Linkage scan of alcohol dependence in the UCSF Family Alcoholism Study

• Published in: Drug and alcohol dependence Vol. 113; no. 2; pp. 125 - 132
• Main Authors: Gizer, Ian R, Ehlers, Cindy L, Vieten, Cassandra, Seaton-Smith, Kimberly L, Feiler, Heidi S, Lee, James V, Segall, Samantha K, Gilder, David A, Wilhelmsen, Kirk C
• Format: Journal Article
• Language: English
• Published: Shannon Elsevier Ireland Ltd 15.01.2011; Elsevier
• Subjects: Addiction; Addictive behaviors; Adult and adolescent clinical studies; Alcohol consumption; Alcohol dependence; Alcoholism; Alcoholism - diagnosis; Alcoholism - genetics; Alcoholism and acute alcohol poisoning; Biological and medical sciences; Chromosomes; Diagnostic and Statistical Manual of Mental Disorders; Drug addiction; DSM-IV alcohol dependence; Genetic Linkage; Genetic Predisposition to Disease; Genetic Testing - methods; Genetics; Genome-Wide Association Study; Genotype; Humans; Linkage; Medical sciences; Psychiatry; Psychology. Psychoanalysis. Psychiatry; Psychopathology. Psychiatry; Substance dependence; Symptoms; Toxicology; DSM-IV alcohol dependence; Substance dependence; Linkage; Addiction; Alcoholism; Human; Drug addiction; Family study; Alcoholic beverage; Dependence; Genetic linkage; Genetics; Drug of abuse; Diagnostic and Statistical Manual IV
• ISSN: 0376-8716; 1879-0046
• DOI: 10.1016/j.drugalcdep.2010.07.017

Abstract Ample data suggest that alcohol dependence represents a heritable condition, and several research groups have performed linkage analysis to identify genomic regions influencing this disorder. In the present study, a genome-wide linkage scan for alcohol dependence was conducted in a community sample of 565 probands and 1080 first-degree relatives recruited through the UCSF Family Alcoholism Study. The Semi-Structured Assessment for the Genetics of Alcoholism (SSAGA) was used to derive DSM-IV alcohol dependence diagnoses. Although no loci achieved genome-wide significance (i.e., LOD score > 3.0), several linkage peaks of interest (i.e., LOD score > 1.0) were identified. When the strict DSM-IV alcohol dependence diagnosis requiring the temporal clustering of symptoms served as the phenotype, linkage peaks were identified on chromosomes 1p36.31–p36.22, 2q37.3, 8q24.3, and 18p11.21–p11.2. When the temporal clustering of symptoms was not required, linkage peaks were again identified on chromosomes 1p36.31–p36.22 and 8q24.3 as well as novel loci on chromosomes 1p22.3, 2p24.3–p24.1, 9p24.1–p23, and 22q12.3–q13.1. Follow-up analyses were conducted by performing linkage analysis for the 12 alcohol dependence symptoms assessed by the SSAGA across the support intervals for the observed linkage peaks. These analyses demonstrated that different collections of symptoms often assessing distinct aspects of alcohol dependence (e.g., uncontrollable drinking and withdrawal vs. tolerance and drinking despite health problems) contributed to each linkage peak and often yielded LOD scores exceeding that reported for the alcohol dependence diagnosis. Such findings provide insight into how specific genomic regions may influence distinct aspects of alcohol dependence.