Intersection of transient cell states with stable cell types in hippocampus

Area of Science:

• Neuroscience
• Genomics
• Molecular Biology

Background:

• Brain cell transcriptomes reflect identity and dynamic responses.
• Categorizing brain cell types is advancing, but linking identity and state is challenging.

Purpose of the Study:

• To analyze cell-type, activity, and circadian-dependent transcriptional programs in the mouse hippocampus.
• To investigate the relationship between transcriptional identity and state.

Main Methods:

• Single-nucleus RNA sequencing of the mouse hippocampus.
• Analysis across physiological/pathological stimuli and circadian phases.

Main Results:

• Cell types remain largely stable across different activity states, except in the dentate gyrus.
• Activity and circadian rhythms induce distinct, largely nonoverlapping transcriptional responses.
• Convergent regulation observed on genes in pathways like endocannabinoid signaling and chromatin remodeling.

Conclusions:

• Transcriptional identity and state are distinct but integrated aspects of cell function.
• A unified analysis of cell-type taxonomy and transcriptional state is necessary.
• This approach captures diverse cell responses to experience.