Start Date: Dec 15, 2010
End Date: Dec 14, 2012
New TRECS vectors with isolated enhancer-blocking insulators and promoters will be made and introduced into tobacco plants. Gene excision efficiency will be analyzed, compared, and evaluated in transgenic lines. The genetic and genomic factors that influence gene excision efficiency will be analyzed in detail. The gene excision efficiency will be further improved by testing different nuclear-localization signals and the identified genomic (e.g. location, chromain structure and change) factors. The gene excision events will be monitored and detected by PCR amplification and Southern blot in T0 and T1 generations. The chosen plants with the desired excision efficiency will be grown under different temperature regions in controlled growth chambers for evaluation of TRECS' stability and efficiency.