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siRNA targeting minichromosome maintenance deficient 4 (MCM4)

a technology of mcm4 and mcm4, which is applied in the field of rna interference, can solve the problems of long dsrna not being a viable option for rnai in mammalian systems, inhibiting protein synthesis, and unable to induce rnai with limited success, so as to increase the efficiency of rnai and increase the effect of sirna

Inactive Publication Date: 2007-09-06
DHARMACON INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a kit, siRNA, and method for increasing the efficiency of RNAi in mammalian systems. The kit includes a pool of at least two siRNA duplexes, each containing a sequence that is complementary to a portion of the sequence of one or more target messenger RNA. The siRNA is selected using non-target specific criteria. The method involves applying selection criteria to a set of potential siRNA, and determining the relative functionality of the siRNA. The invention also provides a formula for selecting siRNA based on various criteria. The technical effect of the invention is to increase the efficiency of RNAi in mammalian systems.

Problems solved by technology

However, these attempts to induce RNAi met with limited success, due in part to the induction of the interferon response, which results in a general, as opposed to a target-specific, inhibition of protein synthesis.
Thus, long dsRNA is not a viable option for RNAi in mammalian systems.
One of the most contentious issues in RNAi is the question of the necessity of siRNA design, i.e., considering the sequence of the siRNA used.
Unfortunately, due to the interferon response, this same approach is unavailable for mammalian systems.
While this effect can be circumvented by bypassing the Dicer cleavage step and directly introducing siRNA, this tactic carries with it the risk that the chosen siRNA sequence may be non-functional or semi-functional.
Unfortunately, none of the reported methods have provided a satisfactory scheme for reliably selecting siRNA with acceptable levels of functionality.

Method used

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  • siRNA targeting minichromosome maintenance deficient 4 (MCM4)
  • siRNA targeting minichromosome maintenance deficient 4 (MCM4)
  • siRNA targeting minichromosome maintenance deficient 4 (MCM4)

Examples

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examples

General Techniques and Nomenclatures

[0437] siRNA nomenclature. All siRNA duplexes are referred to by sense strand. The first nucleotide of the 5′-end of the sense strand is position 1, which corresponds to position 19 of the antisense strand for a 19-mer. In most cases, to compare results from different experiments, silencing was determined by measuring specific transcript mRNA levels or enzymatic activity associated with specific transcript levels, 24 hours post-transfection, with siRNA concentrations held constant at 100 nM. For all experiments, unless otherwise specified, transfection efficiency was ensured to be over 95%, and no detectable cellular toxicity was observed. The following system of nomenclature was used to compare and report siRNA-silencing functionality: “F” followed by the degree of minimal knockdown. For example, F50 signifies at least 50% knockdown, F80 means at least 80%, and so forth. For this study, all sub-F50 siRNAs were considered non-functional.

[0438] C...

example i

Sequences Used to Develop the Algorithm

[0440] Anti-Firefly and anti-Cyclophilin siRNAs panels (FIG. 5a, b) sorted according to using Formula VIII predicted values. All siRNAs scoring more than 0 (formula VIII) and more then 20 (formula IX) are fully functional. All ninety sequences for each gene (and DBI) appear below in Table III.

TABLE IIICyclo1SEQ. ID 0032GUUCCAAAAACAGUGGAUACyclo2SEQ. ID 0033UCCAAAAACAGUCCAUAAUCyclo3SEQ. ID 0034CAAAAACAGUGGAUAAUUUCyclo4SEQ. ID 0035AAAACACUGGAUAAUUUUGCyclo5SEQ. ID 0036AACAGUGGAUAAUUUUGUGCyclo6SEQ. ID 0037CAGUCCAUAAUUUUCUCGCCyclo7SEQ. ID 0038GUGGAUAAUUUUGUGGCCUCyclo8SEQ. ID 0039GGAUAAUUUUGUGGCCUUACyclo9SEQ. ID 0040AUAAUUUUGUGGCCUUAGCCyclo10SEQ. ID 0041AAUUUUGUGGCCUUAGCUACyclo11SEQ. ID 0042UUUUGUGGCCUUAGCUACACyclo12SEQ. ID 0043UUGUGGCCUUAGCUACACGCyclo13SEQ. ID 0044GUGGCCUUAGCUACAGGAGCyclo14SEQ. ID 0045GGCCUUAGCUACAGGACAGCyclo15SEQ. ID 0046CCUUAGCUACAGGAGAGAACyclo16SEQ. ID 0047UUAGCUACAGGAGAGAAAGCyclo17SEQ. ID 0048AGCUACAGGAGAGAAAGGACyclo18SEQ. ID ...

example ii

Validation of the Algorithm Using DBI, Luciferase, PLK, EGFR, and SEAP

[0441] The algorithm (Formula VIII) identified siRNAs for five genes, human DBI, firefly luciferase (fLuc), renilla luciferase (rLuc), human PLK, and human secreted alkaline phosphatase (SEAP). Four individual siRNAs were selected on the basis of their SMARTSCORES™ derived by analysis of their sequence using Formula VIII (all of the siRNAs would be selected with Formula IX as well) and analyzed for their ability to silence their targets' expression. In addition to the scoring, a BLAST search was conducted for each siRNA. To minimize the potential for off-target silencing effects, only those target sequences with more than three mismatches against un-related sequences were selected. Semizarov, et al. (2003) Specificity of short interfering RNA determined through gene expression signatures, Proc. Natl. Acad. Sci. USA, 100:6347. These duplexes were analyzed individually and in pools of 4 and compared with several si...

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Abstract

Efficient sequence specific gene silencing is possible through the use of siRNA technology. By selecting particular siRNAs by rational design, one can maximize the generation of an effective gene silencing reagent, as well as methods for silencing genes. Methods, compositions, and kits generated through rational design of siRNAs are disclosed including those directed to MCM4.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a continuation of U.S. Ser. No. 10 / 940,892, filed Sep. 14, 2004, which is a continuation of PCT Application No. PCT / US 04 / 14885, international filing date May 12, 2004. The disclosures of the priority applications, including the sequence listings and tables submitted in electronic form in lieu of paper, are incorporated by reference into the instant specification.SEQUENCE LISTING [0002] The sequence listing for this application has been submitted in accordance with 37 CFR § 1.52(e) and 37 CFR § 1.821 on CD-ROM in lieu of paper on a disk containing the sequence listing file entitled “DHARMA—2100-US37_CRF.txt” created Mar. 20, 2007, 104 kb. Applicants hereby incorporate by reference the sequence listing provided on CD-ROM in lieu of paper into the instant specification. FIELD OF INVENTION [0003] The present invention relates to RNA interference (“RNAi”). BACKGROUND OF THE INVENTION [0004] Relatively recently, researche...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C12Q1/68C07H21/02C12N15/11C12N15/87G01N33/48G01N33/50G06F19/00G16B20/20G16B20/50
CPCC12N15/111C12N2310/14G06F19/18C12N2330/30C12N2320/11G16B20/00G16B20/50G16B20/20
Inventor KHVOROVA, ANASTASIAREYNOLDS, ANGELALEAKE, DEVINMARSHALL, WILLIAMREAD, STEVENSCARINGE, STEPHEN
Owner DHARMACON INC
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