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Exploring genetic and environmental effects in dysphonia: a twin study
Susanna Simberg1, Pekka Santtila, Anna Soveri
1Center of Excellence in Behavior Genetics, Abo Akademi University, 20500 Turku, Finland. susanna.simberg@abo.fi
Summary
Genetic and environmental factors influence dysphonia (voice problems). Environmental influences are key, particularly for those in voice-demanding occupations, though gene-environment interaction was not significant.
Area of Science:
- Genetics
- Environmental Health
- Occupational Health
Background:
- Dysphonia, or voice problems, can significantly impact quality of life.
- Understanding the etiology of dysphonia is crucial for developing effective interventions.
Purpose of the Study:
- To investigate the role of genetic factors in dysphonia.
- To examine the interaction between genetic predispositions and voice-demanding occupations in the development of dysphonia.
Main Methods:
- A Finnish twin study involving 1,728 participants (twins).
- Zygosity determination for monozygotic and dizygotic twin pairs.
- Factor analysis to create a composite dysphonia variable, followed by twin model fitting to assess genetic and environmental influences.
Main Results:
- Individual differences in dysphonia were attributed to 35% genetic effects and 65% nonshared environmental effects; shared environmental effects were 0%.
- A trend suggested that genetic factors were more influential in less voice-demanding occupations, while environmental factors predominated in voice-demanding roles.
- The observed gene-environment interaction did not reach statistical significance.
Conclusions:
- Both genetic and environmental factors contribute to the development of voice problems.
- Environmental factors appear to play a primary role in dysphonia, especially in occupations requiring significant voice use.
- While not statistically significant, the study suggests a potential interplay between genetics and occupational voice demands.
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