JP4395070B2 - 潰瘍性大腸炎を診断するための方法およびキット - Google Patents
潰瘍性大腸炎を診断するための方法およびキット Download PDFInfo
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Description
従来技術によれば、IBDの型を識別する、特にUCとCDとを識別する利用可能な方法は、上述の様々な試験方法の例を除いて、抗体に基づく方法に焦点を合わせていることが示されている。
本発明は、添付の図面を参照しながら、以下の詳細な説明および実施例でより詳細に説
明される;
図1は、潰瘍性大腸炎(UC)またはクローン病(CD)のいずれかに罹った患者からの生検サンプルにおける、7種のマーカー遺伝子の発現状態のRT−PCR分析を示す。実験プロトコールを実施例6で概説する。(記号:Mは、塩基対マーカー、Hは、全体的に正常で健康な個体からの生検を示し、Iは、炎症を起こした領域から採取した生検サンプルを示し、Nは、同じ患者の炎症を起こしていない領域から採取した生検を示す。図の下部の数字は患者数を示し、縦の黒い線は、同じ患者から得られたNおよびIの生検サンプルを示す)。ガンマアクチンをローディングコントロールとして用いたが、これは、全てのRT−PCR反応で等しいmRNA投入量を実証するのに一般的に用いられるハウスキーピング遺伝子の発現状態を示す。
本発明を開示および説明する前に、当業者であれば、本発明は、目的を実行し、上述の結果および利点が得られるように、同様に、本発明に固有の目的を実行し、その結果および利点が得られるようにうまく改変されることは容易に理解し得る。本発明の実施例、同様に、本発明で説明される方法、手順、治療、分子、および、特定の化合物は、現状での好ましい実施形態の典型であり、代表であって、本発明の範囲を限定するような意図はない。当業者が考慮し得るそれらへの変化およびその他の用途は、特許請求の範囲で定義された本発明の本質に包含される。
)により説明されているような当業者既知の分析によって測定することができる。
その他の検出方法により検出することができる。
から選択される少なくとも2つのマーカー遺伝子に向けられた遺伝子特異的プライマー対を含む。
CDまたはUCの炎症状態を有する臨床的および病理学的な証拠に基づき選択された患者から生検を採取した。一人の患者の結腸の炎症を起こした部位から、トータルで3つの生検を、炎症を起こしていない領域からの3つの生検サンプルと共に収集した。これをトータルで16人の異なる患者に行い、ここで、16人のうち8人はCDと診断されており(患者1〜8)、残りの8人はUCと診断されている(患者9〜16)。UC患者群は、女性2人および男性6人からなり、年齢の範囲は29〜77歳であった。同様に、CD患者群は、女性3人および男性5人からなり、年齢の範囲は27〜59であった。
、ペレット・ペステル(Pellet Pestel)のモーターホモジナイザーを製造元のプロトコ
ールに従って用いてトータルRNAを単離した。この方法で、トータルRNAを、患者1人あたり2サンプル(炎症を起こした(標的)、および、炎症を起こしていない(コントロール))で、計32サンプルを単離した。
各RNAサンプル(トータルで32)の2μgを、第一の鎖のcDNA合成で用いて、10pMのオリゴ−dT−プライマーdT−ジョイント(5’−TAG TCT ATG
ATC GTC GAC GGC TGA TGA AGC GGC CGC TGG
AGT TTT TTT TTT TTT TTT TTV−3’(配列番号8)を用いて、各合成cDNA分子に3種の制限酵素切断部位:SalI、NotIおよびBpmIを導入した。緩衝液、デゾキシヌクレオチド三リン酸(dATP、dCTP、dGTPおよびdTTP)、および、酵素の逆転写酵素(スーパースクリプト(Superscript)II)は、ギブコ・BRL(Gibco BRL)から購入し、製造元のガイドラインに従って反応を行った。酵素を除く第一の鎖の合成のための反応混合物を、PCR機(PCRスプリント(PCR sprint),Hybaid製)で、65℃で5分間プレインキュベートし、氷上で冷却し、次に、42℃に予備加熱し、その後、酵素スーパースクリプトIIを加え、PCR機(PCRスプリント,Hybaid製)で、42℃で1時間インキュベートした。
このような生検から得られた材料の量は限定されているため、予備増幅工程が必要であった。cDNAの3’末端をインビトロで増幅するため、各サンプルからのcDNA(26μl)を、体積30μlで、制限酵素Dpn II(10U)で、37℃で3時間消化した。切断されたcDNAを、キアゲンPCR精製キットを用いて1回以上精製し、cDNAを溶出緩衝液(47μl)中で溶出させた。以下の環化ライゲーション工程を、Dpn IIで切断したcDNA(44μl)と、2000UのT4DNAリガーゼ(ニューイングランドバイオラボ)を含む体積50μlで行った。これら反応混合物を22℃で1時間インキュベートし、65℃で10分間加熱して不活性化し、各反応混合物の25μlを増幅工程で用いた。1サンプルあたり5回の反応混合物を一つに合わせ(5×50μl=トータルで250μl)、これには、25μlのcDNA(Dpn IIで切断し環状にライゲートした)、25μlの10×アドバンテージ(Advantage)2PCR緩衝液(クロンテック(Clontech))、5μlのジョイント−Notプライマー(10pモル/μl;5’−TGA TGA AGC GGC CGC TGG−3’(配列番号9))、5μlのジョイント−Salプライマー(10pモル/μl;5’−TTC ATC AGC CGT CGA CGA TC−3’(配列番号10)、5plの10mM dNTPミックス、および、5μlの50×アドバンテージ2Taq−ポリメラーゼ(クロンテック)が含まれる。各サンプルに、このミックスを5個のPCR反応チューブに分配し、以下の条件下でPCRを行った:94℃で1分間、次に、16×(94℃で20秒間、55℃で20秒間、72℃で1分間)。
差別的に発現されたcDNAの単離を、von Stein O.D.,2001年で概説されたプロトコールに従って行った(多少のプロトコール改変を含む)。
cDNAライブラリー構築において、各サブトラクションから2.000個のクローン
を、1個の22cm2寒天プレートにプレーティングした。これらプレートから、384
個のコロニーをピックアップし、バイオロボティクス(バイオロボティクス)(ケンブリッジ,UK)のバイオピック(BioPick)機を用いて、ウェルあたり70μlのLB培地を含む384ウェルのプレートに撒いた(Maniatis等,Molecular cloning laboratory book, Appendix A.1を参照)(+アンピシリン100mg/ml)。細菌クローンを37℃で一晩インキュベートし、次に、コロニーPCRで用いた。このPCRは、384PCRウェルプレートで、1サンプルあたり体積20μlで行われた。1つのPCR反応は、10×PCR緩衝液(2μl)、0.4μlのSport-Notプライマー(10pモルの5’−CGT AAG CTT GGA TCC TCTAGA GC−3’(配列番号11)、0.4μlのSport−Salプライマー(10pモルの5’−TGC AGG TAC CGG TCC GGA ATT CC−3’(配列番号12))、1.6μlのdNTPミックス(各25mM)、0.4μlの0.1%ブロモフェノールブルー、および、0.5μlのDynAzyme Taq−ポリメラーゼ(2U/μl;フィンザイム)を含む。全反応液のためのマスターミックスを製造し、分配し、次に、384個のプラスチック製レプリカで播種した。PCRサイクルパラメーターは、以下の通りである:94℃で2分間、37回(94℃で30秒間;50℃で30秒間、72℃で1分間)、および、72℃で5分間。
これらの分析で、数種の遺伝子が強い調節障害を示した。これらのデータを確認するために、遺伝子特異的オリゴヌクレオチドと、同じ8人の患者から得られた非増幅cDNA材料を用いてRT−PCRを行った。炎症を起こした組織、および、炎症を起こしていない組織(サブトラクションで用いらたものと同じ)の、およそ2μgのトータルRNAが、実施例5で説明された第一の鎖cDNA合成のために採取された。cDNA合成後、サンプルを96℃で3分間インキュベートし、次に、蒸留水で1:10に希釈した。
8人のUC患者と3人のCD患者のcDNAを用いたRT−PCRの予備的な結果(実施例6を参照)を確認するために、全ての単離された遺伝子の発現を大規模に分析することを決定した。その目的のために、スクリーニングで単離され得る全ての遺伝子を、ハイボンドN+メンブレン(アマシャム)に、マイクログリッドTAS(バイオロボティクス)を用いてスポットした。実施例5で説明したように、スポットのために、遺伝子をコロニーPCRで増幅した。
より大きい統計学的な重要性を提供するために、その生検がUCまたはCDに罹った患者から得られたものかどうかがわかっていない「盲目」生検サンプルで7種の遺伝子マーカーの発現分析を行うことが必要であった。上述したように、前記遺伝子マーカーのRT−PCR分析を行い、前記遺伝子マーカーから得られた発現パターンの全画像を総合したところ、90%超の確実性で正しいIBD型の決定が可能であった。
が得られたが、配列番号1、2および3の組み合わせ、または、配列番号1、2および4の組み合わせでさらに改善された結果が得られたことが示された。予備的な結果により、配列番号1,2,3および4の組み合わせを用いたところ約90%の精度が達成されたことが示された。配列番号1〜7の完全なセットを用いたところ、90%超の精度が得られたことが示された。
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Claims (11)
- 患者の腸から得られた1つまたはそれ以上のサンプルの遺伝子発現プロファイルの分析に基づく潰瘍性大腸炎とクローン病とを識別する方法であって、多数のマーカー遺伝子のうち少なくとも2種の発現レベルが測定され、少なくとも2種の上記のマーカー遺伝子は、配列番号1および配列番号2であり、そして前記1つまたはそれ以上のサンプルは炎症を起こした組織からのサンプル、または炎症を起こした組織からのサンプルと炎症を起こしていない組織からの別のサンプルであり、ここで配列番号1の炎症を起こした組織での発現を、配列番号2の炎症を起こした組織での発現の欠如と共に、潰瘍性大腸炎の指標として取扱うことを特徴とする、上記方法。
- 配列番号1と配列番号2との発現レベルを測定し、配列番号1の炎症を起こした組織での発現、および炎症を起こしていない組織での発現の欠如を、配列番号2の炎症を起こした組織での発現の欠如と共に、潰瘍性大腸炎の指標として扱う、請求項1に記載の方法。
- 配列番号1、配列番号2および配列番号3の発現レベルを測定し、配列番号1の炎症を起こした組織での発現を、配列番号2の炎症を起こした組織での発現の欠如、および、配列番号3の炎症を起こした組織での発現と共に、潰瘍性大腸炎の指標として扱う、請求項1記載の方法。
- 配列番号1、配列番号2および配列番号3の発現レベルを測定し、配列番号1の炎症を起こした組織での発現、および炎症を起こしていない組織での発現の欠如を、配列番号2の炎症を起こした組織での発現の欠如、および、配列番号3の炎症を起こした組織での発現、および炎症を起こしていない組織での発現の欠如と共に、潰瘍性大腸炎の指標として扱う、請求項1記載の方法。
- 配列番号1、配列番号2および配列番号4の発現レベルを測定し、配列番号1の炎症を起こした組織での発現を、配列番号2の炎症を起こした組織での発現の欠如、および、配列番号4の炎症を起こした組織での発現と共に、潰瘍性大腸炎の指標として扱う、請求項1記載の方法。
- 配列番号1、配列番号2および配列番号4の発現レベルを測定し、配列番号1の炎症を起こした組織での発現、および炎症を起こしていない組織での発現の欠如を、配列番号2の炎症を起こした組織での発現の欠如、および、配列番号4の炎症を起こした組織での発現、および炎症を起こしていない組織での発現の欠如と共に、潰瘍性大腸炎の指標として扱う、請求項1記載の方法。
- 配列番号1〜7の発現レベルを測定し、配列番号1、3、4、5、6および7の炎症を起こした組織での発現または炎症を起こした組織での優先的な発現を、配列番号2の炎症を起こした組織での発現の欠如と共に、潰瘍性大腸炎の指標として扱う、請求項1記載の方法。
- 配列番号1〜7の発現レベルを測定し、配列番号1、3、4、5、6および7の炎症を起こした組織での発現または炎症を起こした組織での優先的な発現、および炎症を起こしていない組織での発現の欠如を、配列番号2の炎症を起こした組織での発現の欠如と共に、潰瘍性大腸炎の指標として扱う、請求項1記載の方法。
- 遺伝子特異的プライマーを用いて前記遺伝子の核酸を増幅させ、増幅結果を測定することにより、前記各マーカー遺伝子の発現レベルを測定する、請求項1〜8のいずれか一項に記載の方法。
- 核酸の増幅は、PCRと、配列番号13〜26から選択される遺伝子特異的プライマーを用いて行われる、請求項9に記載の方法。
- 増幅結果の測定は、エチジウムブロマイド染色とUV光下での可視化を用いて行われる、請求項9に記載の方法。
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EP1844158A4 (en) * | 2004-12-06 | 2010-09-08 | Univ Johns Hopkins | BIOMARKERS FOR INFLAMMATORY INTESTINAL DISEASE |
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EP2148943B1 (en) * | 2007-04-30 | 2016-10-05 | Janssen Biotech, Inc. | Methods for assessing and treating ulcerative colitis and related disorders using a 19 gene panel |
CN101815945A (zh) * | 2007-08-02 | 2010-08-25 | Iss免疫系统刺激股份公司 | 炎性肠病的诊断、分期和监测 |
WO2009030482A1 (en) * | 2007-09-05 | 2009-03-12 | Universitätsklinikum Heidelberg | In vitro model for inflammatory diseases of the gut mucosa |
EP2223121B1 (en) * | 2007-12-20 | 2012-07-25 | Index Diagnostics AB (publ) | Method and kit for use in the differentiation of ibd and ibs and further distinction between disease types of ibd |
ES2445892T3 (es) * | 2008-08-25 | 2014-03-05 | Janssen Biotech, Inc. | Biomarcadores para el tratamiento anti-TNF en colitis ulcerosa y trastornos relacionados |
WO2011011339A1 (en) * | 2009-07-20 | 2011-01-27 | Genentech, Inc. | Gene expression markers for crohn's disease |
WO2011096573A1 (ja) * | 2010-02-08 | 2011-08-11 | 国立大学法人浜松医科大学 | 潰瘍性大腸炎の検出方法 |
US20110301051A1 (en) * | 2010-04-09 | 2011-12-08 | Exagen Diagnostics, Inc. | Biomarkers for Ulcerative Colitis and Crohn's Disease |
EP2713165A1 (en) * | 2012-09-28 | 2014-04-02 | INSERM (Institut National de la Santé et de la Recherche Médicale) | Use of vanin-1 as a biomarker of inflammatory bowel diseases |
US20160230230A1 (en) * | 2013-09-26 | 2016-08-11 | INSERM (Institut National de la Santé et de la Recherche Médicale) | Methods and kits for diagnosing ulcerative colitis in a subject |
EP3077538A1 (en) * | 2013-12-03 | 2016-10-12 | Nestec S.A. | Signaling pathways in tissues from inflammatory bowel disease patients |
WO2017087735A1 (en) * | 2015-11-18 | 2017-05-26 | Millennium Pharmaceuticals, Inc. | Method for treating crohn's disease |
US20230075784A1 (en) * | 2020-01-15 | 2023-03-09 | Board Of Regents Of The University Of Nebraska | Anti-maa lmmunoglobulin isotypes in inflammatory bowel disease: novel diagnostic implications for ulcerative colitis |
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