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HEREDITAS ›› 2011, Vol. 33 ›› Issue (7): 757-762.doi: 10.3724/SP.J.1005.2011.00757

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shRNAs driven by K14 promoter induce tissue-specific RNA interference

DAI Rong1, 2, SHEN Si-Jun1, WAN Peng-Cheng1,2, SHI Guo-Qing1,2, MENG Qing-Yong3, LIU Shou-Ren1,2   

  1. 1. College of Animal Science, Shihezi University, Shihezi 832000, China 2. Breed & Biotechnology Key Laboratory of Sheep in Production and Construction Corps of Xinjiang, Xinjiang Agricultural Reclama-tion Academy, Shihezi 832000, China 3. State Key Laboratory for Agrobiotechnology, China Agricultural University, Beijing 100193, China
  • Received:2010-10-09 Revised:2011-01-26 Online:2011-07-20 Published:2011-07-25
  • Contact: LIU Shou-Ren E-mail:nkyysb@163.com

Abstract: RNA interference is an efficient method for exploring gene function. Accumulating evidence suggests that RNA Pol II promoters can direct cell- or tissue-specific gene silencing. A eGFP-shRNA fusion construct transcribed from an RNA Pol II promoter (K14 promoter) was used to induce gene-specific shRNA silencing of BMP4 gene expression. Re-combinant vectors (pEGFP-C1-shRNA, psiCHECK-BMP4, and pEGFP-K14-shRNA) were constructed. Vectors pEGFP-C1-shRNA and psiCHECK-BMP4 were cotransfected into Hela cells (in vitro) and shRNA-induced inhibi-tion efficiency was tested by a luciferase assay. The results showed that all the six interference sequences inhibited the ex-pression of BMP4 with high efficiency (>60%), and the interference sequence 5# showed the highest efficiency. For in vivo screening of JB6-C41 cells transfected with vector pEGFP-K14-shRNA, the inhibition efficiency was assayed by quantitative RT-PCR and Western blotting analyses. The results showed that the mRNA and protein products of the exoge-nous BMP4 gene were efficiently and specifically inhibited. The efficiency of gene silencing was greater than 60%, except for sequence 3#. The declines in mRNA and protein expression levels were significantly correlated during gene si-lence by the shRNA. This system may be adapted for in vivo shRNA expression and gene silencing. This method may provide a novel approach for the application of RNAi technology in suppressing gene expression in the analysis of the mechanisms of hair follicle development in sheep.

Key words: tissue-specific, RNAi, K14 promoter, fusion construct, transgenic livestock