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Common Transcriptional Mechanisms for Visual Photoreceptor Cell Differentiation among Pancrustaceans
Visual systems are populated by one of two fundamental types of photoreceptors, ciliary and rhabdomeric. Each photoreceptor type is defined by the opsin molecule expressed and the final morphological form adapted to house the phototransduction machinery. Here we address whether a common transcriptional mechanisms exists for the differentiation of rhabdomeric photoreceptors. We demonstrate that orthologs of two Drosophila (fruit fly) transcription factors, Pph13 and Orthodenticle, are expressed in photoreceptors of Pancrustaceans, Tribolium (red flour beetle) and Daphnia (water flea), and are capable of executing conserved functions of rhabdomeric photoreceptor differentiation. In particular, Tribolium and Daphnia orthologs are capable of substituting and rescuing the photoreceptor differentiation defects observed in their corresponding Drosophila mutants. Furthermore, loss of function analysis in Tribolium of both Pph13 and orthodenticle genes demonstrate they regulate opsin transcription and morphogenesis of the photoreceptor apical membrane. Our data illuminate a framework for rhabdomeric photoreceptor differentiation and provide the foundation for defining the ancestral regulatory modules for rhabdomeric differentiation and potential modifications that underlie the functional diversity observed in rhabdomeric photoreceptors.
Vyšlo v časopise: Common Transcriptional Mechanisms for Visual Photoreceptor Cell Differentiation among Pancrustaceans. PLoS Genet 10(7): e32767. doi:10.1371/journal.pgen.1004484
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.pgen.1004484Souhrn
Visual systems are populated by one of two fundamental types of photoreceptors, ciliary and rhabdomeric. Each photoreceptor type is defined by the opsin molecule expressed and the final morphological form adapted to house the phototransduction machinery. Here we address whether a common transcriptional mechanisms exists for the differentiation of rhabdomeric photoreceptors. We demonstrate that orthologs of two Drosophila (fruit fly) transcription factors, Pph13 and Orthodenticle, are expressed in photoreceptors of Pancrustaceans, Tribolium (red flour beetle) and Daphnia (water flea), and are capable of executing conserved functions of rhabdomeric photoreceptor differentiation. In particular, Tribolium and Daphnia orthologs are capable of substituting and rescuing the photoreceptor differentiation defects observed in their corresponding Drosophila mutants. Furthermore, loss of function analysis in Tribolium of both Pph13 and orthodenticle genes demonstrate they regulate opsin transcription and morphogenesis of the photoreceptor apical membrane. Our data illuminate a framework for rhabdomeric photoreceptor differentiation and provide the foundation for defining the ancestral regulatory modules for rhabdomeric differentiation and potential modifications that underlie the functional diversity observed in rhabdomeric photoreceptors.
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