In vivo function of the orphan nuclear receptor NR2E3 in establishing photoreceptor identity during mammalian retinal development.

Abstract:

:Rod and cone photoreceptors in mammalian retina are generated from common pool(s) of neuroepithelial progenitors. NRL, CRX and NR2E3 are key transcriptional regulators that control photoreceptor differentiation. Mutations in NR2E3, a rod-specific orphan nuclear receptor, lead to loss of rods, increased density of S-cones and supernormal S-cone-mediated vision in humans. To better understand its in vivo function, NR2E3 was expressed ectopically in the Nrl-/- retina, where post-mitotic precursors fated to be rods develop into functional S-cones similar to the human NR2E3 disease. Expression of NR2E3 in the Nrl-/- retina completely suppressed cone differentiation and resulted in morphologically rod-like photoreceptors, which were however not functional. Gene profiling of FACS-purified photoreceptors confirmed the role of NR2E3 as a strong suppressor of cone genes but an activator of only a subset of rod genes (including rhodopsin) in vivo. Ectopic expression of NR2E3 in cone precursors and differentiating S-cones of wild-type retina also generated rod-like cells. The dual regulatory function of NR2E3 was not dependent upon the presence of NRL and/or CRX, but on the timing and level of its expression. Our studies reveal a critical role of NR2E3 in establishing functional specificity of NRL-expressing photoreceptor precursors during retinal neurogenesis.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Cheng H,Aleman TS,Cideciyan AV,Khanna R,Jacobson SG,Swaroop A

doi

10.1093/hmg/ddl185

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

2588-602

issue

17

eissn

0964-6906

issn

1460-2083

pii

ddl185

journal_volume

15

pub_type

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