Abstract
Genetic manipulation is widely used to research the central nervous system (CNS). The manipulation of molecular expression in a small number of neurons permits the detailed investigation of the role of specific molecules on the function and morphology of the neurons. Electroporation is a broadly used technique for gene transfer in the CNS. However, the targeting of gene transfer using electroporation in postnatal animals was restricted to the cortex, hippocampus, or the region facing the ventricle in previous reports. Electroporation targeting of deep brain structures, such as the thalamus, has been difficult. We introduce a novel electroporation technique that enables gene transfer to a physiologically identified deep brain region using a glass pipette. We recorded neural activity in young-adult mice to identify the location of the lateral geniculate nucleus (LGN) of the thalamus, using a glass pipette electrode containing the plasmid DNA encoding enhanced green fluorescent protein (EGFP). The location of the LGN was confirmed by monitoring visual responses, and the plasmid solution was pressure-injected into the recording site. Voltage pulses were delivered through the glass pipette electrode. Several EGFP-labeled somata and dendrites were observed in the LGN after a few weeks, and labeled axons were found in the visual cortex. The EGFP-expressing structures were observed in detail sufficient to reconstruct their morphology in three dimensions. We further confirmed the applicability of this technique in cats. This method should be useful for the transfer of various genes into cells in physiologically identified brain regions in rodents and gyrencephalic mammals.
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Acknowledgments
We thank Dr. Yasuaki Shirayoshi (Tottori Univ., Japan) for providing plasmids, pCAG-EGFP. This work was supported by MEXT KAKENHI Grant Number 22115010 (Y.H.) and JSPS KAKENHI Grant Number 24650208 (Y.H., T.S.).
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The authors declare that they have no conflict of interest.
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Ohmura, N., Kawasaki, K., Satoh, T. et al. In vivo electroporation to physiologically identified deep brain regions in postnatal mammals. Brain Struct Funct 220, 1307–1316 (2015). https://doi.org/10.1007/s00429-014-0724-x
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DOI: https://doi.org/10.1007/s00429-014-0724-x