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Open AccessArticle

Targeted Gene Knockin in Porcine Somatic Cells Using CRISPR/Cas Ribonucleoproteins

Department of Animal and Avian Sciences, University of Maryland, College Park, MD 20742, USA
Animal Bioscience and Biotechnology Laboratory, USDA-ARS, Beltsville, MD 20705, USA
Livestock Genomix, Reisterstown, MD 21136, USA
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Izuho Hatada
Int. J. Mol. Sci. 2016, 17(6), 810;
Received: 1 May 2016 / Revised: 19 May 2016 / Accepted: 19 May 2016 / Published: 26 May 2016
(This article belongs to the Special Issue Genome Editing)
The pig is an ideal large animal model for genetic engineering applications. A relatively short gestation interval and large litter size makes the pig a conducive model for generating and propagating genetic modifications. The domestic pig also shares close similarity in anatomy, physiology, size, and life expectancy, making it an ideal animal for modeling human diseases. Often, however, the technical difficulties in generating desired genetic modifications such as targeted knockin of short stretches of sequences or transgenes have impeded progress in this field. In this study, we have investigated and compared the relative efficiency of CRISPR/Cas ribonucleoproteins in engineering targeted knockin of pseudo attP sites downstream of a ubiquitously expressed COL1A gene in porcine somatic cells and generated live fetuses by somatic cell nuclear transfer (SCNT). By leveraging these knockin pseudo attP sites, we have demonstrated subsequent phiC31 integrase mediated integration of green fluorescent protein (GFP) transgene into the site. This work for the first time created an optimized protocol for CRISPR/Cas mediated knockin in porcine somatic cells, while simultaneously creating a stable platform for future transgene integration and generating transgenic animals. View Full-Text
Keywords: CRISPR/Cas; SCNT; cloning; knockin; TARGATT pig; transegenic CRISPR/Cas; SCNT; cloning; knockin; TARGATT pig; transegenic
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Park, K.-E.; Park, C.-H.; Powell, A.; Martin, J.; Donovan, D.M.; Telugu, B.P. Targeted Gene Knockin in Porcine Somatic Cells Using CRISPR/Cas Ribonucleoproteins. Int. J. Mol. Sci. 2016, 17, 810.

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