For families, discovering the gene behind their child’s condition was an important first step. But scientists were now asking a deeper question: how does losing one copy of MEF2C affect the developing brain?
Between 2012 and 2014, several research groups began to uncover the answer. MEF2C produces a transcription factor, a protein that helps control the activity of many other genes. Researchers found that it plays an important role in the development and function of the brain’s communication networks.
In a healthy brain, nerve cells constantly balance signals that excite activity with signals that calm it down. This balance is essential for learning, behaviour, and normal brain function. When MEF2C was disrupted in animal models, researchers found that these networks no longer developed normally, leading to an imbalance in brain activity.
This was an important insight. It suggested that some symptoms of MEF2C syndrome might not arise directly from the missing gene itself, but from changes in the biological pathways and brain circuits that depend on it.
For the first time, scientists could begin moving beyond diagnosis and towards treatment. These studies helped lay the biological foundations for many of the therapeutic approaches being explored today.