Abstract
The important differences in physiological parameters and anatomical characteristics of the kidney between humans and mice make it difficult to replicate the precise progression of human renal cystic diseases in gene modification mouse models. In contrast to mice, pigs are a better animal model of human diseases, as they are more similar in terms of organ size, structure, and physiological parameters. Here, we report the generation and initial examination of an AQP2-Cre transgenic (Tg) Chinese miniature (mini)-pig line that expresses Cre recombinase exclusively in kidney collecting duct cells. An 8-kb fragment of the mini-pig aquaporin 2 (AQP2) 5′-flanking region was utilized to direct Cre expression in Tg mini-pigs. Two Tg mini-pigs were generated by pig somatic cell nuclear transfer and both carried the entire coding sequence of Cre recombinase. RT-PCR and western blotting analysis revealed that Cre recombinase was uniquely expressed in the kidney, while immunohistochemical studies located its expression in kidney collecting duct cells. Furthermore, six integration sites and 12–14 copies of the Cre gene were detected in various tissues by high-efficiency thermal asymmetric interlaced PCR and absolute quantitative real-time PCR, respectively. Combined with previous studies of Cre recombinase activity, we believe that this AQP2-Cre Tg mini-pig line will be a useful tool to generate kidney collecting duct cell-specific gene knockout mini-pig models, thereby allowing the investigation of gene functions in kidney development and the mechanisms of human renal cystic disease.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 31201750/C040601). The authors would like to thank Qingkai Guo, Jian Wang, Xue Chen, Peiran Hu and Yong Fang for technical assistance. We thank the members of the Animal Biotechnology laboratory, College of Animal Science, Jilin University, for their helpful discussions during the course of this work.
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Weiwei Luo and Zhanjun Li have contributed equally to this work.
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Luo, W., Li, Z., Huang, Y. et al. Generation of AQP2-Cre transgenic mini-pigs specifically expressing Cre recombinase in kidney collecting duct cells. Transgenic Res 23, 365–375 (2014). https://doi.org/10.1007/s11248-013-9774-8
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DOI: https://doi.org/10.1007/s11248-013-9774-8