JP7145980B2 - 腫瘍浸潤リンパ球にて発現するt細胞受容体により認識される抗原を識別するためのシステム - Google Patents
腫瘍浸潤リンパ球にて発現するt細胞受容体により認識される抗原を識別するためのシステム Download PDFInfo
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Description
以下の定義は、本開示を理解するのに役立つ。
いくつかの実施形態では、配列決定工程には、配列位置合わせの工程を含む、配列分析を伴う。いくつかの実施形態では、アラインメントを使用して、複数の配列、例えば同じバーコード(UID)を有する複数の配列からコンセンサス配列を決定する。いくつかの実施形態では、バーコード(UID)は、全てが同一のバーコード(UID)を有する複数の配列からコンセンサスを決定するために使用される。他の実施形態では、バーコード(UID)は、を使用して、人工物、すなわち、同一のバーコード(UID)を有する一部の配列に存在するが全ての配列には存在しない変動を除去するために使用される。PCRエラー又は配列決定エラーから生じるこのような人工物は、除去され得る。
(細胞バーコード1+TCRA配列x1)+(細胞バーコード1+TCRB配列y1)+(細胞バーコード1+pMHCバーコードz1)
(細胞バーコード2+TCRA配列x2)+(細胞バーコード2+TCRB配列y2)+(細胞バーコード2+pMHCバーコードz2)
(細胞バーコードn+TCRA配列xn)+(細胞バーコードn+TCRB配列yn)+(細胞バーコードn+pMHCバーコードzn)
本実施例では、外科的に切除した腫瘍の断片を入手する。機械的及び酵素的組織解離法を組み合わせて使用して、腫瘍試料を単一細胞に解離させる。各細胞の種類に特異的な、表面、細胞内、又は核マーカーを使用して、蛍光活性化細胞選別(FACS)により、解離した細胞を腫瘍細胞、通常の組織細胞、及び免疫細胞(腫瘍浸潤リンパ球(TIL))にソートする。腫瘍細胞バイオマーカーはサイトケラチンであるが、T細胞バイオマーカーの組み合わせは、CD3+CD8+TCR+である。核酸は、腫瘍細胞、通常の細胞、及びT細胞の個別の分画から単離され、任意に、KAPA Express Extract kit and KAPA HiFi QC reagents(Kapa Biosystems,Wilmington,Mass.)を使用して定量化される。
Claims (17)
- α鎖(TCRα)及びβ鎖(TCRβ)で構成されるT細胞受容体(TCR)に対する同種抗原を識別する方法であって、
a.各T細胞がTCRα及びTCRβ鎖を含むTCRを含む、患者から入手されたT細胞の集団において、前記各T細胞の核酸を細胞特異的バーコードでバーコード化することと、
b.前記バーコード化した核酸を配列決定して、前記TCRα及びTCRβ鎖をコードするTCRA及びTCRB遺伝子配列を入手することと、
c.機能性TCRをコードする遺伝子対と同じバーコードを有するTCRA及びTCRB遺伝子を識別することと、
d.工程cにて識別された前記TCRA及びTCRB遺伝子対を、それぞれのT細胞に導入することと、
e.1つ以上の腫瘍ネオ抗原を含み得る、前記患者から入手された腫瘍細胞の集団において、前記腫瘍ネオ抗原遺伝子を識別することと、
f.工程e.で識別したネオ抗原遺伝子からネオ抗原ペプチドを形成することと、
g.工程fの前記ネオ抗原ペプチドを、MHC-1抗原提示複合体及びオリゴヌクレオチドバーコードと組み合わせて、バーコード化MHCネオ抗原ペプチド複合体を形成することと、
h.工程dの前記T細胞を、工程gの前記バーコード化MHCネオ抗原ペプチド複合体と接触させて、細胞が結合したMHCネオ抗原TCR複合体を形成することと、
i.前記TCR遺伝子、及び、工程hの各T細胞からの前記MHCネオ抗原複合体バーコードを、細胞特異的なバーコードによりバーコード化することと、ここで前記バーコード化が、
I.前記複数のT細胞を、遺伝子特異的配列及びバーコードオリゴヌクレオチドアニーリング領域を含むプライマーの混合物と接触させることと、
II.前記複数のT細胞を、前記プライマー内のバーコードオリゴヌクレオチドアニーリング領域に相補性のバーコードオリゴヌクレオチドと接触させることと、
III.スプリットプール合成の1つ以上のラウンドのそれぞれにおいて、前記複数のT細胞を、各ラウンドの前記バーコード化オリゴヌクレオチドが以前のラウンドの前記バーコードオリゴヌクレオチドの前記アニーリング領域に相補性のアニーリング領域を含む追加のバーコードオリゴヌクレオチドと接触させ、前記複数のT細胞のそれぞれにおける各プライマー上に細胞特異的バーコードを組み立てること、
を含むものである、
j.工程iからの前記T細胞において、細胞特異的バーコードと関連する前記TCR遺伝子、及び細胞特異的バーコードと関連する前記MHCネオ抗原複合体バーコードを配列決定することと、
k.前記TCR遺伝子及びMHCネオ抗原複合体バーコードのうち少なくとも1つが、同じ細胞特異的バーコードと関連している場合に、前記ネオ抗原を前記TCRに対する前記同種抗原と識別すること、
を含む方法。 - 前記T細胞の集団は、前記患者において腫瘍組織を解離することにより入手されたものである、請求項1に記載の方法。
- TCRα及びTCRβ鎖をコードするTCRA及びTCRB遺伝子配列は、再配列されたDNA配列又はRNA配列から選択される、請求項1又は2に記載の方法。
- 前記T細胞の集団は、タンパク質マーカー発現ベースの捕捉により前記腫瘍組織から入手されたものである、請求項2に記載の方法。
- 工程aにおける前記T細胞バーコード化は、
a.前記複数のT細胞を、遺伝子特異的配列及びバーコードオリゴヌクレオチドアニーリング領域を含むプライマーの混合物と接触させることと、
b.前記複数のT細胞を、前記プライマー内のバーコードオリゴヌクレオチドアニーリング領域に相補性のバーコードオリゴヌクレオチドと接触させることと、
c.スプリットプール合成の1つ以上のラウンドのそれぞれにおいて、前記複数のT細胞を、各ラウンドの前記バーコード化オリゴヌクレオチドが以前のラウンドの前記バーコードオリゴヌクレオチドの前記アニーリング領域に相補性のアニーリング領域を含む追加のバーコードオリゴヌクレオチドと接触させ、前記複数のT細胞のそれぞれにおける各プライマー上に細胞特異的バーコードを組み立てること、
を含む方法により実施される、請求項1~4のいずれか1項に記載の方法。 - 工程aにおける前記核酸のバーコード化は、
a.前記核酸を含有するT細胞の集団を、1つの細胞を含有する複数の第1の分画に分画することと、
b.前記細胞を含有する分画を、それぞれが、遺伝子特異的配列及びバーコードを含む、バーコード化オリゴヌクレオチドプライマーの複数のコピーを含有する複数の第2の分画と混合することであって、前記バーコードは、各分画内で同じであるが、分画間では異なっている、混合することと、
c.前記第1及び第2の分画を融合することと、
d.バーコード化オリゴヌクレオチドプライマーでアンプリコンを形成し、前記核酸をバーコード化すること、
を含む方法により実施される、請求項1~4のいずれか1項に記載の方法。 - 工程aにおける前記バーコード化、及び工程bにおける配列決定は、
a.前記T細胞の集団を、細胞の群を含有する複数の分画に分画することと、
b.バーコード化アダプターを、各分画内の核酸にライゲーションすることと、
c.前記アダプター化した核酸内の前記TCRA及びTCRBを配列決定して、バーコード化TCRA及びTCRB配列を入手することと、
d.TCRA及びTCRB遺伝子対塩基の、分画内で同時発生する頻度を測定すること、
を含む方法により実施される、請求項1~4のいずれか1項に記載の方法。 - 前記バーコード化TCR遺伝子の配列決定は、前記遺伝子の前記CDR3超可変領域を配列決定することである、請求項1~7のいずれか1項に記載の方法。
- 前記TCR遺伝子の識別は、前記遺伝子の前記CDR3超可変領域を識別することである、請求項1~8のいずれか1項に記載の方法。
- 前記ネオ抗原遺伝子は、前記腫瘍細胞内の前記核酸を配列決定し、非サイレント変異を有する遺伝子をネオ抗原遺伝子として識別することにより識別される、請求項1~9のいずれか1項に記載の方法。
- 前記ネオ抗原遺伝子は、ペプチドアレイを患者の血清でスクリーニングすることにより識別される、請求項1~9のいずれか1項に記載の方法。
- 工程dにおける前記遺伝子は発現ベクターに導入される、請求項1~11のいずれか1項に記載の方法。
- 前記受容性T細胞は内因性TCR遺伝子を欠いている、請求項1~12のいずれか1項に記載の方法。
- 工程dにおける前記遺伝子は転写活性DNA断片として導入される、請求項1~13のいずれか1項に記載の方法。
- 工程dにおける前記遺伝子はmRNAとして導入される、請求項1~13のいずれか1項に記載の方法。
- 前記識別されたネオ抗原が前記MHC-I分子に結合する能力により更に選択される、請求項1~15のいずれか1項に記載の方法。
- 前記ネオ抗原TCR複合体内で前記ネオ抗原及び前記TCRをバーコード化することは、各複合体を、バーコードを含有する反応体積に区画化することを含む、請求項1~16のいずれか1項に記載の方法。
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