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Título

The Xenopus Irx genes are essential for neural patterning and define the border between prethalamus and thalamus through mutual antagonism with the anterior repressors Fezf and Arx

AutorRodríguez-Seguel, Elisa CSIC; Alarcón, Pilar CSIC; Gómez-Skarmeta, José Luis CSIC ORCID
Palabras claveIroquois
Fez
Arx
Neural develpment
Xenopus
Morpholio
Fecha de publicación4-mar-2009
EditorElsevier
CitaciónDevelopmental Biology - Kidlington 329(2): 258-268(2009)
ResumenThe Iroquois (Irx) genes encode homeoproteins conserved during evolution. Vertebrate genomes contain six Irx genes organized in two clusters, IrxA (which harbors Irx1, Irx2 and Irx4) and IrxB (which harbors Irx3, Irx5 and Irx6). To determine the precise role of these genes during development and their putative redundancies, we conducted a comparative expression analysis and a comprehensive loss-of-function study of all the early expressed Irx genes (Irx1–5) using specific morpholinos in Xenopus. We found that the five Irx genes display largely overlapping expression patterns and contribute to neural patterning. All Irx genes are required for proper formation of posterior forebrain, midbrain, hindbrain and, to a lesser an extent, spinal cord. Nevertheless, Irx1 and Irx3 seem to have a predominant role during regionalization of the neural plate. In addition, we find that the common anterior limit of Irx gene expression, which will correspond to the future border between the prethalamus and thalamus, is defined by mutual repression between Fezf and Irx proteins. This mutual repression is likely direct. Finally, we show that Arx, another anteriorly expressed repressor, also contribute to delineate the anterior border of Irx expression.
Descripción11 páginas, 8 figuras.
Versión del editorhttp://dx.doi.org/10.1016/j.ydbio.2009.02.028
URIhttp://hdl.handle.net/10261/40659
DOI10.1016/j.ydbio.2009.02.028
ISSN0012-1606
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