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Synopsis  All organisms must respond to environmental stimuli, and most metazoans do so through endocrine system regulation. Hormonal fluctuations allow organisms to maintain and return to homeostasis following perturbations, making them vital for survival and fitness. Many components of the endocrine system (e.g., proteins, steroids, receptors, genome response elements, etc.) and the physiological and behavioral processes they regulate are conserved among vertebrates (e.g., the glucocorticoid stress response). However, there are sometimes dramatic differences among and within species, particularly in how hormonal variation affects phenotypes. Some such variation is driven by internal factors such as genetics, developmental stage, sex, individual age, and body condition in addition to external factors such as the type, magnitude, and duration of environmental stimuli. Eco-evolutionary endocrinology has been quite successful in describing this variation among and within species, but we have only just begun to understand how these factors interact to affect phenotypic diversity, ecological function, and evolution. Mounting evidence suggests that various molecular epigenetic modifications of genome structure and activity, such as deoxyribonucleic acid methylation, histone modifications, non-coding RNAs, and small RNAs, mediate the interactions between environmental conditions, individual traits, and the endocrine system. As some epigenetic modifications can be induced or removed by environmental stimuli, they represent promising candidates underlying endocrine regulation and variation, particularly epigenetic marks that can be stably inherited. This symposium discussed the role of epigenetic modifications in endocrine systems, mainly in natural populations.

Theory, hormones and life history stages: an introduction to the symposium epigenetic variation in endocrine systems