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GrainGenes Reference Report: CUG-25-52

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Reference	CUG-25-52
Title	A unique sequence located downstream from the rice mitochondrial atp6 may cause male sterility
Journal	Current Genetics
Year	1994
Volume	25
Pages	52-58
Author	Akagi H Sakamoto M Shinjyo C Shimada H Fujimura T
Abstract	Asymmetric cell-fusion of the japonica cultivar of Oryza sativa (rice) with cytoplasmic-male-sterile (CMS) plants bearing cytoplasm derived from Chinsurah Boro II resulted in two classes of cytoplasmic hybrids (cybrids), fertile and CMS Southern-blot analysis of the mitochondrial DNA (mtDNA) indicates recombination events around a number of genes; however, the appearance of the CMS character is tightly correlated to reorganization around the atp6 gene, suggesting recombination downstream from the atp6 gene is involved in CMS The nucleotide sequence downstream from atp6 contains a pseudogene which was probably created by recombination of the mitochondrial genome Sense and antisense transcripts of the downstream region of atp6 were found in CMS- and restored CMS (fertile)-lines, but not in the normal (fertile) line In the CMS line, several antisense transcripts of the atp6 gene were also found However, in the restored line which contains a nuclear-encoded gene, Rf-1, the levels of these transcripts were lower than in the CMS line. These results suggest abnormal transcripts of the atp6 gene produced in the antisense direction may be involved in CMS, and that products of the nuclear-encoded restorer gene may reduce abnormal transcription in this region of the mitochondrial genome.
Keyword	[ Hide all but 1 of 15 ] adenosinetriphosphatase antisense rna atp6 gene cytoplasmic male sterility male fertility messenger rna mitochondrial dna molecular sequence data nucleotide sequence oryza sativa pseudogenes recombination restriction fragment length polymorphism rf 1 gene structural genes

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