PubMed · 5816445
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S Busson-Mabillot. [Recent data on vitellogenesis].. https://pubmed.ncbi.nlm.nih.gov/5816445/
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A study of the sequences of the rhodopsin-encoding genes (Rh) in eight fish species from two of the major subdivisions of the teleosts reveals that no introns are present in the coding region. This contrasts with the opsin-encoding genes of all other vertebrates where either four or five introns are invariably found. Phylogenetic analysis shows that this intronless teleost Rh is homologous to the intron-containing Rh of amphibia, birds and mammals. Possible mechanisms for intron loss are discussed, including replacement by homologous conversion of Rh with a processed cDNA.
Limb regeneration is a phenomenon occurring only in some urodeles. The process seems to be initiated by the dedifferentiation of the terminally differentiated cells. These cells differentiate, subsequently, to the tissues that comprise the limb, thus reconstructing the pattern of the missing limb part. In this paper we review and present evidence that certain cell types of the limb have the capacity to differentiate to different cell types than their original one by cellular metaplasia. This switch is called transdifferentiation. The focus of this review is the process of dedifferentiation which is the necessary prerequisite for differentiation, and the possible mechanisms involved.
The neural retina of amphibians and chick embryos regenerates following damage. Retinal regeneration requires a change in the differentiated state of the cells of the pigmented epithelium of the retina to a neural progenitor phenotype. The molecular mechanisms that control the cell fate decision between these two very different cell types involves soluble growth factors of the fibroblast growth factor family, as well as components of the extracellular matrix. Recent experiments have also begun to detail differences in gene expression between the neural retina and the pigment epithelium that may be critical for their phenotypic distinction.