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Abstract
4 x$ H* `3 j5 x6 G* dMultiple genetic modifications in pigs can essentially benefit research on agriculture, human disease and xenotransplantation., C: c1 C9 i- y; n+ k
Most multi-transgenic pigs have been produced by complex and time-consuming breeding programs using multiple
1 U6 `+ @4 M8 a6 J, ysingle-transgenic pigs. This study explored the feasibility of producing multi-transgenic pigs using the viral 2A peptide in
+ p$ h0 d9 F% N( f- ?the light of previous research indicating that it can be utilized for multi-gene transfer in gene therapy and somatic cell
6 p5 `6 N- j& F; T# R7 zreprogramming. A 2A peptide-based double-promoter expression vector that mediated the expression of four fluorescent
! ` e R) G" r4 m: Q8 ]proteins was constructed and transfected into primary porcine fetal fibroblasts. Cell colonies (54.3%) formed under G418# u! X1 S! N& a1 k. E: M% w F
selection co-expressed the four fluorescent proteins at uniformly high levels. The reconstructed embryos, which were. e8 H7 g3 {! ~( Y& o- ?- t
obtained by somatic cell nuclear transfer and confirmed to express the four fluorescent proteins evenly, were transplanted% |2 F1 Z# M2 e; e3 [$ h9 [9 S, Z
into seven recipient gilts. Eleven piglets were delivered by two gilts, and seven of them co-expressed the four fluorescent
! U Q8 h% i( S b5 sproteins at equivalently high levels in various tissues. The fluorescence intensities were directly observed at the nose, hoof
7 k* S0 g( u/ c1 f# ^7 b( Land tongue using goggles. The results suggest that the strategy of combining the 2A peptide and double promoters
& @1 s$ J/ t# G: q* L% g: J! Z! wefficiently mediates the co-expression of the four fluorescent proteins in pigs and is hence a promising methodology to5 o- S6 B( `6 z! v+ o( L. @# o
generate multi-transgenic pigs by a single nuclear transfer. |
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