Impact of developmental temperature on neural growth, connectivity, and function
Pascal Züfle1, Leticia L Batista1, Sofia C Brandão1
1Johannes Gutenberg University, Mainz, Germany.
Science Advances
|January 15, 2025
Summary
Environmental temperature influences brain development in fruit flies. Lower temperatures lead to increased brain connectivity, affecting how flies process smells and potentially offering adaptive advantages.
Area of Science:
- Developmental biology
- Neuroscience
- Animal behavior
Background:
- Environmental temperature is a key factor influencing the development rate of ectothermic (cold-blooded) organisms.
- In Drosophila, cooler developmental temperatures correlate with enhanced brain connectivity, but the broader implications across temperatures and brain regions remain largely unknown.
Purpose of the Study:
- To investigate how developmental temperature affects brain connectivity scaling across different temperatures and brain regions in Drosophila.
- To explore the functional consequences of temperature-dependent wiring on olfactory processing and innate behaviors.
Main Methods:
- Developed a first-principle model to describe metabolic constraints on brain and organismal growth.
- Utilized the model to predict brain wiring patterns under temperature fluctuations.
- Analyzed olfactory pathway circuit architecture and neuronal function in Drosophila reared at different temperatures.
Main Results:
- Brain connectivity exhibits continuous scaling with developmental temperature, consistent with the proposed model.
- The model accurately predicts brain wiring under temperature cycles and non-uniform developmental timing.
- While odor encoding in early olfactory neurons remains stable, developmental temperature alters connections to third-order neurons, impacting innate odor-driven behaviors.
Conclusions:
- Neural development and brain wiring show significant plasticity in response to environmental temperature.
- Specific neural computations are robust to temperature-induced wiring changes, while others demonstrate adaptive phenotypic plasticity.
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