Homologous recombination invoking cox2 is responsible for a mutation in the CMS-specific mitochondrial locus of Petunia

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Homologous recombination invoking cox2 is responsible for a mutation in the CMS-specific mitochondrial locus of Petunia

Year: 

1997

Source of publication :

Molecular and General Genetics

Authors :

האושנר, חגית

;

טביב, יונה

;

יצהר, שמאי

;

פירון, נורית

.

Volume :

255

Co-Authors: 

Yesodi, V., Department of Plant Genetics, Agricultural Research Organization, Volcani Center, Bet Dagan 50 250, Israel
Izhar, S., Department of Plant Genetics, Agricultural Research Organization, Volcani Center, Bet Dagan 50 250, Israel
Hauschner, H., Department of Plant Genetics, Agricultural Research Organization, Volcani Center, Bet Dagan 50 250, Israel
Tabib, Y., Department of Plant Genetics, Agricultural Research Organization, Volcani Center, Bet Dagan 50 250, Israel
Firon, N., Department of Plant Genetics, Agricultural Research Organization, Volcani Center, Bet Dagan 50 250, Israel

From page: 

106

To page: 

114

(

Total pages: 

9

)

Link :

Homologous recombination invoking cox2 is responsible for a mutation in the CMS-specific mitochondrial locus of Petunia

Abstract: 

We have characterized the only mutation detected so far in S-Pcf, the mitochondrial cytoplasmic male sterility (CMS)-specific locus of petunia. This locus consists of three open reading frames (ORFs): the first contains part of atp9, an intron-less cox2 pseudogene (which does not contain the original cox2 ATG) and the unidentified reading frame urf-s; the second and third ORFs correspond to the only copies of nad3 and rpsl2 genes in the genome, respectively. In the cell line R13-138, which was generated from a male-sterile somatic hybrid (line SH13-138), a change in the first ORF of the S-Pcf locus has been characterized: the atp9 sequence has been lost, while exon1 of the normal copy of the cox2 gene (including the original ATG sequence) and the adjacent 5' sequence of the petunia recombination repeat, have been introduced. The data suggest that this reorganization of mtDNA is the consequence of a homologous recombination event involving part of the cox2 coding region, and that the cox2 coding region may serve as an active site for inter- or intra-mtDNA homologous recombination. The results further suggest that in line SH13-I38 (or during its maintenance in tissue culture), segregation of the S-Pcf-containing mtDNA molecules has occurred, and the mutant mtDNA is now predominant in the population.