JP2022551633A - 生物学的試料が肝組織由来であるか否かを判別する方法 - Google Patents
生物学的試料が肝組織由来であるか否かを判別する方法 Download PDFInfo
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- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
- C12Q1/6881—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for tissue or cell typing, e.g. human leukocyte antigen [HLA] probes
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- C—CHEMISTRY; METALLURGY
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- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
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Abstract
Description
(a)対象体(subject)の分離された生物学的試料でDNAを分離する段階;および
(b)前記分離されたDNAで配列番号1および配列番号2で表示される配列のCpG部位のメチル化レベルを測定する段階。
(a)対象体の分離された生物学的試料でDNAを分離する段階;および
(b)前記分離されたDNAで配列番号1および配列番号2で表示される配列のCpG部位のメチル化レベルを測定する段階。
癌遺伝体地図(The Cancer Genome Atlas;以下、TCGAと記載する)から多様な癌腫および正常組織に対するDNAメチル化データをダウンロードした。TCGAでダウンロードしたデータから肝癌組織サンプル(n=379)でメチル化されたCpGサイトを選別し、この中で他の組織の癌腫サンプル(n=7、260)では非メチル化されたCpGサイトを追加的に選別した。この時、基準は50%以上のサンプルでメチル化された場合はメチル化、90%以上のサンプルで非メチル化された場合は非メチル化に分類した。
ランダムフォレスト方法で前記実施例1で発掘した肝組織特異的マーカーの変数重要度プロット(variable importance plot、VarImp Plot)を作成し、これを図2に示した。図2で、X軸のMeanDecreaseAccuracyは、肝組織/その他組織の区分において各マーカーが正確度の改善に寄与する程度、Y軸のMeanDecreaseGiniは、肝組織/その他組織の区分において各マーカーが不純度の改善に寄与する程度を示す。つまり、値が大きいほどそのマーカーが肝組織とその他組織を明確に区分できることを意味する。
最終選別したcg12137206、cg03792768マーカーの肝組織、他の組織でのメチル化レベルを確認した。その結果、図4のAに示すように正常肝組織(Liver N)と肝癌組織(Liver T)の全てにおいて2個のマーカーが高いレベルでメチル化されることが分かり、図4のBに示すように2個のマーカー共にその他癌組織およびその他正常組織ではメチル化レベルが低いことが分かった。
Claims (6)
- (a)対象体(subject)から分離された生物学的試料でDNAを分離する段階;および
(b)前記分離されたDNAで配列番号1および配列番号2で表示される配列のCpG部位のメチル化レベルを測定する段階;
を含む生物学的試料が肝組織起源であるか否かを判別する方法。 - 前記生物学的試料は、対象体から分離された組織、組織断片、細胞、細胞断片、血液、血漿、体液、便および尿からなる群より選択されるものである、請求項1に記載の生物学的試料が肝組織起源であるか否かを判別する方法。
- 前記(b)段階は、PCR、メチル化特異的PCR(methylation specific PCR)、リアルタイムメチル化特異的PCR(real time methylation specific PCR)、MethyLight PCR、MehtyLight digital PCR、EpiTYPER、メチル化DNA特異的結合蛋白質を利用したPCR、定量PCR、DNAチップ、分子ビーコン(molecular beacon)、MS-HRM(Methylation-sensitive high resolution melting)、非対称PCR(asymmetric PCR)、非対称PCR MS-HRMA(asymmetric PCR Methylation-sensitive high resolution melting analysis)、リコンビナーゼ-ポリメラーゼ増幅法(Recombinase Polymerase Amplification)、LAMP法(Loop-Mediated Isothermal Amplification)、Eclipse probe、次世代シークエンシング解析パネル(NGS panel)、パイロシークエンシングおよびバイサルファイトシークエンシングからなる群より選択される方法で行われるものである、請求項1に記載の生物学的試料が肝組織起源であるか否かを判別する方法。
- (a)対象体から分離された生物学的試料でDNAを分離する段階;および
(b)前記分離されたDNAで配列番号1および配列番号2で表示される配列のCpG部位のメチル化レベルを測定する段階;
を含む生物学的試料で肝組織由来DNAを検出する方法。 - 配列番号1および配列番号2で表示される配列のメチル化レベルを測定することができる試薬を含む、生物学的試料が肝組織起源であるか否かの判別用組成物。
- 前記メチル化レベルを測定することができる試薬は、配列番号1および配列番号2で表示される配列のCpG部位に結合するプライマー、プローブまたはアンチセンス核酸である、請求項5に記載の生物学的試料が肝組織起源であるか否かの判別用組成物。
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