PLoS ONE (Jan 2021)

Improving germline transmission efficiency in chimeric chickens using a multi-stage injection approach.

  • Danial Naseri,
  • Kianoush Dormiani,
  • Mehdi Hajian,
  • Farnoosh Jafarpour,
  • Mahboobeh Forouzanfar,
  • Naeimeh Karimi,
  • Mohammad Hossein Nasr-Esfahani

DOI
https://doi.org/10.1371/journal.pone.0247471
Journal volume & issue
Vol. 16, no. 6
p. e0247471

Abstract

Read online

Although different strategies have been developed to generate transgenic poultry, low efficiency of germline transgene transmission has remained a challenge in poultry transgenesis. Herein, we developed an efficient germline transgenesis method using a lentiviral vector system in chickens through multiple injections of transgenes into embryos at different stages of development. The embryo chorioallantoic membrane (CAM) vasculature was successfully used as a novel route of gene transfer into germline tissues. Compared to the other routes of viral vector administration, the embryo's bloodstream at Hamburger-Hamilton (HH) stages 14-15 achieved the highest rate of germline transmission (GT), 7.7%. Single injection of viral vectors into the CAM vasculature resulted in a GT efficiency of 2.7%, which was significantly higher than the 0.4% obtained by injection into embryos at the blastoderm stage. Double injection of viral vectors into the bloodstream at HH stages 14-15 and through CAM was the most efficient method for producing germline chimeras, giving a GT rate of 13.6%. The authors suggest that the new method described in this study could be efficiently used to produce transgenic poultry in virus-mediated gene transfer systems.