We are analyzing https://link.springer.com/article/10.1007/s004380000345.

Title:
Variation in sequence and RNA editing within core domains of mitochondrial group II introns among plants | Molecular Genetics and Genomics
Description:
The 3′ regions of several group II introns within the mitochondrial genes nad1 and nad7 show unexpected sequence divergence among flowering plants, and the core domains 5 and 6 are predicted to have weaker helical structure than those in self-splicing group II introns. To assess whether RNA editing improves helical stability by the conversion of A-C mispairs to A-U pairs, we sequenced RT-PCR amplification products derived from excised intron RNAs or partially spliced precursors. Only in some cases was editing observed to strengthen the predicted helices. Moreover, the editing status within nad1 intron 1 and nad7 intron 4 was seen to differ among plant species, so that homologous intron sequences shared lower similarity at the RNA level than at the DNA level. Plant-specific variation was also seen in the length of the linker joining domains 5 and 6 of nad7 intron 3; it ranged from 4 nt in wheat to 11 nt in soybean, in contrast to the 2–4 nt length typical of classical group II introns. However, this intron is excised as a lariat structure with a domain 6 branchpoint adenosine. Our observations suggest that the core structures and sequences of these plant mitochondrial introns are subject to less stringent evolutionary constraints than conventional group II introns.
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Keywords {🔍}

article, editing, intron, rna, introns, group, plant, privacy, cookies, content, mitochondrial, nad, publish, search, core, domains, plants, access, splicing, data, information, log, journal, research, molecular, genetics, variation, sequence, march, carrillo, chapdelaine, bonen, products, discover, springer, optional, personal, parties, policy, main, find, track, general, mgg, published, cite, explore, predicted, helical, structure,

Topics {✒️}

month download article/chapter plant mitochondrial introns plant-specific variation post-transcriptional splicing group ii introns article molecular nascent rna contributes mitochondrial genes nad1 privacy choices/manage cookies plant species rna editing related subjects widespread intron retention full article pdf main content log excised intron rnas weaker helical structure exploring splicing european economic area scope submit manuscript partially spliced precursors stringent evolutionary constraints conditions privacy policy accepting optional cookies canada k1n 6n5 nad7 intron 4 nad7 intron 3 rna level check access instant access editing observed editing status nad1 intron 1 journal finder publish 2–4 nt length typical bonen rights article log information flowering plants article cite privacy policy personal data article carrillo optional cookies manage preferences intron data protection essential cookies cookies skip subscription content

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         headline:Variation in sequence and RNA editing within core domains of mitochondrial group II introns among plants
         description: The 3′ regions of several group II introns within the mitochondrial genes nad1 and nad7 show unexpected sequence divergence among flowering plants, and the core domains 5 and 6 are predicted to have weaker helical structure than those in self-splicing group II introns. To assess whether RNA editing improves helical stability by the conversion of A-C mispairs to A-U pairs, we sequenced RT-PCR amplification products derived from excised intron RNAs or partially spliced precursors. Only in some cases was editing observed to strengthen the predicted helices. Moreover, the editing status within nad1 intron 1 and nad7 intron 4 was seen to differ among plant species, so that homologous intron sequences shared lower similarity at the RNA level than at the DNA level. Plant-specific variation was also seen in the length of the linker joining domains 5 and 6 of nad7 intron 3; it ranged from 4 nt in wheat to 11 nt in soybean, in contrast to the 2–4 nt length typical of classical group II introns. However, this intron is excised as a lariat structure with a domain 6 branchpoint adenosine. Our observations suggest that the core structures and sequences of these plant mitochondrial introns are subject to less stringent evolutionary constraints than conventional group II introns.
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            Plant Genetics and Genomics
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            Microbial Genetics and Genomics
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      headline:Variation in sequence and RNA editing within core domains of mitochondrial group II introns among plants
      description: The 3′ regions of several group II introns within the mitochondrial genes nad1 and nad7 show unexpected sequence divergence among flowering plants, and the core domains 5 and 6 are predicted to have weaker helical structure than those in self-splicing group II introns. To assess whether RNA editing improves helical stability by the conversion of A-C mispairs to A-U pairs, we sequenced RT-PCR amplification products derived from excised intron RNAs or partially spliced precursors. Only in some cases was editing observed to strengthen the predicted helices. Moreover, the editing status within nad1 intron 1 and nad7 intron 4 was seen to differ among plant species, so that homologous intron sequences shared lower similarity at the RNA level than at the DNA level. Plant-specific variation was also seen in the length of the linker joining domains 5 and 6 of nad7 intron 3; it ranged from 4 nt in wheat to 11 nt in soybean, in contrast to the 2–4 nt length typical of classical group II introns. However, this intron is excised as a lariat structure with a domain 6 branchpoint adenosine. Our observations suggest that the core structures and sequences of these plant mitochondrial introns are subject to less stringent evolutionary constraints than conventional group II introns.
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         Microbial Genetics and Genomics
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