Abstract
Transgenic avian bioreactors produce therapeutic recombinant proteins in egg white. To date, however, methods for transgenic modification of the avian genome or determining transgenic status of individual birds are scarce. The dual, but interrelated, goals of this research were to: (1) develop a method of detecting stable DNA insertion into Japanese quail; and (2) provide a method for gene location on avian chromosomes. We created Teflon-coated coverslip slides to facilitate laser pressure catapulting of avian chromosomes for DNA amplification and nucleotide sequencing. Transgenic G2 Japanese quail, containing germline incorporation of proinsulin, were identified by isolation of chromosomes using laser microdissection and laser pressure catapulting. Subsequent amplification of each chromosome identified 2–5 chromosomes with the proinsulin transgene inserted. Nucleotide sequencing of each chromosomal insertion was identical to the proinsulin portion of the original vector. By applying laser pressure catapulting and PCR of individual chromosomes, we were able to determine that the transgene correctly inserted into avian chromosomes and that the majority of the insertions occurred within microchromosomes. Because many potential therapeutic transgenes have similar or nearly identical nucleotide sequence to the host’s native gene, laser microdissection and subsequent analysis may be required for detailed documentation of transgene expression before proceeding with transgenic protein production.
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McNally, L.R., Henk, W.G. & Cooper, R.K. Chromosomal localization of a proinsulin transgene in Japanese quail by laser pressure catapulting. Transgenic Res 15, 427–433 (2006). https://doi.org/10.1007/s11248-006-0013-4
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DOI: https://doi.org/10.1007/s11248-006-0013-4