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Updated: Jul 6, 2025
10:59
Generation and Characterization of Human Induced Pluripotent Stem Cell-derived Astrocytes Lacking Fragile X Messenger Ribonucleoprotein
Published on: June 6, 2025
340
Astrocytes Drive Divergent Metabolic Gene Expression in Humans and Chimpanzees.
Trisha M Zintel1,2, Jason Pizzollo1,2, Christopher G Claypool3
1Department of Biology, University of Massachusetts Amherst, Amherst, MA, USA.
Genome Biology and Evolution
|December 30, 2023
Summary
Human astrocytes, not neurons, show key gene expression differences impacting brain metabolism compared to chimpanzees. This suggests astrocytes played a significant role in the evolution of human brain energy usage.
Area of Science:
- Neuroscience
- Genomics
- Evolutionary Biology
Background:
- The human brain's high metabolic demand (∼20% of body's resources) contrasts with chimpanzee brains (<10%).
- Previous studies identified interspecies differences in primate brain metabolic gene expression, but cell type-specific contributions remain unclear.
Purpose of the Study:
- To investigate cell type-specific gene expression differences in human versus chimpanzee brains.
- To determine the role of distinct brain cell types (neural progenitor cells, neurons, astrocytes) in metabolic evolution.
Main Methods:
- RNA sequencing (RNA-seq) was performed on human and chimpanzee neural progenitor cells, neurons, and astrocytes derived from induced pluripotent stem cells.
- Interspecies differential gene expression analysis and pathway enrichment analysis were conducted.
Main Results:
- Astrocytes exhibited twice as many differentially expressed genes (12.2%) compared to neurons (5.8%) between humans and chimpanzees.
- Pathway analysis indicated significant divergence in astrocytes, not neurons, for genes involved in glucose/lactate transport, pyruvate processing, and oxidative phosphorylation.
Conclusions:
- Astrocytes, rather than neurons, show greater interspecies gene expression divergence related to core metabolic pathways.
- These findings highlight the significant contribution of astrocytes to the evolution of enhanced brain glucose metabolism in the human lineage.
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