Efficient genetic modification and germ-line transmission of primordial germ cells using piggyBac and Tol2 transposons.

Proceedings of the National Academy of Sciences of the United States of America
Joni MacdonaldMichael J McGrew

Abstract

The derivation of germ-line competent avian primordial germ cells establishes a cell-based model system for the investigation of germ cell differentiation and the production of genetically modified animals. Current methods to modify primordial germ cells using DNA or retroviral vectors are inefficient and prone to epigenetic silencing. Here, we validate the use of transposable elements for the genetic manipulation of primordial germ cells. We demonstrate that chicken primordial germ cells can be modified in vitro using transposable elements. Both piggyBac and Tol2 transposons efficiently transpose primordial germ cells. Tol2 transposon integration sites were spread throughout both the macro- and microchromosomes of the chicken genome and were more prevalent in gene transcriptional units and intronic regions, consistent with transposon integrations observed in other species. We determined that the presence of insulator elements was not required for reporter gene expression from the integrated transposon. We further demonstrate that a gene-trap cassette carried in the Tol2 transposon can trap and mutate endogenous transcripts in primordial germ cells. Finally, we observed that modified primordial germ cells form functional gamete...Continue Reading

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Aug 21, 2014·Proceedings of the National Academy of Sciences of the United States of America·Tae Sub ParkJae Yong Han
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