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Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder
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Alexithymia may explain the genetic relationship between autism and sensory sensitivity
Isabel Yorke1, Jennifer Murphy2, Fruhling Rijsdijk3
1Department of Child and Adolescent Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK.
Translational Psychiatry
|March 5, 2025
Summary
Alexithymia, a condition of difficulty identifying emotions, may explain the genetic link between autism and sensory symptoms. This suggests shared genetic factors between alexithymia and sensory issues, potentially influencing autism presentation.
Area of Science:
- Neurodevelopmental disorders
- Genetics
- Psychiatry
Background:
- Sensory symptoms are common in autism and included in diagnostic criteria.
- A genetic link between autism and sensory symptoms is suggested, but these symptoms are not exclusive to autism.
- Alexithymia, characterized by difficulties in emotion processing, is hypothesized to underlie the shared etiology of sensory symptoms across conditions, including autism.
Purpose of the Study:
- To investigate the genetic association between autism, alexithymia, and sensory symptoms using adolescent twin data.
- To determine if alexithymia mediates the genetic relationship between autism and sensory symptoms.
Main Methods:
- Utilized parent-reported symptom data from adolescent twins.
- Employed genetic correlation analyses to examine the relationships between autism, alexithymia, and sensory symptoms.
- Controlled for alexithymia to assess its influence on the autism-sensory symptom genetic link.
Main Results:
- The direct genetic correlation between autism and sensory symptoms was not significant after accounting for alexithymia.
- A significant genetic correlation was found between alexithymia and sensory symptoms, independent of autism.
- Genetic factors influencing alexithymia and sensory symptoms remained consistent even after controlling for autism.
Conclusions:
- Alexithymia and sensory symptoms share a common genetic basis not explained by their association with autism.
- The observed genetic link between sensory symptoms and autism may be significantly influenced or entirely explained by alexithymia.
- Future research should explore the role of alexithymia in sensory symptoms across a broader range of conditions.
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