Morphological Identification of Melanopsin-Expressing Retinal Ganglion Cell Subtypes in Mice

  • Seul Ki Lee
  • Tiffany M. SchmidtEmail author
Part of the Methods in Molecular Biology book series (MIMB, volume 1753)


Melanopsin-expressing, intrinsically photosensitive retinal ganglion cells (ipRGCs) are a relatively recently discovered class of photoreceptor. ipRGCs can be subdivided into at least five subtypes (M1-M5), each of which has a distinct complement of morphological and physiological properties. ipRGC subtypes can be identified morphologically based on a combination of dendritic morphology and immunostaining for a cell-type specific marker. In this chapter, we describe methods for conclusively identifying each of the five ipRGC subtypes through a combination of patch clamp electrophysiology, Neurobiotin filling, visualization of ipRGC dendrites, and immunostaining for the marker SMI-32.

Key words

Melanopsin Subtypes Patch clamp electrophysiology Dendritic stratification SMI-32 Retina Opn4 Mouse Intrinsically photosensitive retinal ganglion cell 


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of NeurobiologyNorthwestern UniversityEvanstonUSA

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