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Mech Dev 2010 Jan 01;1271-2:49-61. doi: 10.1016/j.mod.2009.11.001.
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XPteg (Xenopus proximal tubules-expressed gene) is essential for pronephric mesoderm specification and tubulogenesis.

Lee SJ , Kim S , Choi SC , Han JK .

Retinoic acid (RA) signaling is important for the early steps of nephrogenic cell fate specification. Here, we report a novel target gene of RA signaling named XPteg (Xenopus proximal tubules-expressed gene) which is critical for pronephric development. XPteg starts to be expressed at the earliest stage of embryonic kidney specification and was restricted to the pronephric proximal tubules during kidney development. Anti-sense morpholino (MO)-mediated knockdown of XPteg perturbed formation of pronephros as demonstrated by reduced expression of pronephric tubule markers. Conversely, overexpression of XPteg promoted endogenous and ectopic expression of those markers and expanded pronephric tubules. Treatment of retinoic acid induced the expression of XPteg in the pronephric field without protein synthesis. Furthermore, we found that the pronephric defects caused by a dominant negative RA receptor could be rescued by coexpression of XPteg. Taken together, these results suggest that XPteg functions as a direct transcriptional target of RA signaling to regulate pronephric tubulogenesis in Xenopus early development.

PubMed ID: 19909807
Article link: Mech Dev

Species referenced: Xenopus laevis
Genes referenced: gal.2 grem1 lhx1 myod1 nphs1 odc1 pax2 pax8 pdzk1 pdzk1ip1 rab40b rgn
Morpholinos: pdzk1ip1 MO1

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