)IFN-τに応答して誘導される分子が、ISG15、OAS-1X、Mx1及びMx2遺伝子よりなる群から選択される少なくとも1の遺伝子から転写されるmRNAである、(1)〜(5)のいずれか一項に記載の方法。
(7)IFN-τに応答して誘導される分子の発現量が、定量PCR法又はLAMP(Loop-Mediated Isothermal Amplification)法により測定される、(1)〜(6)のいずれか一項に記載の方法。
(8)IFN-τに応答して誘導される分子の発現量が、粘膜上皮細胞からのRNAの分離精製処理を行わずに測定される、(1)〜(7)のいずれか一項に記載の方法。
(9)反芻動物が、ウシ、ヒツジ、ヤギ、スイギュウ、ヤク及びシカよりなる群から選択される、(1)〜(8)のいずれか一項に記載の方法。
(10)被験反芻動物の粘膜上皮細胞におけるIFN-τに応答して誘導される分子の発現量を測定するための試薬、及び前記細胞を含む試料を採取するための器具を含む、反芻動物の妊娠を判定するためのキット。
(11)IFN-τに応答して誘導される分子が、LOC100139670、ISG15、OAS-1X、OAS-1Y、OAS-1Z、OAS-2、UBA7、USP18、Mx1、Mx2、RSAD2、GBP4、GBP5、TNFSF10、STAT1、STAT2及びPLAC8遺伝子よりなる群から選択される少なくとも1の遺伝子から転写されるmRNA又は当該遺伝子にコードされるタンパク質である、(10)に記載のキット。
(12)IFN-τに応答して誘導される分子が、ISG15、OAS-1X、Mx1及びMx2遺伝子よりなる群から選択される少なくとも1の遺伝子から転写されるmRNAである、(10)又は(11)に記載のキット。
(13)IFN-τに応答して誘導される分子がmRNAであり、前記分子の発現量を測定するための試薬が核酸増幅法のための試薬である、(10)〜(12)のいずれか一項に記載のキット。
(14)前記細胞を含む試料を採取するための器具が、低侵襲的又は非侵襲的に試料を採取するための器具である、(10)〜(13)のいずれか一項に記載のキット。
1)粘膜の採取
北海道大学北方生物圏フィールド科学センター生物生産研究農場酪農生産研究施設で飼育されているホルスタイン種搾乳牛のうち、後の妊娠鑑定で妊娠が確定した人工授精後18日が経過したウシ及び人工授精を行っていないウシをそれぞれ選び、外陰部を逆性石鹸水溶液で拭いた。直接、あるいは腟鏡を用いて腟前庭を開口し、市販されている計量スプーンを挿入して、子宮頸管及び外子宮口周辺部それぞれから粘膜を掻き取って採取した。採取した試料の目視観察では血液の混入は確認されず、また顕微鏡観察では試料に含まれる細胞の大多数(95%以上)が粘膜上皮細胞であることが確認された。試料を、ISOGEN II(Nippon Gene)500μLを分注して氷冷した1.5 mLチューブに速やかに回収し、-80℃にて凍結保存した。
凍結した粘膜を融解し、ISOGEN IIを500μL加えて混和した。RNase free H2O(Nippon Gene)を200μL加え、15秒間チューブをよく振った。15分間の室温静置の後、4℃、12,000gで15分間遠心し、その上清を1.5 mLチューブに回収した。回収した上清と等量の2-プロパノール(Wako)を加えて転倒混和した後、-30℃で10分間静置した。静置後、4℃、12,000gで10分間遠心し、上清を取り除いた。75%エタノールを各チューブに500μL加えて転倒混和し、4℃、15,000gで5分間遠心した。以上の作業を反復し、上清を取り除いた後10分間真空乾燥し、RNase free H2Oを30μL加えて、total RNAを得た。RNA濃度を測定後、使用時まで-80℃で保存した。
ReverTra Ace(登録商標) q-PCR RT Master Mix with gDNA Remover(TOYOBO)を用いて、total RNAからのcDNA逆転写を行った。この反応に要する加熱および冷却の処理はすべてASTEC ProgramTemp Control System PC-815を用いて行った。得られたtotal RNAとRNase free H2Oを、total RNA濃度が100 ng/12μLとなるように調製し、65℃で5分間熱変性処理を加え、速やかに氷上で冷却した。その後、ゲノム由来のDNAを消化するため、それぞれのチューブに4×DN Master MixとgDNA removerを50:1で混合したものを4μL加え、37℃で5分間加熱し、速やかに氷上で冷却した。次に、それぞれのチューブに5 ×RT Master Mix IIを4μL添加し、37℃15分間、50℃で15分間加熱して逆転写反応を行った後、98℃5分間加熱することで酵素失活反応を行い、cDNAを合成した。得られたcDNAは80μLの滅菌水を加えることで5倍希釈し、使用時まで-30℃で保存した。
子宮外組織における妊娠応答性を評価するための目的遺伝子としてISG15、Mx1、Mx2、OAS-1X及び内部標準遺伝子としてH2AFZをそれぞれ選択した。データベース(NCBI; http://www.ncbi.nlm.nih.gov/)で公開されている各遺伝子の塩基配列を参照して、exon-intron境界領域を含む150bp前後の増幅産物が得られるようにForward及びReverseプライマー(表2)を設計、合成した。
採取器具として計量スプーンに代えて綿棒を用いた点以外は実施例1と同様にして、妊娠牛の子宮頸管、外子宮口周辺部及び腟前庭それぞれから、並びに非妊娠牛の子宮頸管から粘膜を採取した。採取後の綿棒を、ISOGEN II(Nippon Gene)500μLを分注して氷冷した1.5 mLチューブに浸漬して粘膜中の細胞を回収し、実施例1と同様にしてtotal RNAの抽出、逆転写反応によるcDNA合成及びリアルタイムPCRを行った。
実施例1の1)及び2)と同様の方法で採取及び調製した妊娠牛及び非妊娠牛の子宮頸管粘膜由来RNAサンプルについて、total RNA量をそれぞれ100ngに合わせた後にDNase処理を行い、混入DNAを消化した。DNase処理した妊娠牛及び非妊娠牛子宮頸管粘膜由来RNAサンプル各100ng、DNase未処理の妊娠牛及び非妊娠牛子宮頸管粘膜由来RNAサンプル各100ng、並びにDNase未処理の非妊娠牛子宮頸管粘膜由来RNAサンプル1000ngを用いて、直接RTLAMP反応を行った。
反応条件は以下のとおりである。一反応につき滅菌蒸留水2.9μl、反応溶液12.5μl、酵素溶液1μl、ISG15を増幅するように設計されたLAMPプライマーFIP(配列番号13): 40 pmol (0.8μl)、BIP(配列番号14): 40 pmol (0.8μl)、F3(配列番号11): 5 pmol (1μl)、B3(配列番号12): 5 pmol (1μl)を加え、サンプルRNA溶液を5μl加えて最終25μlとし、65℃にて30分以上反応し、ターゲット遺伝子の増幅によって生じた反応物の濁度を継時的な吸光度によって計測した。
Claims (15)
- 妊娠初期に相当する期間にある被験反芻動物の子宮頸管から陰門までの生殖器から採取された粘膜上皮細胞を含む試料を用いて、当該粘膜上皮細胞におけるIFN-τに応答して誘導される分子の発現量を測定する測定工程、及び当該発現量と妊娠していない同種の反芻動物の対応する粘膜上皮細胞における前記分子の発現量とを比較することで被験反芻動物の妊娠を判定する判定工程を含む、反芻動物の妊娠を判定する方法。
- 粘膜上皮細胞を含む試料が、腟から陰門までの生殖器から採取される、請求項1に記載の方法。
- 粘膜上皮細胞を含む試料が、生殖器の表面から低侵襲的又は非侵襲的に採取される、請求項1又は2に記載の方法。
- 粘膜上皮細胞を含む試料が、実質的に血液を含まない、請求項1〜3のいずれか一項に記載の方法。
- IFN-τに応答して誘導される分子が、LOC100139670、ISG15、OAS-1X、OAS-1Y、OAS-1Z、OAS-2、UBA7、USP18、Mx1、Mx2、RSAD2、GBP4、GBP5、TNFSF10、STAT1、STAT2及びPLAC8遺伝子よりなる群から選択される少なくとも1の遺伝子から転写されるmRNA又は当該遺伝子にコードされるタンパク質である、請求項1〜4のいずれか一項に記載の方法。
- IFN-τに応答して誘導される分子が、ISG15、OAS-1X、Mx1及びMx2遺伝子よりなる群から選択される少なくとも1の遺伝子から転写されるmRNAである、請求項1〜5のいずれか一項に記載の方法。
- IFN-τに応答して誘導される分子の発現量が、定量PCR法又はLAMP(Loop-Mediated Isothermal Amplification)法により測定される、請求項1〜6のいずれか一項に記載の方法。
- IFN-τに応答して誘導される分子の発現量が、粘膜上皮細胞からのRNAの分離精製処理を行わずに測定される、請求項1〜7のいずれか一項に記載の方法。
- 反芻動物が、ウシ、ヒツジ、ヤギ、スイギュウ、ヤク及びシカよりなる群から選択される、請求項1〜8のいずれか一項に記載の方法。
- IFN-τに応答して誘導される分子の発現量を測定するための試薬、及び反芻動物の子宮頸管から陰門までの生殖器から粘膜上皮細胞を含む試料を採取するための器具を含む、妊娠初期に相当する期間にある反芻動物の子宮頸管から陰門までの生殖器から採取される粘膜上皮細胞を含む試料を用いて反芻動物の妊娠を判定するためのキット。
- IFN-τに応答して誘導される分子の発現量を測定するための試薬を含む、妊娠初期に相当する期間にある反芻動物の子宮頸管から陰門までの生殖器から採取される粘膜上皮細胞を含む試料を用いて反芻動物の妊娠を判定するためのキット。
- IFN-τに応答して誘導される分子が、LOC100139670、ISG15、OAS-1X、OAS-1Y、OAS-1Z、OAS-2、UBA7、USP18、Mx1、Mx2、RSAD2、GBP4、GBP5、TNFSF10、STAT1、STAT2及びPLAC8遺伝子よりなる群から選択される少なくとも1の遺伝子から転写されるmRNA又は当該遺伝子にコードされるタンパク質である、請求項10又は11に記載のキット。
- IFN-τに応答して誘導される分子が、ISG15、OAS-1X、Mx1及びMx2遺伝子よりなる群から選択される少なくとも1の遺伝子から転写されるmRNAである、請求項10〜12のいずれか一項に記載のキット。
- IFN-τに応答して誘導される分子がmRNAであり、前記試薬が核酸増幅法のための試薬である、請求項10〜13のいずれか一項に記載のキット。
- 前記器具が、低侵襲的又は非侵襲的に試料を採取するための器具である、請求項10又は12〜14のいずれか一項に記載のキット。
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