LRIT3 Differentially Affects Connectivity and Synaptic Transmission of Cones to ON- and OFF-Bipolar Cells
Identifieur interne : 000039 ( Main/Exploration ); précédent : 000038; suivant : 000040LRIT3 Differentially Affects Connectivity and Synaptic Transmission of Cones to ON- and OFF-Bipolar Cells
Auteurs : Marion Neuillé [France] ; Yan Cao [États-Unis] ; Romain Caplette [France] ; Debbie Guerrero-Given [États-Unis] ; Connon Thomas [États-Unis] ; Naomi Kamasawa [États-Unis] ; José-Alain Sahel [France] ; Christian P. Hamel [France] ; Isabelle Audo [France] ; Serge Picaud [France] ; Kirill A. Martemyanov [États-Unis] ; Christina Zeitz [France]Source :
- Investigative Ophthalmology & Visual Science [ 0146-0404 ] ; 2017.
English descriptors
- mix :
Abstract
Purpose: Mutations in LRIT3 lead to complete congenital stationary night blindness (cCSNB). Using a cCSNB mouse model lacking Lrit3 (nob6), we recently have shown that LRIT3 has a role in the correct localization of TRPM1 (transient receptor potential melastatin 1) to the dendritic tips of ON-bipolar cells (BCs), contacting both rod and cone photoreceptors. Furthermore, postsynaptic clustering of other mGluR6 cascade components is selectively eliminated at the dendritic tips of cone ON-BCs. The purpose of this study was to further define the role of LRIT3 in structural and functional organization of cone synapses.Methods: Exhaustive electroretinogram analysis was performed in a patient with LRIT3 mutations. Multielectrode array recordings were performed at the level of retinal ganglion cells in nob6 mice. Targeting of GluR1 and GluR5 at the dendritic tips of OFF-BCs in nob6 retinas was assessed by immunostaining and confocal microscopy. The ultrastructure of photoreceptor synapses was evaluated by electron microscopy in nob6 mice.Results: The patient with LRIT3 mutations had a selective ON-BC dysfunction with relatively preserved OFF-BC responses. In nob6 mice, complete lack of ON-pathway function with robust, yet altered signaling processing in OFF-pathways was detected. Consistent with these observations, molecules essential for the OFF-BC signaling were normally targeted to the synapse. Finally, synaptic contacts made by ON-BC but not OFF-BC neurons with the cone pedicles were disorganized without ultrastructural alterations in cone terminals, horizontal cell processes, or synaptic ribbons.Conclusions: These results suggest that LRIT3 is likely involved in coordination of the transsynaptic communication between cones and ON-BCs during synapse formation and function.
Url:
DOI: 10.1167/iovs.16-20745
Affiliations:
Links toward previous steps (curation, corpus...)
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Le document en format XML
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<author><name sortKey="Picaud, Serge" sort="Picaud, Serge" uniqKey="Picaud S" first="Serge" last="Picaud">Serge Picaud</name>
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<author><name sortKey="Martemyanov, Kirill A" sort="Martemyanov, Kirill A" uniqKey="Martemyanov K" first="Kirill A." last="Martemyanov">Kirill A. Martemyanov</name>
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<author><name sortKey="Zeitz, Christina" sort="Zeitz, Christina" uniqKey="Zeitz C" first="Christina" last="Zeitz">Christina Zeitz</name>
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<orgName>Institut de la Vision</orgName>
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<idno type="DOI">10.1167/iovs.16-20745</idno>
<series><title level="j">Investigative Ophthalmology & Visual Science</title>
<idno type="ISSN">0146-0404</idno>
<imprint><date type="datePub">2017</date>
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<profileDesc><textClass><keywords scheme="mix" xml:lang="en"><term>LRIT3</term>
<term>congenital stationary night blindness</term>
<term>electron microscopy</term>
<term>multielectrode array</term>
<term>retina</term>
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<front><div type="abstract" xml:lang="en"> Purpose: Mutations in LRIT3 lead to complete congenital stationary night blindness (cCSNB). Using a cCSNB mouse model lacking Lrit3 (nob6), we recently have shown that LRIT3 has a role in the correct localization of TRPM1 (transient receptor potential melastatin 1) to the dendritic tips of ON-bipolar cells (BCs), contacting both rod and cone photoreceptors. Furthermore, postsynaptic clustering of other mGluR6 cascade components is selectively eliminated at the dendritic tips of cone ON-BCs. The purpose of this study was to further define the role of LRIT3 in structural and functional organization of cone synapses.Methods: Exhaustive electroretinogram analysis was performed in a patient with LRIT3 mutations. Multielectrode array recordings were performed at the level of retinal ganglion cells in nob6 mice. Targeting of GluR1 and GluR5 at the dendritic tips of OFF-BCs in nob6 retinas was assessed by immunostaining and confocal microscopy. The ultrastructure of photoreceptor synapses was evaluated by electron microscopy in nob6 mice.Results: The patient with LRIT3 mutations had a selective ON-BC dysfunction with relatively preserved OFF-BC responses. In nob6 mice, complete lack of ON-pathway function with robust, yet altered signaling processing in OFF-pathways was detected. Consistent with these observations, molecules essential for the OFF-BC signaling were normally targeted to the synapse. Finally, synaptic contacts made by ON-BC but not OFF-BC neurons with the cone pedicles were disorganized without ultrastructural alterations in cone terminals, horizontal cell processes, or synaptic ribbons.Conclusions: These results suggest that LRIT3 is likely involved in coordination of the transsynaptic communication between cones and ON-BCs during synapse formation and function. </div>
</front>
</TEI>
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<tree><country name="France"><noRegion><name sortKey="Neuille, Marion" sort="Neuille, Marion" uniqKey="Neuille M" first="Marion" last="Neuillé">Marion Neuillé</name>
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<name sortKey="Caplette, Romain" sort="Caplette, Romain" uniqKey="Caplette R" first="Romain" last="Caplette">Romain Caplette</name>
<name sortKey="Hamel, Christian P" sort="Hamel, Christian P" uniqKey="Hamel C" first="Christian P." last="Hamel">Christian P. Hamel</name>
<name sortKey="Picaud, Serge" sort="Picaud, Serge" uniqKey="Picaud S" first="Serge" last="Picaud">Serge Picaud</name>
<name sortKey="Sahel, Jose Alain" sort="Sahel, Jose Alain" uniqKey="Sahel J" first="José-Alain" last="Sahel">José-Alain Sahel</name>
<name sortKey="Zeitz, Christina" sort="Zeitz, Christina" uniqKey="Zeitz C" first="Christina" last="Zeitz">Christina Zeitz</name>
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<country name="États-Unis"><noRegion><name sortKey="Cao, Yan" sort="Cao, Yan" uniqKey="Cao Y" first="Yan" last="Cao">Yan Cao</name>
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<name sortKey="Guerrero Given, Debbie" sort="Guerrero Given, Debbie" uniqKey="Guerrero Given D" first="Debbie" last="Guerrero-Given">Debbie Guerrero-Given</name>
<name sortKey="Kamasawa, Naomi" sort="Kamasawa, Naomi" uniqKey="Kamasawa N" first="Naomi" last="Kamasawa">Naomi Kamasawa</name>
<name sortKey="Martemyanov, Kirill A" sort="Martemyanov, Kirill A" uniqKey="Martemyanov K" first="Kirill A." last="Martemyanov">Kirill A. Martemyanov</name>
<name sortKey="Thomas, Connon" sort="Thomas, Connon" uniqKey="Thomas C" first="Connon" last="Thomas">Connon Thomas</name>
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