Alcohol and nicotine are commonly co-abused substances. Genetic studies have provided evidence that genes influence the responses to both of these drugs independently, but more recently there have been data to suggest that common gene(s) are likely to influence responses to both drugs. There is an abundant amount of animal research providing evidence that neuronal nicotinic acetylcholine receptors, in particular 1422- containing receptors are involved in the behavioral responses to nicotine. Important for this proposal, these receptors have also been implicated in sensitivity to some effects of alcohol. Nicotinic acetylcholine receptors containing the 14 and 22 subunits have been shown to play a key role in regulating dopamine release in brain regions known to be important for underlying responses to abused drugs. This proposal focuses on the role of natural variation in these receptor subunits in alcohol and nicotine behaviors. Two samples will be used to determine if single nucleotide polymorphisms (SNPs) in the genes encoding these subunits influence sensitivity to alcohol and nicotine phenotypes. DNA and phenotypic data that have already been collected from the Colorado Center for Antisocial Drug Dependence (CADD) and the National Youth Survey (NYS) studies will be available for analysis. The candidate will examine the influence of these genes using resequencing and family-based association tests. Furthermore, the SNPs found to be associated with alcohol or nicotine behaviors will be functionally characterized using luciferase-based gene expression assays. Through this project the candidate will achieve her short-term goal of learning human statistical genetics, molecular genetics and bioinformatics tools. To learn these methods the candidate will attend coursework, symposia, workshops and conferences, in addition to having regular meeting with her mentors. All mentors of this project are faculty fellows at the Institute for Behavioral Genetics. This environment is ideal for such training because of the Institute's long history in studying questions related to the genetics of substance abuse in humans and using animal and molecular approaches. This new training will complement the candidate's prior training in mouse behavioral genetics and will be important for the candidate's long-term goal of becoming an independent researcher. With this additional training in human statistical and molecular genetics the candidate hopes to ultimately evaluate translational questions between model organism and human populations.

Public Health Relevance

Alcohol and nicotine are by far the most commonly co-abused substances and there is evidence that common gene(s) may underlie the response to both drugs. The proposed project will increase our knowledge of the genetic influence the responses to these drugs and may be informative for the development of treatment strategies.

Agency
National Institute of Health (NIH)
Institute
National Institute on Alcohol Abuse and Alcoholism (NIAAA)
Type
Research Scientist Development Award - Research & Training (K01)
Project #
5K01AA019447-02
Application #
8322854
Study Section
Health Services Research Review Subcommittee (AA)
Program Officer
Reilly, Matthew
Project Start
2011-08-20
Project End
2016-07-31
Budget Start
2012-08-01
Budget End
2013-07-31
Support Year
2
Fiscal Year
2012
Total Cost
$141,785
Indirect Cost
$10,503
Name
University of Colorado at Boulder
Department
Genetics
Type
Other Domestic Higher Education
DUNS #
007431505
City
Boulder
State
CO
Country
United States
Zip Code
80309
Melroy, Whitney E; Stephens, Sarah H; Sakai, Joseph T et al. (2014) Examination of genetic variation in GABRA2 with conduct disorder and alcohol abuse and dependence in a longitudinal study. Behav Genet 44:356-67
Kamens, H M; Corley, R P; McQueen, M B et al. (2013) Nominal association with CHRNA4 variants and nicotine dependence. Genes Brain Behav 12:297-304