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Tic symptom dimensions and their heritabilities in Tourette’s syndrome

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Introduction

Gilles de la Tourette’s syndrome (TS) is both genotypically and phenotypically heterogeneous. Gene-finding strategies have had limited success, possibly because of symptom heterogeneity.

Objective

This study aimed at specifically investigating heritabilities of tic symptom factors in a relatively large sample of TS patients and family members.

Participants and methods

Lifetime tic symptom data were collected in 494 diagnosed individuals in two cohorts of TS patients from the USA (n=273) and the Netherlands (n=221), and in 351 Dutch family members. Item-level factor analysis, using a tetrachoric correlation matrix in SAS (v9.2), was carried out on 23 tic symptoms from the Yale Global Tic Severity Scale.

Results

Three factors were identified explaining 49% of the total variance: factor 1, complex vocal tics and obscene behaviour; factor 2, body tics; and factor 3, head/neck tics. Using Sequential Oligogenic Linkage Analysis Routine, moderate heritabilities were found for factor 1 (h2r=0.21) and factor 3 (h2r=0.25). Lower heritability was found for overall tic severity (h2r=0.19). Bivariate analyses indicated no genetic associations between tic factors.

Conclusion

These findings suggest that (i) three tic factors can be discerned with a distinct underlying genetic architecture and that (ii) considering the low tic heritabilities found, only focusing on the narrow-sense TS phenotype and leaving out comorbidities that are part of the broader sense tic phenotype may lead to missing heritability. Although these findings need replication in larger independent samples, they might have consequences for future genetic studies in TS.
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Keywords: Tourette’s syndrome; factor analysis; heritability; heterogeneity; tic symptom factors; tics

Document Type: Research Article

Affiliations: 1: Institut de Neurosciences de la Timone INT, Marseille, France, Institute of Neuroscience INM-6, Research Center Jülich, Jülich, Germany, Department of Psychiatry, VU University Medical Centre VUmc, Amsterdam 2: Psychiatry, Epidemiology & Biostatistics 3: Department of Psychiatry, University of California, San Francisco, USA 4: Department of Clinical & Health Psychology, Utrecht University, Altrecht Academic Anxiety Center, Utrecht, The Netherlands

Publication date: June 1, 2015

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