Ecological Developmental Adaptability Life Sciences :
Ecological Dynamics


Assistant Professor Shinichiro Maruyama
Campus Aobayama campus
Laboratory Evolutionary Biology
Tel +81-22-795-6689
E-mail smaruyama@m.tohoku.ac.jp

My research interests centers on how endosymbiosis has emerged and shaped the evolutionary paths of ecosystems.


Academic degrees: M.Sc. in Biological Sciences, University of Tokyo; Ph.D. in Agricultural and Life Sciences, University of Tokyo, Tokyo, Japan.
Academic positions: JSPS Research Fellow (University of Tokyo), JSPS Postdoctoral Fellow for Research Abroad (Dalhousie University, Canada), Research fellow at National Institute of Basic Biology, etc.

Selected Publications
  1. Maruyama S, Shoguchi E, Satoh N, Minagawa J. Diversification of the light-harvesting complex gene family via intra- and intergenic duplications in the coral symbiotic alga Symbiodinium. PLoS ONE (2015) 10(3): e0119406.
  2. Kim E, Maruyama S. A contemplation on the secondary origin of green algal and plant plastids. Acta Soc Bot Pol (2014) 83(4):331–336.
  3. Maruyama S, Tokutsu R, Minagawa J. Transcriptional regulation of the stress-responsive light harvesting complex genes in Chlamydomonas reinhardtii. Plant Cell Physiol (2014) 55:1304-10.
  4. Burki F, Imanian B, Hehenberger E, Hirakawa Y, Maruyama S, Keeling PJ. Endosymbiotic gene transfer in tertiary plastid-containing dinoflagellates. Eukaryot Cell (2014) 13:246–55.
  5. Maruyama S, Kim E. A modern descendent of early green algal phagotrophs. Curr Biol (2013) 23:1081-4.
  6. Maruyama S, Eveleigh RJM. Archibald JM. Treetrimmer: a method for phylogenetic data reduction. BMC Res Notes (2013) 6:145.
  7. Maruyama S, Archibald JM. Endosymbiosis, gene transfer and algal cell evolution. Advances in Algal Cell Biology (ed. Heimann K & Katsaros C) (2012) 21-42.
  8. Curtis BA, Tanifuji G, Burki F, Gruber A, Irimia M, Maruyama S, et al. (+70 authors). Algal genomes reveal evolutionary mosaicism and the fate of nucleomorphs. Nature (2012) 492:59-65.
  9. Nozaki H, Yang Y, Maruyama S, Suzaki T. A Case Study for Effects of Operational Taxonomic Units from Intracellular Endoparasites and Ciliates on the Eukaryotic Phylogeny: Phylogenetic Position of the Haptophyta in Analyses of Multiple Slowly Evolving Genes. PLoS ONE (2012) 7: e50827.
  10. Yang Y, Maruyama S, Sekimoto H, Sakayama H, Nozaki H. An extended phylogenetic analysis reveals ancient origin of "non-green" phosphoribulokinase genes from two lineages of "green" secondary photosynthetic eukaryotes: Euglenophyta and Chlorarachniophyta. BMC Res Notes (2011) 4: 330.
  11. Maruyama S, Suzaki T, Weber AP, Archibald JM, Nozaki H. Eukaryote-to-eukaryote gene transfer gives rise to genome mosaicism in euglenids. BMC Evol Biol (2011) 11:105.
  12. Yoshida S, Maruyama S, Nozaki H, Shirasu K. Nuclear horizontal gene transfer by the parasitic plant Striga hermonthica. Science (2010) 328:1128.
  13. Imamura S, Terashita M, Ohnuma M, Maruyama S, Minoda A, Weber AP, Inouye T, Sekine Y, Fujita Y, Omata T, Tanaka K. Nitrate Assimilatory Genes and Their Transcriptional Regulation in a Unicellular Red Alga Cyanidioschyzon merolae: Genetic Evidence for Nitrite Reduction by a Sulfite Reductase-like Enzyme. Plant Cell Physiol (2010) 51:707-17.
  14. Imoto Y, Fujiwara T, Yoshida Y, Kuroiwa H, Maruyama S, Kuroiwa T. Division of cell nuclei, mitochondria, plastids, and microbodies mediated by mitotic spindle poles in the primitive red alga Cyanidioschyzon merolae. Protoplasma (2010) 241:63-74.
  15. Maruyama S, Sugahara J, Kanai A, Nozaki H. Permuted tRNA genes in the nuclear and nucleomorph genomes of photosynthetic eukaryotes. Mol Biol Evol (2010) 27:1070-6.
Activities in Academic Societies

Botanical Society of Japan

Recent Activities

Endosymbiosis is a process where an organism is incorporated into and lives inside the cell of another organism. This has given rise to a wealth of ecological diversity on this planet. Mitochondria in all the eukaryotes including humans, and chloroplasts in land plants and algae, are also acquired via this type of revolutionizing, and relatively rare, amalgamation of different organisms.

The endosymbiosis is not only an 'ancient' evolutionary event, but still ongoing biological process. Reef building coral is one of the examples: some other cnidarian animals including corals, sea anemone and jellyfish, harbor endosymbiotic dinoflagellate algae called 'zooxanthellae' inside the endodermal cells. The coral hosts give shelters and nutrients to endosymbiotic algae, and the algae provide sugars generated via photosynthesis in return. This relationship, however, is vulnerable to environmental changes and now in danger of breakdown.

My research aim is to study genes and cellular functions involved in the 'birth and death' of the endosymbiosis, and to understand how this type of endosymbiotic relationship has evolved and contributed to the diversification of ecosystems on the earth.