Abstract:
OBJECTIVE:The role of the human serotonin transporter protein (5-HTT) gene in psychiatric disorders suggests that its variation may influence the comorbidity pattern and the heterogeneity of alcoholism. The aim of the present study is to verify possible associations between the 5-HTTLPR control region polymorphism with alcoholism and comorbid disorders. METHODS:The polymorphic site was genotyped in 114 patients with alcohol dependence and 218 controls, all of them Brazilians of European descent. A comprehensive diagnostic interview identified the comorbid disorders. RESULTS:Study participants with alcohol dependence and controls did not differ in the genotype and allele frequencies (genotypes: chi(2) = 2.52, P = 0.28; alleles: chi(2) = 0.37; P = 0.54). Patients with comorbid major depressive disorder (chi(2) = 6.14, P = 0.01), drug abuse (chi(2) = 6.82, P = 0.01) and nicotine dependence (chi(2) = 4.10, P = 0.04), however, presented a higher frequency of the S allele than patients without these comorbidities. Patients with comorbid depression and drug abuse also presented a higher frequency of the S allele than controls. CONCLUSIONS:The present results are consistent with the importance of the 5-HTT gene in psychiatry. They suggest a role of the 5-HTTLPR polymorphism in a group of comorbid disorders among alcohol-dependent individuals, supporting a genetic influence in alcoholism heterogeneity.
journal_name
Psychiatr Genetjournal_title
Psychiatric geneticsauthors
Marques FZ,Hutz MH,Bau CHdoi
10.1097/01.ypg.0000199449.07786.7dsubject
Has Abstractpub_date
2006-06-01 00:00:00pages
125-31issue
3eissn
0955-8829issn
1473-5873pii
00041444-200606000-00007journal_volume
16pub_type
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