Molecular Biology and Evolution 17:519-529 (2000)
© 2000 Society for Molecular Biology and Evolution
Regular Articles |
The Complete Nucleotide Sequence of the Mitochondrial DNA of the Agnathan Lampetra fluviatilis: Bearings on the Phylogeny of Cyclostomes
*Département d'Immunologie, Unité de Biologie Moléculaire du Gène, Institut Pasteur, Paris, France;
Laboratoire de Biologie Moléculaire et Cellulaire, Ecole Normale Supérieure Lyon, France;
Service de Systématique Moléculaire, Institut de Systématique Centre du National de la Recherche Scientifique, Muséum National d'Histoire Naturelle, Paris, France;
and
§Laboratoire de Paléontologie, Muséum National d'Histoire Naturelle, Paris, France
Abstract
There are two competing theories about the interrelationships of craniates: the cyclostome theory assumes that lampreys and hagfishes are a clade, the cyclostomes, whose sister group is the jawed vertebrates (gnathostomes); the vertebrate theory assumes that lampreys and gnathostomes are a clade, the vertebrates, whose sister group is hagfishes. The vertebrate theory is best supported by a number of unique anatomical and physiological characters. Molecular sequence data from 18S and 28S rRNA genes rather support the cyclostome theory, but mtDNA sequence of Myxine glutinosa rather supports the vertebrate theory. Additional molecular data are thus needed to elucidate this three-taxon problem. We determined the complete nucleotide sequence of the mtDNA of the lamprey Lampetra fluviatilis. The mtDNA of L. fluviatilis possesses the same genomic organization as Petromyzon marinus, which validates this gene order as a synapomorphy of lampreys. The mtDNA sequence of L. fluviatilis was used in combination with relevant mtDNA sequences for an approach to the hagfish/lamprey relationships using the maximum-parsimony, neighbor-joining, and maximum-likelihood methods. Although trees compatible with our present knowledge of the phylogeny of craniates can be reconstructed by using the three methods, the data collected do not support the vertebrate or the cyclostome hypothesis. The present data set does not allow the resolution of this three-taxon problem, and new kinds of data, such as nuclear DNA sequences, need to be collected.
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  N. Takezaki, F. Figueroa, Z. Zaleska-Rutczynska, and J. Klein Molecular Phylogeny of Early Vertebrates: Monophyly of the Agnathans as Revealed by Sequences of 35 Genes Mol. Biol. Evol., February 1, 2003; 20(2): 287 - 292. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
H. Escriva, L. Manzon, J. Youson, and V. Laudet Analysis of Lamprey and Hagfish Genes Reveals a Complex History of Gene Duplications During Early Vertebrate Evolution Mol. Biol. Evol., September 1, 2002; 19(9): 1440 - 1450. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. R. Omilian and D. J. Taylor Rate Acceleration and Long-branch Attraction in a Conserved Gene of Cryptic Daphniid (Crustacea) Species Mol. Biol. Evol., December 1, 2001; 18(12): 2201 - 2212. [Abstract] [Full Text] [PDF]
|
|