A transgenic pig model expressing a CMV-ZsGreen1 reporter across an extensive array of tissues

Desaulniers Amy T.; Cederberg Rebecca A.; Carreiro Elizabeth P.; Gurumurthy Channabasavaiah B.; White Brett R.

doi:10.7555/JBR.34.20200111

Desaulniers Amy T., Cederberg Rebecca A., Carreiro Elizabeth P., Gurumurthy Channabasavaiah B., White Brett R.. A transgenic pig model expressing a CMV-ZsGreen1 reporter across an extensive array of tissues[J]. The Journal of Biomedical Research, 2021, 35(2): 163-173. DOI: 10.7555/JBR.34.20200111

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Since genetic engineering of pigs can benefit both biomedicine and agriculture, selecting a suitable gene promoter is critically important. The cytomegalovirus (CMV) promoter, which can robustly drive ubiquitous transgene expression, is commonly used at present, yet recent reports suggest tissue-specific activity in the pig. The objective of this study was to quantify ZsGreen1 protein (in lieu of CMV promoter activity) in tissues from pigs harboring a CMV-ZsGreen1 transgene with a single integration site. Tissue samples (n=35) were collected from neonatal hemizygous (n=3) and homozygous (n=3) piglets and ZsGreen1 abundance was determined via immunoblotting. ZsGreen1 was detected in all tissues, except hypothalamus, kidney cortex and oviduct. The expression patterns of homozygous and hemizygous piglets were similar (P>0.05). However, quantification revealed that ZsGreen1 protein levels were tissue-specific. Within neural/endocrine tissues, ZsGreen1 abundance was highest in the anterior pituitary gland, intermediate in the cerebellum and lowest in the cerebrum, spinal cord and posterior pituitary (P<0.05). In the digestive system, ZsGreen1 was more abundant in the salivary gland than esophagus, stomach, pancreas, duodenum, jejunum, ileum, spleen, colon, gallbladder and liver (P<0.05). Interestingly, ZsGreen1 amounts also differed within an organ (i.e., the right ventricle had 3-fold higher levels than the other heart chambers; P<0.05). These results provide useful information for the use of the CMV promoter to drive transgene expression in the pig. Moreover, this swine model represents a novel resource of ZsGreen1-labeled organs and a valuable tool to advance genome editing research.

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A transgenic pig model expressing a CMV-ZsGreen1 reporter across an extensive array of tissues

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A transgenic pig model expressing a CMV-ZsGreen1 reporter across an extensive array of tissues

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