2004 Fiscal Year Final Research Report Summary
Phylogenetic relationships and divergence times of reptiles inferred by mitochondrial DNA sequences
| Project/Area Number |
14540641
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
系統・分類
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| Research Institution | Nagoya University |
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Principal Investigator |
KUMAZAWA Yoshinori Nagoya University, Graduate School of Science, Assistant Professor, 大学院・理学研究科, 講師 (60221941)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIDA Mutsumi University of Tokyo, Ocean Research Institute, Professor, 海洋研究所, 教授 (90136896)
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| Project Period (FY) |
2002 – 2004
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| Keywords | lizards / snakes / mitochondrial DNA / molecular phylogeny / divergence time / gene organization / vicariance / biogeography |
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| Research Abstract |
During the granted period, we have sequenced mitochondrial DNAs of various reptiles. These data have been characterized in both the evolution of mitochondrial genome organization and the pattern and timing of phylogenetic divergences. We found that mtDNAs of some reptile groups (e.g., snakes, varanids, agamids, and cordylids) have distinct gene organizations from the typical organization found in most vertebrates. We then addressed when and how these gene rearrangements took place on ancestral lineages of each group by comparing sequences of the corresponding mtDNA region among relevant taxa. With respect to phylogenetic matters, the following implications were obtained. 1) Lacertilia can be divided into four groups mostly corresponding to infraorders suggested by morphological studies, 2) Amphisbaenia is nested within Lacertilia and is the most closely related to Lacertidae, 3) Among the four lizard infraorders, Gekkota rather than Iguania diverged first, 4) Snakes are not closely related to Varanoidea, and 5) Lizard families have deep divergences extending to Triassic and Jurassic.
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Research Products
(13 results)
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[Journal Article] Sister group relationship of turtles to the bird-crocodilian clade revealed by nuclear DNA-coded proteins.2005
Author(s)
Iwabe, N., Hara, Y., Kumazawa, Y., Shibamoto, K., Saito, Y., Miyata, T., Kato, K.
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Journal Title
Molecular Biology and Evolution 22
Pages: 810-813
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Sister group relationship of turtles to the bird-crocodilian Glade revealed by nuclear DNA-coded proteins.2005
Author(s)
Iwabe, N., Hara, Y., Kumazawa, Y., Shibamoto, K, Saito, Y, Miyata, T., Kato, K.
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Journal Title
Molecular Biology and Evolution 22(4)
Pages: 810-813
Description
「研究成果報告書概要(欧文)」より
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