title: miR Cluster 143/145 Directly Targets Nrl and Regulates Rod Photoreceptor Development.
abstract: Retinal histogenesis requires coordinated and temporal functioning of factors by which different cell types are generated from multipotent progenitors. Development of rod photoreceptors is regulated by multiple transcription factors, and Nrl is one of the major factors involved in their fate specification. Presence or absence of Nrl at the postnatal stages decides the generation of cone photoreceptors or other later retinal cells. This suggests the need for regulated expression of Nrl in order to accelerate the generation of other cell types during retinal development. We found that miR cluster 143/145, comprising miR-143 and miR-145, targets and imparts a posttranscriptional inhibition of Nrl. Expression of both miRNAs was differentially regulated during retinal development and showed least expression at PN1 stage in which most of the rod photoreceptors are generated. Downregulation of rod photoreceptor regulators and markers upon miR cluster 143/145 overexpression demonstrated that this cluster indeed negatively regulates rod photoreceptors. Further, we prove that Nrl positively regulates miR cluster 143/145, thus establishing a feedback loop regulatory mechanism. This may be one possible mechanism by which Nrl is posttranscriptionally regulated to facilitate the generation of other cell types in retina.
authors.affiliation: Molecular Neurobiology Laboratory, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, Kerala, India.
authors.forename: Sreekumaran
authors.initials: S
authors.lastname: Sreekanth
authors.affiliation: Neuro Stem Cell Biology Laboratory, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, Kerala, India.
authors.forename: Vazhanthodi A
authors.initials: VA
authors.lastname: Rasheed
authors.affiliation: Neuro Stem Cell Biology Laboratory, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, Kerala, India.
authors.forename: Lalitha
authors.initials: L
authors.lastname: Soundararajan
authors.affiliation: Cancer Research Program-2, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, Kerala, India.
authors.forename: Jayesh
authors.initials: J
authors.lastname: Antony
authors.affiliation: Cancer Research Program-2, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, Kerala, India.
authors.forename: Minakshi
authors.initials: M
authors.lastname: Saikia
authors.affiliation: Bioinformatic Facility, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, Kerala, India.
authors.forename: Krishnankutty Chandrika
authors.initials: KC
authors.lastname: Sivakumar
authors.affiliation: Molecular Neurobiology Laboratory, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, Kerala, India. anivdas@rgcb.res.in.|Cancer Research Program-9, Rajiv Gandhi Centre for Biotechnology, Thiruvananthapuram, 695014, Kerala, India. anivdas@rgcb.res.in.
authors.forename: Ani V
authors.initials: AV
authors.lastname: Das
mesh_terms: D000818:Animals; D050976:Basic-Leucine Zipper Transcription Factors / Q000235:genetics* / Q000378:metabolism; D002454:Cell Differentiation; D005136:Eye Proteins / Q000235:genetics*; D051379:Mice; D035683:MicroRNAs / Q000235:genetics*; D055495:Neurogenesis / Q000235:genetics*; D011401:Promoter Regions, Genetic / Q000235:genetics; D012160:Retina / Q000378:metabolism*; D017948:Retinal Rod Photoreceptor Cells / Q000378:metabolism*
chemical_list: D050976:Basic-Leucine Zipper Transcription Factors; D005136:Eye Proteins; C543499:MIRN145a microRNA, mouse; D035683:MicroRNAs; C532884:MIRN143 microRNA, mouse; C084884:Nrl protein, mouse
keywords: Nrl; Photoreceptors; Retina; miR cluster 143/145