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Evolutionary study of endosymbiosis  between Hydra and Chlorella by   comparative genomic analysisIshikawa MasakazuDDA sem...
Endosymbiosis
Why certain species can live        endosymbiotically?Differences between symbiotic and non-           symbiotic species
Hydra viridissima and Chlorella spp.                           • Symbiosis with                             Clorella      ...
http://www.sci.keio.ac.jp/gp/FE14F344/67A6D78B/9BDD64A5.pdf
Phylogenetic tree of Hydra                                  H. vulgaris group                                  H. oligacti...
Phylogenetic tree of ChlorellaSymbiotic ability with H. viridissima   C. sorokinianaRed: YesBlack: No                     ...
Kawaida et al., 2010
Kawaida et al., 2010
Comparative genomics              SNPs IndelsChlorella sp. CGCAAATCGAAGGGC. vulgaris CGCATATC - - - GGG
Comparative transcriptomics                        Chlorella sp.           C. vulgaris Expression level       free-living ...
Knockdown by using RNAi method   siRNA   mRNA                  Expression of gene A is suppressed                       Ex...
Re-infection      WT             RNAi strainAposymbiotic Hydra
•How different between symbiotic andnon-symbiotic states.•How does Hydra regulate proliferationof Chlorella sp.
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  1. 1. Evolutionary study of endosymbiosis between Hydra and Chlorella by comparative genomic analysisIshikawa MasakazuDDA seminar 21, Feb. 2013
  2. 2. Endosymbiosis
  3. 3. Why certain species can live endosymbiotically?Differences between symbiotic and non- symbiotic species
  4. 4. Hydra viridissima and Chlorella spp. • Symbiosis with Clorella • Both can live independently • Easy to culture • non-symbiotic species in same genus are known Kawaida et al.
  5. 5. http://www.sci.keio.ac.jp/gp/FE14F344/67A6D78B/9BDD64A5.pdf
  6. 6. Phylogenetic tree of Hydra H. vulgaris group H. oligactis group H. braueri group H. viridissima groupSymbiotic ability with ClorellaRed: YesBlack: No Kawaida et al., 2010
  7. 7. Phylogenetic tree of ChlorellaSymbiotic ability with H. viridissima C. sorokinianaRed: YesBlack: No C. vulgaris sp. K10 sp. J8 sp. M8 C. lobophora
  8. 8. Kawaida et al., 2010
  9. 9. Kawaida et al., 2010
  10. 10. Comparative genomics SNPs IndelsChlorella sp. CGCAAATCGAAGGGC. vulgaris CGCATATC - - - GGG
  11. 11. Comparative transcriptomics Chlorella sp. C. vulgaris Expression level free-living free-living A B C D E A B C D E Genes Genes Chlorella sp. symbioticExpression level
  12. 12. Knockdown by using RNAi method siRNA mRNA Expression of gene A is suppressed Expression level A B C D E Genes
  13. 13. Re-infection WT RNAi strainAposymbiotic Hydra
  14. 14. •How different between symbiotic andnon-symbiotic states.•How does Hydra regulate proliferationof Chlorella sp.

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