Selectable Marker Recycling in the Chloroplast

Overview

Journal Mol Gen Genet

Specialties Genetics
Molecular Biology

Date 1996 Jun 12

PMID 8676881

Citations 56

Authors

N Fischer

O Stampacchia

K REDDING

J D Rochaix

Affiliations

Soon will be listed here.

Abstract

The bacterial gene aadA is an important and widely used selectable marker for manipulation of the chloroplast genome through biolistic transformation. Because no other such marker is available, two strategies for recycling of the aadA cassette have been developed. One utilizes homologous recombination between two direct repeats flanking the aadA cassette to allow its loss under non-selective growth conditions. A second strategy is to perform co-transformation with a plasmid containing a modified, non-essential chloroplast gene and another plasmid in which the aadA cassette disrupts a chloroplast gene known to be essential for survival. Under selective growth conditions the first mutation can be transferred to all chloroplast DNA copies whereas the aadA insertion remains heteroplasmic. Loss of the selectable marker can be achieved subsequently by growing the cells on non-selective media. In both cases it is possible to reuse the aadA cassette for the stepwise disruption or mutagenesis of any gene in the same strain.

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