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Science 28 January 2005:
Vol. 307. no. 5709, p. 545
DOI: 10.1126/science.1106305
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Brevia

Marine Fish Egg Hydration Is Aquaporin-Mediated

Mercedes Fabra,1 Demetrio Raldúa,1 Deborah M. Power,2 Peter M. T. Deen,3 Joan Cerdà1*

The positive buoyancy of marine fish eggs in sea water, allowed by hydration of the oocyte, is critical for their survival and dispersion in the ocean. We isolated an aquaporin, SaAQP1o, that belongs to a unique subfamily of aquaporin-1—like channels specifically evolved in teleosts and mainly expressed in the ovary. We further show that hormone-induced fish oocyte hydration is a highly controlled process based on the interplay between protein hydrolysis and the translocation of SaAQP1o to the plasma membrane, indicating a specialized physiological role for this aquaporin.

1 Center of Aquaculture–Institut de Recerca i Tecnologia Agroalimentaries, Tarragona, Spain, and Reference Center in Aquaculture, Barcelona, Spain.
2 Center of Marine Sciences, Universidade do Algarve, Faro, Portugal.
3 Department of Physiology, Radboud University of Nijmegen Medical Center, Nijmegen, Netherlands.

* To whom correspondence should be addressed. E-mail: jcerda{at}icm.csic.es

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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