A groundbreaking discovery by an international team led by Shinghua Ding at the University of Missouri has revealed a previously unknown genetic disorder affecting motor neurons and muscle control. As reported by MSN.com, the newly identified condition, named Mutation in NAMPT Axonopathy (MINA) syndrome, is caused by a rare mutation in the NAMPT gene—a protein essential for cellular energy production.
What Is MINA Syndrome?
MINA syndrome results from a specific genetic change (c.472G>C, p.P158A) in the NAMPT gene, which impairs the protein’s ability to help cells make and use energy. Although this mutation is present in all cells, it particularly damages motor neurons, the nerve cells responsible for transmitting signals from the brain and spinal cord to muscles. Because these neurons have long fibers and require substantial energy, they are especially vulnerable when NAMPT function is compromised.
As a consequence, affected individuals develop progressive symptoms such as muscle weakness, coordination problems, and foot deformities. Over time, these issues can worsen, sometimes resulting in the need for a wheelchair.
From Discovery to Diagnosis
The discovery of MINA syndrome builds on years of foundational research. In 2017, Ding’s team demonstrated that NAMPT is crucial for healthy neurons, finding that its deficiency in nerve cells leads to paralysis and symptoms reminiscent of ALS. This prior work drew attention from a European medical geneticist, who encountered two patients with unexplained muscle and coordination problems and sought Ding’s expertise.
By studying cells from these patients and using a mouse model, the researchers confirmed that both individuals carried the same NAMPT mutation. Interestingly, while the mice did not show visible symptoms, their nerve cells exhibited the same internal issues as those seen in patient cells. This highlighted the importance of studying human cells directly, as animal models might not always capture the full spectrum of disease manifestations.
Implications and Future Directions
Currently, there is no cure for MINA syndrome, but researchers are actively investigating ways to boost energy levels in affected nerve cells. The identification of MINA syndrome not only advances our understanding of how disruptions in cellular energy metabolism impact nerve health, but also provides a path toward improved diagnosis and, potentially, new treatments for patients with unexplained neuromuscular symptoms.
“This shows why studying patient cells is so important,” said Ding. “Animal models can point us in the right direction, but human cells reveal what’s really happening in people.”
The study, published in Science Advances, is a significant step forward in rare disease research. It underscores how fundamental scientific discoveries can quickly translate to meaningful clinical insights, offering hope for affected patients and their families. As research continues, the focus will be on developing therapies that can restore energy production in nerve cells, potentially altering the course of this newly recognized condition.
