Dyslexia Gene Variants Linked to Brain Structure Differences
Genes Linked to Dyslexia Show Distinct Brain Structure Differences in General Population
New research reveals how genes associated with dyslexia influence brain structure, even in individuals without a diagnosis.
Around 5% of school-aged children struggle with dyslexia, a learning disorder that makes reading and spelling challenging. While genetics play a significant role,dyslexia is a complex trait,not caused by a single gene or brain region.
A groundbreaking study published in Science Advances sheds light on this complexity. Led by researchers at the Max Planck Institute for Psycholinguistics, the study examined the link between genes associated with dyslexia and brain structure in a large population of adults.”Dyslexia is partly influenced by genes and is quite heritable,” explains Sourena Soheili-Nezhad, the study’s first author.”Understanding which genes affect which brain networks can definitely help us understand how cognitive functions develop differently in individuals with this learning difficulty.”
Unveiling the Genetic Link
The researchers analyzed data from over a million people provided by 23andMe, identifying numerous genetic variants linked to an increased risk of dyslexia. They then focused on over 30,000 adults from the UK Biobank database, calculating “polygenic scores” for dyslexia based on their genetic makeup.
Even without knowing who had dyslexia in the database, the researchers found that individuals with a higher genetic predisposition to dyslexia showed distinct brain structure differences.
Brain Regions Impacted
The study revealed several key findings:
Lower Volume: Individuals with a higher genetic chance of dyslexia had lower volume in brain areas responsible for movement coordination and processing speech sounds. Increased Volume: Conversely, these individuals showed increased volume in the visual cortex.
* Internal Capsule: Differences were also observed in the internal capsule, a white matter bundle deep within the brain. White matter density in this area was linked not only to dyslexia but also to educational attainment, fluid intelligence, and attention deficit/hyperactivity disorder (ADHD), traits often associated with dyslexia.
Cause or Outcome?
“These results suggest that dyslexia is a complex trait involving a combination of altered cognitive processes,” says clyde Francks, the study’s senior author.
While the study used data from adults, the researchers believe some brain changes likely originate during early development, while others might reflect long-term adaptations to living with dyslexia.
Future research will focus on children and adolescents to better understand which brain changes contribute to dyslexia and which are consequences of the condition.
Implications for the Future
Understanding the brain basis of dyslexia could pave the way for earlier diagnosis and more targeted educational interventions.
“This knowledge could help us develop more personalized strategies to support children with dyslexia,” concludes Soheili-Nezhad.
Decoding Dyslexia: How Genes Shape Brain Structure
New research illuminates the complex link between genes and dyslexia, revealing distinct brain structure differences in the general population, regardless of a diagnosis.
Dyslexia affects approximately 5% of school-aged children, making reading and spelling a challenge. This complex learning disorder is heavily influenced by genetics, but not steadfast by a single gene or brain region.
A groundbreaking study published in Science Advances delves into this complexity, investigating the relationship between genes associated with dyslexia and brain structure in a large adult population.
Lead by researchers at the Max Planck institute for Psycholinguistics, the study analyzed data from over a million individuals from 23andMe, identifying numerous genetic variations linked to an increased risk of dyslexia.
Focusing on over 30,000 adults from the UK Biobank database, they calculated “polygenic scores” for dyslexia based on genetic makeup. Remarkably, even without identifying dyslexia diagnoses, individuals with a higher genetic predisposition showed distinct brain structure differences.
Key Findings:
Lower Volume: Individuals with a higher genetic chance of dyslexia exhibited lower volume in brain areas responsible for movement coordination and processing speech sounds.
Increased Volume: Conversely, these individuals displayed increased volume in the visual cortex.
* Internal capsule Variations: Differences were also observed in the internal capsule, a white matter bundle deep within the brain. White matter density in this area was linked not only to dyslexia but also to educational attainment, fluid intelligence, and attention deficit/hyperactivity disorder (ADHD), traits often associated with dyslexia.
“These results suggest that dyslexia is a complex trait involving a combination of altered cognitive processes,” explains study senior author Clyde Francks.
Even though the study used adult data, researchers believe some brain changes originate during early advancement, while others may reflect long-term adaptations to living with dyslexia.
Future Directions and Implications:
Further research will explore these brain changes in children and adolescents to determine which contribute to dyslexia and which are consequences.
Understanding the brain basis of dyslexia could lead to earlier diagnosis and more targeted educational interventions.
“This knowledge could help us develop more personalized strategies to support children with dyslexia,” concludes study first author Sourena Soheili-Nezhad.