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Updated: Apr 6, 2026
14:35
Single-cell Suction Recordings from Mouse Cone Photoreceptors
Published on: January 5, 2010
12.1K
Characterizing the rod pathway in cone-dominated thirteen-lined ground squirrels.
Riley Ferguson1, Kiyoharu J Miyagishima1, Francisco M Nadal-Nicolas1
1Retinal Neurophysiology Section, National Eye Institute, National Institutes of Health, Bethesda, MD, USA.
Frontiers in Ophthalmology
|July 8, 2024
Summary
AII-amacrine cells (AIIs) in thirteen-lined ground squirrels (TLGS) are sparsely distributed, suggesting a primary role in night vision rather than fine-detail cone signaling. Their function appears conserved, differing from mouse AIIs.
Area of Science:
- Neuroscience
- Ophthalmology
- Retinal Biology
Background:
- AII-amacrine cells (AIIs) are crucial for scotopic (night) vision in mammalian retinas.
- Their role in cone-dominant species like thirteen-lined ground squirrels (TLGS) is less understood compared to rod-dominant species.
Purpose of the Study:
- To investigate the morphology and function of AIIs and the rod pathway in the cone-dominant TLGS retina.
- To compare the structure and function of AIIs in TLGS with those in rod-dominant species.
Main Methods:
- Immunohistochemistry to identify AIIs (calretinin-positive) and their connections (Connexin36 for gap junctions).
- Electrophysiological approaches, including single photoreceptor recordings and full-field electroretinograms (ERGs).
Main Results:
- TLGS AIIs are calretinin-positive, connect to rod bipolar cells, and show decreased density and expanded arborization compared to rod-dominant species.
- Scotopic ERG responses in TLGS are mediated by both rods and cones, indicating conserved rod pathway components.
- AIIs in TLGS connect via gap junctions (Connexin36) but their sparse distribution suggests a limited role in fine-spatial cone signaling.
Conclusions:
- The rod pathway is conserved in TLGS, with AIIs functioning primarily in night vision, consistent with their 'rod' amacrine cell role.
- The expanded role of AIIs in mouse cone signaling may be an adaptation due to the mouse's rod-dominant retina.
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