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ZFIN ID: ZDB-PUB-121205-41
Basal bodies exhibit polarized positioning in zebrafish cone photoreceptors
Ramsey, M., and Perkins, B.D.
Date: 2013
Source: The Journal of comparative neurology   521(8): 1803-1816 (Journal)
Registered Authors: Perkins, Brian
Keywords: basal body, cilia, zebrafish, polarity, retina, cones
MeSH Terms:
  • Animals
  • Animals, Genetically Modified
  • Arrestins/genetics
  • Arrestins/metabolism
  • Cell Polarity/physiology*
  • Cilia/physiology
  • Green Fluorescent Proteins/genetics
  • Green Fluorescent Proteins/metabolism
  • Larva
  • Opsins/metabolism
  • Retina/cytology*
  • Retinal Cone Photoreceptor Cells/physiology*
  • Retinal Cone Photoreceptor Cells/ultrastructure*
  • Retinal Photoreceptor Cell Inner Segment/physiology
  • Tubulin/metabolism
  • Zebrafish/anatomy & histology
PubMed: 23171982 Full text @ J. Comp. Neurol.

The asymmetric positioning of basal bodies, and therefore cilia, is often critical for proper cilia function. This planar polarity is critical for motile cilia function but has not been extensively investigated for non-motile cilia or for sensory cilia such as vertebrate photoreceptors. Zebrafish photoreceptors form an organized mosaic ideal for investigating cilia positioning. We report that in the adult retina, the basal bodies of red-, green-, and blue-sensitive cone photoreceptors localized asymmetrically on the cell edge nearest to the optic nerve. In contrast, no patterning was seen in the basal bodies of ultraviolet-sensitive cones or in rod photoreceptors. The asymmetric localization of basal bodies was consistent in all regions of the adult retina. Basal body patterning was unaffected in the cones of the XOPS-mCFP transgenic line, which lacks rod photoreceptors. Finally, the adult pattern was not seen in 7 day post fertilization (dpf) larvae as basal bodies were randomly distributed in all the photoreceptor subtypes. These results establish the asymmetrical localization of basal bodies in red-, green-, and blue-sensitive cones in adult zebrafish retinas but not in larvae. This pattern suggests an active cellular mechanism regulated the positioning of basal bodies after the transition to the adult mosaic and that rods do not seem to be necessary for the patterning of cone basal bodies.