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Cortical VIP+ Interneurons in the Upper and Deeper Layers Are Transcriptionally Distinct

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Abstract

Different interneuron classes have distinct laminar distribution patterns which contribute to the layer-specific organization of cortical microcircuits. However, laminar differences within the same interneuron classes are not well recognized. Despite systematic efforts towards neuron cell-type taxonomy in the neocortex by single-cell transcriptomics, less attention has been driven towards laminar differences in interneurons compared to projection neurons. VIP+ interneurons are the major interneuron class that mostly populate superficial layers and mediate disinhibition. A few reports noted the morphological and electrophysiological differences between VIP+ interneurons residing in layers I–III (upper layer) and layers IV–VI (deeper layer), but little is known about their molecular differences. Here, we delineated the laminar difference in their transcriptome employing single-cell RNA sequencing (scRNAseq) data from public databases. Analysis of 1175 high-quality VIP+ interneurons in the primary visual cortex (VISp) showed that the upper layer and deeper layer VIP+ interneurons are transcriptionally distinct distinguished by genes implicated in synapse organization and regulation of membrane potential. Similar differences are also observed in the anterior lateral motor cortex (ALM) and primary motor cortex (MOp). Cross-comparing between the top 10 differentially expressed genes (DEGs) with Allen Mouse Brain in situ hybridization database, we identified Tac2 and CxCl14 as potential marker genes of upper layer VIP+ interneurons across most cortical regions. Importantly, such expression patterns are conserved in the human brain. Together, we revealed significant laminar differences in transcriptomic profiles within VIP+ interneurons, which provided new insight into their molecular heterogeneity that may contribute to their functional diversity.

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The data that support the findings of this study are included in the supplementary materials.

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Acknowledgements

We thank Dr. Wei He and Prof. Yin Zhu from Institutes of Brain Science, Fudan University for their technical assistance and insightful advice throughout the course of this study. We thank Profs. Qiufu Ma from Harvard Medical School and Longzhen Chen from Southern University of Science and Technology for providing Tac2Cre mice.

Funding

This work was supported by funds from the National Key R&D Program of China (2018YFA0108000), National Natural Science Foundation of China (32171087, 31771196, 31970971), Shanghai Municipal Science and Technology Major Project (No. 2018SHZDZX01), and ZJLab.

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JW and MH conceived and designed the study. MH provided the funding. JW conducted all the experiments, analyses, prepared all the figures, and wrote the drafts of the manuscript. ZZ and MH were involved in a substantive review of the manuscript. YS assisted with mouse breeding. All the authors read and approved the final manuscript.

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Correspondence to Miao He.

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The authors declare no competing interests.

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The authors declare no competing interests.

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Wu, J., Zhao, Z., Shi, Y. et al. Cortical VIP+ Interneurons in the Upper and Deeper Layers Are Transcriptionally Distinct. J Mol Neurosci 72, 1779–1795 (2022). https://doi.org/10.1007/s12031-022-02040-8

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  • DOI: https://doi.org/10.1007/s12031-022-02040-8

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