JP5876481B2 - 超高速核酸精製方法 - Google Patents
超高速核酸精製方法 Download PDFInfo
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- JP5876481B2 JP5876481B2 JP2013515281A JP2013515281A JP5876481B2 JP 5876481 B2 JP5876481 B2 JP 5876481B2 JP 2013515281 A JP2013515281 A JP 2013515281A JP 2013515281 A JP2013515281 A JP 2013515281A JP 5876481 B2 JP5876481 B2 JP 5876481B2
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- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 1
- 125000003438 dodecyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
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- SYJRVVFAAIUVDH-UHFFFAOYSA-N ipa isopropanol Chemical compound CC(C)O.CC(C)O SYJRVVFAAIUVDH-UHFFFAOYSA-N 0.000 description 1
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- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 1
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- C12N15/1003—Extracting or separating nucleic acids from biological samples, e.g. pure separation or isolation methods; Conditions, buffers or apparatuses therefor
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Description
非凝固血液試料から細胞溶解緩衝液(Cell Lysis Buffer)を用いて核酸を抽出した後、シリカ膜(silica membrane)に対する核酸の結合及び分離が可能であるか否かを実験した。
(1)超高速DNA分離
前記実施例1の実験を通じて、非凝固血液試料から溶出された核酸がシリカ膜(silica membrane)に容易に結合し、分離することができることを確認した。また、3種類の細胞溶解緩衝液を用いてDNA成分の核酸を分離する際、クエン酸ナトリウム(sodium citrate)を含有したか否かに関係なく全ての緩衝液で核酸抽出及びシリカ膜への吸着による溶出が可能であるため、実験した3種類の細胞溶解緩衝液からpH7.0の緩衝液Aを選択し、前記結果に基づき超高速の核酸分離のためにペーパークロマトグラフィー法を適用して核酸が分離されたか否かを確認し、標的DNAがPCR増幅したか否かを実験した。
前記実施例2の(1)の方法を用いてシリカ膜に結合された状態で分離したDNAから標的DNAをポリメラーゼ連鎖反応(polymerase chain reaction;PCR)を通じて検出(detection)できるか否かを確認した。
(1)血液試料から全体核酸の分離
病因診断及び分子検出は病因のDNAだけでなくRNAから行われることができる。これはほとんどの分子的診断において非常に重要である。従って、前記実施例2の方法で分離したDNAとRNAを全て含む全体核酸の分離を実験し、分離した全体核酸から標的RNAに対するRT−PCR検出を実験した。通常組織試料から核酸を分離する過程、特に、RNAを分離する過程において、RNA分解酵素(RNase)の汚染によるRNAの分解が標的RNAの検出を困難にし、ポイントオブケア検査においてさらに深刻な問題をもたらす可能性がある。このような核酸分離過程においてRNA分解酵素の汚染を防止し、効果的にDNA及びRNAを分離するために、2−メルカプトエタノールとジチオトレイトール(Dithiothreitol)のような抗酸化化学物質(antioxidant chemical)が使用されるが、この化学物質はRNA分解酵素分子内のジスルフィド結合(disulfide bond)を切断してRNA分解能を不活性化させると知られている。
前記実施例3の(1)の方法でシリカ膜に結合された状態で分離した全体核酸から標的RNA(target RNA)を逆転写酵素−ポリメラーゼ連鎖反応(Reverase transcriptase−PCR、RT−PCR)により検出(detection)できるか否かを確認した。
最近の分子診断はポリメラーゼ連鎖反応(PCR)及び逆転写ポリメラーゼ連鎖反応(RT−PCR)と共にリアルタイム逆転写ポリメラーゼ連鎖反応(Real−time PCR)が標的DNA又はRNAの検出に使用される。
Claims (3)
- ペーパークロマトグラフィー法(paper chromatography)で高純度の核酸を生物学試料から分離する超高速核酸精製方法であって、
1)生物学試料から界面活性剤、チオシアン酸グアニジン(Guanidine thiocyanate)、ラウリルサルコシネートナトリウム(sodium lauryl sarcosinate)および抗酸化化学物質を主成分とする細胞溶解緩衝液によって溶解された核酸をペーパークロマトグラフィー法を用いてシリカ膜(silica membrane)に吸着させる段階と、
2)前記核酸が吸着されたシリカ膜をチオシアン酸グアニジン及びラウリルサルコシネートナトリウムを含有する移動相緩衝液を移動相として一次展開してペーパークロマトグラフィー法を用いて汚染物質を分離する段階と、
3)前記汚染物質が分離されたシリカ膜をエタノール成分を含む核酸洗浄緩衝液を移動相として二次展開して高純度の核酸を得る段階と、
を含み、
前記抗酸化化学物質が2−メルカプトエタノールであることを特徴とする超高速核酸精製方法。 - 前記シリカ膜に吸着された核酸を、シリカ膜を用いた段階的なペーパークロマトグラフィーの展開方法で分離して、高純度の核酸を得ることを特徴とする請求項1に記載の超高速核酸精製方法。
- 前記段階的なペーパークロマトグラフィーの展開方法において、緩衝液の液体移動相を用いて、シリカ膜上に核酸の吸着、汚染物質の分離、及び核酸の精製が段階的に行われることを特徴とする請求項2に記載の超高速核酸精製方法。
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