Molecular Life Sciences

Living Edition
| Editors: Robert D. Wells, Judith S. Bond, Judith Klinman, Bettie Sue Siler Masters, Ellis Bell

Mitochondrial Genomes in Invertebrate Animals

Living reference work entry
DOI: https://doi.org/10.1007/978-1-4614-6436-5_111-2

Synopsis

Animal mtDNA is commonly described as a small, circular molecule, remarkably uniform in size, gene content, and genomic organization. The results of recent studies contradict this view and reveal substantial diversity in animal mtDNA organization. As should be expected, most of this diversity is found in non-bilaterian animals: phyla Cnidaria, Ctenophora, Placozoa, and Porifera, each of which displays a unique mode and tempo of mitochondrial genome evolution. Mitochondrial DNA in the phylum Cnidaria is characterized by low rate of sequence evolution and loss of all but one or two tRNA genes. In addition, linear mitochondrial genome architecture has evolved within this phylum. In the phylum Ctenophora, mtDNA is characterized by small size, high rate of sequence evolution, and loss of at least 24 genes, including all tRNA genes and two protein-coding genes. In the phylum Placozoa, mtDNA is large in size and contains a substantial number of introns. It also displays such unusual...

Keywords

Mitochondrial Genome Genetic Code tRNA Gene Calcareous Sponge Bilaterian Animal 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Ecology, Evolution, and Organismal BiologyIowa State UniversityAmesUSA