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Tachibana Lab
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A lab that raises jellyfish to study the mechanisms of spawning, sleep, and lifespan.
AboutAbout the lab
Become a curious naturalist.
The Tachibana Lab uses Cladonema, a small jellyfish, to study the basic mechanisms of animals.
Its subjects include light-controlled spawning, the rhythm of egg production, sleep, lifespan, self/non-self recognition, and sex determination.
Day to day, the work is basically raising jellyfish, and on top of that the lab analyzes gene sequences and observes tissues under a microscope.
Lab members also build their own programs for analyzing behavior recordings, using small computers and Python.
Key terms
- Cnidarian
- A group of animals that includes jellyfish, corals, and sea anemones. They have stinging cells and relatively simple body structures
- Circadian rhythm
- A rhythm in living things in which bodily functions change on a cycle of about one day
- Diffuse nerve net
- A nervous system with no center like a brain, in which neurons spread through the whole body like a net
ResearchResearch themes
Using Cladonema as its main model, the lab investigates spawning, egg formation, sleep, lifespan, self/non-self recognition, and sex determination, from the level of the whole organism down to the genome, genes, and cells. Each student has an independent theme, and many are carried out as collaborations with labs inside and outside the university.
*Illustrative imageClock genes in jellyfish
The lab analyzes the genes of Cladonema's internal clock. During the breeding season, the jellyfish is thought to make new eggs from stem cells every day, and circadian rhythms are expected to be involved in regulating that cell division.
*Illustrative imageThe origin and evolution of nerves
Among multicellular animals, jellyfish acquired a nervous system at the earliest stage. Using Cladonema, which has a unique structure called a diffuse nerve net, the lab explores, in collaboration with labs within the university, where the mechanism for transmitting neural signals began and how it evolved.
*Illustrative imageSex determination
How sex is determined in Cladonema is still unknown. Because the animal may be able to change sex, the lab analyzes the mechanism in collaboration with labs within the university and the National Museum of Nature and Science.
*Illustrative imageFrom egg formation to spawning
The lab follows the process from the stem cells that give rise to oocytes, through the oocytes' growth and maturation, to their release into the sea. Light stimulation is involved in spawning, and understanding the mechanism is expected to help solve the mystery of mass spawning in corals, which are also cnidarians.
MembersFaculty
The Tachibana Lab consists of faculty members and PhD, master's, and undergraduate students.
- Associate ProfessorTachibana KazunoriPublications ↗
- Assistant ProfessorEiichi OkumuraPublications ↗
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Aglantha digitale medusa” Belostomatid / CC BY 4.0 (cropped)
- Clock genes in jellyfish: “Cladonema pacificum Mariho” Totti / CC BY-SA 4.0 (cropped)
- The origin and evolution of nerves: “Cnidarian” Andrew Bogott / CC BY-SA 3.0 (cropped)
- Sex determination: “Clytia hemisphaerica polyp colony” Tsuyoshi Momose / CC BY-SA 4.0 (cropped)
- From egg formation to spawning: “Coral Spawning ( )” National Marine Sanctuaries / Public domain (cropped)
- Related lab (Nobuhiro Nakamura Lab): “Multicolor fluorescence image of a living PC-12 cell” 8x57is / CC BY-SA 4.0 (cropped)
- Related lab (Kato Lab): “Takifugu poecilonotus by DaijuAzuma” Daiju Azuma / CC BY-SA 4.0 (cropped)
- Related lab (Kitao Lab): “Vmd screenshot” Hwttdz / CC BY-SA 3.0 (cropped)
- Related lab (Masuda Lab): “Cyanobacteria guerrero negro” NASA / Public domain (cropped)
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