Future Directions in Alcoholism Research

Genomics and Gene Transfer

Alcohol affects the proces according to which genes direct the synthesis of proteins (i.e., expression). Therefore, patterns of gene expression in the appearance of alcohol can help scientists identify the specific molecular sites of alcohol's actions within the brain. novel technologies can detect and quantify changes in the expression of thousands of gene simultaneously by means of scanning microscopic gene arrays applied to glass or silicon chips an inch or likewise square. However, genes whose activity is altered in the neighborhood of alcohol may either be contributing to alcoholism progression in a continuously ascending gradation or may be reacting to alcohol's nearness This question can be researched through observing the effects of manipulating the on a level of specific gene products. united way to accomplish this cessation is by means of viruses that have been engineered to expres a specific gene in infected confined apartments This technique has been applied favorably in studying addictive behaviors. It is hinted that patterns of gene expression may become a diagnostic tool, with differen t disease states being characterized at distinct expression profiles. KEY WORDS: gene expression; protein synthesis; genome; virus; mRNA; hippocampus; ventral tegmental area; animal model

Polong or repeated outlook to alcohol can lead to long-term changes in the function of energize cells (i.e., neurons) within the brain. Researchers believe that these changes underlie certain manifestations of addictive behavior, like as tolerance, withdrawal, and the persistent craving for alcohol that appears to work up relapse after prolonged abstinence. The molecular mechanisms underlying these long-term neurological changes largely involve specific brain proteins that play various parts in communication among neurons.

Information encod in a cell's genetic material directs the synthesis of a given protein. Thus, in whole organisms, the coordinated mastery of genes determines an individual's basic constitution Minor variations among genes account for the normal range of inherited differences between individuals in a population. reciprocally major genetic variation may underlie an individual's vulnerability to disease. At its most numerous basic level, a dormant gene may become active in rejoinder to chemical messengers that signal a cell's increased ne for the gene's particular protein effect The genetic information contained in the DNA is transcribed in the cell's nucleus into a form that can be interpreted by dint of the protein-synthesizing components of the solitary abode; squalid called messenger RNA (mRNA). The proces on which a gene changes its activity in directing the synthesis of its specific mRNA and the resulting protein is called expression.

Research indicates that alcohol affects gene expression (Bachtell et al. 1999) Furthermore, the pattern of gene expression in the personality of alcohol provides evidence for scientists to conclude the specific molecular sites of alcohol's action within the brain (Miles 1995) This article focuses forward two new approaches for analyzing gene expression that present to view potential for use in aspects of alcoholism research.

GENE EXPRESSION

Differential Expression

The differential expression approach bring to lights and quantifies alterations in gene expression according to indirectly measuring mRNA levels. Using this approach, Chen and colleagues (1997) studied differential expression in male rats after long-term (14-day) administration of alcohol. The investigators determined the total RNA make easy of specific brain regions. single in kind significant difference detected in the alcohol-exposed rats was a striking elevation of a specific mRNA in the hippocampus that lasted up to 48 hours after withdrawal from alcohol (Chen et al. 1997) The hippocampus is involved in learning and memory and may play a part in alcohol-induced memory blackouts as well as seizures that oftentimes accompany the acute withdrawal syndrome following cessation of heavy drinking. The specific mRNA was determined to play a character in the synthesis of an enzyme crucial to zeal metabolism in mitochondria. Mitochondria are buildings within cells where most of the cell's zeal is produced. Based on these considerations, the eventuates of the experiment of Chen and colleagues supports the idea that alcohol front causes defects in mitochondria that may also play a part in such health consequences as alcohol-induced liver disease.

In a comparison application of mind of human brain tissue obtained place mortem from alcoholics and nonalcoholics, Fan and colleagues (1999) measured horizontals of different types of mRNA obtained from different brain regions. flushs of a specific mRNA were higher in the nucleus accumbens of alcoholic brains compared with nonalcoholic brains. This differentially represented mRNA is known to play a character in the final stages of mitochondrial protein synthesis. The nucleus accumbens is a center of motivation and stres answer and is implicated in the increase of alcoholism. Taken together, these eventuates are consistent with the possibility that alcohol-induced activation of vigor metabolism in the nucleus accumbens plays a part in alcoholism development.