Welcome to | |
Laboratory of ORIGIN OF EUKARYOTE | |
BIODIVERSITY |
Faculty | |||
Hisayoshi Nozaki (Associate Professor) | |||
Research interests
Species taxonomy of eukaryotic algae based on morphology and
molecular phylogeny; Origin of male and female as revealed by the comparative
studies of the colonial Volvocales; Origin and
macro-taxonomy of eukaryotic plants.
We welcome everyone who loves“lower eukaryotes”and is much interested in evolutionary biology.
Objectives
We have two
research objectives using living cultured materials of eukaryotic algae and
protozoa. These cultures were basically established by ourselves based on the field-collected samples.
Thus, we welcome field survey and go to everywhere to get interesting
organisms.
One of our
objectives is to construct natural
taxonomic systems of species of eukaryotic algae and their relatives based
on comparative morphology and molecular phylogeny. We have
firstly construct a natural
taxonomic system of species of eukaryotic algae based on the morphological and
monophyletic species concept in the genus Chlorogonium (Nozaki et al. 1998, J. Phycol.). This taxonomic
methodology has been applied to various green microalgae and the charalean genus Nitella (Sakayama et al. 2005, J. Phycol.).
The other is to
resolve fundamental biological problems such as origin of male-female sexuality
and origin and macro-taxonomy of eukaryotic plants. Recently, we
have firstly demonstrated the evolutionary link between the dominant isogametic mating type (minus)
and the “male” by determining the male-specific gene “OTOKOGI” (PlestMID) in the anisogamous volvocalean Pleodorina
starrii (Nozaki et al.
2006, Curr. Biol.).
This breakthrough provides an opportunity to address any number of extremely
interesting questions regarding evolution of oogamy and the origins of male-female
dichotomy.
Based on the
genome sequence data of the primitive red alga Cyanidioschyzon (e. g. Nozaki et al. 2007,
BMC Biol.), we resolved the nonmonophyly
of the primary photosynthetic eukaryotes (Archaeplastida) and proposed a new
taxonomic concept of plants, Plantae
emend. Nozaki et al. (2003, J. Mol. Evol.) or
“Super”
Lab members
Postdoctoral
fellows: Hiroko KAWAI-TOYOOKA, Yuko MOGI
Graduate
students: Yi YANG, Kaoru KAWAFUNE, Ryo MATSUZAKI, Nanako
ISAKA, Rei MORI, Yoko ARAGAKI, Toshiyuki TAKAHASHI
Undergraduates: Rintato HIRAIDE
Guest Postdoctoral fellow: Masahiro SUZUKI (
Selected publications
Nozaki, H., Ohta, N., Morita, E. & Watanabe, M. M. 1998. Toward a
natural system of species in Chlorogonium (Volvocales,
Chlorophyta): a combined analysis of morphological and rbcL gene
sequence data J. Phycol. 34: 1024-1037.
Nozaki, H., Misawa, K., Kajita, T., Kato, M., Nohara, S. and
Watanabe, M. M. 2000. Origin and evolution of the colonial
Volvocales (Chlorophyceae) as inferred from multiple, chloroplast
gene sequences. Mol. Phylog. Evol. 17: 256-268.
Nozaki, H., Mori, T., Misumi, O., Matsunaga, S. and Kuroiwa, T.
2006. Males evolved from the dominant isogametic mating type. Curr.
Biol. 16: R1018-R1020.
Nozaki, H., Takano, H., Misumi, O., Terasawa, K., Matuzaki, M.,
Maruyama, S., Nishida, K., Yagisawa, F., Yoshida, Y., Fujiwara, T.,
Takio, S., Tamura, K., Chung, S.-J., Nakamura, S., Kuroiwa, H.,
Tanaka, K., Sato, N. and Kuroiwa, T. 2007. A 100%-complete sequence
reveals unusually simple genomic features in the hot spring red alga
Cyanidioschyzon merolae. BMC Biology 5: 28.
Nozaki, H., Iseki, M., Hasegawa, M., Misawa, K., Nakada, T., Sasaki,
N. and Watanabe, M. 2007. Phylogeny of primary photosynthetic
eukaryotes as deduced from slowly evolving nuclear genes. Mol.
Biol. Evol. 24: 1592-1595.
Ferris, P., Olson, B. J. S. C., De Hoff, P. L., Douglass, S., Casero
Diaz-Cano, D., Prochnik, S., Geng, S., Rai, R., Grimwood, J.,
Schmutz, J., Nishii, I., Hamaji, T., Nozaki, H., Pellegrini, M., and
Umen, J. G. 2010. Evolution of an expanded sex determining region in
Volvox. Science 328: 351-354.