Abstract
A carp caudal cDNA of 1.3 kb was cloned after screening an early segmentation stage cDNA library with a probe produced by PCR using conserved homeobox sequences as primers and genomic DNA as template. The homeobox gene was called carp-cdxl. The gene appears highly similar to other vertebrate caudal homologs, especially the zebrafish gene cdx(Zf-cad). The possible relationship to homeobox genes within the Hox-C gene complexes is discussed. A weak expression of the gene, detected by in situ hybridization, was found shortly before gastrulation (at 25% epiboly) in cells likely to have a posterior fate. During gastrulation expression became stronger. At the early segmentation stage, cells of the neural keel in the area of the prospective spinal cord expressed the gene. During the progression of segmentation, expression retracted in a caudal direction. The tailbud expressed the gene throughout, but the somites lost expression shortly after their formation. Only the most lateral mesoderm cells maintained expression in the trunk area. Carp-cdxl was also expressed in the endoderm. At 24 h after fertilization the gene was only expressed in the tailbud. At 48 h, no expression could be detected. The expression pattern suggests a function for carp-cdxl in gastrulation and patterning along the anterior-posterior axis of the embryo.
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Stroband, H.W.J., Stevens, C., te Kronnie, G. et al. Expression of carp-cdx1, a caudal homolog, in embryos of the carp, Cyprinus carpio . Roux's Arch Dev Biol 204, 369–377 (1995). https://doi.org/10.1007/BF00360482
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DOI: https://doi.org/10.1007/BF00360482