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Organogenesis 2009 Oct 01;54:201-10. doi: 10.4161/org.5.4.9973.
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Normal levels of p27 are necessary for somite segmentation and determining pronephric organ size.

Naylor RW , Collins RJ , Philpott A , Jones EA .

The Xenopus laevis cyclin dependent kinase inhibitor p27(Xic1) has been shown to be involved in exit from the cell cycle and differentiation of cells into a quiescent state in the nervous system, muscle tissue, heart and retina. We show that p27(Xic1) is expressed in the developing kidney in the nephrostomal regions. Using overexpression and morpholino oligonucleotide (MO) knock-down approaches we show normal levels of p27(Xic1) regulate pronephros organ size by regulating cell cycle exit. Knock-down of p27(Xic1) expression using a MO prevented myogenesis, as previously reported; an effect that subsequently inhibits pronephrogenesis. Furthermore, we show that normal levels of p27(Xic1) are required for somite segmentation also through its cell cycle control function. Finally, we provide evidence to suggest correct paraxial mesoderm segmentation is not necessary for pronephric induction in the intermediate mesoderm. These results indicate novel developmental roles for p27(Xic1), and reveal its differentiation function is not universally utilised in all developing tissues.

PubMed ID: 20539739
PMC ID: PMC2878748
Article link: Organogenesis
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: bcl2l1 cdca5 cdkn1a cdknx elavl1 gal.2 myh4 myh6 myod1 nphs1 tbxt tcf21 Upk3b znrd2
Antibodies: Kidney Ab1 Kidney Ab2
Morpholinos: cdknx MO1 tcf21 MO2

Phenotypes: Xla Wt + cdkn1a (cip1) (Fig. 2C) [+]

Article Images: [+] show captions
References [+] :
Barnett, Neural induction and patterning by fibroblast growth factor, notochord and somite tissue in Xenopus. 1998, Pubmed, Xenbase