Targeted insertion of an anti-CD2 monoclonal antibody transgene into the GGTA1 locus in pigs using FokI-dCas9

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Nottle, MB; Salvaris, EJ; Fisicaro, N; McIlfatrick, S; Vassiliev, I; Hawthorne, WJ; O'Connell, PJ; Brady, JL; Lew, AM; Cowan, PJDate
2017-08-16Source Title
Scientific ReportsPublisher
NATURE PUBLISHING GROUPAffiliation
Medicine and RadiologyMedical Biology (W.E.H.I.)
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Nottle, M. B., Salvaris, E. J., Fisicaro, N., McIlfatrick, S., Vassiliev, I., Hawthorne, W. J., O'Connell, P. J., Brady, J. L., Lew, A. M. & Cowan, P. J. (2017). Targeted insertion of an anti-CD2 monoclonal antibody transgene into the GGTA1 locus in pigs using FokI-dCas9. SCIENTIFIC REPORTS, 7 (1), https://doi.org/10.1038/s41598-017-09030-6.Access Status
Open AccessAbstract
Xenotransplantation from pigs has been advocated as a solution to the perennial shortage of donated human organs and tissues. CRISPR/Cas9 has facilitated the silencing of genes in donor pigs that contribute to xenograft rejection. However, the generation of modified pigs using second-generation nucleases with much lower off-target mutation rates than Cas9, such as FokI-dCas9, has not been reported. Furthermore, there have been no reports on the use of CRISPR to knock protective transgenes into detrimental porcine genes. In this study, we used FokI-dCas9 with two guide RNAs to integrate a 7.1 kilobase pair transgene into exon 9 of the GGTA1 gene in porcine fetal fibroblasts. The modified cells lacked expression of the αGal xenoantigen, and secreted an anti-CD2 monoclonal antibody encoded by the transgene. PCR and sequencing revealed precise integration of the transgene into one allele of GGTA1, and a small deletion in the second allele. The cells were used for somatic cell nuclear transfer to generate healthy male knock-in piglets, which did not express αGal and which contained anti-CD2 in their serum. We have therefore developed a versatile high-fidelity system for knocking transgenes into the pig genome for xenotransplantation purposes.
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