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  • 1
    Electronic Resource
    Electronic Resource
    Multiple initiation sites for transcription of a gene for subunit 1 of F1-ATPase (atp1) in rice mitochondria (1996)
    Springer
    Current genetics 29 (1996), S. 417-422 
    Details
    ISSN: 1432-0983
    Keywords: Key words Rice mitochondria ; atp1 ; Guanylyltransferase ; Multiple transcription initiation sites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We identified the sites for the initiation of transcription of a gene for subunit 1 of F1-ATPase (atp1) in rice mitochondrial DNA. Capping and ribonuclease protection experiments in vitro, together with primer extension analysis, demonstrated that there were at least eight transcription initiation sites upstream of atp1. One initiation site, expressed most actively, was flanked by a sequence identical to the consensus promotor motif of rice mitochondrial genes. However, the sequences surrounding the other seven initiation sites exhibited no similarity to the consensus sequence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050065
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  • 2
    Electronic Resource
    Electronic Resource
    The gene for a subunit of an ABC-type heme transporter is transcribed together with the gene for subunit 6 of NADH dehydrogenase in rice mitochondria (1996)
    Springer
    Current genetics 29 (1996), S. 412-416 
    Details
    ISSN: 1432-0983
    Keywords: Key words orf240 ; nad6 ; Co-transcription ; Rice mitochondria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We previously identified a chloroplast-derived (ct-derived) sequence of 32 base pairs (bp) in rice mitochondrial DNA that includes a part (30 bp; ψtrnI) of a gene for isoleucine tRNA (CAU) of the chloroplast. Analyzing the ct-derived ψtrnI, we found that an open reading frame (orf240), which was homologous to the gene for a subunit of an ATP-binding cassette-type (ABC-type) heme transporter, namely helC, of Rhodobacter capsulatus, and a gene for subunit 6 of NADH dehydrogenase (nad6) were located upstream of and downstream from the ct-derived ψtrnI, respectively. Northern-blot hybridization and analysis by reverse transcription-polymerase chain reaction (RT-PCR) revealed that both orf240 and nad6 were co-transcribed in rice mitochondria. An analysis of PCR-amplified fragments of the region of orf240/nad6 from the DNA of some Gramineae suggests that the arrangement of orf240/nad6 was generated in the mitochondrial genome of the genus Oryza during evolution after its divergence from the other Gramineae. Most of the transcripts of orf240 are edited, with a change from cytidine to uridine, at 35 positions. Editing of the RNA changes 33 amino-acid residues among the 240 encoded amino-acid residues, suggesting that the orf240 gene is functional in rice mitochondria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050064
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  • 3
    Electronic Resource
    Electronic Resource
    Transcription of plastid-derived tRNA genes in rice mitochondria (1998)
    Springer
    Current genetics 34 (1998), S. 216-220 
    Details
    ISSN: 1432-0983
    Keywords: Key words Plastid-derived tRNA ; Mitochondrial DNA ; Rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Previous investigations located nine of the genes for rice tRNAs on plastid (pt)-derived sequences in mitochondrial DNA. In the present study, we examined whether these genes were also transcribed in rice mitochondria. Northern-blot hybridization revealed that seven of these genes (trnC, trnF, trnH, trnM, trnN, trnS and trnW) are transcribed and are precisely processed to mature tRNAs. One of the other two genes (trnP) is transcribed but cannot be processed efficiently, while the other (trnR), which has 100% identity to the original plastid tRNAArg gene, is not transcribed in rice mitochondria. These results suggest that seven of the nine pt-derived tRNAs may be utilized for the biosynthesis of protein in plant mitochondria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050389
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  • 4
    Electronic Resource
    Electronic Resource
    Multiple initiation sites for transcription of a gene for subunit 1 of F1-ATPase (atp1) in rice mitochondria (1996)
    Springer
    Current genetics 29 (1996), S. 417-422 
    Details
    ISSN: 1432-0983
    Keywords: Rice mitochondria ; atp1 ; Guanylyltransferase ; Multiple transcription initiation sites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We identified the sites for the initiation of transcription of a gene for subunit 1 of F1-ATPase (atp1) in rice mitochondrial DNA. Capping and ribonuclease protection experiments in vitro, together with primer extension analysis, demonstrated that there were at least eight transcription initiation sites upstream ofatp1. One initiation site, expressed most actively, was flanked by a sequence identical to the consensus promotor motif of rice mitochondrial genes. However, the sequences surrounding the other seven initiation sites exhibited no similarity to the consensus sequence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02221508
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  • 5
    Electronic Resource
    Electronic Resource
    The gene for a subunit of an ABC-type heme transporter is transcribed together with the gene for subunit 6 of NADH dehydrogenase in rice mitochondria (1996)
    Springer
    Current genetics 29 (1996), S. 412-416 
    Details
    ISSN: 1432-0983
    Keywords: orf240 ; nad6 ; Co-transcription ; Rice mitochondria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We previously identified a chloroplast-derived (ct-derived) sequence of 32 base pairs (bp) in rice mitochondrial DNA that includes a part (30 bp; ψtrnI) of a gene for isoleucine tRNA (CAU) of the chloroplast. Analyzing the ct-derived ψtrnI, we found that an open reading frame (orf240), which was homologous to the gene for a subunit of an ATP-binding cassette-type (ABC-type) heme transporter, namelyhelC, ofRhodobacter capsulatus, and a gene for subunit 6 of NADH dehydrogenase (nad6) were located upstream of and downstream from the ct-derived ψtrnI, respectively. Northern-blot hybridization and analysis by reverse transcription-polymerase chain reaction (RT-PCR) revealed that bothorf240 andnad6 were co-transcribed in rice mitochondria. An analysis of PCR-amplified fragments of the region oforf240/nad6 from the DNA of some Gramineae suggests that the arrangement oforf240/nad6 was generated in the mitochondrial genome of the genusOryza during evolution after its divergence from the other Gramineae. Most of the transcripts oforf240 are edited, with a change from cytidine to uridine, at 35 positions. Editing of the RNA changes 33 amino-acid residues among the 240 encoded amino-acid residues, suggesting that theorf240 gene is functional in rice mitochondria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02221507
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  • 6
    Electronic Resource
    Electronic Resource
    The rps3-rpl16-nad3-rps12 gene cluster in rice mitochondrial DNA is transcribed from alternative promoters (1995)
    Springer
    Current genetics 27 (1995), S. 184-189 
    Details
    ISSN: 1432-0983
    Keywords: Rice mtDNA ; rps3/rpl16/nad3/rps12 ; Co-transcription ; Promoter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The two gene clusters rps3-rpl16 and nad3-rps12 are separated from each other in the mitochondrial genome and are expressed as the individual transcription units in many plants. In rice mitochondrial DNA (mtDNA), the four genes rps3, rpl16, nad3 and rps12 are located within a region of 6 kbp. Northern-blot analysis revealed that a large transcript (6.6 kb) hybridized to both the rps3-rpl16 and the nad3-rps12 gene clusters. Using RT-PCR, we amplified a fragment of anticipated size (790 bp) from two primers that corresponded to sequences in the coding regions of rpl16 and nad3, demonstrating that at least two of the four genes, namely rpl16 and nad3, were co-transcribed. These results together indicated that all four genes, namely, rps3, rpl16, nad3 and rps12, were co-transcribed in rice mitochondria. Transcription initiation sites were determined by an in vitro capping/ribonuclease protection assay and primer extension analysis. Two initiation sites were identified in the rps3-rpl16-nad3-rps12 gene cluster: one was located upstream of rps3 and the other was located between rpl16 and nad3. This evidence indicates that the rps3-rpl16-nad3-rps12 gene cluster is transcribed from two alternative promoters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00313433
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  • 7
    Electronic Resource
    Electronic Resource
    Evolutionary variations in DNA sequences transferred from chloroplast genomes to mitochondrial genomes in the Gramineae (1994)
    Springer
    Current genetics 26 (1994), S. 512-518 
    Details
    ISSN: 1432-0983
    Keywords: Gramineae ; DNA transfer ; Organelle genomes ; Structural rearrangements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The transfer of fragments of DNA from chloroplast genomes to mitochondrial genomes is considered to be a general phenomenon in higher plants. In the present study, Southern hybridization, together with amplification by PCR and DNA sequencing techniques, was used to examine the regions homologous to chloroplast rps19 in the mitochondrial genomes of several gramineous plants. In all the mitochondrial DNAs from the gramineous plants examined, except for that from wheat, the transferred fragments of chloroplast DNA were found to be maintained and the same junctions of mitochondrion-specific and chloroplast-like sequences were found at one terminus. This finding indicates that the transfer of the chloroplast sequence occurred in the distant past during the evolution of gramineous plants. Subsequent analysis revealed that the fragments had been variously rearranged among species with respect to the other terminus. Considering the current diversity of this one particular transferred fragment of chloroplast DNA, we propose that chloroplast-derived DNA sequences that have lost their original functions tend to be rearranged during evolution in mitochondrial genomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309942
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  • 8
    Electronic Resource
    Electronic Resource
    Maintenance of chloroplast-derived sequences in the mitochondrial DNA of Gramineae (1997)
    Springer
    Current genetics 32 (1997), S. 413-419 
    Details
    ISSN: 1432-0983
    Keywords: Key words Chloroplast-derived (ct-derived) sequence ; Mitochondrial DNA (mtDNA) ; Gramineae ; Variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Evidence for the transfer of DNA from the chloroplast to the mitochondrion has been reported in many higher plants and, in most cases, the transferred chloroplast genes do not have the ability to encode functional products as a consequence of base substitutions and/or multiple rearrangements. We reported previously that the sequence of one end of a chloroplast-derived (ct-derived) fragment of DNA that contained the rps19 and trnH genes has been maintained in most gramineous plants and that its presence seems to be correlated with gene expression in this region. In the present study, we have investigated whether or not the ct-derived sequences in mitochondrial DNA (mtDNA) from some gramineous plants and species of Oryza are conserved, and whether or not such conservation is related to gene expression in these regions. We identified two junctions between ct-derived and mitochondrial sequences that were conserved among some gramineous plants. Around these regions, we found a ct-derived gene for tRNA and the promoter of a mitochondrial gene on the ct-derived sequences, respectively, and these regions were transcribed through the junctions. This result indicates that the junctions and/or regions that are transcribed and functional in mitochondria have been strongly conserved and maintained during their evolution. In Oryza, some junctions between ct-derived and mitochondrial sequences were conserved and other junctions were not. These variations seem to have been caused by deletions and/or rearrangements, and appear to be specific to the type of genome. In the case of Oryza, the timing of deletions and/or rearrangements of ct-derived sequences is likely to have coincided with the divergence of the various genome types.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050296
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  • 9
    Electronic Resource
    Electronic Resource
    A chloroplast derived trnH gene is expressed in the mitochondrial genome of gramineous plants (1997)
    Springer
    Plant molecular biology 34 (1997), S. 353-356 
    Details
    ISSN: 1573-5028
    Keywords: chloroplast-derived trnH ; chloroplast genome ; DNA transfer ; gene expression ; Gramineae ; mitochondrial genome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We reported previously that the mitochondrial sequence that contains the chloroplast-derived trnH gene has been highly conserved in the region around one terminus of the junction between chloroplast-derived and mitochondrion-specific sequences in most of the gramineous plants analyzed [15]. The results of RT-PCR, northern hybridization, in vitro capping and ribonuclease protection experiments show that the chloroplast-derived trnH gene is transcribed from a putative promoter that is located in the mitochondrion-specific sequence. Gene expression in this region seems to be correlated with the conservation of the sequence at the junction between the chloroplast-derived fragment and the mitochondrion-specific sequence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005828728036
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  • 10
    Electronic Resource
    Electronic Resource
    A small repeated sequence contains the transcription initiation sites for both trnfM and rrn26 in rice mitochondria (1995)
    Springer
    Plant molecular biology 28 (1995), S. 343-346 
    Details
    ISSN: 1573-5028
    Keywords: Mitochondrial DNA ; promoter ; rice ; rrn26 ; small repeated sequences ; trnfM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The 76 bp sequence found in the upstream region of a gene for 26S rRNA (rrn26) is duplicated in the upstream region of a gene for initiator methionine tRNA (trnfM) in the mitochondrial genome of rice. An in vitro capping/ribonuclease protection assay and primer extension analysis demonstrated that the transcription of trnfM and of rrn26, which are at least 190 kb from one another in the rice mitochondrial genome, starts from these same sequences in the upstream regions of the respective genes. This result indicates that the short sequence that is duplicated in the upstream regions of trnfM and rrn26 in rice mtDNA is recognized as the promoter of each respective gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020253
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