Publications by authors named "Ryo Miyokawa"
The symbiotic hydra has a stable symbiotic relationship with the green alga . This hydra appears to cospeciate with the symbiotic alga, and some strains are known to have strain-specific host/symbiont combinations. To investigate the mechanism of the specificity between host and symbiont, we explored the effect of the removal or exchange of symbionts in two distantly related strains (K10 and M9).
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- Some strains of brown hydra can host the green algae Chlorococcum as symbionts, but most symbionts introduced artificially are unstable, making these relationships rare in nature.
- A study compared gene expression in newly established (strain 105G) and native (strain J7) symbiotic hydra, revealing both strains had similar expression changes, including increased lysosomal enzyme activity and decreased nematocyte-related genes.
- The research also found that only strain 105G showed increased gene activity for translation and respiration, and inhibition of translation with rapamycin led to significant degeneration of symbiotic strains, highlighting the importance of cellular metabolic balance for successful endosymbiosis.
Some hydra strains belonging to the vulgaris group show a symbiotic relationship with green algae Chlorococcum sp. The symbiotic green algae can escape from the host polyps and can form swimming zoospores (which have two flagella) in culture solution. We observed that co-culture with the symbiotic polyps caused horizontal transmission of the symbionts into some non-symbiotic hydra strains that have no symbionts in nature and that belong not only to the vulgaris group but also to other hydra species groups.
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