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- W2079877120 abstract "Proteasomes are large protein complexes involved in protein degradation in eukaryotes and undergo dynamic redistribution between cellular compartments. Characterising the cellular localization of proteasomes at various stages of development and in response to stimuli is of interest. We hypothesised that porcine proteasomes could be visualised in vivo via a ubiquitously expressed transgene fusion comprising a proteasomal subunit and green florescent protein (GFP). The full-length sequence for porcine PSMA-1 was first constructed in silico from public data and was used to retrieve a GenBank expressed sequence tag (EST) sequence that appeared to be full length (accession CO946059; kind gift from R. S. Prather). Primers were designed to remove the stop codon and create homology for cloning with InFusion (Clontech, Palo Alto, CA, USA). The amplimer was inserted into pCAG-CreGFP (Addgene plasmid 13776) in place of the Cre coding region. The resulting plasmid (pKW14) was screened via restriction digest and sequenced for confirmation. This plasmid was confirmed functional in porcine fetal fibroblasts. After removal of the plasmid backbones, pKW14, a G418 resistance cassette (NEO), and the chicken egg white matrix attachment region were co-electroporated into male fetal fibroblasts (10 μg of total DNA, 5:2:2 ratio, respectively). Cells were grown in DMEM with 10% fetal bovine serum (FBS) and selection was initiated 36 h after transfection. Following 12 days of selection at 400 mg L–1 G418, colonies were screened by epifluorescence. Positive colonies were harvested and confirmed transgenic for all 3 input DNAs. Positive colonies were randomly pooled as sets of 3 independent integration events. Embryos were reconstructed via SCNT and transferred to 2 recipients. The fusion rates were 70 and 78%, respectively, with transfer numbers of 120 and 125 fused couplets being transferred into synchronized recipients on Day 0 of heat. Both recipients became pregnant and delivered 2 piglets each on Day 114 by Caesarean section. One live piglet was produced from each litter. Of the 2 live-born piglets, 1 survived beyond Day 3 and continues to be healthy. Transgenic status was verified by PCR. Expression was confirmed by epifluorescence of GFP-labelled proteasomes. This founder will be used to establish a model to evaluated cellular localization of proteasomes in vivo and in culture." @default.
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- W2079877120 date "2011-01-01" @default.
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- W2079877120 title "334 CONSTRUCTION OF A GENETICALLY ENGINEERED PIG EXPRESSING GREEN FLUORESCENT PROTEIN (GFP)-LABELLED PROTEASOMES" @default.
- W2079877120 doi "https://doi.org/10.1071/rdv23n1ab334" @default.
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