Alcoholism and Genetics: The Family Connection Explained

The underlying hypothesis is that drug addiction treatment alcoholics within a family share many risk alleles; therefore, genes containing alleles that increase the risk for alcoholism reside within chromosomal regions that are inherited by most or all alcoholic family members. Unfortunately, however, the chromosomal regions that were identified using this approach often contained hundreds or even thousands of genes, making it very challenging to determine which specific gene(s) contribute to the risk for alcoholism. Family studies have consistently demonstrated that there is a substantialgenetic contribution to alcohol dependence. Over the past two decades, several genesunderlying susceptibility have been identified. Extensive study of the alcoholmetabolizing genes has demonstrated their important role in disease risk. Additionalgenes have been identified that have expanded our understanding of the genes andpathways involved; however, the number of findings to date is modest.

Is alcoholism a mental disease?

Over the past three decades, several technologies have been applied to create such as candidate genes or weak chromosome regions 12. Just as genes can increase the risk of developing AUD, they can also decrease someone’s risk. Slower alcohol metabolism, leading to unpleasant side effects when drinking, can be a protective factor in certain populations against developing AUD. However, when is alcoholism genetic someone has a high tolerance, it can heighten the susceptibility of the disorder. The complex interplay between genes and environment explains why alcoholism can appear to “skip” generations or affect siblings differently, even though they share similar genetic backgrounds.

Is there an Alcoholic Gene?

Like mentioned earlier, genes are estimated to be responsible for about 50 percent of the risk of developing an alcohol use disorder. Research shows genes contribute to approximately half the risk of developing alcohol use disorder. The home environment, particularly during formative years, can significantly influence one’s relationship with alcohol.

Is Alcohol Use Disorder (AUD) the Same Thing as Alcoholism?

Themost common initial approach was linkage analysis, in which markers throughout thegenome were measured to identify chromosomal regions that appeared to segregate withdisease across many families. Linkage studies are relatively robust to populationdifferences in allele frequencies (because they test within-family inheritance), andcan find a signal even if different variants in the same gene or region areresponsible for the risk in different families. The drawback to this approach isthat linkage studies find broad regions of the genome, often containing manyhundreds of genes. In many cases, the initial linkage studies were followed by moredetailed genetic analyses employing single nucleotide polymorphisms (SNPs) that weregenotyped at high density across the linked regions. Some of the genes identifiedthrough this approach have been replicated across a number of studies and appear tobe robust genetic findings. Studies clearly have shown that both genetic and environmental factors contribute to the risk for alcohol dependence, and it is likely that the interplay between these factors is critical for determining the risk for alcohol abuse and dependence.

The Short Answer: Yes, Genetics Play a Role

The acetaldehyde then is metabolized to acetate by the enzyme aldehyde dehydrogenase (ALDH), which also is encoded by several genes existing in different alleles. Certain alleles in the ALDH2 gene, which encodes a key ALDH enzyme, can result in very low activity of the enzyme (denoted by the black arrow with a red line through it), again causing acetaldehyde accumulation and the resulting aversive effects. Rather, in AUD, only about fifty percent of the risk appears to be attributed to our genes. This is relatively small in comparison to schizophrenia, where genetics can explain eighty percent of the disease predisposition. Therefore, as research progresses, consideration must still be made for the environment—the “nurture”—that individuals were raised and live in.

• The eQTL approach has been used to compare gene expression in brain tissue from several rodent lines and strains genetically predisposed to drink alcohol with control tissue from low-drinking animals.
• Patrick has tremendous empathy and compassion for the recovery community, being in recovery himself since 2018.
• Our genes determine our physical traits and, to some extent, our behavioral characteristics.
• At Oar Health, we talk a lot about reward pathways, which the central nervous system governs by controlling dopamine release, a feel-good chemical.
• This has led to groundbreaking insights into why some individuals might experience adverse reactions to alcohol, offering a protective factor against excessive consumption.

Genes That Affect Mental Illness

Binge drinking (5+ drinks in 2 hours for men, 4+ for women) can cause immediate harm. If you or a loved one are struggling with an alcohol use disorder, reach out to us and discuss your unique needs before the addiction claims your life. If there’s a history of alcoholism in the family, you have a higher risk of developing AUD. However, knowing your family history of addiction shouldn’t make you feel hopeless, as if you’re bound to the same fate.

• This means if you have a family history of alcoholism, you may be more predisposed to it.
• Hello, my name is Ben Lemmon, and I’m the Vice President and Clinical Director at Ohio Community Health Recovery Centers.
• They may increase the overall risk by increasing drinking, orreduce risk by reducing drinking.
• Alcohol use disorder (AUD) is a diagnosis once referred to as “alcoholism.” It’s a condition characterized by patterns of excessive alcohol misuse despite negative consequences and major distress in important areas of daily function.
• The first step in ethanolmetabolism is oxidation to acetaldehyde, catalyzed primarily by ADHs; there are 7closely related ADHs clustered on chromosome 4 (reviewed in20).

The participants’ DNA was extracted, and 20 selected SNPs within ADH5 and ALDH1A1 were genotyped using the MassARRAY™ system. Alcohol can also directly affect hormone levels in ways that increase cancer risk. Moderate alcohol drinking can both elevate estrogen levels and promote further drinking. Alcohol also amplifies breast cancer risk by reducing levels of vitamin A, a compound that regulates estrogen. Alcohol metabolism is the process by which the body breaks down and eliminates alcohol. When alcohol breaks down, its first byproduct is acetaldehyde, a chemical that is itself classified as a carcinogen.

Alcoholism and Genetics: The Family Connection Explained

Patrick McCamley (Clinical Therapist) is a Cincinnati native who has worked in substance use disorder/co-occurring mental health disorder treatment since 2019. Patrick received his bachelors degree in psychology from University of Cincinnati in 2021 and received his LCDC III (Licensed Chemical Dependency Counselor) license from the Ohio Chemical Dependency Professionals Board in 2022. Patrick has worked in Clinical Operations, Clinical Case Management, and Clinical Therapy throughout his career.

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