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Pubmed ID :18472403
Publication Date : //

A functional screen for genes involved in Xenopus pronephros development.


In Xenopus, the pronephros is the functional larval kidney and consists of two identifiable components; the glomus, the pronephric tubules, which can be divided into four separate segments, based on marker gene expression. The simplicity of this organ, coupled with the fact that it displays the same basic organization and function as more complex mesonephros and metanephros, makes this an attractive model to study vertebrate kidney formation. In this study, we have performed a functional screen specifically to identify genes involved in pronephros development in Xenopus. Gain-of-function screens are performed by injecting mRNA pools made from a non-redundant X. tropicalis full-length plasmid cDNA library into X. laevis eggs, followed by sib-selection to identify the single clone that caused abnormal phenotypes in the pronephros. Out of 768 egg and gastrula stage cDNA clones, 31 genes, approximately 4% of the screened clones, affected pronephric marker expression examined by whole mount in situ hybridization or antibody staining. Most of the positive clones had clear expression patterns in pronephros and predicted/established functions highly likely to be involved in developmental processes. In order to carry out a more detailed study, we selected Sox7, Cpeb3, P53csv, Mecr and Dnajc15, which had highly specific expression patterns in the pronephric region. The over-expression of these five selected clones indicated that they caused pronephric abnormalities with different temporal and spatial effects. These results suggest that our strategy to identify novel genes involved in pronephros development was highly successful, and that this strategy is effective for the identification of novel genes involved in late developmental events.

Authors : Kyuno Jun-ichi , Massé Karine , Jones Elizabeth A ,

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