Fine Mapping Of The ADH Region For Alcohol Metabolism, Use And Dependence
Funder
National Health and Medical Research Council
Funding Amount
$215,690.00
Summary
It is widely known that alcohol use and alcohol dependence can cause many social problems and morbidity. We know that social and and cultural factors can affect the possibility of becoming alcohol dependent. We also know that inheritance plays a major role in the risk of becoming dependent upon alcohol. Two inherited causes or genes have already been identified as causing some people to avoid alcohol and so have less chance of becoming dependent upon it. Clues as to why this happens come from wh ....It is widely known that alcohol use and alcohol dependence can cause many social problems and morbidity. We know that social and and cultural factors can affect the possibility of becoming alcohol dependent. We also know that inheritance plays a major role in the risk of becoming dependent upon alcohol. Two inherited causes or genes have already been identified as causing some people to avoid alcohol and so have less chance of becoming dependent upon it. Clues as to why this happens come from what happens to alcohol following a drink. The body detoxifies itself of alcohol in the liver. There it is converted to very highly toxic acetaldehyde and this is normally rapidly removed by a protein called aldehyde dehydrogenase. Some people do not have a normally functioning form of this protein and cannot remove the acetaldehyde from their bodies. They suffer unpleasant side effects such as nausea, facial flushing and sickness. Consequently they learn by experience to avoid alcohol use and are less likely to develop dependence. We now know that even people with a normally inherited form of aldehyde dehydrogenase can have a lowered risk of dependence. The rate at which our livers convert alcohol to actetaldehyde is also a key factor. Those who are inherently quick at this process again learn to avoid alcohol, others are more at risk. The hypothesis will be tested with a unique set of twins who have provided us with detailed information on how quickly they detoxify alcohol and of their drinking habits for over 20 years. Collectively they will enable us to determine if there is a major genetic influence on alcohol use and dependence that is caused by inter-individual differences in a gene for alcohol metabolism. The DNA of these twins will be used to locate mutations that we predict have a common effect upon our measures of alcohol detoxification, drinking habits and risk of alcoholism.Read moreRead less
A Genome Wide Association Study For Alcohol And Nicotine Addiction Susceptibility Genes
Funder
National Health and Medical Research Council
Funding Amount
$872,816.00
Summary
Alcohol and nicotine addiction are major public health problems within Australia. As well as the personal and economic costs associated with dependence, there is a wide range of downstream health effects from heavy drinking and smoking. This is a proposal for a genome wide association study to systematically screen and identify genetic variants within the Australian population that affects an individual's liability to developing alcohol addiction, nicotine addiction or both.
Genetic And Environmental Determinants Of Tobacco And Alcohol Use Trajectories Into Adulthood:a Prospective Twin Study.
Funder
National Health and Medical Research Council
Funding Amount
$172,875.00
Summary
Problems associated with the long-term use of tobacco and the abuse of alcohol permeate society. The development of effective programs for both the prevention and cessation of tobacco use and alcohol abuse requires an understanding of the natural history of the use of these substances. Most studies of the natural history of tobacco and alcohol use have followed individuals through secondary school and into the early 20s. These studies tell us about the psychosocial influences on these behaviours ....Problems associated with the long-term use of tobacco and the abuse of alcohol permeate society. The development of effective programs for both the prevention and cessation of tobacco use and alcohol abuse requires an understanding of the natural history of the use of these substances. Most studies of the natural history of tobacco and alcohol use have followed individuals through secondary school and into the early 20s. These studies tell us about the psychosocial influences on these behaviours but not about the role of genes on initiation and escalation of substance use. Yet recent advances in the neurophysiology of nicotine and alcohol receptivity and molecular genetics research suggest that genes play at least some role in determining the use of alcohol and tobacco. This proposal is for funding to continue a study designed to investigate the natural histories of alcohol and tobacco use among a sample of 1400 young Australian twins from adolescence to adulthood (early 30s). The study involves a telephone survey of these twins about their smoking and drinking behaviours, and among other things, their attitudes about smoking and drinking, the use of tobacco and alcohol by family and friends and presence of smoking bans at home and work. Because this study explicitly examines the influence of social and psychological factors on tobacco and alcohol use we will be able to determine the relative contribution of genes and psychosocial factors in tobacco and alcohol use. The proposed study is unique in its use of twins, its longitudinal design and its integration of genetics into psychosocial models of behaviour. The results of this study will help to clarify the role of genes in the development of tobacco use and alcohol abuse. Importantly the results of this study will help to identify those social and psychological factors that increase the likelihood of a genetically susceptible individual becoming dependent on nicotine and-or abusing alcohol.Read moreRead less