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The zebrafish orphan nuclear receptor genes nr2e1 and nr2e3 are expressed in developing eye and forebrain
Södertörn University, School of Life Sciences. Karolinska Institutet.
Södertörn University, School of Life Sciences. Karolinska Institutet.
2007 (English)In: Gene Expression Patterns, ISSN 1567-133X, E-ISSN 1872-7298, Vol. 7, no 4, 521-528 p.Article in journal (Refereed) Published
Abstract [en]

Mammalian Nr2e1 (Tailless, Mtll or Tlx) and Nr2e3 (photoreceptor-specific nuclear receptor, Pnr) are highly related orphan nuclear receptors, that are expressed in eye and forebrain-derived structures. In this study, we analyzed the developmental expression patterns of zebrafish nr2e1 and nr2e3. RT-PCR analysis showed that nr2e1 and nr2e3 are both expressed during embryonic and post-embryonic development. To examine the spatial distribution of nr2e1 and nr2e3 during development whole-mount in situ hybridization was performed. At tailbud stage, initial nr2e1 expression was localized to the rostral brain rudiment anterior to pax2.1 and eng2 expression at the prospective midbrain-hindbrain boundary. During Subsequent stages, nr2e1 became widely expressed in fore- and midbrain primordia, eye and olfactory placodes. At 24 hpf, strong nr2e1 expression was detected in telencephalon, hypothalamus, dorsal thalamus, pretectum, midbrain tectum, and retina. At 2 dpf, the initially widespread nr2e1 expression became more restricted to distinct regions within the fore- and midbrain and to the retinal ciliary margin, the germinal zone which gives rise to retina and presumptive iris. Express on of nr2e3 was exclusively found in the developing retina and epiphysis. In both structures, nr2e3 expression was found in photoreceptor cells. The developmental expression profile of zebrafish nr2e1 and nr2e3 is consistent with evolutionary conserved functions in eye and rostral brain structures.

Place, publisher, year, edition, pages
2007. Vol. 7, no 4, 521-528 p.
National Category
Developmental Biology Genetics
URN: urn:nbn:se:sh:diva-14236DOI: 10.1016/j.modgep.2006.10.006ISI: 000244570400018PubMedID: 17127102ScopusID: 2-s2.0-33846590514OAI: diva2:467712
Available from: 2011-12-19 Created: 2011-12-19 Last updated: 2016-12-29Bibliographically approved
In thesis
1. Teleost retina: a model for study neurogenesis and angiogenesis
Open this publication in new window or tab >>Teleost retina: a model for study neurogenesis and angiogenesis
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Teleost models, zebrafish and medaka have become popular models to study various aspects of developmental biology and genetics. The rapid embryonic development, transparent embryos and the availability of many mutants for various developmental and molecular pathways contribute to the usefulness of these models. The availability of various biochemical, molecular and genetic techniques applicable on these models facilitate in dissecting developmental processes. Teleost retina shows very high similarity to that seen in mammalian retina. The arrangement of the six types of neurons and one type of glia is very similar. Zebrafish has been extensively used in gaining insight into the development and functioning of the retina. Medaka, on the other hand has not been so extensively capitalized as zebrafish. The current study characterizes expression of genes mainly from the nuclear receptor family and establishes the role of zebrafish liver x receptor in governing the size, patterning and neurogenesis of the retina in zebrafish. We also establish the time line of the retinal patterning of medaka retina. Zebrafish and medaka retina show both similarity and difference in the developmental events governing the patterning of the retina. In zebrafish, retinal neurogenesis follows a fan gradient pattern starting at the ventro-nasal region. In medaka, neurogenesis starts from the central retina. An additional, second domain of neurogenesis is seen with the patterning of photoreceptors in medaka. This observation highlights the possibility of utilizing these two species as comparative models in gaining rapid understanding of retinal development and function. This study also establishes the time line of vascular development in the zebrafish retina, an important event required for normal function. Similar to neurogenesis, vasculaturedevelops rapidly and this feature was utilized to develop a small molecule-screening assay. The screening resulted in identification of five compounds that produced phenotype ranging from decrease in the number of vessels to loss of vessels specifically in the retina. To gain insight into the mode of action, further analyses of three of the five identified compounds, using either morpholino knockdown or structural similarity search was done. This study highlights the advantage of using zebrafish model to perform medically relevant chemical screen.

Place, publisher, year, edition, pages
Stockholm: Karolinska instiutet, 2009. 37 p.
National Category
Biological Sciences
urn:nbn:se:sh:diva-31551 (URN)978-91-7409-365-0 (ISBN)
Public defence
2009-03-30, Månen, Alfred Nobels allé 8, Huddinge, 09:00
Available from: 2016-12-29 Created: 2016-12-29 Last updated: 2016-12-29Bibliographically approved

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