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Background  Disruption of mitochondrial genes may become a powerful tool for elucidating precisely the functions of individual mitochondrial genes. However, it is generally difficult to manipulate genetically mitochondrial genes, because 1) a mitochondrion is surrounded by inner and outer membranes, and 2) there are a large number of mtDNA copies in a single cell. This is the reason why we tried to establish a novel method for disrupting a certain mitochondrial gene ( rps4 ), using  Dictyostelium  cells.    Results  Here, we have developed a new method for specifically disrupting a mitochondrial gene ( rps4  ; ribosomal protein subunit S4), by a combination of homologous recombination and delivery of an appropriate restriction endonuclease ( Sfo I) into mitochondria. First, mitochondrially targeted  Sfo I whose expression is under control of the tetracycline (Tet)-regulated gene expression system was introduced into cells heteroplasmic with respect to the  rps4  gene. Then, the heteroplasmic cells were produced by homologous recombination by use of the construct in which the unique  Sfo I site and the 5'-half of the  rps4  coding region were deleted not to be digested by  Sfo I, and therefore their mitochondria have both the wild-type mtDNA and the mutant mtDNA with the disrupted  rps4  gene. In response to removal of Tet from growth medium,  Sfo I was selectively delivered into mitochondria and digested only the wild-type mtDNA but not the mutated  rps4 . Thus one can gain  rps4 -null cells with only the mutated mtDNA, under the Tet-minus condition.    Conclusion  The mitochondrial gene-disruption method presented here must be widely useful for precisely determining the functions of individual mitochondrial genes. This is the first report to demonstrate complete and specific mitochondrial gene disruption.

Establishment of a new method for precisely determining the functions of individual mitochondrial genes, using Dictyostelium cells