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Looking for stories about how genetics help bridge a missing link when more then one family member has autism.
https://www.ncbi.nlm.nih.gov/books/NBK573616/
https://www.nature.com/articles/s41380-024-02725-z
Key Connections Between Mitochondria and Autism
Energy Deficits: Mitochondria are the cell's "batteries." Dysfunctional mitochondria fail to provide enough energy (ATP) to neurons, which can lead to abnormal brain development and neurological symptoms.
High Metabolic Markers: Research has found elevated levels of lactate, pyruvate, carnitine, and metabolic byproducts in the blood of autistic individuals, indicating dysfunctional oxidative phosphorylation.
High Prevalence: Studies suggest that 30% to 80% of children with autism show some markers of mitochondrial dysfunction.
Autistic Regression: Mitochondrial disease is strongly associated with cases of autistic regression, where a child loses previously acquired skills, often following a metabolic or inflammatory trigger.
Common Symptoms of Dysfunction
Individuals with both ASD and mitochondrial dysfunction frequently experience specific issues:
Unusual developmental plateau or regression.
Gastrointestinal problems.
Seizures or epilepsy.
Severe fatigue and motor delays.
Potential Causes and Factors
Genetic Factors: Both nuclear and mitochondrial DNA (mtDNA) mutations are associated with these deficits.
Environmental Factors: Prenatal exposure to environmental toxins, infections, or severe stress can damage mitochondrial function.
Oxidative Stress: Children with autism often exhibit high levels of oxidative stress, which further damages the mitochondria, creating a vicious cycle of damage.
Clinical Implications
While not all individuals with autism have underlying mitochondrial disease, the connection is strong enough that experts often recommend screening in cases of severe regression or co-occurring neurological/metabolic symptoms. While there is no cure for mitochondrial dysfunction, treatments focused on supporting metabolic function (like vitamin supplementation) are sometimes used to improve outcomes.
How does genetics help explain autism in multiple family members?
Having more than one child with autism is more common than you might think. Research shows that if you already have one child on the spectrum, there's a 15-20% chance of having a second child with autism. In fact, about 25% of families report having more Show Full Answer
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