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

BMC Genomics
Jeffrey L Boore

Abstract

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. 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. 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.

References

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Citations

Sep 1, 2005·Development Genes and Evolution·Andreas WanningerBernard M Degnan
Aug 14, 2012·Genetics and Molecular Biology·Xiao-Xin BiAi-Yun Wang
Jan 6, 2007·International Journal of Biological Sciences·Wan-ru HouSu-rong Shuai
Mar 13, 2014·Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis·Liangliang ZhangJiangping Qiu
Feb 14, 2014·Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis·Yunling XuPan Lv
Feb 3, 2016·Scientific Reports·Liangliang ZhangJiangping Qiu
Aug 15, 2015·Genetics and Molecular Biology·Yi ZouLing Huang
Feb 20, 2018·Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis·Yuanqiu DongLizhi Zhou
Apr 7, 2018·Molecular Phylogenetics and Evolution·Yanjie ZhangJian-Wen Qiu
Jan 8, 2011·Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics·Xin ShenBin Liu

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BETA
AY619711

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