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- W2079471837 abstract "One of the main focus areas in transgenesis is the choice of a promoter driving stable expression over time of the gene of interest. Besides promoter identity, the genomic environment of the transgene plays a pivotal role in transcription regulation. Studies in higher mammals describing transgene expression from a defined locus are very limited. We set out to determine the expression pattern of two transgene promoters, the human PDGFβ and the viral SV40, in a single cassette positioned in the largest intron of the porcine GLIS3 locus. The PDGFβ promoter drives a variant of the amyloid precursor protein gene named APP695sw and the SV40 promoter drives the neomycin resistant gene, Neo. The nested gene scenario was investigated in three transgenic cloned pigs sacrificed at 3 months, 2 years and 3 years of age. With identical genetic make-up and same environment, the three individual pigs are considered representative of 3 year lifespan of a single pig. Selected organs from the pigs were analyzed by quantitative RT-PCR for transgene promoter activity as well as endogenous GLIS3 promoter activity. No apparent effect of the transgene cassette was observed on endogenous GLIS3 expression. In addition, one year old homozygous pigs showed no phenotypic signs of dysfunctional GLIS3. Both transgene promoters showed and retained their tissue specificity with stable expression over time. Our study indicates that transgenes inserted in a nested situation might be applicable for faithful and long term transgene expression." @default.
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- W2079471837 date "2012-07-01" @default.
- W2079471837 modified "2023-10-08" @default.
- W2079471837 title "Expression pattern of a single transgene cassette located in endogenous GLIS3 of cloned pigs; a nested situation" @default.
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- W2079471837 doi "https://doi.org/10.1016/j.gene.2012.04.041" @default.
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