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Title: Promoter shuffling at a nuclear gene for mitochondrial RPL27 . Involvement of interchromosome and subsequent intrachromosome recombinations .
Author: Ueda M Arimura S Yamamoto MP Takaiwa F Tsutsumi N Kadowaki K
Journal: Plant Physiol . Citation: V : 141 ( 2 ) P : 702-10 Year: 2006 Type: ARTICLE
Literature: oryza Field: abstract Doc ID: pub16603668 Accession (PMID): 16603668
Abstract: The Reclinomonas americana mitochondrial genome contains a mitochondrial ribosomal protein L27 ( rpl27 ) gene , whereas the rpl27 gene is absent from all plant mitochondrial genomes examined to date . This suggests that plant mitochondrial rpl27 genes have been transferred previously from the mitochondrial genome to the nuclear genome . A nuclear cDNA encoding mitochondrial RPL27 was identified in rice ( Oryza sativa ) . Three similar sequences were identified : rpl27-1 and rpl27-2 on chromosome 8 and rpl27-3 on chromosome 4 . Harr plot analysis suggests that they were generated by inter and intrachromosomal duplications . Interestingly , the transcribed rpl27 gene ( rpl27-1 ) acquired a promoter sequence that was derived from the rice spt16 ( Osspt16 ) gene , the homolog of a global transcription factor in yeast ( Saccharomyces cerevisiae ) located downstream from the rpl27-3 sequence on chromosome 4 , after inter and intrachromosomal recombination . Reverse transcription-PCR and promoter assay revealed that the rpl27 mRNAs were mainly transcribed from rpl27-1 . A repeat of seven nucleotides ( AATAGTT ) was identified at the junction of rpl27-1 and rpl27-2 on chromosome 8 , and the same repeat was also identified at the 5 end of rpl27-2 and the 3 end of rpl27-1 . This repeat ( AATAGTT ) contains the hot-spot sequence AGTT , which is preferentially recognized by topoisomerase I in wheat ( Triticum aestivum ) germ , suggesting the involvement of topoisomerase I in this recombination . We here report the example of promoter shuffling and show that this promoter shuffling resulted from a recent segmental duplication through inter and intrachromosomal recombination events .
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[ Sen. 8, subscore: 2.00 ]: A repeat of seven nucleotides ( AATAGTT ) was identified at the junction of rpl27-1 and rpl27-2 on chromosome 8 , and the same repeat was also identified at the 5 end of rpl27-2 and the 3 end of rpl27-1 .
[ Sen. 4, subscore: 1.00 ]: Three similar sequences were identified : rpl27-1 and rpl27-2 on chromosome 8 and rpl27-3 on chromosome 4 .
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