Published in:
Open Access
20-12-2023 | Benign Paroxysmal Positional Vertigo | Editorial
About the Genetic Contribution to Chronic Dizziness and Episodic Vertigo
Author:
Jose A. Lopez-Escamez
Published in:
Journal of the Association for Research in Otolaryngology
|
Issue 6/2023
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Excerpt
When investigating the genetic underpinnings of any particular trait, there are two prime aspects to consider. Firstly, the condition has to demonstrate some degree of heritability, which is the proportion of phenotypic variance explained by genetic factors [
1]. This can be reasonably addressed using genetic epidemiology, including familial aggregation, adoptee, and twin studies [
2]. Secondly, the prevalence of the target phenotype is essential to anticipate the genetic architecture of the condition and identify causal genomic variation. Common disorders, with a prevalence > 5%, have a multiallelic (polygenic) structure with many common variants driving the association, each of them with a small effect size. Conversely, rare disorders are most often associated with few rare variants of large effect size [
3]. …