A comprehensive spatio-cellular map of the human hypothalamus

Area of Science:

• Neuroscience
• Genomics
• Systems Biology

Background:

• The hypothalamus regulates vital functions, but human cellular details remain elusive, largely inferred from rodent models.
• Understanding human hypothalamic cell types and circuits is crucial for treating complex disorders.

Purpose of the Study:

• To create a comprehensive spatial and cellular transcriptional map of the human hypothalamus (HYPOMAP).
• To identify human-specific hypothalamic cell types and their relation to body mass index (BMI).

Main Methods:

• Single-nucleus sequencing of over 433,000 human hypothalamic cells.
• Integration with spatial transcriptomics to create the HYPOMAP atlas.
• Analysis of genome-wide association study (GWAS) data for BMI-related genes.

Main Results:

• High, yet incomplete, conservation of neuronal cell types between humans and mice.
• Identified significant differences in pro-opiomelanocortin neurons and G-protein-coupled receptors, impacting obesity treatment understanding.
• Discovered 291 neuronal clusters enriched for BMI GWAS genes, implicating six genes (including novel CORO1A) in BMI regulation.

Conclusions:

• HYPOMAP provides an unprecedented spatial atlas of the human hypothalamus.
• Reveals critical human-specific cellular and genetic insights relevant to metabolic disorders.
• Offers a resource for identifying novel therapeutic targets for reproductive, circadian, and metabolic diseases.