JP7423083B2 - 大腸癌の発癌リスクを検出する方法及びキット - Google Patents
大腸癌の発癌リスクを検出する方法及びキット Download PDFInfo
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Description
[1]大腸癌の発癌リスクを検出する方法であって、被験者由来の大腸上皮組織試料における、インターロイキン(IL)-17シグナル伝達に関わる遺伝子の機能欠失変異を検出する工程を含み、前記機能欠失変異が存在することが、前記被験者は大腸癌の発癌リスクが高いことを示す、方法。
[2]IL-17シグナル伝達に関わる前記遺伝子が、PIGR遺伝子、NFKB Inhibitor Zeta(NFKBIZ)遺伝子、TRAF3 Interacting Protein 2(TRAF3IP2)遺伝子、Interleukin 17 Receptor A(IL17RA)遺伝子、Zinc Finger CCCH-Type Containing 12A(ZC3H12A)又はNitric Oxide Synthase 2(NOS2)遺伝子である、[1]に記載の方法。
[3]IL-17シグナル伝達に関わる遺伝子の機能欠失変異を検出する前記工程が、被験者由来の大腸上皮組織試料における、PIGRタンパク質、分泌型IgAタンパク質、NFKBIZタンパク質、TRAF3IP2タンパク質、IL17RAタンパク質、ZC3H12Aタンパク質又はNOS2タンパク質の免疫染色により行われ、前記免疫染色の結果、前記大腸上皮組織試料中に、PIGRタンパク質、分泌型IgAタンパク質、NFKBIZタンパク質、TRAF3IP2タンパク質、IL17RAタンパク質、ZC3H12Aタンパク質又はNOS2タンパク質の発現が認められない細胞の存在が検出されることが、前記機能欠失変異が存在することを示す、[1]又は[2]に記載の方法。
[4]PIGR遺伝子、NFKBIZ遺伝子、TRAF3IP2遺伝子、IL17RA遺伝子、ZC3H12A遺伝子及びNOS2遺伝子からなる群より選択される1種又は2種以上の遺伝子の機能的欠失変異を検出するためのプローブ、PIGR遺伝子、NFKBIZ遺伝子、TRAF3IP2遺伝子、IL17RA遺伝子、ZC3H12A遺伝子及びNOS2遺伝子からなる群より選択される1種又は2種以上の遺伝子を増幅するためのプライマー、又は、PIGRタンパク質、分泌型IgAタンパク質、NFKBIZタンパク質、TRAF3IP2タンパク質、IL17RAタンパク質、ZC3H12Aタンパク質及びNOS2タンパク質からなる群より選択される1種又は2種以上のタンパク質に対する特異的結合物質、を含む、大腸癌の発癌リスクを検出するためのキット。
1実施形態において、本発明は、大腸癌の発癌リスクを検出する方法であって、被験者由来の大腸上皮組織試料における、IL-17シグナル伝達に関わる遺伝子の機能欠失変異を検出する工程を含み、前記機能欠失変異が存在することが、前記被験者は大腸癌の発癌リスクが高いことを示す方法を提供する。本実施形態の方法において、被験者は潰瘍性大腸炎患者であることが好ましい。また、大腸上皮組織試料は、炎症を起こした領域の試料であることが好ましい。
1実施形態において、本発明は、PIGR遺伝子、NFKBIZ遺伝子、TRAF3IP2遺伝子、IL17RA遺伝子、ZC3H12A遺伝子及びNOS2遺伝子からなる群より選択される1種又は2種以上の遺伝子の機能的欠失変異を検出するためのプローブ、PIGR遺伝子、NFKBIZ遺伝子、TRAF3IP2遺伝子、IL17RA遺伝子、ZC3H12A遺伝子及びNOS2遺伝子からなる群より選択される1種又は2種以上の遺伝子を増幅するためのプライマー、又は、PIGRタンパク質、分泌型IgAタンパク質、NFKBIZタンパク質、TRAF3IP2タンパク質、IL17RAタンパク質、ZC3H12Aタンパク質及びNOS2タンパク質からなる群より選択される1種又は2種以上のタンパク質に対する特異的結合物質、を含む、大腸癌の発癌リスクを検出するためのキットを提供する。
1実施形態において、本発明は、被験者由来の大腸上皮組織試料における、IL-17シグナル伝達に関わる遺伝子の機能欠失変異を検出する工程と、前記機能欠失変異が存在した場合に、前記被験者に潰瘍性大腸炎の治療薬及び/又は抗癌剤を投与する工程と、を含む、大腸癌の治療方法を提供する。
(オルガノイドの調製)
実験は慶應義塾大学医学部倫理委員会の承認に基づいて行った(承認番号20120057、20130512、G3553-(7))。インフォームドコンセントを受け、大腸内視鏡検査又は手術を受けた潰瘍性大腸炎患者から、腸組織試料を採取した。
(IL-17シグナル伝達に関わる遺伝子の機能欠失変異の検討1)
実験例1で樹立した各オルガノイドクローンの全エクソームシーケンシングにより、UCinfオルガノイドに特異的な遺伝子変異が蓄積しているか否かを検討した。機能欠失変異の原因となる可能性がある、ナンセンス変異、フレームシフト変異、スプライシング部位における変異を含むtruncating変異(短縮型変異)に着目した。
(IL-17シグナル伝達に関わる遺伝子の機能欠失変異の検討2)
実験例2ではオルガノイドクローンを用いてtruncating変異の蓄積を検討した。本実験例では、4パッセージ以下の培養しか行っていないポリクローナルなUCinfオルガノイド、UCuninfオルガノイド及びHCオルガノイドからゲノムDNAを抽出し、標的遺伝子をシーケンシングすることにより、truncating変異の蓄積を検討した。標的遺伝子としては、IL-17シグナル伝達に関わる遺伝子及び散発性大腸癌のドライバー遺伝子を含む37遺伝子を検討した。
(PIGRタンパク質の免疫染色1)
実験例2及び3において、UCinfオルガノイドにはPIGR遺伝子のtruncating変異が高い頻度で生じていることが明らかとなった。本実験例では、潰瘍性大腸炎患者由来の炎症を起こした領域の大腸上皮組織試料の薄切切片を免疫染色し、PIGRタンパク質の発現を検討した。
(IL-17シグナル伝達に関わる遺伝子の機能欠失変異の検討3)
実験例1で樹立した大腸炎関連腫瘍に由来するオルガノイド(以下、「CANオルガノイド」という場合がある。)クローンの全エクソームシーケンシングにより、実験例2で検討したNFKBIZ遺伝子、PIGR遺伝子、TRAF3IP2遺伝子、TP53遺伝子及びARID1A遺伝子に特異的な遺伝子変異が蓄積しているか否かを検討した。
Claims (3)
- 炎症性腸疾患患者の炎症領域が大腸癌を発癌するリスクを検出する方法であって、
前記患者由来の大腸の炎症領域の上皮組織試料における、インターロイキン(IL)-17シグナル伝達に関わる遺伝子の機能欠失変異を検出する工程を含み、
前記機能欠失変異が存在することが、前記患者は大腸癌の発癌リスクが高いことを示し、
IL-17シグナル伝達に関わる前記遺伝子が、PIGR遺伝子、NFKB Inhibitor Zeta(NFKBIZ)遺伝子、TRAF3 Interacting Protein 2(TRAF3IP2)遺伝子、Interleukin 17 Receptor A(IL17RA)遺伝子、Zinc Finger CCCH-Type Containing 12A(ZC3H12A)遺伝子、Nitric Oxide Synthase 2(NOS2)遺伝子から選択される少なくとも一つである、方法。 - IL-17シグナル伝達に関わる遺伝子の機能欠失変異を検出する前記工程が、前記患者由来の大腸の炎症領域の上皮組織試料における、PIGRタンパク質若しくはPIGRタンパク質の機能を反映する上皮細胞の細胞質における分泌型IgAタンパク質、NFKBIZタンパク質、TRAF3IP2タンパク質、IL17RAタンパク質、ZC3H12Aタンパク質又はNOS2タンパク質の免疫染色により行われ、
前記免疫染色の結果、前記上皮組織試料中に、PIGRタンパク質若しくはPIGRタンパク質の機能を反映する上皮細胞の細胞質における分泌型IgAタンパク質、NFKBIZタンパク質、TRAF3IP2タンパク質、IL17RAタンパク質、ZC3H12Aタンパク質又はNOS2タンパク質の発現が認められない細胞の存在が検出されることが、前記機能欠失変異が存在することを示す、請求項1に記載の方法。 - PIGR遺伝子、NFKBIZ遺伝子、TRAF3IP2遺伝子、IL17RA遺伝子、ZC3H12A遺伝子及びNOS2遺伝子からなる群より選択される1種又は2種以上の遺伝子の機能的欠失変異を検出するためのプローブ、
PIGR遺伝子、NFKBIZ遺伝子、TRAF3IP2遺伝子、IL17RA遺伝子、ZC3H12A遺伝子及びNOS2遺伝子からなる群より選択される1種又は2種以上の遺伝子を増幅するためのプライマー、又は、
PIGRタンパク質又はPIGRタンパク質の機能を反映する上皮細胞の細胞質における分泌型IgAタンパク質、NFKBIZタンパク質、TRAF3IP2タンパク質、IL17RAタンパク質、ZC3H12Aタンパク質及びNOS2タンパク質からなる群より選択される1種又は2種以上のタンパク質に対する特異的結合物質、
を含む、炎症性腸疾患患者の炎症領域が大腸癌を発癌するリスクを検出するためのキット。
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