Cortical integration of higher-order thalamic inputs is lineage-dependent

• Published in: bioRxiv
• Main Authors: Buchan, Matthew J, Mahfooz, Kashif, Van Rheede, Joram J, Gothard, Gemma, Avery, Sophie V, Ellender, Tommas J, Newey, Sarah E, Akerman, Colin J
• Format: Paper
• Language: English
• Published: Cold Spring Harbor Cold Spring Harbor Laboratory Press 30.03.2022
• Subjects: Cortex (somatosensory); Progenitor cells; Sensory integration; Stem cells; Thalamic nuclei; Thalamus
• DOI: 10.1101/2022.03.28.486015

Primary sensory cortex receives and integrates inputs from first-order and higher-order thalamic nuclei. First-order inputs convey sensory information from the periphery and exhibit simple response properties, whereas higher-order inputs exhibit more complex response properties, provide contextual feedback, and can modulate first-order inputs. Here we show that the way in which cortical neurons integrate these thalamic inputs, reflects the progenitor cell from which the cortical neurons derive. Within layer 4 of mouse primary somatosensory cortex, excitatory neurons that derive from apical intermediate progenitors exhibit multi-whisker response properties and receive higher-order thalamic input, in a manner consistent with their dendritic morphology. These properties depend upon the expression levels of the transcription factor Lhx2, which when increased, abolishes the higher-order properties of apical intermediate progenitor-derived neurons, and disrupts the induction of sensory-evoked plasticity. These data reveal a lineage-dependent mechanism that establishes the integration and functional contribution of higher-order thalamic inputs within cortex. Competing Interest Statement The authors have declared no competing interest.