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Transgenic Strategies for Sparse but Strong Expression of Genetically Encoded Voltage and Calcium Indicators

Rapidly progressing development of optogenetic tools, particularly genetically encoded optical indicators, enables monitoring activities of neuronal circuits of identified cell populations in longitudinal in vivo studies. Recently developed advanced transgenic approaches achieve high levels of indic...

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Detalles Bibliográficos
Autores principales: Song, Chenchen, Do, Quyen B., Antic, Srdjan D., Knöpfel, Thomas
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5535952/
https://www.ncbi.nlm.nih.gov/pubmed/28686207
http://dx.doi.org/10.3390/ijms18071461
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author Song, Chenchen
Do, Quyen B.
Antic, Srdjan D.
Knöpfel, Thomas
author_facet Song, Chenchen
Do, Quyen B.
Antic, Srdjan D.
Knöpfel, Thomas
author_sort Song, Chenchen
collection PubMed
description Rapidly progressing development of optogenetic tools, particularly genetically encoded optical indicators, enables monitoring activities of neuronal circuits of identified cell populations in longitudinal in vivo studies. Recently developed advanced transgenic approaches achieve high levels of indicator expression. However, targeting non-sparse cell populations leads to dense expression patterns such that optical signals from neuronal processes cannot be allocated to individual neurons. This issue is particularly pertinent for the use of genetically encoded voltage indicators whose membrane-delimited signals arise largely from the neuropil where dendritic and axonal membranes of many cells intermingle. Here we address this need for sparse but strong expression of genetically encoded optical indicators using a titratable recombination-activated transgene transcription to achieve a Golgi staining-type indicator expression pattern in vivo. Using different transgenic strategies, we also illustrate that co-expression of genetically encoded voltage and calcium indicators can be achieved in vivo for studying neuronal circuit input–output relationships.
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spelling pubmed-55359522017-08-04 Transgenic Strategies for Sparse but Strong Expression of Genetically Encoded Voltage and Calcium Indicators Song, Chenchen Do, Quyen B. Antic, Srdjan D. Knöpfel, Thomas Int J Mol Sci Article Rapidly progressing development of optogenetic tools, particularly genetically encoded optical indicators, enables monitoring activities of neuronal circuits of identified cell populations in longitudinal in vivo studies. Recently developed advanced transgenic approaches achieve high levels of indicator expression. However, targeting non-sparse cell populations leads to dense expression patterns such that optical signals from neuronal processes cannot be allocated to individual neurons. This issue is particularly pertinent for the use of genetically encoded voltage indicators whose membrane-delimited signals arise largely from the neuropil where dendritic and axonal membranes of many cells intermingle. Here we address this need for sparse but strong expression of genetically encoded optical indicators using a titratable recombination-activated transgene transcription to achieve a Golgi staining-type indicator expression pattern in vivo. Using different transgenic strategies, we also illustrate that co-expression of genetically encoded voltage and calcium indicators can be achieved in vivo for studying neuronal circuit input–output relationships. MDPI 2017-07-07 /pmc/articles/PMC5535952/ /pubmed/28686207 http://dx.doi.org/10.3390/ijms18071461 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Song, Chenchen
Do, Quyen B.
Antic, Srdjan D.
Knöpfel, Thomas
Transgenic Strategies for Sparse but Strong Expression of Genetically Encoded Voltage and Calcium Indicators
title Transgenic Strategies for Sparse but Strong Expression of Genetically Encoded Voltage and Calcium Indicators
title_full Transgenic Strategies for Sparse but Strong Expression of Genetically Encoded Voltage and Calcium Indicators
title_fullStr Transgenic Strategies for Sparse but Strong Expression of Genetically Encoded Voltage and Calcium Indicators
title_full_unstemmed Transgenic Strategies for Sparse but Strong Expression of Genetically Encoded Voltage and Calcium Indicators
title_short Transgenic Strategies for Sparse but Strong Expression of Genetically Encoded Voltage and Calcium Indicators
title_sort transgenic strategies for sparse but strong expression of genetically encoded voltage and calcium indicators
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5535952/
https://www.ncbi.nlm.nih.gov/pubmed/28686207
http://dx.doi.org/10.3390/ijms18071461
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