title: Common transcriptional mechanisms for visual photoreceptor cell differentiation among Pancrustaceans.
abstract: A hallmark of visual rhabdomeric photoreceptors is the expression of a rhabdomeric opsin and uniquely associated phototransduction molecules, which are incorporated into a specialized expanded apical membrane, the rhabdomere. Given the extensive utilization of rhabdomeric photoreceptors in the eyes of protostomes, here we address whether a common transcriptional mechanism exists for the differentiation of rhabdomeric photoreceptors. In Drosophila, the transcription factors Pph13 and Orthodenticle (Otd) direct both aspects of differentiation: rhabdomeric opsin transcription and rhabdomere morphogenesis. We demonstrate that the orthologs of both proteins are expressed in the visual systems of the distantly related arthropod species Tribolium castaneum and Daphnia magna and that their functional roles are similar in these species. In particular, we establish that the Pph13 homologs have the ability to bind a subset of Rhodopsin core sequence I sites and that these sites are present in key phototransduction genes of both Tribolium and Daphnia. Furthermore, Pph13 and Otd orthologs are capable of executing deeply conserved functions of photoreceptor differentiation as evidenced by the ability to rescue their respective Drosophila mutant phenotypes. Pph13 homologs are equivalent in their ability to direct both rhabdomere morphogenesis and opsin expression within Drosophila, whereas Otd paralogs demonstrate differential abilities to regulate photoreceptor differentiation. Finally, loss-of-function analyses in Tribolium confirm the conserved requirement of Pph13 and Otd in regulating both rhabdomeric opsin transcription and rhabdomere morphogenesis. Taken together, our data identify components of a regulatory framework for rhabdomeric photoreceptor differentiation in Pancrustaceans, providing a foundation for defining ancestral regulatory modules of rhabdomeric photoreceptor differentiation.
authors.affiliation: Department of Biology, Indiana University, Bloomington, Indiana, United States of America.
authors.forename: Simpla
authors.initials: S
authors.lastname: Mahato
authors.affiliation: School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan.
authors.forename: Shinichi
authors.initials: S
authors.lastname: Morita
authors.affiliation: Department of Biology, Southern Arkansas University, Magnolia, Arkansas, United States of America.
authors.forename: Abraham E
authors.initials: AE
authors.lastname: Tucker
authors.affiliation: Department of Biology, Indiana University, Bloomington, Indiana, United States of America.
authors.forename: Xulong
authors.initials: X
authors.lastname: Liang
authors.affiliation: Department of Biological Sciences, Wayne State University, Detroit, Michigan, United States of America.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Jackowska
authors.affiliation: Department of Biological Sciences, Wayne State University, Detroit, Michigan, United States of America; Department of Anatomy and Cell Biology, Wayne State University, School of Medicine, Detroit, Michigan, United States of America.
authors.forename: Markus
authors.initials: M
authors.lastname: Friedrich
authors.affiliation: School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Shiga
authors.affiliation: Department of Biology, Indiana University, Bloomington, Indiana, United States of America.
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Zelhof
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000235:genetics*; D003621:Daphnia / Q000235:genetics / Q000378:metabolism; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism; D004331:Drosophila melanogaster / Q000254:growth & development / Q000378:metabolism; D018398:Homeodomain Proteins / Q000235:genetics / Q000378:metabolism; D055495:Neurogenesis / Q000235:genetics*; D017956:Photoreceptor Cells, Invertebrate / Q000378:metabolism*; D012243:Rhodopsin / Q000235:genetics; D014158:Transcription, Genetic; D014231:Tribolium / Q000235:genetics / Q000378:metabolism
chemical_list: D029721:Drosophila Proteins; D018398:Homeodomain Proteins; C411858:Pph13 protein, Drosophila; C093053:oc protein, Drosophila; D012243:Rhodopsin