JP2021534794A - 変異型garsタンパク質の発現を阻害するための生成物および方法 - Google Patents
変異型garsタンパク質の発現を阻害するための生成物および方法 Download PDFInfo
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Abstract
Description
本出願は、開示の別個の部分として、コンピュータ可読形式の配列表(ファイル名:2019年8月29日に作成された53284A_SeqListing.txt、64,937バイト、ASCIIテキストファイル)を含み、その全体が参照により本明細書に組み込まれる。
したがって、CMT2Dの処置に対する当該技術分野における必要性が残っている。
CMT2D患者の臨床評価および変異分析
患者特異的GARS変異を選択して、本明細書において提供される方法および生成物を例示した。GARS変異は、筋緊張の低下、頭の遅れ、腋窩の滑り、軽度の舌萎縮、手足の靭帯弛緩、および13ヶ月齢から始まる胸壁の過剰な退縮を示すことによって臨床的に現れた現在6歳の女性において同定された。15ヶ月での筋生検は、ニューロパチーと一致する神経原性変化を示した。これには、I型およびII型線維の顕著な萎縮が含まれ、筋線維壊死、変性、または再生の証拠はなく、ジストロフィー性または炎症性ミオパシーの証拠も含まれなかった。EMGおよび神経伝導研究はまた、運動ニューロン疾患と一致した。脊髄性筋萎縮症の陰性検査の後、全エクソンシーケンシング分析により、患者が、グリシル−tRNAシンテターゼ(GARS)遺伝子(c.894_905del、NM_002047.2)のエクソン8における12ヌクレオチド欠失についてインフレームでヘテロ接合性であることが明らかになった。
GARS発現研究
ΔETAQ GARS変異がmRNA発現または安定性に影響を及ぼすかどうかを決定するために、RNA−seqを実施して、患者の初代皮膚線維芽細胞における野生型および変異型対立遺伝子の発現を評価した。
マウスモデル
GARSに優性変異を有し、末梢ニューロパチーを引き起こすCMT2Dの3つのマウスモデルが本明細書に提供されている。これらのうちの2つは、マウス特異的対立遺伝子を担持し、Seburnら、Neuron、51:715−726(2006年)およびAchilliら、Disease Models&Mechanisms、2:359−373(2009年)に以前に記載されており、3番目は、例1に記載されるヒト疾患関連変異を有し、その作成は以下に記載されている。同時に、モデルは、様々な重症度を提供し、ヒト対立遺伝子を含む複数の対立遺伝子を前臨床試験で使用できるようにする。すべてのモデルは、長さに依存する末梢ニューロパチーを伴う優れた表面的妥当性を有し、表現型の根底にあるマウスGars遺伝子の優性変異を伴う構成概念妥当性を有する。
ssODNドナー:AGTTTACTTGTAACAGGCTTTGTTTTATTGGAAGCACATTGTCTTACTTGTAATAGACTGGTTTATTTAATTTTATAGATACTTGAGACCGGGGATTTTCtTGAATTTCAAACGACTTTTGGAATTCAAC(配列番号60)
sgRNA 144:aaaattccctgtgcagtttc(配列番号61)
sgRNA 1340:tcagaaatgagatctcacct(配列番号62)
GARS遺伝子に特異的なマイクロRNA
RNAiを使用して変異型GARSの対立遺伝子特異的ノックダウンを達成するために、本発明者らはまず、GARSΔETAQ/huEx8マウスでの分解のためにΔETAQ転写産物を特異的に標的とするように設計されたmiRNAシャトルを操作した(図4A〜図4B、図5)。具体的には、本発明者らは、分解のためにヒトおよびマウス変異型GARSΔETAQ mRNAの両方を特異的に標的とするように設計された成熟ガイド鎖を有する6つの異なるmir−30ベースの人工マイクロRNAシャトル(mi.ΔETAQ1−6)を設計した(図4B、図5)。
scAAV9.mi.ΔETAQの産生
インビトロ試験が完了した後、mi.ΔETAQ(図4B)を、インビボでの送達のためにscAAV9にクローン化した。「scAAV9.mi.ΔETAQ」と命名されたscAAV9はまた、CMVプロモーター駆動eGFPレポーター遺伝子を含んでいた。scAAV9.mi.ΔETAQは、変異型AAV2逆方向末端反復(ITR)および自己相補的AAVゲノムのパッケージングを可能にする野生型AAV2 ITRを含む。
scAAV9.mi.P278KYおよびscAAV9.mi.ΔETAQの新生仔送達
インビトロでのこのアプローチの原理証明を最初に確立するために、本発明者らは、疾患発症前の変異型GARS発現の減少が、GARSΔETAQ/huEx8マウスにおけるニューロパチーの発症を防ぐことができるかどうかを試験した。総用量約2.6×1011vgのscAAV9.mi.ΔETAQまたはscAAV9.mi.lacZ(E.coli LacZ遺伝子を標的とする対照マイクロRNAを発現する)を、生後0〜1日目(P0〜1)に脳室内(ICV)注射で、GARSΔETAQ/huEx8および同腹仔対照(GARShuEx8/huEx8)仔に送達した。
発症後のマウスへの遺伝子療法構築物の髄腔内送達
この戦略の翻訳的性質を実証するために、scAAV9.mi.ΔETAQを、初期(5週齢)および後期(9週齢)の症候性GARSΔETAQ/huEx8マウスおよび同腹仔対照の両方のコホートに、腰髄への単回髄腔内(IT)注射によって送達した。32ゲージ針を備えたハミルトンシリンジ(カタログ番号7655−01)を使用して、全成人発症後マウスに、滅菌リン酸緩衝生理食塩水(約10μl)に希釈したscAAV9.mi.P278KYまたはscAAV9.mi.ΔETAQの約1×1011DRPS/マウスを腰椎穿刺による髄腔内注射で注射した。ここでは、すべてのマウスをイソフルランで麻酔し、32ゲージ針を備えたハミルトンシリンジを使用して、L6棘突起に適切なベクターを注射した。各ベクターをゆっくりと注射し、針を抜去する前に5〜10秒間そのままにした。
rAAV9−miGARS/rGARSベクターおよび使用
RNAiにより変異型および野生型Gars発現をノックダウンし、また、RNAi耐性cDNA(rGARS)により野生型Gars発現を回復させるrAAV9(rAAV9−miGARS/rGARSベクター)を作成する。ベクターには2つの重要な構成要素である(1)GARS標的化マイクロRNAをコードするカセット、(2)RNAi耐性置換ヒトGARS cDNAカセット(2.2kb)がある。AAV逆方向末端反復配列(ITR)を含むペイロードの合計サイズは約4.0kbであり、それによりssAAVベクターの使用が必要となる。2つのカセットは、ヘッドトゥーテールの方向(プロモーターが5’末端であり、そしてターミネーターまたはポリAが3’である)で並んでクローニングされる。
GARS交換活動レベルの目標
正常な機能に必要な野生型Gars遺伝子発現の下限を定義するために実験を行った。
ΔETAQ GARSは、酵素の主要な機能に影響を与える。
ΔETAQ GARSが酵素の主要な機能に影響を与えるかどうかを評価するために、実験を行った。アミノアシル化アッセイおよび酵母相補性試験の両方を行った。
ΔETAQ GARSは、NRP1とのわずかに異常な相互作用を示した。
ニューロパチー関連GARS変異は、ニューロピリン−1(NRP1)への不適切な結合を引き起こし、運動ニューロンにおけるNRP1/VEGFシグナル伝達の障害をもたらす(23)。ΔETAQ GARSとNRP1との間の結合を直接試験するために、V5タグ付き野生型、P234KY、およびΔETAQ GARSをマウス運動ニューロン細胞株NSC−34で発現させた。
Claims (38)
- 核酸であって、
(a)配列番号1〜25のいずれか1つに示されるポリヌクレオチド配列に少なくとも約70%、75%、80%、81%、82%、83%、84%、85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、99%、または100%の同一性を含むグリシル−tRNAシンテターゼ(GARS)miRNAをコードする核酸、
(b)配列番号26〜50のいずれか1つに示されるポリヌクレオチド配列に少なくとも約70%、75%、80%、81%、82%、83%、84%、85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、99%、または100%の同一性を含むGARSガイド鎖をコードする核酸、あるいは
(c)配列番号1〜25のいずれか1つに示されるポリヌクレオチド配列に少なくとも約70%、75%、80%、81%、82%、83%、84%、85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、99%、または100%の同一性を含むGARS miRNAをコードする核酸、および配列番号51〜57のいずれか1つに示されるポリヌクレオチド配列に少なくとも約70%、75%、80%、81%、82%、83%、84%、85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、99%、または100%の同一性を含むRNAi耐性GARS遺伝子を含む核酸を含む、核酸。 - 請求項1に記載の核酸またはそれらのいずれか1つまたは複数の組み合わせを含むウイルスベクター。
- 前記ウイルスベクターが、アデノ随伴ウイルス(AAV)、アデノウイルス、レンチウイルス、レトロウイルス、ポックスウイルス、バキュロウイルス、単純ヘルペスウイルス、ワクシニアウイルス、または合成ウイルスである、請求項2に記載のウイルスベクター。
- 前記ウイルスベクターが、AAVである、請求項3に記載のウイルスベクター。
- 前記AAVが、repおよびcap遺伝子を欠いている、請求項4に記載のウイルスベクター。
- 前記AAVが、組換えAAV(rAAV)または自己相補的組換えAAV(scAAV)である、請求項4または5に記載のウイルスベクター。
- 前記AAVが、AAV−1、AAV−2、AAV−3、AAV−4、AAV−5、AAV−6、AAV−7、AAV−8、AAV−9、AAV−10、AAV−11、AAV−12、AAV−13、AAV−anc80、およびAAV rh.74からなる群から選択されるカプシド血清型を有する、請求項4から6のいずれか一項に記載のウイルスベクター。
- 前記AAVが、AAV−9のカプシド血清型を有する、請求項4から7のいずれか一項に記載のウイルスベクター。
- 前記AAVが、偽型AAVである、請求項4から8のいずれか一項に記載のウイルスベクター。
- 前記AAVが、AAV2/8またはAAV2/9である、請求項9に記載のウイルスベクター。
- 前記GARS miRNAをコードする核酸の発現が、U6プロモーターの制御下にある、請求項4から10のいずれか一項に記載のウイルスベクター。
- 前記RNAi耐性置換GARS遺伝子の発現が、ニワトリβ−アクチンプロモーターの制御下にある、請求項4から10のいずれか一項に記載のウイルスベクター。
- 請求項1に記載の核酸と、薬学的に許容される担体とを含む組成物。
- 請求項2から12のいずれか一項に記載のウイルスベクターと、薬学的に許容される担体とを含む組成物。
- 神経細胞に薬剤を送達することができる送達媒体と、
(a)RNAi耐性ヒトGARS遺伝子を含む核酸、
(b)miRNAをコードする核酸であって、前記miRNAは、ヒトグリシル−tRNAシンテターゼ(GARS)遺伝子によってコードされるメッセンジャーRNA(mRNA)のセグメントに結合し、前記セグメントは、野生型マウスGARS遺伝子に対して保存され、前記セグメントは、CMT2Dに関連する変異を含む配列をコードしない、核酸、または
(c)(a)と(b)の組み合わせと、場合により、
(d)薬学的に許容される担体とを含む、組成物。 - 前記RNAi耐性ヒトGARS遺伝子を含む核酸が、配列番号51〜57のいずれか1つの配列と少なくとも約70%、75%、80%、81%、82%、83%、84%、85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、99%、または100%の同一性を含むポリヌクレオチドを含む、請求項16に記載の組成物。
- 前記ヒトGARS遺伝子が、配列番号69の配列、あるいは配列番号69の配列と少なくとも約70%、75%、80%、81%、82%、83%、84%、85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、または99%の同一性を含むその変異体を含む、請求項15または16に記載の組成物。
- 前記マウスGARS遺伝子が、配列番号70の配列、あるいは配列番号70の配列と少なくとも約70%、75%、80%、81%、82%、83%、84%、85%、86%、87%、88%、89%、90%、91%、92%、93%、94%、95%、96%、97%、98%、または99%の同一性を含むその変異体を含む、請求項15から17のいずれか一項に記載の組成物。
- 前記mRNAセグメントが、配列番号69の配列を含むヒトGARS遺伝子のヌクレオチド136〜323、327〜339、544〜590、720〜785、996〜1406、1734〜1913または1950〜2187内の配列に相補的である、請求項15から18のいずれか一項に記載の組成物。
- 前記mRNAセグメントが、配列番号69のヌクレオチド996〜1406内の配列に相補的である、請求項19に記載の組成物。
- 前記送達媒体が、ウイルスベクターである、請求項16から21のいずれか一項に記載の組成物。
- 前記ウイルスベクターが、アデノ随伴ウイルス(AAV)、アデノウイルス、レンチウイルス、レトロウイルス、ポックスウイルス、バキュロウイルス、単純ヘルペスウイルス、ワクシニアウイルス、または合成ウイルスである、請求項21に記載の組成物。
- 前記ウイルスベクターが、AAVである、請求項22に記載の組成物。
- 前記AAVが、repおよびcap遺伝子を欠いている、請求項23に記載の組成物。
- 前記AAVが、組換えAAV(rAAV)または自己相補的組換えAAV(scAAV)である、請求項23または24に記載の組成物。
- 前記AAVが、AAV−1、AAV−2、AAV−3、AAV−4、AAV−5、AAV−6、AAV−7、AAV−8、AAV−9、AAV−10、AAV−11、AAV−12、AAV−13、AAV−anc80、およびAAV rh.74からなる群から選択されるカプシド血清型を有する、請求項23から25のいずれか一項に記載の組成物。
- 前記AAVが、AAV−9のカプシド血清型を有する、請求項23から26のいずれか一項に記載の組成物。
- 前記AAVが、偽型AAVである、請求項23から27のいずれか一項に記載の組成物。
- 前記AAVが、AAV2/8またはAAV2/9である、請求項28に記載の組成物。
- 前記GARS miRNAをコードする核酸の発現が、U6プロモーターの制御下にある、請求項21から29のいずれか一項に記載の組成物。
- 前記RNAi耐性置換GARS遺伝子の発現が、ニワトリβアクチンプロモーターの制御下にある、請求項21から29のいずれか一項に記載の組成物。
- 変異型グリシル−tRNAシンテターゼ(GARS)遺伝子を含む神経細胞に送達する方法であって、前記方法が、前記神経細胞に、
(a)請求項1に記載の核酸、
(b)請求項2から12のいずれか一項に記載のベクター、または
(c)請求項13から31のいずれか一項に記載の組成物を投与することを含む、方法。 - 変異型グリシル−tRNAシンテターゼ(GARS)遺伝子に罹患している対象を処置する方法であって、前記方法が、前記対象に、
(a)請求項1に記載の核酸、
(b)請求項2から12のいずれか一項に記載のベクター、または
(c)請求項13から31のいずれか一項に記載の組成物を投与することを含む、方法。 - 前記対象が、シャルコー・マリー・トゥース病2D型(CMT2D)または遠位遺伝性運動ニューロパチーに罹患している、請求項33に記載の方法。
- 前記神経細胞が、ヒト神経細胞である、請求項32に記載の方法。
- 前記対象が、ヒト対象である、請求項33または34に記載の方法。
- 変異型グリシル−tRNAシンテターゼ(GARS)遺伝子に罹患している対象の処置における、請求項1に記載の少なくとも1つの核酸、請求項2から12のいずれか一項に記載のウイルスベクター、または請求項13から31のいずれか一項に記載の組成物の使用。
- 処置を必要としている対象におけるシャルコー・マリー・トゥース病2D型(CMT2D)または遠位遺伝性運動ニューロパチーの処置における、請求項1に記載の少なくとも1つの核酸、請求項2から12のいずれか一項に記載のウイルスベクター、または請求項13から31のいずれか一項に記載の組成物の使用。
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