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PMID: 17174108 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Molecular phylogenetics in Hydra, a classical model in evolutionary developmental biology.

Molecular phylogenetics and evolution ·Vol. 44 ·No. 1 ·2007-07-00 ·Pages 281-90

Hemmrich G, Anokhin B, Zacharias H, Bosch TC

Abstract

Among the earliest diverging animal phyla are the Cnidaria. Freshwater polyps of the genus Hydra (Cnidaria, Hydrozoa) have long been of general interest because different species of Hydra reveal fundamental principles that underlie development, differentiation, regeneration and also symbiosis. The phylogenetic relationships among the Hydra species most commonly used in current research are not resolved yet. Here we estimate the phylogenetic relations among eight scientifically important members of the genus Hydra with molecular data from two nuclear (18S rDNA, 28S rDNA) and two mitochondrial (16S rRNA, cytochrome oxidase subunit I (COI)) genes. The phylogenetic trees obtained by maximum parsimony (MP), maximum likelihood (ML) and Bayesian inference (BI) methods were generally compatible with present morphological classification patterns. However, the present analysis also bears on several long-standing questions about Hydra systematics and reveals some characteristics of the phylogenetic relationships of this genus that were unknown so far. It indicates that Hydra viridissima, the only species in Hydra, which contains symbiotic algae, might be considered as the sister group to all other species within this genus. Analyses of both nuclear and mitochondrial sequences support the view that Hydra oligactis and Hydra circumcincta are sisters to all other Hydra species. Unexpectedly, we also find that in contrast to its initial description, the strain used for making transgenic Hydra, Hydra vulgaris (strain AEP) is more closely related to Hydra carnea than to other species of Hydra.

MeSH Terms

Animals Bayes Theorem Cell Nucleus/genetics DNA, Mitochondrial/genetics Electron Transport Complex IV/genetics Hydra/classification,genetics,growth & development Likelihood Functions Microscopy, Interference Molecular Sequence Data Phylogeny RNA, Ribosomal, 16S/genetics RNA, Ribosomal, 18S/genetics RNA, Ribosomal, 28S/genetics Sequence Analysis, DNA Species Specificity

Chemicals

DNA, Mitochondrial RNA, Ribosomal, 16S RNA, Ribosomal, 18S RNA, Ribosomal, 28S Electron Transport Complex IV

Authors & Affiliations

4 authors, click to expand affiliations / ORCID

Hemmrich Georg

Zoological Institute, Christian Albrechts University, 24105 Kiel, Germany.

Anokhin Boris

Zacharias Helmut

Bosch Thomas C G

Article Info

Journal

Molecular phylogenetics and evolution

Abbr.

Mol Phylogenet Evol

ISSN

1055-7903

DOI

10.1016/j.ympev.2006.10.031

Published

2007-07-00

Epub

2006-00-07

Pages

281-90

Language

English

Region

United States

NLM ID

9304400

Subset

Databases

GENBANK

EF059926, EF059927, EF059928, EF059929, EF059930, EF059931, EF059932, EF059933, EF059934, EF059935, EF059936, EF059937, EF059938, EF059939, EF059940, EF059941, EF059942, EF059943, EF059944, EF059945, EF059946, EF059947, EF059948, EF059949, EF059950, EF059951, EF059952, EF059953, EF059954, EF059955, EF059956, EF059957

External Links

PubMed source DOI: 10.1016/j.ympev.2006.10.031 View journal details

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Molecular phylogenetics in Hydra, a classical model in evolutionary developmental biology.

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