Can Brain Cells Recover Without Repairing Genetic Deletions?

New research shows neurons can recover despite genetic deletions, opening doors to innovative brain health therapies.

Scientists have uncovered a surprising way to help brain cells recover from a disease-causing genetic deletion. Instead of repairing the faulty genes themselves, the approach helps neurons find an alternative path to healthy growth (1^✔ ✔Trusted Source
An antioxidant therapy elicits distinct transcriptome responses in 22q11-deleted upper layer cortical projection neurons

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Researchers at Virginia Tech’s Fralin Biomedical Research Institute have shown that an experimental therapy can restore critical brain connections in a mouse model of 22q11.2 deletion syndrome, one of the strongest known genetic risk factors for schizophrenia.

Their findings, published in Disease Models & Mechanisms, suggest that future treatments for genetic brain disorders may not always need to correct the underlying DNA mutation to improve brain function.

A New Strategy for Treating Genetic Brain Disorders

Most experimental therapies for inherited neurological disorders focus on repairing damaged genes or restoring their normal activity. The Virginia Tech team took a different approach.

Rather than attempting to fix the missing genetic material, researchers targeted the harmful cellular changes triggered by the deletion. Their goal was to help vulnerable neurons continue developing normally, even though the genetic defect remained.

“Our findings suggest that restoring normal gene expression may not always be possible—or even necessary,” said Anthony-Samuel LaMantia, professor at the Fralin Biomedical Research Institute and the study’s corresponding author. According to the researchers, the therapy effectively rerouted brain development by activating a different network of genes capable of supporting healthy neuronal growth.

Why 22q11.2 Deletion Syndrome Matters

The study focused on 22q11.2 deletion syndrome, the second most common genetic deletion disorder worldwide. It affects an estimated one in every 2,000 to 4,000 births and is associated with a wide range of developmental conditions, including schizophrenia, autism spectrum disorder, learning disabilities, and cognitive impairments.

People with the syndrome are born missing a small section of chromosome 22. That seemingly small deletion disrupts numerous biological processes involved in brain development, making it extremely difficult to treat by simply replacing the missing genes.

Oxidative Stress Emerged as the Key Problem

Using genetically engineered mice that mimic the condition, researchers discovered that oxidative stress plays a major role in disrupting normal brain development.

Oxidative stress occurs when harmful oxygen-containing molecules accumulate inside cells, damaging important structures including mitochondria—the energy-producing components of cells. To counter this damage, the team administered N-acetylcysteine (NAC), a well-known antioxidant capable of crossing the blood-brain barrier. Instead of correcting the genetic deletion, NAC reduced oxidative stress and allowed neurons to resume healthier development.

Brain Cells Grew Stronger Connections

The therapy produced several important improvements in developing brain cells. Researchers observed healthier mitochondria, improved dendritic growth, and stronger synaptic connections between neurons.

Dendrites are branch-like extensions that receive signals from neighboring neurons and are essential for communication throughout the brain. Perhaps most importantly, the therapy strengthened the communication network among surviving neurons instead of attempting to replace damaged or missing cells.

LaMantia compared the process to taking an alternate route after a roadblock. “Think of it as a detour around a network of winding roads where several trees have fallen,” he explained. “The detour still gets you to your destination even though the original route remains blocked.”

The Brain Found an Alternate Genetic Pathway

One of the study’s biggest surprises was that the treatment did not restore activity in the genes affected by the deletion. Instead, it activated an entirely different collection of genes that enabled neurons to achieve many of the same developmental outcomes.

This discovery challenges a long-standing assumption in genetic medicine—that therapies must restore the original genetic program to produce meaningful benefits. Instead, the findings suggest that the brain’s gene networks are remarkably adaptable and may compensate for certain genetic defects when given the right biological support.

Better Brain Function and Improved Behavior

The biological improvements translated into measurable functional benefits. Mice receiving the therapy showed stronger communication across brain circuits involved in learning and cognitive flexibility. These neural improvements were accompanied by better performance on behavioral tests dependent on those circuits. Rather than creating new neurons, the treatment improved how existing neurons communicated, resulting in stronger overall brain function.

What the Findings Could Mean for Future Treatments

Although the research remains at the preclinical stage and has only been tested in mice, it offers an important shift in thinking about therapies for inherited neurological disorders. Instead of focusing exclusively on repairing damaged DNA, future treatments may aim to strengthen the brain’s natural ability to reorganize its developmental pathways.

Researchers caution that much more work is needed before the approach can be tested in humans. Clinical trials will be required to determine whether similar benefits can be achieved safely in patients with 22q11.2 deletion syndrome or related neurological conditions.

Still, the findings provide hope that targeting cellular stress and leveraging the brain’s genetic flexibility could eventually lead to therapies for disorders that have long been considered difficult to treat.

As LaMantia noted, gene networks possess a remarkable capacity to adapt. Harnessing that flexibility, rather than attempting to correct every genetic disruption directly, may become an entirely new avenue for treating complex genetic brain disorders.

Reference:

1. An antioxidant therapy elicits distinct transcriptome responses in 22q11-deleted upper layer cortical projection neurons – (https://journals.biologists.com/dmm/article/doi/10.1242/dmm.052786/372016/An-antioxidant-therapy-elicits-distinct)

Source-Medindia