Tetracycline-dependent Expression of the Human Erythropoietin Gene in Transgenic Chickens

Overview

Journal Transgenic Res

Specialty Molecular Biology

Date 2009 Oct 2

PMID 19795218

Citations 8

Authors

Bon Chul Koo

Mo Sun Kwon

Hyuna Lee

Minjee Kim

Dohyang Kim

Ji Yeol Roh

Yoon-Yub Park

Xiang-Shun Cui

Nam-Hyung Kim

Sung June Byun

Teoan Kim

Affiliations

Soon will be listed here.

Abstract

A critical problem in the production of transgenic animals is the uncontrolled constitutive expression of the foreign gene, which occasionally results in serious physiological disorders in the transgenic animal. In this study, we report successful production of transgenic chickens that express the human erythropoietin (hEPO) gene under the control of a tetracycline-inducible promoter. A recombinant Moloney murine leukemia virus (MoMLV)-based retrovirus vector encapsidated with vesicular stomatitis virus G glycoprotein (VSV-G) was injected beneath the blastoderm of unincubated chicken embryos (stage X). Out of 198 injected eggs, 15 chicks hatched after 21 days of incubation and 14 hatched chicks expressed the vector-encoded hEPO gene when fed doxycycline, a tetracycline derivative, without any significant physiological dysfunctions. The expression of hEPO reverted to the pre-induction state by removing doxycycline from the diet. The biological activity of the hEPO produced in the transgenic chickens was comparable to commercially available CHO cell-derived hEPO. Successful germline transmission of the transgene was also confirmed in G1 transgenic chicks produced from crossing G0 transgenic roosters with non-transgenic hens. Tetracycline-inducible expression of the hEPO gene was also confirmed in the blood and eggs of the transgenic chickens.

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