Mislocalization of cone nuclei impairs cone function in mice

Yunlu Xue, David Razafsky, Didier Hodzic, Vladimir J. Kefalov

Research output: Contribution to journalArticle

Abstract

The nuclei of cone photoreceptors are located on the apical side of the outer nuclear layer (ONL) in vertebrate retinas. However, the functional role of this evolutionarily conserved localization of cone nuclei is unknown. We previously showed that Linkers of the Nucleoskeleton to the Cytoskeleton (LINC complexes) are essential for the apical migration of cone nuclei during development. Here, we developed an efficient genetic strategy to disrupt cone LINC complexes in mice. Experiments with animals from both sexes revealed that disrupting cone LINC complexes resulted in mislocalization of cone nuclei to the basal side of ONL in mouse retina. This, in turn, disrupted cone pedicle morphology, and appeared to reduce the efficiency of synaptic transmission from cones to bipolar cells. Although we did not observe other developmental or phototransduction defects in cones with mislocalized nuclei, their dark adaptation was impaired, consistent with a deficiency in chromophore recycling. These findings demonstrate that the apical localization of cone nuclei in the ONL is required for the timely dark adaptation and efficient synaptic transmission in cone photoreceptors.

Original languageEnglish
Pages (from-to)10242-10249
Number of pages8
JournalFASEB Journal
Volume34
Issue number8
DOIs
StatePublished - Aug 1 2020

Keywords

  • LINC complex
  • cone photoreceptor
  • dark adaptation
  • nucleus migration
  • retina electrophysiology
  • retinal degeneration

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