Molecular Biology and Evolution, Vol 15, 1706-1718, Copyright © 1998 by Society for Molecular Biology and Evolution
J Mallatt and J Sullivan
Resolving the interrelationships of three major extant lineages of
vertebrates (hagfishes, lampreys, and gnathostomes) is a particularly
important issue in evolution, because the basal resolution critically
influences our understanding of primitive vertebrate characters. A
consensus has emerged over the last 20 years that lampreys are the sister
group to the gnathostomes and the hagfishes represent an ancient, basal
lineage. This hypothesis has essentially displaced the classical hypothesis
of monophyly of the cyclostomes (lampreys plus hagfishes). To test these
hypotheses, we compared nearly complete ribosomal DNA sequences from each
of these major lineages, as well as those from a cephalochordate and a
urochordate, which represent a paraphyletic outgroup for assessing the
basal vertebrate relationships. For this comparison, 92%-99% complete 28S
rDNA sequences were obtained from the lancelet Branchiostoma floridae, the
hagfish Eptatretus stouti, the lamprey Petromyzon marinus, and
cartilaginous fishes Hydrolagus colliei and Squalus acanthias and were then
analyzed with previously reported 28S and 18S rDNA sequences from other
chordates. We conducted conventional (nonparametric) bootstrap analyses,
under maximum-likelihood, parsimony, and minimum-evolution (using LogDet
distances) criteria, of both 28S and 18S rDNA sequences considered
separately and combined. All these analyses provide moderate to very strong
support for the monophyly of the cyclostomes. Furthermore, the currently
accepted hypothesis of a lamprey-gnathostome clade is moderately rejected
by the Kishino-Hasegawa test (P = 0.099) and resoundingly rejected by
parametric bootstrap tests (P < 0.01) in favor of monophyly of living
cyclostomes. Another significant finding is that the hagfish E. stouti has
the longest 28S rDNA gene known in any organism (> 5,200 nt).
ORIGINAL ARTICLE
28S and 18S rDNA sequences support the monophyly of lampreys and hagfishes
Department of Zoology, Washington State University, Pullman 99164-4236, USA. jmallatt@mail.wsu.edu
CiteULike 
Connotea 
Del.icio.us What's this?
This article has been cited by other articles:
|
|
 |
|
  K. G. Ota and S. Kuratani Cyclostome embryology and early evolutionary history of vertebrates Integr. Comp. Biol., September 1, 2007; 47(3): 329 - 337. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 K. L. Hammond and T. T. Whitfield The developing lamprey ear closely resembles the zebrafish otic vesicle: otx1 expression can account for all major patterning differences Development, April 1, 2006; 133(7): 1347 - 1357. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. E. Blair and S. B. Hedges Molecular Phylogeny and Divergence Times of Deuterostome Animals Mol. Biol. Evol., November 1, 2005; 22(11): 2275 - 2284. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Y.-x. Luan, J. M. Mallatt, R.-d. Xie, Y.-m. Yang, and W.-y. Yin The Phylogenetic Positions of Three Basal-Hexapod Groups (Protura, Diplura, and Collembola) Based on Ribosomal RNA Gene Sequences Mol. Biol. Evol., July 1, 2005; 22(7): 1579 - 1592. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 D. E. G. Briggs and R. A. Fortey Wonderful strife: systematics, stem groups, and the phylogenetic signal of the Cambrian radiation Paleobiology, June 1, 2005; 31(2_Suppl): 94 - 112. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Sullivan, Z. Abdo, P. Joyce, and D. L. Swofford Evaluating the Performance of a Successive-Approximations Approach to Parameter Optimization in Maximum-Likelihood Phylogeny Estimation Mol. Biol. Evol., June 1, 2005; 22(6): 1386 - 1392. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 H. Bartels and I. C. Potter Cellular composition and ultrastructure of the gill epithelium of larval and adult lampreys: Implications for osmoregulation in fresh and seawater J. Exp. Biol., September 15, 2004; 207(20): 3447 - 3462. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
Y. Murakami, M. Pasqualetti, Y. Takio, S. Hirano, F. M. Rijli, and S. Kuratani Segmental development of reticulospinal and branchiomotor neurons in lamprey: insights into the evolution of the vertebrate hindbrain Development, March 1, 2004; 131(5): 983 - 995. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. Fan and Q.-Y. Xiang Phylogenetic analyses of Cornales based on 26S rRNA and combined 26S rDNA-MATK-RBCL sequence data Am. J. Botany, September 1, 2003; 90(9): 1357 - 1372. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
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]
|
|
|
|
|
|
K. Lariviere, L. MacEachern, V. Greco, G. Majchrzak, S. Chiu, G. Drouin, and V. L. Trudeau GAD65 and GAD67 Isoforms of the Glutamic Acid Decarboxylase Gene Originated Before the Divergence of Cartilaginous Fishes Mol. Biol. Evol., December 1, 2002; 19(12): 2325 - 2329. [Full Text] [PDF]
|
|
|
|
|
|
C. J. Winchell, J. Sullivan, C. B. Cameron, B. J. Swalla, and J. Mallatt Evaluating Hypotheses of Deuterostome Phylogeny and Chordate Evolution with New LSU and SSU Ribosomal DNA Data Mol. Biol. Evol., May 1, 2002; 19(5): 762 - 776. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Mallatt and C. J. Winchell Testing the New Animal Phylogeny: First Use of Combined Large-Subunit and Small-Subunit rRNA Gene Sequences to Classify the Protostomes Mol. Biol. Evol., March 1, 2002; 19(3): 289 - 301. [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]
|
|
|
|
|
|
Y. Murakami, M. Ogasawara, F. Sugahara, S. Hirano, N. Satoh, and S. Kuratani Identification and expression of the lamprey Pax6 gene: evolutionary origin of the segmented brain of vertebrates Development, September 15, 2001; 128(18): 3521 - 3531. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. H. Neidert, V. Virupannavar, G. W. Hooker, and J. A. Langeland Lamprey Dlx genes and early vertebrate evolution PNAS, February 13, 2001; 98(4): 1665 - 1670. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. M. Shimeld and P. W. H. Holland Special Feature: Vertebrate innovations PNAS, April 25, 2000; 97(9): 4449 - 4452. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. Delarbre, H. Escriva, C. Gallut, V. Barriel, P. Kourilsky, P. Janvier, V. Laudet, and G. Gachelin The Complete Nucleotide Sequence of the Mitochondrial DNA of the Agnathan Lampetra fluviatilis: Bearings on the Phylogeny of Cyclostomes Mol. Biol. Evol., April 1, 2000; 17(4): 519 - 529. [Abstract] [Full Text] [PDF]
|
|