Complete Mitochondrial DNA of the Hagfish, Eptatretus burgeri: The Comparative Analysis of Mitochondrial DNA Sequences Strongly Supports the Cyclostome Monophyly

Delarbre, Christiane; Gallut, Cyril; Barriel, Véronique; Janvier, Philippe; Gachelin, Gabriel

doi:10.1006/mpev.2001.1045

Cited by 104 publications

(71 citation statements)

References 39 publications

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“…Molecular phylogenies tend to support the monophyletic status of a hagfish/lamprey clade (Forey & Janvier, 1993;Delabre et al, 2002;Furlong & Holland, 2002;Takezaki et al, 2003), however. Either phylogenetic hypothesis together with the Quartet Mapping data and the previously published results for lamprey (Fried et al, 2003) have two implications.…”

Section: Treementioning

confidence: 94%

Evidence for independent Hox gene duplications in the hagfish lineage: a PCR-based gene inventory of Eptatretus stoutii

Stadler

Fried

Prohaska

et al. 2004

Molecular Phylogenetics and Evolution

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Hox genes code for transcription factors that play a major role in the development of all animal phyla. In invertebrates these genes usually occur as tightly linked cluster, with a few exceptions where the clusters have been dissolved. Only in vertebrates multiple clusters have been demonstrated which arose by duplication from a single ancestral cluster. This history of Hox cluster duplications, in particular during the early elaboration of the vertebrate body plan, is still poorly understood. In this paper we report the results of a PCR survey on genomic DNA of the pacific hagfish Eptatretus stoutii. Hagfishes are one of two clades of recent jawless fishes that are an offshoot of the early radiation of jawless vertebrates. Our data provides evidence for at least 33 distinct Hox genes in the hagfish genome, which is most compatible Manuscript 24 October 2003with the hypothesis of multiple Hox clusters. The largest number, seven, of distinct homeobox fragments could be assigned to paralog group 9, which could imply that the hagfish has more than four clusters. Quartet mapping reveals that within each paralog group the hagfish sequences are statistically more closely related to gnathostome Hox genes than with either amphioxus or lamprey genes. These results support two assumptions about the history of Hox genes: (1) The association of hagfish homeobox sequences with gnathostome sequences suggests that at least one Hox cluster duplication event happened in the stem of vertebrates, i.e., prior to the most recent common ancestor of jawed and jawless vertebrates. (2) The high number of paralog group 9 sequences in hagfish and the phylogenetic position of hagfish suggests that the hagfish lineage underwent additional independent Hox cluster/-gene duplication events.

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Section: Treementioning

confidence: 94%

Evidence for independent Hox gene duplications in the hagfish lineage: a PCR-based gene inventory of Eptatretus stoutii

Stadler

Fried

Prohaska

et al. 2004

Molecular Phylogenetics and Evolution

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“…After a long-standing controversy on the phylogenetic positions of hagfishes and lampreys, the monophyly of cyclostomes has been unequivocally supported by molecular phylogenetics using a triad of molecules frequently used for reconstruction of species phylogeny, namely, mitochondrial genes (mtDNA), nuclear ribosomal RNA genes (rDNA), and nuclear protein-coding genes (nuDNA) ( Fig. 1; Stock and Whitt, 1992;Mallatt and Sullivan, 1998;Kuraku et al, 1999;Delarbre et al, 2002;Furlong and Holland, 2002;Takezaki et al, 2003;Blair and Hedges, 2005;Delsuc et al, 2006). Therefore, our interest in cyclostome evolution has shifted to the topological and temporal aspects of divergence patterns within this animal group.…”

Section: Introductionmentioning

confidence: 99%

Phylogeny of Living Parasitic Lampreys (Petromyzontiformes) Based on Morphological Data

Gill¹,

Renaud²,

Chapleau³

et al. 2003

Copeia

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“…This phylogenetic pattern implied that cyclostomes could throw light on the early steps of the assembly of the vertebrate body plan and that hagfishes could document the most generalized condition for a number of vertebrate characters (6). However, it soon raised heated debates, because an increasingly large number of molecular sequence data provided increasingly strong support for the old theory of cyclostomes monophyly (7,8); that is, hagfishes and lampreys were actually sister groups that had diverged in the early Paleozoic, up to 500 million years (Myr) ago. Morphologists who defended cylostome paraphyly argued that molecular sequence-based trees were inconclusive because of the uncertainty as to the outgroups of the vertebrates (i.e., their closest relatives and either tunicates of amphioxus) (Fig.…”

mentioning

confidence: 99%

microRNAs revive old views about jawless vertebrate divergence and evolution

Janvier

2010

Proc. Natl. Acad. Sci. U.S.A.

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Complete Mitochondrial DNA of the Hagfish, Eptatretus burgeri: The Comparative Analysis of Mitochondrial DNA Sequences Strongly Supports the Cyclostome Monophyly

Cited by 104 publications

References 39 publications

Evidence for independent Hox gene duplications in the hagfish lineage: a PCR-based gene inventory of Eptatretus stoutii

Evidence for independent Hox gene duplications in the hagfish lineage: a PCR-based gene inventory of Eptatretus stoutii

Phylogeny of Living Parasitic Lampreys (Petromyzontiformes) Based on Morphological Data

microRNAs revive old views about jawless vertebrate divergence and evolution

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