Abstract
Novel neuromodulation techniques in the field of brain research, such as optogenetics, prompt to target specific cell populations. However, not every subpopulation can be distinguished based on brain area or activity of specific promoters, but rather on topology and connectivity. A fascinating tool to detect neuronal circuitry is based on the transsynaptic tracer, wheat germ agglutinin (WGA). When expressed in neurons, it is transported throughout the neuron, secreted, and taken up by synaptically connected neurons. Expression of a WGA and Cre recombinase fusion protein using a viral vector technology in Cre-dependent transgenic animals allows to trace neuronal network connections and to induce topological transgene expression. In this study, we applied and evaluated this technology in specific areas throughout the whole rodent brain, including the hippocampus, striatum, substantia nigra, and the motor cortex. Adeno-associated viral vectors (rAAV) encoding the WGA–Cre fusion protein under control of a CMV promoter were stereotactically injected in Rosa26-STOP-EYFP transgenic mice. After 6 weeks, both the number of transneuronally labeled YFP+/mCherry− cells and the transduced YFP+/mCherry+ cells were quantified in the connected regions. We were able to trace several connections using WGA–Cre transneuronal labeling; however, the labeling efficacy was region-dependent. The observed transneuronal labeling mostly occurred in the anterograde direction without the occurrence of multi-synaptic labeling. Furthermore, we were able to visualize a specific subset of newborn neurons derived from the subventricular zone based on their connectivity.
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Abbreviations
- AcbC:
-
Accumbens nucleus, core
- AcbSh:
-
Accumbens nucleus, shell
- AD:
-
Anterodorsal thalamic nucleus
- AM:
-
Anteromedial thalamic nucleus
- APT:
-
Anterior pretectal nucleus
- AV:
-
Anteroventral thalamic nucleus
- AVDM:
-
Anteroventral thalamic nucleus, dorsomedial part
- AVVL:
-
Anteroventral thalamic nucleus, ventrolateral part
- CL:
-
Centrolateral thalamic nucleus
- CPu:
-
Caudate putamen
- HDB:
-
Nucleus of the horizontal limb of the diagonal band
- IAD:
-
Interanterodorsal thalamic nucleus
- F:
-
Nucleus of the fields of Forel
- fi:
-
Fimbria of the hippocampus
- fr:
-
Fasciculus retroflexus
- LGP:
-
Lateral globus pallidus
- LM:
-
Lateral mammillary nucleus
- LDVL:
-
Laterodorsal thalamic nucleus, ventral part
- LM:
-
Lateral mammillary nucleus
- LPMR:
-
Lateral posterior thalamic nucleus, mediorostral part
- LSD:
-
Lateral septal nucleus, dorsal part
- LSI:
-
Lateral septal nucleus, intermediate part
- LSV:
-
Lateral septal nucleus, ventral part
- MD:
-
Mediodorsal thalamic nucleus
- ml:
-
Medial lemniscus
- ML:
-
Medial mammillary nucleus, lateral part
- MM:
-
Medial mammillary nucleus, medial part
- MMn:
-
Medial mammillary nucleus, median part
- MS:
-
Medial septal nucleus
- Rt:
-
Reticular thalamic nucleus
- SFi:
-
Septofimbrial nucleus
- st:
-
Stria terminalis
- Shi:
-
Septohippocampal nucleus
- sm:
-
Stria medullaris of the thalamus
- SNC:
-
Substantia nigra, compact part
- SNR:
-
Substantia nigra, reticular part
- SuML:
-
Supramammillary nucleus, lateral part
- SuMM:
-
Supramammillary nucleus, medial part
- sumx:
-
Supramammillary decussation
- VA–VL:
-
Ventral anterior—ventrolateral thalamic nucleus
- VM:
-
Ventromedial thalamic nucleus
- VPM:
-
Ventral posteromedial thalamic nucleus
- VTA:
-
Ventral tegmental area
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Acknowledgments
The authors would like to thank the Leuven Viral Vector Core for the construction and production of the rAAV vectors and Prof Lieve Moons and Prof Lut Arckens for the use of the confocal laser scanning microscope. The research presented in this paper has received funding from the Fund for Scientific Research-Flanders (FWO—fellowship to SL), the European projects FP7-ICT-2011-C-284801 ENLIGHTENMENT and FP7 HEALTH-F2-2011-278850 (INMiND), the Flemish Agency for Innovation through Science and Technology (IWT—SBO/110068 Optobrain) and the KU Leuven (OT/14/120).
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Libbrecht, S., Van den Haute, C., Malinouskaya, L. et al. Evaluation of WGA–Cre-dependent topological transgene expression in the rodent brain. Brain Struct Funct 222, 717–733 (2017). https://doi.org/10.1007/s00429-016-1241-x
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DOI: https://doi.org/10.1007/s00429-016-1241-x