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The mitochondrial ribosomal RNA genes of the nematodes Caenorhabditis elegans and Ascaris suum: Consensus secondary-structure models and conserved nucleotide sets for phylogenetic analysis

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Abstract

The small- and large-subunit mitochondrial ribosomal RNA genes (mt-s-rRNA and mt-1-rRNA) of the nematode worms Caenorhabditis elegans and Ascaris suum encode the smallest rRNAs so far reported for metazoa. These size reductions correlate with the previously described, smaller, structurally anomalous mt-tRNAs of C. elegans and A. suum. Using primer extension analysis, the 5′ end nucleotides of the mt-s-rRNA and mt-1-rRNA genes were determined to be adjacent to the 3′ end nucleotides of the tRNAGlu and tRNAHis genes, respectively. Detailed, consensus secondary-structure models were constructed for the mt-s-rRNA genes and the 3′ 64% of mt-1-rRNA genes of the two nematodes. The mt-s-rRNA secondary-structure model bears a remarkable resemblance to the previously defined universal core structure of E. coli 16S rRNA: most of the nucleotides that have been classified as variable or semiconserved in the E. coli model appear to have been eliminated from the C. elegans and A. suum sequences. Also, the secondary structure model constructed for the 3′ 64% of the mt-1-rRNA is similar to the corresponding portion of the previously defined E. coli 23S rRNA core secondary structure. The proposed C. elegans/A. suum mt-s-rRNA and mt-1-rRNA models include all of the secondary-structure element-forming sequences that in E. coli rRNAs contain nucleotides important for A-site and P-site (but not E-site) interactions with tRNAs. Sets of apparently homologous sequences within the mt-s-rRNA and mt-1-rRNA core structures, derived by alignment of the C. elegans and A. suum mt-rRNAs to the corresponding mt-rRNAs of other eukaryotes, and E. coli rRNAs were used in maximum-likelihood analyses. The patterns of divergence of metazoan phyla obtained show considerable agreement with the most prevalent metazoan divergence patterns derived from more classical, morphological, and developmental data.

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Authors and Affiliations

  1. Department of Biology, University of Utah, 84112, Salt Lake City, UT, USA

    Ronald Okimoto, Jane L. Macfarlane & David R. Wolstenholme

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  1. Ronald Okimoto
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  2. Jane L. Macfarlane
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  3. David R. Wolstenholme
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Correspondence to: D.R. Wolstenholme

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Okimoto, R., Macfarlane, J.L. & Wolstenholme, D.R. The mitochondrial ribosomal RNA genes of the nematodes Caenorhabditis elegans and Ascaris suum: Consensus secondary-structure models and conserved nucleotide sets for phylogenetic analysis. J Mol Evol 39, 598–613 (1994). https://doi.org/10.1007/BF00160405

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  • DOI: https://doi.org/10.1007/BF00160405

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