Genome-wide significant loci for addiction and anxiety

Area of Science:

• Genetics
• Psychiatry
• Behavioral Science

Background:

• Addictive disorders frequently co-occur with psychiatric conditions, particularly anxiety disorders.
• The genetic basis of these comorbid conditions is not well understood.
• Identifying shared genetic factors could illuminate the underlying causes of addiction and anxiety.

Purpose of the Study:

• To investigate the genetic architecture of comorbid addictive and anxiety disorders.
• To identify specific genes and chromosomal regions associated with these traits.
• To understand the shared genetic underpinnings of addiction and anxiety.

Main Methods:

• Analysis of 1284 Mexican-Americans from extended pedigrees.
• Variance decomposition to assess heritability of addiction and anxiety phenotypes.
• Genome-wide univariate and bivariate linkage scans to localize genetic loci.

Main Results:

• Addiction and anxiety phenotypes were found to be heritable.
• Significant linkage signals for drug dependence and a broad anxiety phenotype were identified.
• Positive genetic correlations between anxiety and addiction subtypes were observed, with significant pleiotropic signals for alcohol and drug dependence-anxiety comorbidity.

Conclusions:

• This study confirms shared genetic factors in addiction and anxiety.
• Genomic loci involved in the etiology of comorbid disorders were identified.
• Specific genes and regions, including TMEM132D and regions associated with rare copy number variations, are implicated in addiction and anxiety genetics.