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Abstract1 ^* F& [; k& E
Multiple genetic modifications in pigs can essentially benefit research on agriculture, human disease and xenotransplantation.
/ n2 U' m# K; X' @Most multi-transgenic pigs have been produced by complex and time-consuming breeding programs using multiple
/ v5 g8 @ D$ k/ Vsingle-transgenic pigs. This study explored the feasibility of producing multi-transgenic pigs using the viral 2A peptide in
8 V5 I, Q4 | n" wthe light of previous research indicating that it can be utilized for multi-gene transfer in gene therapy and somatic cell' b N# c, S5 f" Q0 b0 _
reprogramming. A 2A peptide-based double-promoter expression vector that mediated the expression of four fluorescent
3 v# q7 V( ~; S9 E" T" ?8 I/ |! rproteins was constructed and transfected into primary porcine fetal fibroblasts. Cell colonies (54.3%) formed under G4189 ^, R; R8 j. s+ e7 x* z0 B2 ]
selection co-expressed the four fluorescent proteins at uniformly high levels. The reconstructed embryos, which were
! v4 f( r, G) q6 w% \8 l/ r7 [obtained by somatic cell nuclear transfer and confirmed to express the four fluorescent proteins evenly, were transplanted7 X! C1 V" t2 K: M$ m: Z
into seven recipient gilts. Eleven piglets were delivered by two gilts, and seven of them co-expressed the four fluorescent
X! S6 o" c( Q$ ?0 Vproteins at equivalently high levels in various tissues. The fluorescence intensities were directly observed at the nose, hoof
: W$ g1 y5 h( V. v+ Z, Dand tongue using goggles. The results suggest that the strategy of combining the 2A peptide and double promoters: m* d/ a+ a; E! o' B! h
efficiently mediates the co-expression of the four fluorescent proteins in pigs and is hence a promising methodology to0 t* U# q' I, ~' x4 y+ ]
generate multi-transgenic pigs by a single nuclear transfer. |
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