Influence of time of gene microinjection on development and DNA detection frequency in bovine embryos |
| |
Authors: | Rebecca L Krisher John R Gibbons Rudolfo S Canseco John L Johnson Christopher G Russell D R Notter William H Velander F C Gwazdauskas |
| |
Institution: | (1) Department of Dairy Science, Virginia Polytechnic Institute and State University, 24061-0315 Blacksburg, VA, USA;(2) Department of Anaerobic Microbiology, Virginia Polytechnic Institute and State University, 24061-0315 Blacksburg, VA, USA;(3) Department of Chemical Engineering, Virginia Polytechnic Institute and State University, 24061-0315 Blacksburg, VA, USA;(4) Department of Animal Science, Virginia Polytechnic Institute and State University, 24061-0315 Blacksburg, VA, USA |
| |
Abstract: | The effect of DNA microinjection at various times afterin vitro insemination on DNA detection and survival rates of bovine embryos was investigated. Oocytes were inseminated 24 h after
maturation with frozen/thawed semen prepared with a Percoll separation procedure. At 11, 15 and 19 h after insemination, embryos
were centrifuged to visualize pronuclei and microinjected with a murine whey acidic protein-human protein C genomic DNA construct.
After culture for 7 days on Buffalo Rat Liver cells, embryos were assessed for stage of development and assayed for the presence
of the transgene by polymerase chain reaction. Of zygotes in the 11h after insemination treatment, 16% (25/152) of non-injected
and 7% (11/161) of injected embryos developed to the morula or blastocyst stage. Comparable development of non-injected and
injected embryos treated at 15h after insemination was 15% (23/158) and 4% (6/159) and treated at 19 h after insemination
was 14% (23/162) and 1% (1/165), respectively. Development of injected embryos was greater (p<0.05) when injection was performed at 11 h after insemination compared to 19 h after insemination. Development of non-injected
embryos was greater (p<0.01) than that of injected embryos. There was no difference in transgene detection frequency in embryos of all developmental
states between treatments (53% at 11; 50% at 15; 48% at 19h after insemination). Injected embryos testing positive for the
presence of the transgene exhibited increased development over negative embryos (p<0.01). Greater development efficiencies can be obtained in microinjected bovine embryos when injection is performed early
in pronuclear formation. |
| |
Keywords: | DNA integration transgenics micromanipulation PCR |
本文献已被 SpringerLink 等数据库收录! |
|