Right-elevated expression of charon is regulated by fluid flow in medaka Kupffer's vesicle

Motoki Hojo, Shigeo Takashima, Daisuke Kobayashi, Akira Sumeragi, Atsuko Shimada, Tatsuya Tsukahara, Hayato Yokoi, Takanori Narita, Tomoko Jindo, Takahiro Kage, Tadao Kitagawa, Tetsuaki Kimura, Koshin Sekimizu, Akimitsu Miyake, Davin Setiamarga, Ryohei Murakami, Sachiko Tsuda, Shinya Ooki, Ken Kakihara, Kiyoshi NaruseHiroyuki Takeda

Research output: Contribution to journalArticlepeer-review

58 Citations (Scopus)


Recent studies have revealed that a cilium-generated liquid flow in the node has a crucial role in the establishment of the left-right (LR) axis in the mouse. In fish, Kupffer's vesicle (KV), a teleost-specific spherical organ attached to the tail region, is known to have an equivalent role to the mouse node during LR axis formation. However, at present, there has been no report of an asymmetric gene expressed in KV under the control of fluid flow. Here we report the earliest asymmetric gene in teleost KV, medaka charon, and its regulation. Charon is a member of the Cerberus/DAN family of proteins, first identified in zebrafish. Although zebrafish charon was reported to be symmetrically expressed in KV, medaka charon displays asymmetric expression with more intense expression on the right side. This asymmetric expression was found to be regulated by KV flow because symmetric and up-regulated charon expression was observed in flow-defective embryos with immotile cilia or disrupted KV. Taken together, medaka charon is a reliable gene marker for LR asymmetry in KV and thus, will be useful for the analysis of the early steps downstream of the fluid flow.

Original languageEnglish
Pages (from-to)395-405
Number of pages11
JournalDevelopment Growth and Differentiation
Issue number5
Publication statusPublished - 2007 Jun


  • Cerberus/DAN
  • Left-right axis
  • Mutant
  • Nodal
  • Nodal flow


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