A gene known for its crucial role during brain development before birth has been discovered to continue its influence far beyond childhood. According to a study by researchers at the Weizmann Institute of Science in Israel, the gene Orthopedia (Otp) remains active into adulthood, where it plays a significant role in regulating stress responses, metabolism, and behavior.
The gene, Otp, does not deactivate once the brain has matured but instead continues to impact the hormonal systems governing stress and metabolism.
Dr. Jessica McCarthy, a licensed clinical psychologist, explained the function of transcription factors, which are proteins that turn genes on or off. These proteins differentiate cells, aid in growth, and enable cells to adapt to environmental changes, such as shifts in temperature or hormone levels.
Otp is primarily located in the hypothalamus, responsible for maintaining neuroendocrine systems, stress regulation, and metabolic balance. The absence of Otp, particularly during the embryonic stage, is lethal, prompting researchers to investigate its continued role in adult physiology.
Examining Otp’s Role Beyond Development
Traditionally, Otp has been studied for its role in forming the hypothalamus, the brain area managing essential functions like hunger, sleep, reproduction, and stress. Previous research by Professor Gil Levkowitz and Professor Alon Chen demonstrated that a disruption of Otp during early brain development in zebrafish affected their adult stress response.
To explore Otp’s role in adulthood, researchers used mice, employing a genetic tool to switch off Otp in specific brain cells of adult mice, without affecting earlier brain development.
Striking Outcomes from the Study
The findings were notable. Mice with non-functioning Otp exhibited increased corticosterone levels, depression-like behaviors, lower thyroid hormone levels, decreased body temperature, elevated cholesterol, and abnormal fat storage despite normal eating habits and weight.
Otp operates like a switchboard operator, directing signals from the body and environment to the DNA that controls hormonal systems.
The study suggests that evolution has repurposed this genetic mechanism for dual tasks: assisting brain cell specialization in development and managing stress and energy in adulthood. This can lead to opposing effects such as stimulating hunger while promoting energy expenditure, striving to maintain balance.
Insight into Regulatory Systems
Levkowitz highlighted the importance of understanding Otp’s role. It continues to regulate stress response and energy balance throughout an organism’s life. McCarthy emphasized how interconnected regulatory systems are, noting that observable behaviors could be influenced by much more complex brain-body calculations.
She advocates for regular physical examinations and blood work to detect potential physiological issues impacting real-time behavior.
Understanding the continuous role of Otp might offer new avenues for treating stress and metabolic dysfunction through precise regulation rather than outright system shutdown.
Reference: Levkowitz, G., Chen A., et al. (2026). Disruption of the developmental factor Otp in the adult male forebrain reveals its diverse physiological functions. Endocrinology. https://doi.org/10.1210/endocr/bqag029. Contact Newsweek editors on this story: Sirena Bergman and Cristina Diciu.