CD163双等位基因编辑猪的制备及传代

doi:10.3864/j.issn.0578-1752.2018.04.016

Abstract

Abstract: 【Objective】 Porcine reproductive and respiratory syndrome (PRRS), commonly known as “blue ear disease”, is a highly fatal infectious disease with porcine reproductive and respiratory syndrome virus (PRRSV) being the causative pathogen. PRRSV causes major economic losses in the pork industry world-wide. The genetic variability of PRRSV is high and an ideal vaccine to prevent the occurrence of this disease is not available. Cluster of differentiation 163 (CD163) is the important receptor for the entry of PRRSV into the porcine alveolar macrophage (PAM) cells. The aim of this study was to generate CD163 gene edited Large White pigs by using the CRISPR / Cas9 and somatic cell nuclear transfer (SCNT) techniques.【Method】 CRISPR/Cas9 vector was constructed for editing the exon 7 of the porcine CD163 gene; The constructed vectors were transfected into pig fetal fibroblasts to obtain gene edited positive cell colonies; CD163 gene edited fibroblasts and in vitro matured porcine oocytes were employed as nuclear donors and nuclear receptors respectively to obtain reconstructed embryos; For obtaining CD163 gene edited pigs the reconstructed embryos ere transferred into recipient sows and performing the subsequent propagation experiment. 【Result】 The designed gRNAcould effectively recognize the intended site. Genotyping analysis of cloned cell showed that 21 colonies had mutations in the CD163 gene, of which 14 colonies had either a monoallelic mutation or a biallelic heterozygous mutation, and 7 colonies had a biallelic homozygous mutation. Through SCNT, we successfully obtained CD163 biallelic edited Large White pigs. Successful breeding allowed us to obtain F₁ generation CD163 gene edited piglets, and they are all in good health. It is anticipated that more F₁ piglets will be produced soon. 【Conclusion】The CD163 biallelic edited Large White pigs that do not harbor a drug resistant gene in their genome were produced and they can thus safely and quickly serve as a gene donor for breeding of PRRSV resistant pigs.

Key words: CD163, CRISPR/Cas9, pig, PRRS

WEI YingHui, LIU ZhiGuo, XU Kui, Evanna HUYHN, Paul DYCE, LI JiLiang, ZHOU WeiLiang, DONG ShuRen, FENG BaoLiang, MU YuLian, JuLang LI, LI Kui. Generation and Propagation of Cluster of Differentiation 163 Biallelic Gene Editing Pigs[J].Scientia Agricultura Sinica, 2018, 51(4): 770-777.

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Generation and Propagation of Cluster of Differentiation 163 Biallelic Gene Editing Pigs

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