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Target Discovery and Validation Reviews and Protocols

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140 Matsumoto, Miyagishi, <strong>and</strong> Taira<br />

selection, <strong>and</strong> puromycin concentration. Initial cell number <strong>and</strong> puromycin concentration<br />

affect screening threshold because selection by antibiotics also affects<br />

knockdown efficiency.<br />

5. MasterMix for one 96-well plate should contain 2.5 mL of Opti-MEM I + 25 µL<br />

of LipofectAMINE 2000 reagent.<br />

6. Puromycin selection is critical because the transfection efficiency is not always 100%.<br />

7. MasterMix for one plate of 96-well plate: 2.5 mL of Opti-MEM I medium, 12.5 µg<br />

of poly(I:C) <strong>and</strong> 37.5 µL of FuGENE6.<br />

8. To select the positive clones correctly, appropriate negative controls should be<br />

included. As negative controls, we use a pcPUR hU6 vector for firefly luciferase<br />

gene <strong>and</strong> a pcPUR U6 vector for Renilla luciferase gene (30).<br />

9. Some proteins may have long half-lives <strong>and</strong> therefore phenotypic changes may<br />

require longer incubation. The cells could be analyzed approx 5 d after the transfection<br />

with siRNA expression library.<br />

References<br />

1. Fire, A., Xu, S., Montgomery, M. K., Kostas, S. A., Driver, S. E., <strong>and</strong> Mello, C. C.<br />

(1998) Potent <strong>and</strong> specific genetic interference by double-str<strong>and</strong>ed RNA in<br />

Caenorhabditis elegans. Nature 391, 806–811.<br />

2. Zamore, P. D. (2001) RNA interference: listening to the sound of silence. Nat.<br />

Struct. Biol. 8, 746–750.<br />

3. Bernstein, E., Caudy, A. A., Hammond, S. M., <strong>and</strong> Hannon, G. J. (2001) Role for<br />

a bidentate ribonuclease in the initiation step of RNA interference. Nature 409,<br />

363–366.<br />

4. Hammond, S. M., Boettcher, S., Caudy, A. A., Kobayashi, R., <strong>and</strong> Hannon, G. J.<br />

(2001) Argonaute2, a link between genetic <strong>and</strong> biochemical analyses of RNAi.<br />

Science 293, 1146–1150.<br />

5. Nykanen, A., Haley, B., <strong>and</strong> Zamore, P. D. (2001) ATP requirements <strong>and</strong> small<br />

interfering RNA structure in the RNA interference pathway. Cell 107, 309–321.<br />

6. Williams, B. R. (1997) Role of the double-str<strong>and</strong>ed RNA-activated protein kinase<br />

(PKR) in cell regulation. Biochem. Soc. Trans. 25, 509–513.<br />

7. Elbashir, S. M., Harborth, J., Lendeckel, W., Yalcin, A., Weber, K., <strong>and</strong> Tuschl, T.<br />

(2001) Duplexes of 21-nucleotide RNAs mediate RNA interference in cultured<br />

mammalian cells. Nature 411, 494–498.<br />

8. Yang, S., Tutton, S., Pierce, E., <strong>and</strong> Yoon, K. (2001) Specific double-str<strong>and</strong>ed<br />

RNA interference in undifferentiated mouse embryonic stem cells. Mol. Cell Biol.<br />

21, 7807–7816.<br />

9. Brummelkamp, T. R., Bernards, R., <strong>and</strong> Agami, R. (2002) A system for stable<br />

expression of short interfering RNAs in mammalian cells. Science 296, 550–553.<br />

10. Lee, N. S., Dohjima, T., Bauer, G., et al. (2002) Expression of small interfering RNAs<br />

targeted against HIV-1 rev transcripts in human cells. Nat. Biotechnol. 20, 500–505.<br />

11. Miyagishi, M. <strong>and</strong> Taira, K. (2002) U6 promoter-driven siRNAs with four uridine<br />

3′ overhangs efficiently suppress targeted gene expression in mammalian cells.<br />

Nat. Biotechnol. 20, 497–500.

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