Cell Tissue Res 1999 Aug 01;2972:283-90. doi: 10.1007/s004410051356.

Expression of axolotl RNA-binding protein during development of the Mexican axolotl.

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Amphibians occupy a central position in phylogeny between aquatic and terrestrial vertebrates and are widely used as model systems for studying vertebrate development. We have undertaken a comprehensive molecular approach to understand the early events related to embryonic development in the Mexican axolotl, Ambystoma mexicanum, which is an exquisite animal model for such explorations. Axolotl RBP is a RNA-binding protein which was isolated from the embryonic Mexican axolotl by subtraction hybridization and was found to show highest similarity with human, mouse, and Xenopus cold-inducible RNA-binding protein (CIRP). The reverse transcriptase polymerase chain reaction (RT-PCR) analysis suggests that it is expressed in most of the axolotl tissues except liver; the expression level appears to be highest in adult brain. We have also determined the temporal and spatial pattern of its expression at various stages of development. RT-PCR and in situ hybridization analyses indicate that expression of the AxRBP gene starts at stage 10-12 (gastrula), reaches a maxima around stage 15-20 (early tailbud), and then gradually declines through stage 40 (hatching). In situ hybridization suggests that the expression is at a maximum in neural plate and neural fold at stage 15 (neurula) of embryonic development.

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