CYP1A2 A gene for caffeine metabolism Caffeine has been used by athletes for a long time as a performance-enhancing drug. Identification of this tendency will help in moderating coffee consumption, taking into account the individual's caffeine metabolism status. Caffeine is metabolized by an enzyme in the liver that is encoded for by the CYP1A2 gene. Supplementing with. The positive effects of coffee include lowering a feeling of tiredness and increasing alertness; however, it can also narrow the blood vessels. Exons 2–6 are highly conserved among the human, mouse, and rat. Your caffeine levels peak about 1-hour after consumption and then start to decrease gradually. Cortisol is a stress-related hormone and plays a role in protecting the body from stress, as well as reducing inflammation. CYP1A2 and cardiovascular health There seems to be a link between CYP1A2, the incidence of myocardial infarction (MI), and coffee intake. The enzyme produced by this gene is responsible for about 95% of all caffeine metabolisation in your body. Variations in the CYP1A2 gene have a big impact on how caffeine affects our bodies. This is why we include CYP1A2 in our caffeine report. It also plays a role in phase-1 detoxification, particularly in how well your body deals with HCAs and PAHs found in charred meats. The effects of excessive caffeine intake (more than 4-5 cups of strong tea or coffee) include: Excessive caffeine consumption does come with a set of undesirable effects. This suggests that the intake of caffeine has some role in this association. Studies have shown that a genetic polymorphism in the CYP1A2 gene can affect the rate at which caffeine is metabolized in the liver. What is CYP1A2, aka the caffeine gene? Caffeine stimulates the production of stomach acid and can cause heartburn, acid reflux, or stomach upset. There seems to be a link between CYP1A2, the incidence of myocardial infarction (MI), and coffee intake. Yet another study associated DNA damage due to mutagens found in tobacco smoking could contribute to MI. This has a direct consequence on blood pressure, as well as fluid retention in the body. Coffee is a major source of caffeine, which is metabolized by the polymorphic CYP1A2 enzyme. It is a common ingredient in medications that are meant to treat drowsiness, migraines, and headaches. The enzyme efficiency varies between individuals. A significant protective effect of coffee cancer. Caffeine intake increases adrenaline production. In non-smokers, CYP1A2 variants (having either a CC, AC, or AA genotype) were associated with hypertension. The gene codes for the CYP1A2 enzyme, which plays a role in both coffee and oestrogen metabolism. This explains why some people can drink more coffee or tea than others. Many studies, as noted above, seem to link the activity of this gene to caffeine intake. Women with the A/A genotype who have a high caffeine intake have previously been shown to have a higher ratio of certain types of oestrogens, which is thought to be protective against breast cancer. To … But for people who were still smoking, the same gene expressed an association with increased blood pressure. Urinary epinephrine was higher in coffee drinkers than abstainers but only among individuals with slow *1F allele (P = 0.001). Caffeine in limited quantities is beneficial to our health, but in excessive amounts, harmful. Background: Recent genome-wide association studies (GWASs) from populations of European descent identified single nucleotide polymorphisms (SNPs) in aryl-hydrocarbon receptor (AHR) and cytochrome P450 1A1 and 1A2 (CYP1A1-CYP1A2) genes that are associated with habitual caffeine and coffee consumption. People of certain genetic types have a genetic predisposition to drink more cups of coffee. The positive effects of coffee include lowering a feeling of tiredness and increasing alertness; however, it can also narrow the blood vessels. Incidentally, 21-hydroxylase plays a role in the production of cortisol and another hormone named aldosterone. Metabolism of caffeine by the CYP1A2 enzyme shows substantial variation between people, 41, 42 because of both genetic and environmental factors. It is thus interesting to analyze the effect of the variants of the CYP1A2 gene on an individual, based on their caffeine intake. The baseline activity of the enzyme is similar in CYP1A2*1F allele carriers and non-carriers. ... Carriers of the CYP1A2 AA genotype may exhibit an increased total daily coffee intake, … In the same study, CYP1A2 activity had a negative association with blood pressure among ex-smokers. Dr. El-Sohemy suspected that the relationship between coffee and heart disease might also vary from one individual to the next. This occurs typically 12-24 hours after stopping caffeine. Caffeine does not accumulate in our body, but is broken down in the liver. Coffee, CYP1A2 Genotype, and Risk of Myocardial Infarction. However, rs762551(A) ... [PMID 22648710] CYP1A2 and coffee intake and the modifying effect of sex, age, and … The association between coffee intake and risk of myocardial infarction (MI) remains controversial [1, 2]. A study conducted on 553 individuals found that people with this genotype had a 70% reduction in the risk of a heart attack on increased consumption of caffeine. The study was funded by The Swedish Research Council and several oth The gene also plays a role in regulating an infant’s weight during the pregnancy of a woman, and this has a link with caffeine intake. CYP1A2 polymorphisms are associated with lung cancer and bladder cancer risk in Caucasians. Caffeine offers a range of benefits from something as small as over an afternoon slump to reducing the risk of some serious health conditions like heart diseases. Studies have shown that taking caffeine before exercise improves performance. coffee consumption increases the risk of impaired fasting glucose in hypertension particularly among carriers of the slow CYP1A2 *1F allele. 43 There is some evidence, although not genome-wide significant, that polymorphisms in the gene are known to moderate the association between coffee consumption and hypertension 44 and myocardial infarction, 11 as well as the risk of breast cancer in … rs762551, also known as -164A>C or -163C>A, is a SNP encoding the CYP1A2*1F allele of the CYP1A2 gene. Aldosterone, also known as the salt-retaining hormone, regulates the amount of salt retained in the kidneys. Some individuals have a mutation in this locus and thus have the AC genotype. Some people are genetically predisposed to produce very little of CYP1A2 enzyme while others may generate a sufficient amount. Resting metabolic rate describes the rate at which you burn calories at rest. Another is the AHR gene, which controls when and how the CYP1A2 gene is switched on and off (2). A study aimed to tie these concepts together to find the relationship between this gene and blood pressure (BP). ... Coffee intake, glucose … A little caffeine during pregnancy appears to be safe in most cases. The caffeine you ingest passes through the stomach and small intestine, entering the bloodstream in a little as 15 minutes. Fast metabolizers of caffeine may have a high caffeine tolerance. Nutrition, Fitness, Health, Allergy, Skin, Nutrition, Fitness, Health, Allergy, Skin, Precision Medicine, MTHFR, Nutrition, Fitness, Health, Allergy, Skin, Precision Medicine, MTHFR, Carrier Status, and Traits & Personality, © Copyright 2010-20 - Xcode Life - All Rights Reserved. Over 95% of caffeine is metabolized by the CYP1A2 enzyme, which is encoded by the CYP1A2gene, and is involved in the demethylation of caffeine into the primary metabolites paraxanthine, theophylline, and theobromine (21). The gene, known as CYP1A2, is also used by genetic testing firms to predict a person's risk of nonfatal heart attack. In the body, CYP1A2 accounts for around 95% of caffeine metabolism. The CYP1A2 gene breaks down caffeine, several major prescription drugs, and interacts with smoking. The human CYP1A2 gene is located on chromosome 15 and contains seven exons. The primary purpose of it is to act as a toxin to defend the plants against herbivores. Smokers exhibit increased activity of this enzyme. Initially, the increase in metabolism upon caffeine consumption can be evident. The large variability of CYP1A2 activity influences the clearance of caffeine and may be affected by factors such as gender, race, genetic polymorphisms, disease, and exposure to inducers 16,17,19. Muscle twitching is often a visible symptom of excess caffeine consumption. Coffee is the primary source of caffeine for Americans. Anything exceeding that can be harmful to the body. This article explains the wide-ranging effects of this gene, caffeine intake, cardiovascular health, hypertension, and even pregnancy! CYP1A2 codes for the production of 21-hydroxylase, which is part of the cytochrome P450 family of enzymes. ... approximately two cups of … Individuals who are homozygous for the CYP1A2*1A allele are “rapid” caffeine metabolizers, whereas carriers of the variant CYP1A2*1F are “slow” caffeine metabolizers. Upload your DNA raw data to Xcode Life. ... it depends on what substance you are breaking down. This means that caffeine intake plays some role in protecting non-smokers from hypertension, by inducing CYP1A2. The cytochrome P450 enzymes are monooxygenases, which catalyse many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. CC, AC = CYP1A2*1C = Slow Metabolizer. For these “slow metabolizers,” drinking coffee: Reduced calcium levels in the body can lead to osteoporosis. Dr Helena Jernström and colleagues from Lund University and Malmo University in Sweden, carried out this research. A variant at the CYP1A2 gene can determine whether an individual is a fast or slow metabolizer of caffeine, and this has some effect on the blood pressure and cardiovascular health of an individual. Also known as -164A>C or -163C>A, is a SNP encoding the CYP1A2*1F allele of the CYP1A2 gene. This also means that there is some intermediary substrate that the CYP1A2 gene decomposes, and if this gene has a mutation, it could lead to a higher risk of MI. Nutrition, Fitness, Health, Allergy, Skin, Nutrition, Fitness, Health, Allergy, Skin, Precision Medicine, MTHFR, Nutrition, Fitness, Health, Allergy, Skin, Precision Medicine, MTHFR, Carrier Status, and Traits & Personality, © Copyright 2010-20 - Xcode Life - All Rights Reserved, Caffeine: The Buzz May Be In Your CYP1A2 Gene, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3346273/, Morning Person or a Night Owl: How Genes Influence Your Circadian Rhythm, How Genes Influence Caffeine-induced Insomnia, How Genes Influence The Risk Of Obstructive Sleep Apnea, How Genes Influence Excessive Daytime Sleepiness, Two sets of CYP1A2*1F 1.5x fast metabolizers of caffeine, One set of CYP1A2*1F normal metabolism of caffeine, It can cause restlessness in unborn babies and hyperactivity in kids, High caffeine levels directly affect Vitamin C levels in the blood. CYP1A2 is an enzyme responsible for the metabolism of caffeine and some drugs. Genetic tests can help identify such parameters. They found a group of ‘highly inducible’ subjects that had a CYP1A2*1A/*1A genotype. Therefore, you may be a fast or slow caffeine metabolizer based on your CYP1A2 genetics. remains controversial. Coffee is a major source of caffeine, which is metabolized by the polymorphic cytochrome P450 1A2 (CYP1A2) enzyme. This website uses cookies to ensure you get the best experience on our website. It can increase the fetus's heart rate and, in some cases, may even lead to a miscarriage. Our Gene Nutrition Report analyses caffeine sensitivity and metabolism, gluten sensitivity, lactose intolerance, vitamin needs, and 33 more such categories. Smoking is capable of inducing the CYP1A2 enzyme. AA = CYP1A2*1F = Fast Metabolizer. The ability to produce this enzyme is coded for by the CYP1A2-gene. Coffee is a major source of caffeine, which is metabolized by the polymorphic cytochrome P450 1A2 (CYP1A2) enzyme. rs2472297 is a SNP located between the CYP1A1 and CYP1A2 genes on ch 15q24.. A meta-analysis of four GWAS studies of coffee consumption among a total of ~8,000 coffee drinkers of European ancestry found that the rs2472297(T) was strongly associated with increased consumption (p = 5.4 x 10e-14). The pharmacologic effect of these variants remains to be proven with experimental studies. Some common food sources of caffeine include: Up to 400 milligrams of caffeine appears to be safe for most healthy adults. The liver enzymes responsible for metabolising caffeine are called cytochrome P450 enzymes. The activity of CYP1A2 can be influenced by factors such as sex, age, and smoking. In conclusion, there are a lot of effects that the CYP1A2 gene has on the body. However, it is important to note that caffeine can cross the placental barrier, and therefore, can affect the fetus. 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