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PLoS Genet 2014 Jan 01;101:e1004080. doi: 10.1371/journal.pgen.1004080.
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Bioelectric signaling regulates size in zebrafish fins.

Perathoner S , Daane JM , Henrion U , Seebohm G , Higdon CW , Johnson SL , Nüsslein-Volhard C , Harris MP .

The scaling relationship between the size of an appendage or organ and that of the body as a whole is tightly regulated during animal development. If a structure grows at a different rate than the rest of the body, this process is termed allometric growth. The zebrafish another longfin (alf) mutant shows allometric growth resulting in proportionally enlarged fins and barbels. We took advantage of this mutant to study the regulation of size in vertebrates. Here, we show that alf mutants carry gain-of-function mutations in kcnk5b, a gene encoding a two-pore domain potassium (K(+)) channel. Electrophysiological analysis in Xenopus oocytes reveals that these mutations cause an increase in K(+) conductance of the channel and lead to hyperpolarization of the cell. Further, somatic transgenesis experiments indicate that kcnk5b acts locally within the mesenchyme of fins and barbels to specify appendage size. Finally, we show that the channel requires the ability to conduct K(+) ions to increase the size of these structures. Our results provide evidence for a role of bioelectric signaling through K(+) channels in the regulation of allometric scaling and coordination of growth in the zebrafish.

PubMed ID: 24453984
PMC ID: PMC3894163
Article link: PLoS Genet
Grant support: [+]

Species referenced: Xenopus
Genes referenced: gtf2a1l kcnk4 kcnk5 nudt6 pcna tnni1

Article Images: [+] show captions
References [+] :
Adams, Light-activation of the Archaerhodopsin H(+)-pump reverses age-dependent loss of vertebrate regeneration: sparking system-level controls in vivo. 2013, Pubmed, Xenbase