Genetic and environmental aetiology of the dimensions of Callous-Unemotional traits.
Psychol Med
; 46(2): 405-14, 2016 Jan.
Article
em En
| MEDLINE
| ID: mdl-26456336
ABSTRACT
BACKGROUND:
A Callous-Unemotional trait specifier (termed 'Limited Prosocial Emotions') was added to the diagnosis of conduct disorder in DSM-5. The Inventory of Callous-Unemotional Traits (ICU) is a comprehensive measure of these traits assessing three distinct, yet correlated dimensions--Callousness, Uncaring, and Unemotional--all thought to reflect the general Callous-Unemotional construct. The present study was the first to examine the degree to which the aetiology of these dimensions is shared v. independent.METHOD:
Parent-reported ICU data from 5092 16-year-old twin pairs from the Twins Early Development Study were subjected to confirmatory factor analysis. Multivariate genetic modelling was applied to the best-fitting structure.RESULTS:
A general-specific structure, retaining a general factor and two uncorrelated specific factors (Callousness-Uncaring, Unemotional), provided the best fit to the data. The general factor was substantially heritable (h2 = 0.58, 95% CI 0.51-0.65). Unusually, shared environmental influences were also important in accounting for this general factor (c2 = 0.26, 95% CI 0.22-0.31), in addition to non-shared environmental influences. The Unemotional dimension appeared phenotypically and genetically distinct as shown by the substantial loadings of unemotional items on a separate dimension and a low genetic correlation between Unemotional and Callousness-Uncaring.CONCLUSIONS:
A general factor, indicative of a shared phenotypic structure across the dimensions of the ICU was under substantial common genetic and more modest shared environment influences. Our findings also suggest that the relevance of the Unemotional dimension as part of a comprehensive assessment of CU traits should be investigated further.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Personalidade
/
Gêmeos Dizigóticos
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Gêmeos Monozigóticos
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Transtorno da Conduta
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Transtorno da Personalidade Antissocial
Tipo de estudo:
Prognostic_studies
Limite:
Adolescent
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Female
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Humans
/
Male
País/Região como assunto:
Europa
Idioma:
En
Revista:
Psychol Med
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Canadá