Methods and compositions for selecting siRNA of improved functionality

a sirna and functionality technology, applied in the field of rna interference, can solve the problems of inability to induce rnai with limited success, inhibiting protein synthesis, and long dsrna being not a viable option for rnai in mammalian systems, and achieve the effect of increasing the efficiency of rnai and increasing the efficacy of sirna

Inactive Publication Date: 2005-11-17
THERMO FISHER SCIENTIFIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] The present invention is directed to increasing the efficiency of RNAi, particularly in mammalian systems. Accordingly, the present invention provides kits, siRNAs and methods for increasing siRNA efficacy.
[0068] The ability to use the above algorithms, which are not sequence or species specific, allows for the cost-effective selection of optimized siRNAs for specific target sequences. Accordingly, there will be both greater efficiency and reliability in the use of siRNA technologies.

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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  • Methods and compositions for selecting siRNA of improved functionality
  • Methods and compositions for selecting siRNA of improved functionality
  • Methods and compositions for selecting siRNA of improved functionality

Examples

Experimental program
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examples

General Techniques and Nomenclatures

[0418] 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.

[0419] ...

example i

Sequences Used to Develop the Algorithm

[0421] 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 0033UCCAAAAACAGUGGAUAAUCyclo3SEQ. ID 0034CAAAAACAGUGGAUAAUUUCyclo4SEQ. ID 0035AAAACAGUGGAUAAUUUUGCyclo5SEQ. ID 0036AACAGUGGAUAAUUUUGUGCyclo6SEQ. ID 0037CAGUGGAUAAUUUUGUGGCCyclo7SEQ. ID 0038GUGGAUAAUUUUGUGGCCUCyclo8SEQ. ID 0039GGAUAAUUUUGUGGCCUUACyclo9SEQ. ID 0040AUAAUUUUGUGGCCUUAGCCyclo10SEQ. ID 0041AAUUUUGUGGCCUUAGCUACyclo11SEQ. ID 0042UUUUGUGGCCUUAGCUACACyclo12SEQ. ID 0043UUGUGGCCUUAGCUACAGGCyclo13SEQ. ID 0044GUGGCCUUAGCUACAGGAGCyclo14SEQ. ID 0045GGCCUUAGCUACAGGAGAGCyclo15SEQ. ID 0046CCUUAGCUACAGGAGAGAACyclo16SEQ. ID 0047UUAGCUACAGGAGAGAAAGCyclo17SEQ. ID 0048AGCUACAGGAGAGAAAGGACyclo18SEQ. ID ...

example ii

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

[0422] 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, Specificity of short interfering RNA determined through gene expression signatures. Proc. Natl. Acad. Sci. U.S.A. 2003, 100:6347. These duplexes were analyzed individually and in pools of 4 and compared with several s...

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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.

Description

REFERENCE TO TABLES SUBMITTED IN ELECTRONIC FORM [0001] In accordance with PCT Administrative Instructions Part 8, Applicant submits a compact disc of tables related to sequences and hereby incorporates by reference the material submitted herewith, on the compact disk labeled COPY 1—TABLES PART DISK 1 / 1, TABLES XII and XIII (provided in triplicate, which copies are identical), in files entitled table-xii.txt, date of creation 26 Apr. 2004, with a size of 110,486 kb, and table-xiii.txt, date of creation 26 Apr. 2004, with a size of 23,146 kb; and in accordance with PCT Administrative Instructions Section 801(a)(i) on the compact disk labeled CRF (with three further copies, which copies are identical) in a file entitled 13608PCT.txt, date of creation 26 Apr. 2004, with a size of 556,776 kb. FIELD OF INVENTION [0002] The present invention relates to RNA interference (“RNAi”). BACKGROUND OF THE INVENTION [0003] Relatively recently, researchers observed that double stranded RNA (“dsRNA”)...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01H1/00A61B17/56A61K48/00C07H21/00C07H21/02C12N15/11C12N15/113C12N15/82C12Q1/68G01N33/48G01N33/50G16B20/20G16B20/50
CPCA61K31/713C12N15/111C12N15/113C12N15/1135C12N15/1136C12N15/1137C12N15/1138C12N2310/14C12N2320/10C12N2320/11C12Y502/01008C12N15/1048C12Y113/12007G16B20/00A61P13/12A61P21/00A61P25/28A61P35/00A61P35/02A61P37/02A61P3/10G16B20/50G16B20/20
Inventor KHVOROVA, ANASTASIAREYNOLDS, ANGELALEAKE, DEVINMARSHALL, WILLIAMREAD, STEVENSCARINGE, STEPHEN
Owner THERMO FISHER SCIENTIFIC INC
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