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Mitochondrial DNA of Hydra attenuata (Cnidaria): A Sequence That Includes an End of One Linear Molecule and the Genes for l-rRNA, tRNAf-Met, tRNATrp, COII, and ATPase8
Authors:Genevieve Pont-Kingdon  Cecile G Vassort  Rahul Warrior  Ronald Okimoto  C Timothy Beagley  David R Wolstenholme
Institution:(1) Department of Biology, University of Utah, Salt Lake City, UT 84112, USA, US;(2) Department of Embryology, Carnegie Institution of Washington, 115 West University Parkway, Baltimore, MD 21210, USA, US
Abstract:The 3231-nucleotide-pair (ntp) sequence of one end of one of the two linear mitochondrial (mt) DNA molecules of Hydra attenuata (phylum Cnidaria, class Hydrozoa, order Anthomedusae) has been determined. This segment contains complete genes for tRNAf-Met, l-rRNA, tRNATrp, subunit 2 of cytochrome c oxidase (COII), subunit 8 of ATP synthetase (ATPase8), and the 5′ 136 ntp of ATPase6. These genes are arranged in the order given and are transcribed from the same strand of the molecule. As in two other cnidarians, the hexacorallian anthozoan Metridium senile and the octocorallian anthozoan Sarcophyton glaucum, the mt-genetic code of H. attenuata is near standard. The only modification appears to be that TGA specifies tryptophan rather than termination. Also as in M. senile and S. glaucum, the encoded H. attenuata mt-tRNAf-Met has primary and secondary structural features resembling those of Escherichia coli initiator tRNAt-Met. As the encoded mt-tRNATrp cannot be folded into a totally orthodox secondary structure, two alternative forms are suggested. The encoded H. attenuata mt-l-rRNA is 1738 nt, which is 451 nt shorter than the M. senile mt-l-rRNA. Comparisons of secondary structure models of these two mt-l-rRNAs indicate that most of the size difference results from loss of nucleotides in the H. attenuata molecule at a minimum of 46 locations, which includes elimination of six distinct helical elements. Received: 9 March 2000 / Accepted: 24 July 2000
Keywords::Hydra attenuata—  Cnidaria —  Mitochondrial genes —  Nucleotide sequences —  Genetic code —  Transfer RNA genes —  Large          ribosomal rRNA gene
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