JP4931247B2 - 新規時間遺伝子およびその応用 - Google Patents
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Description
(a) 配列番号1〜4のいずれかの塩基配列からなるDNA
(b) 前記(a)の塩基配列において1個もしくは数個の塩基が欠失、置換または付加された塩基配列からなり、かつ、BMAL2タンパク質と相互作用するタンパク質をコードするDNA
(c) 前記(a)の塩基配列において1個もしくは数個の塩基が欠失、置換または付加された塩基配列からなり、前記(a)のDNAとストリンジェントな条件でハイブリダイズするDNA
(d) 前記(a)の塩基配列において1個もしくは数個の塩基が欠失、置換または付加された塩基配列からなり、前記(a)のDNAとの相同性が90%以上であるDNA
(e) 前記(a)〜(d)のいずれかのDNAと相補的な塩基配列からなるDNA
(a) 配列番号1〜4のいずれかの塩基配列からなるDNA
(b) 前記(a)の塩基配列において1個もしくは数個の塩基が欠失、置換または付加された塩基配列からなり、かつ、BMAL2タンパク質と相互作用するタンパク質をコードするDNA
(c) 前記(a)の塩基配列において1個もしくは数個の塩基が欠失、置換または付加された塩基配列からなり、前記(a)のDNAとストリンジェントな条件でハイブリダイズするDNA
(d) 前記(a)の塩基配列において1個もしくは数個の塩基が欠失、置換または付加された塩基配列からなり、前記(a)のDNAとの相同性が90%以上であるDNA
(e) 前記(a)〜(d)のいずれかのDNAと相補的な塩基配列からなるDNA
マウスERIH1タンパク質: GenBankアセッション番号AY957601
ヒトERIH1タンパク質: GenBankアセッション番号AY946007
マウスERIH2タンパク質: GenBankアセッション番号AY957602
ヒトERIH2タンパク質: GenBankアセッション番号AY946008
2ハイブリッドシステムの使用方法に従って、以下の実験を行った。まず、Invitrogen社から購入したhBmal2のクローン(invitrogen Clone ID 3445178)から、PCRクローニングによりhBmal2クローンを取得した。そして、このhBmal2クローンを用いて、DNA結合ドメイン(BD)とhBMAL2タンパク質との融合タンパク質を発現するBD融合ベクターを調製した。前記ベクターにおけるベイド挿入断片は、3種類とし、hBMAL2タンパク質(配列番号7)のアミノ酸第1-56番目(ベイト1)、第193-283番目(ベイト2)、第125-422(ベイト3)の配列をそれぞれコードする配列とした。なお、各ベイド挿入断片の塩基配列がinvitrogen Clone ID 3445178の配列と一致していること、ならびに、各ベイドが自己活性化能を有しておらず、スクリーニングに有効であることは、それぞれ確認済みである。他方、ヒト血管内皮細胞のcDNAとGAL4転写活性化ドメイン(AD)とが結合したベクターを、選定ライブラリーベクターとした(AD融合ベクター)。そして、前述の3種類のBD融合ベクターを導入した酵母の形質転換体と、前記AD融合ベクターを導入した酵母の形質転換体とを、フィルターメイティング法により接合し、陽性コロニーを選択した(2ハイブリッド一次スクリーニング)。その結果、ベイト3を用いたスクリーニングにより陽性クローンが得られた。
前記(1)において決定された配列は、hBMAL2タンパク質に特異的に相互作用するhERIHタンパク質のうち、hBMAL2タンパク質との反応部位の配列である。したがって、さらにhErih遺伝子の5'側と3'側の配列を決定し、全塩基配列ならびにこれに基づきhERIHタンパク質の全アミノ酸配列を決定した。塩基配列の決定は、まず、従来公知の5'RACE法および3'RACE法を利用した。さらに、前記(1)における部分塩基配列の情報から、hErih遺伝子との類似遺伝子をコンピュータ検索した結果、マウスhypothetical protein XP#358333/NP#766072 に一部類似していたため、それを元に、PCRとシークエンスとを用いてhErih遺伝子の全長配列決定を行った。この結果、前記配列番号5の配列を含む2種類の塩基配列(配列番号1および配列番号2)が決定された。相対的に短い配列番号1の遺伝子をhErih1(human Erih1)(endo1)、相対的に長い配列番号2の遺伝子をhErih2(human Erih2)(endo2)と名付けた。これらの遺伝子のエクソンイントロン構造を比較した結果、hErih2遺伝子のエクソン11とエクソン12とが、hErih1遺伝子には存在しなかった。
hErih1遺伝子
配列番号8 Forward primer : 5'- GGGAAGAACCTCAGGAAAAGG?3'
配列番号9 Reverse primer : 5'- CGATCCCACTGTCCAATGTTC?3'
hErih2遺伝子
配列番号10 Forward primer : 5'- CAGCCCTGTTGCATGTTCA?3'
配列番号11 Reverse primer : 5'- GCCCTGAGAACTGCCCTTTA?3'
Bmal2遺伝子
配列番号12 Forward primer : 5'- GTGAGCCTGGAGAAGCATCA?3'
配列番号13 Reverse primer : 5'- CCAGCACCAAGTACTGTTCCA?3'
Bmal2遺伝子発現:骨髄<胎盤<小脳<精巣<脳(全脳)<胎児脳
Erih1遺伝子発現:腎<脳(全脳)<肺<精巣<胎児肝<胎児脳
Erih2遺伝子発現:脊髄<肺<精巣<小脳<脳(全脳)<胎児脳
抗癌剤としてオキザリプラチン(L-OHP)またはディプラチンを使用し、これを溶媒に混合してL-OHP液およびディプラチン液を調製した。これを抗癌剤液とした。
細胞へのsiRNAトランスフェクションは、QIAGEN社のRNAi Starter kitを用いて、そのプロトコールに従って行った。
Claims (1)
- 二本鎖siRNAを含む、細胞の抗癌剤耐性を緩和する薬剤であって、
前記二本鎖siRNAは、19塩基対と2塩基の3’末端オーバーハングとからなる21塩基の二本鎖siRNAであって、下記(a)〜(e)のいずれかのDNAからなる新規遺伝子を標的とし、前記19塩基対の配列が配列表の配列番号26〜28のいずれかである二本鎖siRNAであり、
前記細胞が卵巣癌細胞である、耐性緩和薬剤。
(a) 配列番号1〜4のいずれかの塩基配列からなるDNA
(b) 前記(a)の塩基配列において1個もしくは数個の塩基が欠失、置換または付加された塩基配列からなり、かつ、BMAL2タンパク質と相互作用するタンパク質をコードするDNA
(c) 前記(a)の塩基配列において1個もしくは数個の塩基が欠失、置換または付加された塩基配列からなり、前記(a)のDNAとストリンジェントな条件でハイブリダイズするDNA
(d) 前記(a)の塩基配列において1個もしくは数個の塩基が欠失、置換または付加された塩基配列からなり、前記(a)のDNAとの相同性が90%以上であるDNA
(e) 前記(a)〜(d)のいずれかのDNAと相補的な塩基配列からなるDNA
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