02/21/2026
📌Wanted to share the newest study released by Zovany’s geneticist and many other scientists who are studying their rare neurodegenerative disease!
👉Read here: https://rdcu.be/e3QsP
Here is a layman’s breakdown of the paper:
1. Background: What is Bryant‑Li‑Bhoj Syndrome (BLBS)?
• BLBS is a rare genetic brain disorder.
• People with it often have:
• Severe developmental delays (learning, walking, talking).
• Behavioral differences.
• Cause: Mutations in H3-3A or H3-3B genes, which make the protein histone H3.3.
• Histones are like spools for DNA; they help pack DNA neatly and control which genes are active.
• If histones don’t work properly, brain cells can’t develop normally.
Why this matters: Until now, scientists knew the mutation caused problems, but they didn’t know exactly how it messed up brain development. This study tries to figure that out.
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2. What the researchers did
Goal: Understand how the H3-3B mutation (L48R) affects human neurons.
Steps they took:
1. Made human stem cells into neurons
• Used induced pluripotent stem cells (iPSCs), which can become any cell type.
• They made:
• Normal neurons (control group)
• Mutant neurons with the BLBS mutation (L48R in H3-3B)
2. Checked the genes and DNA packaging
• Measured which genes were turned on/off in normal vs mutant cells.
• Looked at chromatin accessibility → basically how tightly or loosely DNA is wrapped.
3. Grew 3D “mini-brains” (organoids)
• To see how neurons organize in a more realistic brain-like structure.
• Tracked how many cells matured into neurons vs stayed immature.
4. Tested neuron activity
• Measured electrical signals to see if neurons could communicate properly.
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3. Key findings
A. DNA and gene regulation changes
• The mutation caused too much H3.3 protein.
• This disturbed DNA packaging, changing how genes are turned on/off.
• Genes important for neuron growth and communication were most affected.
• Result: neurons couldn’t develop or function properly.
B. Brain cell development
• In 3D mini-brains:
• More immature cells than normal.
• Fewer mature neurons, meaning the brain-like structures didn’t fully develop.
• Suggests that in real patients, this mutation could explain why their brain development is delayed.
C. Neuron activity
• Mutant neurons fired weaker electrical signals.
• This means neurons are less able to communicate, which is likely tied to the cognitive and behavioral symptoms seen in BLBS.
D. Broader implications
• Shows that one single mutation can ripple through the whole gene network, causing brain development problems.
• Confirms that histone H3.3 is crucial for neuron maturation.
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4. Why this study is important
1. Mechanism explained
• Before, we knew the mutation caused BLBS but didn’t know how.
• Now we know it affects:
• DNA packaging
• Gene activity
• Neuron maturation
• Neuron electrical signaling
2. Potential treatment insights
• Understanding this gives clues for possible interventions in the future.
• Scientists could aim to:
• Reduce excess H3.3 protein
• Fix gene activity patterns
• Encourage neurons to mature properly
3. Research platform for rare disorders
• Using iPSCs and mini-brains is a model for studying rare genetic brain disorders.
• It can be applied to other conditions where neuron development is affected.
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5. In simple metaphor terms
Think of DNA like a giant instruction manual:
• Histone H3.3 = the binder clips keeping pages organized.
• Mutation = clips are too tight or in the wrong place → some instructions get ignored or misread.
• Result = brain cells don’t grow right, and signals between neurons don’t flow properly.
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6. Limitations / what we still don’t know
• Study done in cells in a dish, not real human brains.
• Mini-brains are simplified models, so may not capture everything happening in patients.
• Still need animal studies or patient data to see if potential therapies could work.
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✅ Bottom line
• BLBS mutation in H3-3B causes:
• Abnormal DNA packaging
• Misregulated genes for neuron development
• Fewer mature neurons and weak neuronal communication
• This explains why people with BLBS have developmental delays.
• Opens the door for future treatments targeting gene regulation and neuron maturation.
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Here is a visual diagram/flowchart showing step by step what happens from mutation → messed up DNA → immature neurons → weak brain signaling → BLBS symptoms.
Wow - when it rains it pours, more good news to share with the community. We just found out we're going to receive $400,000 to test two different strategies we've developed to treat BLBS! One approach is faster and easier, but more risky (no one's tried anything like it before), and the other is more complicated but more standard. We're going to test both at the same time to make sure we can get the most safe drug to the most people as soon as possible! I'll send everyone updates on the results as we get them - so excited to keep this going!
