JP6735105B2 - ゲムシタビンによる副作用を予測する方法及びdnaチップ - Google Patents
ゲムシタビンによる副作用を予測する方法及びdnaチップ Download PDFInfo
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- JP6735105B2 JP6735105B2 JP2016016031A JP2016016031A JP6735105B2 JP 6735105 B2 JP6735105 B2 JP 6735105B2 JP 2016016031 A JP2016016031 A JP 2016016031A JP 2016016031 A JP2016016031 A JP 2016016031A JP 6735105 B2 JP6735105 B2 JP 6735105B2
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- gemcitabine
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- polymorphism
- dna chip
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Description
(2)上記rs11141915の遺伝子型がTである場合、上記副作用のリスクが高いと予測する(1)記載の方法。
(3)上記rs12046844の遺伝子型がCである場合、上記副作用のリスクが高いと予測する(1)記載の方法。
(4)上記rs11141915及び/又はrs12046844の遺伝子多型を、DNAチップを用いて決定することを特徴とする(1)記載の方法。
(5)上記DNAチップに固定する、rs11141915の遺伝子多型を判定するプローブはATGCCTGGMGGCCCCTG(配列番号1)を含み、rs12046844の遺伝子多型を判定するプローブはGAAACCAACYAAAACCCCT(配列番号2)を含むことを特徴とする(4)記載の方法。
(6)ゲムシタビンによる副作用として、骨髄抑制の発症を予測することを特徴とする(1)記載の方法。
(7)膵臓癌患者における上記遺伝子多型を決定し、当該膵臓癌患者における上記副作用を予測することを特徴とする(1)記載の方法。
(8)担体と、当該担体上に固定されたrs11141915の遺伝子多型に対応する一対のプローブ及び/又はrs12046844の遺伝子多型に対応する一対のプローブとを有する、ゲムシタビンによる副作用を予測するためのDNAチップ。
(9)上記rs11141915の遺伝子多型を判定するプローブはATGCCTGGMGGCCCCTG(配列番号1)を含み、rs12046844の遺伝子多型を判定するプローブはGAAACCAACYAAAACCCCT(配列番号2)を含むことを特徴とする(8)記載のDNAチップ。
プライマー1:5'- GCTCTCCCTGCTTGGTTTAC -3'(配列番号3)及び
プライマー2:5'- CATGCCAAGTCTCTGGTTGC -3'(配列番号4)
からなるプライマーのセットが挙げられる。
プライマー1:5'- AGATAATAGCAGGCCATTGGTTAAT -3'(配列番号5)及び
プライマー2:5'- GAGTCACTTCCTTCCTTCCTGA -3'(配列番号6)
からなるプライマーのセットが挙げられる。
〔実施例1〕
Kiyotani K, et al. A genome-wide association study identifies four genetic markers for hematological toxicities in cancer patients receiving gemcitabine therapy. Pharmacogenet Genomics 2012; 22: 229-235には、rs11141915、rs1901440、rs12046844及びrs11719165の遺伝子型と、ゲムシタビンによる副作用(骨髄抑制)とが相関していると示唆されている。本実施例では、ゲムシタビン副作用予測診断を臨床応用するため、更なる検証試験を実施した。
本実施例では、被験者におけるrs11141915及びrs12046844の遺伝子型を判定できるDNAチップを作製した。なお、本実施例では、rs11141915及びrs12046844に加えて、rs1901440及びrs11719165の遺伝子型もまた判定できるDNAチップを作製した。
ゲムシタビンの副作用と関連するrs11141915及びrs12046844並びにrs1901440及びrs11719165について、各多型を含む領域の塩基配列をNCBI(National Center for Biotechnology Information)のデータベースを利用して取得した。プローブは多型部位を中央とし、5’末端にチミン塩基を付加することで蛍光強度が強くなる知見があったため、これを応用したプローブを設計した。表3に設計したプローブのDNA配列を示した。なお、配列中、多型部位に下線を付した。
DNAチップの基板を作製するために、ダイヤモンドライクカーボン(DLC)上に多価カルボン酸を固定化し、そのカルボキシル基をNHS(N-ヒドロキシスクシンイミド)にて活性エステル化し、ジーンシリコンを作製した。ジーンシリコン上に表3のアミノ基修飾DNAを10μmol/Lで各2点ずつスポットした。スポット後、80℃で1時間加熱し固定化した。ジーンシリコンを室温の2×SSC/0.2%SDSで10分、55〜60℃の2×SSC/0.2%SDSで10分間浸漬後、超純水で3回すすいで洗浄を行った。遠心機にて乾燥させた後、ハイブリプレートにジーンシリコンを移載し、DNAチップを作製した。
DNAの増幅は、表5のPCR液を調製し、表6のサイクルに従いPCRを行った。
得られたPCR産物4μLと2.25×SSC/0.3%SDSを混合した。この混合液3μLを上記で作製したDNAチップに滴下し、ハイブリダイゼーション専用装置(東洋鋼鈑)を用いて54℃で1時間ハイブリダイゼーションした。次に、金属ラック及び染色バットを用いて、0.1×SSC/0.1%SDSに5分浸漬後、1×SSCに浸漬させ10回上下に振とうして洗浄を行った。洗浄後DNAチップにカバーフィルムを被せ、バイオショット(露光時間7秒、温度10.0℃)を用いて蛍光強度を測定した。
国立がん研究センターから供与された17検体について各多型の判定値を測定した結果を図4に示す。図4に示すように各多型において、判定値が3個の群に収束した。群から大きく外れた判定値はなく、判定値の高い群の順にRisk型、Hetero型、Normal型と判別した。
また、国立がん研究センターから供与された171例の検体について、各多型の判定値を測定した結果を図6に示す。また、各多型の判定値の平均値±3σを計算した結果を図7に示した。
Claims (7)
- rs11141915及びrs12046844の遺伝子多型のみを決定することを特徴とするゲムシタビンによる副作用を予測する方法。
- 上記rs11141915の遺伝子型がTである場合、上記副作用のリスクが高いと予測する請求項1記載の方法。
- 上記rs12046844の遺伝子型がCである場合、上記副作用のリスクが高いと予測する請求項1記載の方法。
- 上記rs11141915及びrs12046844の遺伝子多型のみを、DNAチップを用いて決定することを特徴とする請求項1記載の方法。
- 上記DNAチップに固定する、rs11141915の遺伝子多型を判定するプローブはATGCCTGGMGGCCCCTG(配列番号1)を含み、rs12046844の遺伝子多型を判定するプローブはGAAACCAACYAAAACCCCT(配列番号2)を含むとすることを特徴とする請求項4記載の方法。
- ゲムシタビンによる副作用として、骨髄抑制の発症を予測することを特徴とする請求項1記載の方法。
- 膵臓癌患者における上記遺伝子多型を決定し、当該膵臓癌患者における上記副作用を予測することを特徴とする請求項1記載の方法。
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