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Complete mitochondrial genome sequence of Urechis caupo, a representative of the phylum Echiura

BACKGROUND: Mitochondria contain small genomes that are physically separate from those of nuclei. Their comparison serves as a model system for understanding the processes of genome evolution. Although hundreds of these genome sequences have been reported, the taxonomic sampling is highly biased tow...

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Autor principal: Boore, Jeffrey L
Formato: Texto
Lenguaje:English
Publicado: BioMed Central 2004
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC521484/
https://www.ncbi.nlm.nih.gov/pubmed/15369601
http://dx.doi.org/10.1186/1471-2164-5-67
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author Boore, Jeffrey L
author_facet Boore, Jeffrey L
author_sort Boore, Jeffrey L
collection PubMed
description BACKGROUND: Mitochondria contain small genomes that are physically separate from those of nuclei. Their comparison serves as a model system for understanding the processes of genome evolution. Although hundreds of these genome sequences have been reported, the taxonomic sampling is highly biased toward vertebrates and arthropods, with many whole phyla remaining unstudied. This is the first description of a complete mitochondrial genome sequence of a representative of the phylum Echiura, that of the fat innkeeper worm, Urechis caupo. RESULTS: This mtDNA is 15,113 nts in length and 62% A+T. It contains the 37 genes that are typical for animal mtDNAs in an arrangement somewhat similar to that of annelid worms. All genes are encoded by the same DNA strand which is rich in A and C relative to the opposite strand. Codons ending with the dinucleotide GG are more frequent than would be expected from apparent mutational biases. The largest non-coding region is only 282 nts long, is 71% A+T, and has potential for secondary structures. CONCLUSIONS: Urechis caupo mtDNA shares many features with those of the few studied annelids, including the common usage of ATG start codons, unusual among animal mtDNAs, as well as gene arrangements, tRNA structures, and codon usage biases.
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spelling pubmed-5214842004-10-07 Complete mitochondrial genome sequence of Urechis caupo, a representative of the phylum Echiura Boore, Jeffrey L BMC Genomics Research Article BACKGROUND: Mitochondria contain small genomes that are physically separate from those of nuclei. Their comparison serves as a model system for understanding the processes of genome evolution. Although hundreds of these genome sequences have been reported, the taxonomic sampling is highly biased toward vertebrates and arthropods, with many whole phyla remaining unstudied. This is the first description of a complete mitochondrial genome sequence of a representative of the phylum Echiura, that of the fat innkeeper worm, Urechis caupo. RESULTS: This mtDNA is 15,113 nts in length and 62% A+T. It contains the 37 genes that are typical for animal mtDNAs in an arrangement somewhat similar to that of annelid worms. All genes are encoded by the same DNA strand which is rich in A and C relative to the opposite strand. Codons ending with the dinucleotide GG are more frequent than would be expected from apparent mutational biases. The largest non-coding region is only 282 nts long, is 71% A+T, and has potential for secondary structures. CONCLUSIONS: Urechis caupo mtDNA shares many features with those of the few studied annelids, including the common usage of ATG start codons, unusual among animal mtDNAs, as well as gene arrangements, tRNA structures, and codon usage biases. BioMed Central 2004-09-15 /pmc/articles/PMC521484/ /pubmed/15369601 http://dx.doi.org/10.1186/1471-2164-5-67 Text en Copyright © 2004 Boore; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an open-access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Boore, Jeffrey L
Complete mitochondrial genome sequence of Urechis caupo, a representative of the phylum Echiura
title Complete mitochondrial genome sequence of Urechis caupo, a representative of the phylum Echiura
title_full Complete mitochondrial genome sequence of Urechis caupo, a representative of the phylum Echiura
title_fullStr Complete mitochondrial genome sequence of Urechis caupo, a representative of the phylum Echiura
title_full_unstemmed Complete mitochondrial genome sequence of Urechis caupo, a representative of the phylum Echiura
title_short Complete mitochondrial genome sequence of Urechis caupo, a representative of the phylum Echiura
title_sort complete mitochondrial genome sequence of urechis caupo, a representative of the phylum echiura
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC521484/
https://www.ncbi.nlm.nih.gov/pubmed/15369601
http://dx.doi.org/10.1186/1471-2164-5-67
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