Plasticity-related genes in brain development and amygdala-dependent learning

Area of Science:

• Neuroscience
• Developmental Biology
• Molecular Biology

Background:

• The amygdala, a temporal lobe structure, is crucial for learning about motivationally important stimuli.
• Amygdala-dependent learning involves plasticity-related signaling pathways that are also implicated in brain development.
• Signaling pathways in juveniles may influence both learning and neural development concurrently.

Purpose of the Study:

• To review the functions of the brain-derived neurotrophic factor (BDNF), extracellular signaling-related kinases (ERKs), and cyclic AMP-response element binding protein (CREB) signaling pathway.
• To discuss the intersection of learning-related and developmental plasticity in the immature amygdala.
• To propose how learning influences the developmental trajectory of amygdala function.

Main Methods:

• Literature review of plasticity-related signaling pathways.
• Analysis of the roles of BDNF, ERKs, and CREB in nervous system development and amygdala-dependent learning.
• Discussion of the impact of aversive and appetitive learning on immature amygdala development.

Main Results:

• The BDNF-ERK-CREB pathway plays pleiotropic roles in both nervous system development and amygdala-dependent learning.
• Learning-dependent activation of this pathway in the immature amygdala influences its developmental trajectory.
• This signaling cascade impacts the development of amygdala excitability and environmental sensitivity.

Conclusions:

• Learning in the immature amygdala, via BDNF-ERK-CREB signaling, can exaggerate and accelerate neural development.
• This process promotes heightened amygdala excitability and environmental sensitivity in later life.
• The interplay between learning and developmental plasticity in the young amygdala has long-lasting consequences for brain function.