Uncover a groundbreaking discovery: Scientists have identified the Gpr45 gene as a key regulator of food intake. This critical finding, made by researchers at UT Southwestern, highlights how Gpr45 influences appetite control via brain cilia, potentially revolutionizing anti-obesity strategies. The research reveals a previously unknown pathway, creating new avenues for weight-loss treatments and offering insights into the complex interplay between genetics and overeating. By pinpointing the role of GPR45 in transporting a protein that activates appetite regulation, the study suggests novel targets for fighting obesity. This could lead to new medications to manage appetite. News Directory 3 is following this research closely. Discover what’s next in the fight against obesity and the potential of these innovative treatments.
Gpr45 Gene Discovery Links Brain Cilia to overeating, Obesity
Updated June 7, 2025
Scientists at UT Southwestern Medical Center have pinpointed a gene, Gpr45, that appears crucial in regulating food intake and body weight. The discovery, made using Automated meiotic Mapping (AMM), offers potential new avenues for combating obesity, a widespread health issue affecting millions.
Zhao Zhang, assistant professor at UT Southwestern, noted that the research reveals a previously unknown signaling pathway within brain neurons’ cilia, playing a vital role in appetite control.this finding could lead to novel treatments for obesity, addressing a condition that impacts roughly 40% of adults in the U.S.
With the rise of effective weight-loss drugs impacting the health care industry, this research identifies new targets that could be used independently or alongside existing medications to manage appetite. The study highlights the complex interplay between genetics and environmental factors in influencing body weight.
To understand the genetics of obesity, Zhang’s team employed forward genetics, enhanced by AMM. This approach,developed by Nobel Laureate Bruce Beutler,involves inducing genetic mutations in mice,screening for specific traits,and rapidly identifying the causative mutation through advanced computational analysis.
The team identified two mutations in the Gpr45 gene that caused obesity in mice, even on a standard diet. Deleting Gpr45 in healthy mouse embryos using CRISPR gene-editing confirmed the gene’s role in body weight regulation. The mice with Gpr45 mutations exhibited critically important overeating, leading to unhealthy weight gain starting around six weeks of age.
Further investigation revealed that GPR45, the protein produced by the Gpr45 gene, is active in hypothalamic neurons, specifically within primary cilia. These cellular extensions also contain proteins from othre appetite-regulating genes, such as MC4R.
The team discovered that GPR45 acts as a transporter, moving a protein called Gαs into primary cilia, where it activates MC4R to control appetite. The identified mutations hinder this process, leaving MC4R inactive and prompting overeating.
“This research uncovers a previously unknown signaling pathway in tiny, antenna-like structures on brain neurons that plays a critical role in controlling appetite, opening new doors for anti-obesity treatments,” said Zhao Zhang, Ph.D., Assistant Professor in the Center for the Genetics of Host Defence and of Internal Medicine at UT Southwestern.
What’s next
Zhang suggests that developing drugs to enhance GPR45 activity could provide a new strategy for fighting obesity,offering an choice to existing treatments that target MC4R but have limited applications due to side effects.
