Familial Risks of Tourette Syndrome and Chronic Tic Disorders. A Population-Based Cohort Study

Tic disorders, including Tourette syndrome (TS) and chronic tic disorders (CTDs), are assumed to be strongly familial and heritable. Although gene-searching efforts are well under way, precise estimates of familial risk and heritability are lacking. Previous controlled family studies were small and...

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Vydané v:JAMA psychiatry (Chicago, Ill.) Ročník 72; číslo 8; s. 787
Hlavní autori: Mataix-Cols, David, Isomura, Kayoko, Pérez-Vigil, Ana, Chang, Zheng, Rück, Christian, Larsson, K Johan, Leckman, James F, Serlachius, Eva, Larsson, Henrik, Lichtenstein, Paul
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: United States 01.08.2015
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Abstract Tic disorders, including Tourette syndrome (TS) and chronic tic disorders (CTDs), are assumed to be strongly familial and heritable. Although gene-searching efforts are well under way, precise estimates of familial risk and heritability are lacking. Previous controlled family studies were small and typically conducted within specialist clinics, resulting in potential ascertainment biases. They were also underpowered to disentangle genetic from environmental factors that contribute to the observed familiality. Twin studies have been either very small or based on parent-reported tics in population-based (nonclinical) twin samples. To provide unbiased estimates of familial risk and heritability of tic disorders at the population level. In this population cohort, multigenerational family study, we used a validated algorithm to identify 4826 individuals diagnosed as having TS or CTDs (76.2% male) in the Swedish National Patient Register from January 1, 1969, through December 31, 2009. We studied risks for TS or CTDs in all biological relatives of probands compared with relatives of unaffected individuals (matched on a 1:10 ratio) from the general population. Structural equation modeling was used to estimate the heritability of tic disorders. The risk for tic disorders among relatives of probands with tic disorders increased proportionally to the degree of genetic relatedness. The risks for first-degree relatives (odds ratio [OR], 18.69; 95% CI, 14.53-24.05) were significantly higher than for second-degree relatives (OR, 4.58; 95% CI, 3.22-6.52) and third-degree relatives (OR, 3.07; 95% CI, 2.08-4.51). First-degree relatives at similar genetic distances (eg, parents, siblings, and offspring) had similar risks for tic disorders despite different degrees of shared environment. The risks for full siblings (50% genetic similarity; OR, 17.68; 95% CI, 12.90-24.23) were significantly higher than those for maternal half siblings (25% genetic similarity; OR, 4.41; 95% CI, 2.24-8.67) despite similar environmental exposures. The heritability of tic disorders was estimated to be 0.77 (95% CI, 0.70-0.85). There were no differences in familial risk or heritability between male and female patients. Tic disorders, including TS and CTDs, cluster in families primarily because of genetic factors and appear to be among the most heritable neuropsychiatric conditions.
AbstractList Tic disorders, including Tourette syndrome (TS) and chronic tic disorders (CTDs), are assumed to be strongly familial and heritable. Although gene-searching efforts are well under way, precise estimates of familial risk and heritability are lacking. Previous controlled family studies were small and typically conducted within specialist clinics, resulting in potential ascertainment biases. They were also underpowered to disentangle genetic from environmental factors that contribute to the observed familiality. Twin studies have been either very small or based on parent-reported tics in population-based (nonclinical) twin samples. To provide unbiased estimates of familial risk and heritability of tic disorders at the population level. In this population cohort, multigenerational family study, we used a validated algorithm to identify 4826 individuals diagnosed as having TS or CTDs (76.2% male) in the Swedish National Patient Register from January 1, 1969, through December 31, 2009. We studied risks for TS or CTDs in all biological relatives of probands compared with relatives of unaffected individuals (matched on a 1:10 ratio) from the general population. Structural equation modeling was used to estimate the heritability of tic disorders. The risk for tic disorders among relatives of probands with tic disorders increased proportionally to the degree of genetic relatedness. The risks for first-degree relatives (odds ratio [OR], 18.69; 95% CI, 14.53-24.05) were significantly higher than for second-degree relatives (OR, 4.58; 95% CI, 3.22-6.52) and third-degree relatives (OR, 3.07; 95% CI, 2.08-4.51). First-degree relatives at similar genetic distances (eg, parents, siblings, and offspring) had similar risks for tic disorders despite different degrees of shared environment. The risks for full siblings (50% genetic similarity; OR, 17.68; 95% CI, 12.90-24.23) were significantly higher than those for maternal half siblings (25% genetic similarity; OR, 4.41; 95% CI, 2.24-8.67) despite similar environmental exposures. The heritability of tic disorders was estimated to be 0.77 (95% CI, 0.70-0.85). There were no differences in familial risk or heritability between male and female patients. Tic disorders, including TS and CTDs, cluster in families primarily because of genetic factors and appear to be among the most heritable neuropsychiatric conditions.
Tic disorders, including Tourette syndrome (TS) and chronic tic disorders (CTDs), are assumed to be strongly familial and heritable. Although gene-searching efforts are well under way, precise estimates of familial risk and heritability are lacking. Previous controlled family studies were small and typically conducted within specialist clinics, resulting in potential ascertainment biases. They were also underpowered to disentangle genetic from environmental factors that contribute to the observed familiality. Twin studies have been either very small or based on parent-reported tics in population-based (nonclinical) twin samples.IMPORTANCETic disorders, including Tourette syndrome (TS) and chronic tic disorders (CTDs), are assumed to be strongly familial and heritable. Although gene-searching efforts are well under way, precise estimates of familial risk and heritability are lacking. Previous controlled family studies were small and typically conducted within specialist clinics, resulting in potential ascertainment biases. They were also underpowered to disentangle genetic from environmental factors that contribute to the observed familiality. Twin studies have been either very small or based on parent-reported tics in population-based (nonclinical) twin samples.To provide unbiased estimates of familial risk and heritability of tic disorders at the population level.OBJECTIVETo provide unbiased estimates of familial risk and heritability of tic disorders at the population level.In this population cohort, multigenerational family study, we used a validated algorithm to identify 4826 individuals diagnosed as having TS or CTDs (76.2% male) in the Swedish National Patient Register from January 1, 1969, through December 31, 2009.DESIGN, SETTING, AND PARTICIPANTSIn this population cohort, multigenerational family study, we used a validated algorithm to identify 4826 individuals diagnosed as having TS or CTDs (76.2% male) in the Swedish National Patient Register from January 1, 1969, through December 31, 2009.We studied risks for TS or CTDs in all biological relatives of probands compared with relatives of unaffected individuals (matched on a 1:10 ratio) from the general population. Structural equation modeling was used to estimate the heritability of tic disorders.MAIN OUTCOMES AND MEASURESWe studied risks for TS or CTDs in all biological relatives of probands compared with relatives of unaffected individuals (matched on a 1:10 ratio) from the general population. Structural equation modeling was used to estimate the heritability of tic disorders.The risk for tic disorders among relatives of probands with tic disorders increased proportionally to the degree of genetic relatedness. The risks for first-degree relatives (odds ratio [OR], 18.69; 95% CI, 14.53-24.05) were significantly higher than for second-degree relatives (OR, 4.58; 95% CI, 3.22-6.52) and third-degree relatives (OR, 3.07; 95% CI, 2.08-4.51). First-degree relatives at similar genetic distances (eg, parents, siblings, and offspring) had similar risks for tic disorders despite different degrees of shared environment. The risks for full siblings (50% genetic similarity; OR, 17.68; 95% CI, 12.90-24.23) were significantly higher than those for maternal half siblings (25% genetic similarity; OR, 4.41; 95% CI, 2.24-8.67) despite similar environmental exposures. The heritability of tic disorders was estimated to be 0.77 (95% CI, 0.70-0.85). There were no differences in familial risk or heritability between male and female patients.RESULTSThe risk for tic disorders among relatives of probands with tic disorders increased proportionally to the degree of genetic relatedness. The risks for first-degree relatives (odds ratio [OR], 18.69; 95% CI, 14.53-24.05) were significantly higher than for second-degree relatives (OR, 4.58; 95% CI, 3.22-6.52) and third-degree relatives (OR, 3.07; 95% CI, 2.08-4.51). First-degree relatives at similar genetic distances (eg, parents, siblings, and offspring) had similar risks for tic disorders despite different degrees of shared environment. The risks for full siblings (50% genetic similarity; OR, 17.68; 95% CI, 12.90-24.23) were significantly higher than those for maternal half siblings (25% genetic similarity; OR, 4.41; 95% CI, 2.24-8.67) despite similar environmental exposures. The heritability of tic disorders was estimated to be 0.77 (95% CI, 0.70-0.85). There were no differences in familial risk or heritability between male and female patients.Tic disorders, including TS and CTDs, cluster in families primarily because of genetic factors and appear to be among the most heritable neuropsychiatric conditions.CONCLUSIONS AND RELEVANCETic disorders, including TS and CTDs, cluster in families primarily because of genetic factors and appear to be among the most heritable neuropsychiatric conditions.
Author Leckman, James F
Isomura, Kayoko
Rück, Christian
Mataix-Cols, David
Serlachius, Eva
Larsson, Henrik
Chang, Zheng
Lichtenstein, Paul
Pérez-Vigil, Ana
Larsson, K Johan
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  surname: Mataix-Cols
  fullname: Mataix-Cols, David
  organization: Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
– sequence: 2
  givenname: Kayoko
  surname: Isomura
  fullname: Isomura, Kayoko
  organization: Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
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  givenname: Ana
  surname: Pérez-Vigil
  fullname: Pérez-Vigil, Ana
  organization: Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
– sequence: 4
  givenname: Zheng
  surname: Chang
  fullname: Chang, Zheng
  organization: Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
– sequence: 5
  givenname: Christian
  surname: Rück
  fullname: Rück, Christian
  organization: Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
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  surname: Larsson
  fullname: Larsson, K Johan
  organization: Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
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  givenname: James F
  surname: Leckman
  fullname: Leckman, James F
  organization: Child Study Center, Yale University, New Haven, Connecticut4Department of Psychiatry, Yale University, New Haven, Connecticut5Department of Pediatrics and Psychology, Yale University, New Haven, Connecticut
– sequence: 8
  givenname: Eva
  surname: Serlachius
  fullname: Serlachius, Eva
  organization: Department of Clinical Neuroscience, Karolinska Institutet, Stockholm, Sweden
– sequence: 9
  givenname: Henrik
  surname: Larsson
  fullname: Larsson, Henrik
  organization: Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
– sequence: 10
  givenname: Paul
  surname: Lichtenstein
  fullname: Lichtenstein, Paul
  organization: Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
BackLink https://www.ncbi.nlm.nih.gov/pubmed/26083307$$D View this record in MEDLINE/PubMed
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Snippet Tic disorders, including Tourette syndrome (TS) and chronic tic disorders (CTDs), are assumed to be strongly familial and heritable. Although gene-searching...
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SubjectTerms Child
Cohort Studies
Family - psychology
Family Health - statistics & numerical data
Female
Genetic Predisposition to Disease
Humans
Male
Models, Genetic
Registries
Risk Factors
Sweden
Tic Disorders - genetics
Tourette Syndrome - genetics
Title Familial Risks of Tourette Syndrome and Chronic Tic Disorders. A Population-Based Cohort Study
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