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XB-ART-38630
J Physiol 2009 Feb 01;5873:521-9. doi: 10.1113/jphysiol.2008.161562.
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NKCC1 (SLC12a2) induces a secondary axis in Xenopus laevis embryos independently of its co-transporter function.

Walters ZS , Haworth KE , Latinkic BV .


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NKCC1 is a broadly expressed Na(+)-K(+)-Cl(-) co-transporter involved in regulation of ion flux across the cell membrane and in regulating cell volume. Whilst much is known about the co-transporter activity of NKCC1 and its regulation by protein kinases and phosphatases, little is known about the activities of NKCC1 that are co-transporter independent. In this report we show that over-expression of NKCC1 in embryos of Xenopus laevis induces secondary axes, independently of its co-transporter activity. In addition, over-expression of NKCC1 results in the formation of neural tissue in ectodermal explants. We also show that NKCC1 is expressed broadly but non-uniformly in embryos of Xenopus laevis and Xenopus tropicalis, with prominent expression in the notochord, nervous system and stomach. These results provide insights into an additional, previously unreported activity of NKCCl.

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Species referenced: Xenopus tropicalis Xenopus laevis
Genes referenced: slc12a2

References [+] :
Carnac, The homeobox gene Siamois is a target of the Wnt dorsalisation pathway and triggers organiser activity in the absence of mesoderm. 1996, Pubmed, Xenbase