Successful Suppression of Endogenous α-1,3-Galactosyltransferase Expression by RNA Interference in Pig Embryos Generated In Vitro

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概要

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• RNA interference (RNAi) technology using small interfering RNAs (siRNA) has been widely used as a powerful tool to knock down gene expression in various organisms. In pig preimplantation embryos, no attempt to suppress the target gene expression with such technology has been made. The purpose of this study is to demonstrate that the RNAi technology is useful for suppression of endogenous target gene expression at an early stage of development in pigs. Alpha-1,3-Galactosyltransferase (α-GalT) is an enzyme that creates the Galα1-3Gal (α-Gal) epitope on the cell surface in some mammalian species, and removal of the epitope is considered to be a prerequisite for pig-to-human xenotransplantation. We decided to suppress the endogenous α-GalT mRNA expression in pig early embryos, since reduction of α-GalT synthesis is easily monitored by cytochemical staining with Bandeiraea simplicifolia isolectin-B4, a lectin that specifically binds to the α-Gal epitope, and by RT-PCR analysis. Cytoplasmic microinjection of double-stranded RNA and pronuclear injection of an siRNA expression vector into the embryos generated in vitro resulted in a significant reduction in expression of the α-GalT gene and α-Gal epitope in blastocysts, at which stage the α-Gal epitope is abundantly expressed. Somatic cell nuclear transfer of embryonic fibroblasts stably transfected with an siRNA expression vector also led to a significant reduction in the level of α-GalT mRNA synthesis together with decreased amounts of the α-Gal epitope at the blastocyst stage. These results indicate that the RNAi technology is useful for efficient suppression of a target gene expression during embryogenesis in pigs and suggest the possibility of production of siRNA-expressing pigs for use in xenotransplantation.

著者

• Takao Sonshin

  Laboratory for Bioengineering & Transplantation, Research Center for Life Science Resources, Kagoshi

• Miyoshi Kazuchika

  Laboratory Of Animal Reproduction Faculty Of Agriculture Kagoshima University

• Yoshida Mitsutoshi

  Laboratory Of Animal Reproduction Faculty Of Agriculture Kagoshima University

• Sato Masahiro

  Section Of Gene Expression Regulation Frontier Science Research Center Kagoshima University

• CHI Haiying

  Laboratory of Animal Reproduction, Faculty of Agriculture, Kagoshima University

• YOKOMINE Takaaki

  Laboratory of Frontier Medicine, Frontier Science Research Center, Kagoshima University

• Shinohara Mariko

  Laboratory Of Animal Reproduction Faculty Of Agriculture Kagoshima University

• CHI Haiying

  Laboratory of Animal Reproduction, Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan

• MIYOSHI Kazuchika

  Laboratory of Animal Reproduction, Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan

• SHINOHARA Mariko

  Laboratory of Animal Reproduction, Faculty of Agriculture, Kagoshima University, Kagoshima 890-0065, Japan

• TAKAO Sonshin

  Laboratory of Frontier Medicine, Frontier Science Research Center, Kagoshima University, Kagoshima 890-8544, Japan

• SATO Masahiro

  Section of Gene Expression Regulation, Frontier Science Research Center, Kagoshima University, Kagoshima 890-0065, Japan

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