ArticleInternational journal of molecular sciences2020
Heterogeneous Presynaptic Distribution of Munc13 Isoforms at Retinal Synapses and Identification of an Unconventional Bipolar Cell Type with Dual Expression of Munc13 Isoforms: A Study Using Munc13-EXFP Knock-in Mice.
Article in International journal of molecular sciences, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
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Who cites it
6 citing papers in PubMed, 4 citations in OpenAlex.
- The missing link: Piccolino is essential for tethering synaptic vesicles to rod photoreceptor ribbons.The Journal of cell biology · 2026Article
- Single-Cell Sequencing Analysis Reveals Dysregulated Energy Metabolism and Altered Synaptic Connectivity in the Mouse Retina Following Dark Rearing.Investigative ophthalmology & visual science · 2026Article
- Presynaptic Proteins and Their Roles in Visual Processing by the Retina.Annual review of vision science · 2024Review
- Development and maintenance of vision's first synapse.Developmental biology · 2021Review
- Cell Types and Synapses Expressing the SNARE Complex Regulating Proteins Complexin 1 and Complexin 2 in Mammalian Retina.International journal of molecular sciences · 2021Article
- Molecular Assembly and Structural Plasticity of Sensory Ribbon Synapses-A Presynaptic Perspective.International journal of molecular sciences · 2020Review
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Authors and funding
10 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Munc13 isoforms are constituents of the presynaptic compartment of chemical synapses, where they govern important steps in preparing synaptic vesicles for exocytosis. The role of Munc13-1, -2 and -3 is well documented in brain neurons, but less is known about their function and distribution among the neurons of the retina and their conventional and ribbon-type chemical synapses. Here, we examined the retinae of Munc13-1-, -2-, and -3-EXFP knock-in (KI) mice with a combination of immunocytochemistry, physiology, and electron microscopy. We show that knock-in of Munc13-EXFP fusion proteins did not affect overall retinal anatomy or synapse structure, but slightly affected synaptic transmission. By labeling Munc13-EXFP KI retinae with specific antibodies against Munc13-1, -2 and -3, we found that unlike in the brain, most retinal synapses seem to operate with a single Munc13 isoform. A surprising exception to this rule was type 6 ON bipolar cells, which expressed two Munc13 isoforms in their synaptic terminals, ubMunc13-2 and Munc13-3. The results of this study provide an important basis for future studies on the contribution of Munc13 isoforms in visual signal processing in the mammalian retina.
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