ALDH1B1 rs142427338: What Your Genotype Means
The rs142427338 variant is a rare genetic change located within the ALDH1B1 gene, which plays a role in how the body processes alcohol. Research has investigated this variant for potential links to alcohol-related behavioral outcomes, though current evidence remains limited.
What each genotype means
Typical ALDH1B1 genotype
This is the most common genotype for this variant. It is generally considered the reference or baseline state, and there is no evidence suggesting it alters the function of the ALDH1B1 enzyme compared to the general population.
This is the most frequent genotype observed across global populations.
Heterozygous variant carrier
You carry one copy of the variant allele. Research into the functional impact of this specific variant is limited, and it is currently unclear if this genotype significantly influences alcohol metabolism or stress response pathways.
This genotype is rare, occurring at a low frequency in the general population.
Homozygous variant carrier
You carry two copies of the variant allele. While some ALDH1B1 variants have been studied for their potential role in alcohol metabolism and neuroinflammatory responses, the clinical significance of this specific genotype remains uncertain and requires further scientific investigation.
This genotype is very rare and is observed infrequently across most ancestral groups.
Understanding the Variant and Its Location
The variant rs142427338 is a specific change in the DNA sequence of the ALDH1B1 gene. In genetic terms, this variant is often referred to as Gln378Ter, indicating that it introduces a premature stop codon in the protein sequence. This change is located on chromosome 9. Because it creates a stop signal, it is classified as a loss-of-function variant, meaning it may prevent the cell from producing a full-length, functional version of the ALDH1B1 protein. Geneticists study such variants to understand how they alter biological processes, but because this specific change is rare, it is difficult to draw broad conclusions about its impact on human health or behavior without further large-scale studies.
The Role of the ALDH1B1 Gene
The ALDH1B1 gene provides instructions for making an enzyme called aldehyde dehydrogenase 1 family member B1. This enzyme is primarily found in the mitochondria, the energy-producing centers of our cells. It is a key player in the major oxidative pathway of alcohol metabolism, helping to break down aldehydes—toxic byproducts created when the body processes ethanol. Beyond alcohol metabolism, the ALDH1B1 enzyme is involved in various metabolic processes, including the breakdown of certain carbohydrates. Because it is essential for clearing metabolic byproducts, researchers are interested in how variations in this gene might influence an individual's physiological response to alcohol and, by extension, potential stress-related behavioral outcomes.
Research Associations and Evidence Strength
Scientific research into rs142427338 has primarily focused on its potential association with alcohol dependence. Some studies have looked at whether the presence of the rare allele is more common in individuals with alcohol-related problems compared to control groups. However, the evidence is currently considered limited. For instance, one study noted that while the frequency of the variant was higher in certain cases, the rarity of the SNP made it difficult to achieve statistical power, meaning the results could be due to chance. It is important to recognize that genetic associations are not diagnostic. Having a specific genotype does not guarantee a particular behavioral outcome, as alcohol-related health is influenced by a complex interplay of genetics, environment, and lifestyle factors.
Population Frequency
The rs142427338 variant is classified as rare in the general population. Because it occurs at such low frequencies, it is not typically found in the majority of individuals. Population databases like gnomAD are essential for researchers to track these frequencies across different ancestral groups, helping to distinguish rare variants from common ones. If you are interested in your own genetic data, it is important to remember that rare variants often require specialized testing and interpretation by a qualified professional.
Navigating Genetic Information
If you have received information about your genotype for rs142427338, it is important to approach it with perspective. This variant is a subject of ongoing scientific inquiry rather than a clinical tool for diagnosis. You cannot use this information to predict your future health or behavior, nor should it be used to make medical decisions. If you have concerns about alcohol metabolism, stress, or any other health-related issues, the best course of action is to consult with a healthcare provider or a genetic counselor. They can help you interpret your health history in the context of your overall well-being. Never change your lifestyle or medical habits based on a single genetic variant without professional guidance.
How common is this variant?
The rs142427338 variant is rare across most global populations, appearing at very low frequencies in standard reference databases.
Frequently asked questions
What does it mean if I have the rs142427338 variant?
Having this variant means you carry a genetic change that may affect the function of the ALDH1B1 enzyme. However, because the evidence linking this to specific health outcomes is limited, it does not provide a clear medical diagnosis or prediction.
Is rs142427338 a cause of alcohol dependence?
No, this variant is not considered a direct cause of alcohol dependence. While researchers have studied it for potential associations, alcohol dependence is a complex condition influenced by many genetic and environmental factors.
Should I be worried about my ALDH1B1 genotype?
There is no reason for concern based on this variant alone. Genetic variants are common, and most do not have a significant impact on daily health.
Can I use this information to change my diet or medication?
No. You should never make changes to your diet, lifestyle, or medications based on a single genetic variant. Always discuss any health concerns or potential changes with your doctor or pharmacist.
Sources & further reading
Educational information only, last refreshed 9/27/2026. Not medical advice — these associations describe population statistics, not individual predictions.
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