SH2B1 Tunes Hippocampal ERK Signaling to Influence Fluid Intelligence in Humans and Mice

Area of Science:

• Neuroscience
• Genetics
• Cognitive Science

Background:

• Fluid intelligence is crucial for human development and well-being.
• Understanding its genetic and neural basis is challenging.
• Mapping intelligence correlations aids this understanding.

Purpose of the Study:

• Investigate genetic architecture linking fluid intelligence and obesity risk.
• Identify novel genetic loci associated with fluid intelligence and metabolism.
• Explore the role of SH2B1 in fluid intelligence and hippocampal function.

Main Methods:

• Genome-wide association study using UK Biobank fluid intelligence scores.
• Genetic ablation of SH2B1 in mouse hippocampus (inhibitory vs. excitatory neurons).
• Single-cell profiling of Sh2B1-regulated pathways and ERK signaling.

Main Results:

• Identified novel genetic loci (SH2B1, TUFM, ATP2A1, FOXO3) for fluid intelligence-metabolism association.
• SH2B1 variation affects fluid intelligence independently of metabolism, influencing hippocampal volume.
• Mouse model showed SH2B1 ablation impairs specific cognitive functions via ERK signaling.

Conclusions:

• SH2B1 plays a significant role in fluid intelligence, independent of metabolic effects.
• SH2B1 influences cognitive function through hippocampal pathways, particularly in inhibitory neurons.
• Findings provide cross-species insights into the genetic and neural basis of intelligence and mental health.