Genetic architecture of basal heart rate and its modulation by dietary salt in Drosophila melanogaster.

Genetic architecture of basal heart rate in Drosophila melanogaster is shaped by environment-dependent gene variants, with 154 lines showing significant genetic variation and sex-specific effects.

• Why it matters: Understanding how genetic and environmental factors interact to influence heart rate is crucial for insights into cardiac physiology and stress responses, yet these mechanisms remain poorly understood.
• What they did: Researchers analyzed 154 DGRP lines, measuring heart rate during larval stages under standard and salt-stressed conditions, and identified gene variants associated with ion transport, cardiac development, and stress response through genome-wide association studies and RNAi validation.
• The result: Findings demonstrate that salt stress reveals cryptic genetic variation affecting heart rate, with distinct gene sets involved under different conditions, providing a framework for linking natural genetic variation to physiological traits in a context-dependent manner.