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United States Department of Agriculture

Agricultural Research Service

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Research Project: Utilization of Founder Lines for Improved Citrus Biotechnology via RMCE

Location: Subtropical Insects and Horticulture Research

Project Number: 6034-21000-014-22-T
Project Type: Trust Fund Cooperative Agreement

Start Date: Oct 1, 2013
End Date: May 1, 2016

The research objectives are to reduce potentially negative effects of transgene insertion and genomic presence. The aim of this proposed research is to investigate the use of novel unidirectional recombinases Bxbl, CinH. ParA and phiC31 to implement a Recombinase-Mediate Cassette Exchange (RMCE) technique for precise integration with simultaneous marker removal. 1. To test the newly generated transgenic founder citrus Carrizo citrange lines containing the RMCE genetic platform for precise targeting. 2. To demonstrate that the dual unidirectional RMCE can be exchanged for constructs with desirable transgenes in Carrizo citrange.

Transgenic Carrizo citrange founder lines have been generated containing the selection gene cassette flanked by fused recognition sites. Single copy-number, highly expressing lines will be selected. An exchange vector will be transformed into the various Carrizo citrange founder lines. Recombinase mediated cassette exchange will be examined by negative selection and used to score the most effective pairs. The most effective Carrizo citrange founder lines and recombinase pairs will be published and made publicly available.

Last Modified: 10/16/2017
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