Bifunctional Crosslinking oligonucleotides adapted for linking to a target sequence of duplex DNA
申请人:Epoch Pharmaceuticals, Inc.
公开号:US06312953B1
公开(公告)日:2001-11-06
Chemically modified oligonucleotides (ODNS) are complementary, either in the sense of the classic “four letter code” recognition motif, or in the sense required for triple strand formation based on the more limited “two letter code recognition motif”, to a target sequence of double stranded DNA of an invading cell, organism or pathogen, such as a virus, fungus, parasite, bacterium, malignant cell, or any duplex DNA which is desired to be broken into segments for the purpose of “mapping”. The ODNs have cross-linking agents covalently attached at least to two different sites of the ODN. Alternatively, the cross-linking agent which is attached to one site on the ODN has two cross-linking functionalities, and therefore in effect comprises two cross-linking agents. The cross-linking agent typically includes a linker arm (such as an alkyl, alkoxy, aminoalkyl or amidoalkyl chain) and a reactive group which, after triple strand formation with the target sequence of DNA, is capable of reacting with the target DNA to form a covalent bond therewith. Each cross-linking agent of the novel modified ODNs is capable of forming a covalent bond with the target DNA. As a result of the covalent bond formation between the modified ODN and both strands of the target DNA sequence, replication and expression of the target DNA sequence is inhibited. Alternatively the duplex DNA is selectively cleaved with enzymes or amino acids, at the alkylation sites for “mapping” or other investigative purposes.
化学修饰的寡核苷酸(ODNS)与侵入细胞、生物或病原体(如病毒、真菌、寄生虫、细菌、恶性细胞或任何需要分段“映射”的双链DNA)的靶序列互补,可以是经典的“四字母代码”识别基序的意义,也可以是基于更有限的“两字母代码识别基序”的三链体形成所需的意义。ODNS上至少连接有两个不同位点的交联剂。或者,连接在ODNS上的交联剂具有两个交联功能,因此实际上包含两个交联剂。交联剂通常包括一个连接臂(例如烷基、烷氧基、氨基烷基或酰胺基烷基链)和一个反应基团,在与DNA的靶序列形成三链体后,能够与靶DNA反应形成共价键。新型修饰的ODNS的每个交联剂都能够与靶DNA形成共价键。由于修饰的ODNS与靶DNA序列的两条链之间形成共价键,因此抑制了靶DNA序列的复制和表达。或者,双链DNA可在烷基化位点上通过酶或氨基酸选择性切割,用于“映射”或其他调查目的。