High-efficiency biolistic transformation of Chlamydomonas mitochondria can be used to insert mutations in complex I genes

Proceedings of the National Academy of Sciences of the United States of America
Claire RemacleNathalie Bonnefoy

Abstract

Mitochondrial transformation of Chlamydomonas reinhardtii has been optimized by using a particle-gun device and cloned mitochondrial DNA or PCR fragments. A respiratory-deficient strain lacking a 1.2-kb mitochondrial DNA region including the left telomere and part of the cob gene could be rescued as well as a double-frameshift mutant in the mitochondrial cox1 and nd1 genes. High transformation efficiency has been achieved (100-250 transformants per microgram of DNA), the best results being obtained with linearized plasmid DNA. Molecular analysis of the transformants suggests that the right telomere sequence can be copied to reconstruct the left telomere by recombination. In addition, both nondeleterious and deleterious mutations could be introduced. Myxothiazol-resistant transformants have been created by introducing a nucleotide substitution into the cob gene. Similarly, an in-frame deletion of 23 codons has been created in the nd4 mitochondrial gene of both the deleted and frameshift recipient strains. These 23 codons are believed to encode the first transmembrane segment of the ND4 protein. This Deltand4 mutation causes a misassembly of complex I, with the accumulation of a subcomplex that is 250-kDa smaller than the wild-ty...Continue Reading

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