The wheat mitochondrial genome contains an ORF showing sequence homology to the gene encoding the subunit 6 of the NADH-ubiquinone oxidoreductase

Haouazine, Najat; Souza, Anete Pereira de; Jubier, Marie-France; Lancelin, Dominique; Delcher, Eric; Lejeune, Bernard

doi:10.1007/bf00040599

Cited by 23 publications

(6 citation statements)

References 35 publications

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“…Complete mt genome sequences were reported for three lower taxa, Cycas taitungensis, a gymnosperm species (cycad) (Chaw et al, 2008) and two bryophyte species, Physcomitrella patens (moss) and Marchantia polymorpha (liverwort) (Terasawa et al, 2007;Oda et al, 1992). The types of the prototype nucleotides at the cereal C-to-T and T-to-C transition sites and those of cycad, moss and liverwort at the corresponding sites were investigated, with those at A-to-G o x 3 1 1 3 0 -0 Subtotal ---10 8 3 10 7 1 0 Total ---120 100 43 78 46 Gualberto et al (1989, 1991) for nad3, nad4, cob, cox2, cox3, atp8 and rps12, Lamattina and Grienenberger (1991 for nad4, Lamattina et al (1993) for nad9, Pereira de Souza et al (1991) for nad5, Haouazine et al (1992) for nad6, Bonen et al (1994) for nad7, Zanlungo et al (1993) for cob, Gray (1989, 1990) for cox2, Begu et al (1990) and Araya et al (1992) for atp9, Faivre-Nitschke et al (2001) for ccmB, Bonnard and Grienenberger (1995) for ccmC, Gonzalez et al (1993) for ccmFN and rps1, Begu et al (1998) for matR, Zhuo and Bonen (1993) for rps7, Takvorian et al (1997) Totally, 326 cereal transition sites were examined (Table 9). Due to alignment difficulties, corresponding nucleotides could not be determined at 58 (18%), 176 (54%) and 171 (52%) sites in the comparisons with cycad, moss and liverwort, respectively.…”

Section: Total Bssmentioning

confidence: 99%

Evolutionary dynamics of wheat mitochondrial gene structure with special remarks on the origin and effects of RNA editing in cereals

et al. 2008

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We investigated the evolutionary dynamics of wheat mitochondrial genes with respect to their structural differentiation during organellar evolution, and to mutations that occurred during cereal evolution. First, we compared the nucleotide sequences of three wheat mitochondrial genes to those of wheat chloroplast, α-proteobacterium and cyanobacterium orthologs. As a result, we were able to (1) differentiate the conserved and variable segments of the orthologs, (2) reveal the functional importance of the conserved segments, and (3) provide a corroborative support for the α-proteobacterial and cyanobacterial origins of those mitochondrial and chloroplast genes, respectively. Second, we compared the nucleotide sequences of wheat mitochondrial genes to those of rice and maize to determine the types and frequencies of base changes and indels occurred in cereal evolution. Our analyses showed that both the evolutionary speed, in terms of number of base substitutions per site, and the transition/transversion ratio of the cereal mitochondrial genes were less than two-fifths of those of the chloroplast genes. Eight mitochondrial gene groups differed in their evolutionary variability, RNA and Complex I (nad) genes being most stable whereas Complex V (atp) and ribosomal protein genes most variable. C-to-T transition was the most frequent type of base change; C-to-G and G-to-C transversions occurred at lower rates than all other changes. The excess of C-to-T transitions was attributed to C-to-U RNA editing that developed in early stage of vascular plant evolution. On the contrary, the editing of C residues at cereal T-to-C transition sites developed mostly during cereal divergence. Most indels were associated with short direct repeats, suggesting intra-and intermolecular recombination as an important mechanism for their origin. Most of the repeats associated with indels were di-or trinucleotides, although no preference was noticed for their sequences. The maize mt genome was characterized by a high incidence of indels, comparing to the wheat and rice mt genomes.

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Section: Total Bssmentioning

confidence: 99%

Evolutionary dynamics of wheat mitochondrial gene structure with special remarks on the origin and effects of RNA editing in cereals

et al. 2008

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“…1991), subunit 3 from tobacco ( nad3 , Lelandais et al . 1996) and subunit 6 from wheat ( nad6 , Haouazine et al . 1992), a fragment containing the ribosomal protein s12 gene and the NADH dehydrogenase subunit 3 gene from Oenothera ( nadrps12 , Schuster et al .…”

Section: Tablementioning

confidence: 99%

How mitochondrial DNA diversity can help to understand the dynamics of wild‐cultivated complexes. The case ofMedicago sativain Spain

et al. 2001

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In order to clarify the relationships (genetic exchange and shared ancestry) between natural and cultivated populations of alfalfa (Medicago sativa L.) in Spain, we investigated the patterns of mitochondrial DNA variation (characterized through restriction fragment length polymorphism) for 248 individuals in seven natural and six cultivated populations of this species. Mitochondrial variation was evidenced in both natural and cultivated populations of M. sativa. Among the seven mitotypes identified in the species, two were specific of the natural populations, a result attesting the fact that the Spanish wild form of M. sativa is an original genetic pool compared to the cultivated one. Other mitotypes were observed in both natural and cultivated populations, suggesting the occurrence of gene flow through seeds from cultivated towards natural populations. Comparisons with previously gathered nuclear and phenotypic data give insights into the different evolutionary forces acting on the different kinds of Spanish natural populations examined so far.

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“…It is found to affect all mitochondrial transcripts whose cDNA sequence l 1001 [23, 41,521 [42] [55] [22,95] [112] [20], nad2 [84], nad3 [39], nad4 [67], nad5 [27], nad6 [47], had7 [14] and nad9 [66].…”

Section: Occurrence and Extent Of Mrna Editing In Plant Mitochondriamentioning

confidence: 99%

RNA editing in plant mitochondria and chloroplasts

Maier¹,

Zeltz²,

Kössel³

et al. 1996

Plant Mol Biol

188

114

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In the mitochondria and chloroplasts of higher plants there is an RNA editing activity responsible for specific C-to-U conversions and for a few U-to-C conversions leading to RNA sequences different from the corresponding DNA sequences. RNA editing is a post-transcriptional process which essentially affects the transcripts of protein coding genes, but has also been found to modify non-coding transcribed regions, structural RNAs and intron sequences. RNA editing is essential for correct gene expression: proteins translated from edited transcripts are different from the ones deduced from the genes sequences and usually present higher similarity to the corresponding non-plant homologues. Initiation and stop codons can also be created by RNA editing. RNA editing has also been shown to be required for the stabilization of the secondary structure of introns and tRNAs. The biochemistry of RNA editing in plant organelles is still largely unknown. In mitochondria, recent experiments indicate that RNA editing may be a deamination process. A plastid transformation technique showed to be a powerful tool for the study of RNA editing. The biochemistry as well as the evolutionary features of RNA editing in both organelles are compared in order to identify common as well as organelle-specific components.

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The wheat mitochondrial genome contains an ORF showing sequence homology to the gene encoding the subunit 6 of the NADH-ubiquinone oxidoreductase

Cited by 23 publications

References 35 publications

Evolutionary dynamics of wheat mitochondrial gene structure with special remarks on the origin and effects of RNA editing in cereals

Evolutionary dynamics of wheat mitochondrial gene structure with special remarks on the origin and effects of RNA editing in cereals

How mitochondrial DNA diversity can help to understand the dynamics of wild‐cultivated complexes. The case ofMedicago sativain Spain

RNA editing in plant mitochondria and chloroplasts

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