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==== Active Gene-Environment Correlation ====
==== Active Gene-Environment Correlation ====
This occurs when individuals seek out environments that are compatible with their genetic predispositions.<ref name="Jaffee-2008" /> For example, a person with a genetic predisposition for athleticism may be more inclined to choose sports-related activities and environments.<ref>{{Cite journal |last1=Varillas-Delgado |first1=David |last2=Del Coso |first2=Juan |last3=Gutiérrez-Hellín |first3=Jorge |last4=Aguilar-Navarro |first4=Millán |last5=Muñoz |first5=Alejandro |last6=Maestro |first6=Antonio |last7=Morencos |first7=Esther |date=2022-08-01 |title=Genetics and sports performance: the present and future in the identification of talent for sports based on DNA testing |journal=European Journal of Applied Physiology |language=en |volume=122 |issue=8 |pages=1811–1830 |doi=10.1007/s00421-022-04945-z |issn=1439-6327 |pmc=9012664 |pmid=35428907}}</ref>
This occurs when individuals seek out environments that are compatible with their genetic predispositions.<ref name="Jaffee-2008" /> For example, a person with a genetic predisposition for athleticism may be more inclined to choose sports-related activities and environments.<ref>{{Cite journal |last1=Varillas-Delgado |first1=David |last2=Del Coso |first2=Juan |last3=Gutiérrez-Hellín |first3=Jorge |last4=Aguilar-Navarro |first4=Millán |last5=Muñoz |first5=Alejandro |last6=Maestro |first6=Antonio |last7=Morencos |first7=Esther |date=2022-08-01 |title=Genetics and sports performance: the present and future in the identification of talent for sports based on DNA testing |journal=European Journal of Applied Physiology |language=en |volume=122 |issue=8 |pages=1811–1830 |doi=10.1007/s00421-022-04945-z |issn=1439-6327 |pmc=9012664 |pmid=35428907}}</ref>

=== Epigenetics ===
[[Epigenetics]] is one type of gene-environment interplay as it focuses on the changes within a [[Cell (biology)|cell]] as a result of changes within [[gene expression]] without altering the genetic code.<ref>{{Cite journal |last=Waterland |first=Robert A. |date=2006-11-01 |title=Epigenetic mechanisms and gastrointestinal development |url=https://www.sciencedirect.com/science/article/pii/S002234760600624X |journal=The Journal of Pediatrics |series=Nutrition and Gastrointestinal Tract Development and Function |volume=149 |issue=5, Supplement |pages=S137–S142 |doi=10.1016/j.jpeds.2006.06.064 |issn=0022-3476}}</ref> The source of epigenetic changes can be a result of cellular mechanisms or environmental factors. One instance of an environment impacting gene expression is DNA [[methylation]] as a result of smoking during pregnancy. <ref>{{Cite journal |last=Knopik |first=Valerie S. |last2=Maccani |first2=Matthew A. |last3=Francazio |first3=Sarah |last4=McGeary |first4=John E. |date=2012-11 |title=The epigenetics of maternal cigarette smoking during pregnancy and effects on child development |url=https://www.cambridge.org/core/journals/development-and-psychopathology/article/abs/epigenetics-of-maternal-cigarette-smoking-during-pregnancy-and-effects-on-child-development/232CD7778F4A597A5606873645DD94BA |journal=Development and Psychopathology |language=en |volume=24 |issue=4 |pages=1377–1390 |doi=10.1017/S0954579412000776 |issn=0954-5794 |pmc=PMC3581096 |pmid=23062304}}</ref> Another environmental exposure that can trigger epigenetic changes is [[heavy metals]] like [[arsenic]]. This is done through the disturbance of histone [[Histone acetylation and deacetylation|acetylation]] and DNA methylation which is correlated with increased rates of [[cancer]], [[Autoimmune disease|autoimmune diseases]], and [[Neurological disorder|neurological disorders]]. <ref>{{Cite journal |last=Kanherkar |first=Riya R. |last2=Bhatia-Dey |first2=Naina |last3=Csoka |first3=Antonei B. |date=2014-09-09 |title=Epigenetics across the human lifespan |url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4207041/ |journal=Frontiers in Cell and Developmental Biology |volume=2 |pages=49 |doi=10.3389/fcell.2014.00049 |issn=2296-634X |pmc=4207041 |pmid=25364756}}</ref>


== Environmental Factors ==
== Environmental Factors ==

Revision as of 20:58, 24 March 2024

Gene-environment interplay is a term encompassing multiple ways that genes and environments work together to produce a phenotype, or observable trait. Processes classified as examples of gene-environment interplay include gene-environment interaction, gene-environment correlation,[1] and epigenetics, which is the study of the effect of the environment on gene expression.[2] It is often studied with behavioral genetic research designs like twin, family, and adoption studies.[1]

Aim

The aim of studying gene-environment interplay is to discover new mechanisms of disease and to describe the reasons for digression from the expected expression of genes.[3] Studying these interactions allows for the complete understanding of diseases that are inclusive of numerous discrete and interacting cellular processes, including cell signaling.[3] By better understanding the underlying mechanisms of such diseases, interventions can be designed to target individual factors within specific populations that minimize the prevalence of disease.[3]

Types of Gene-Environment Interplay

A flow chart depicting some of the different types of gene-environment interplay
Some of the different types of gene-environment interplay. Adapted from Jaffee and Price, Psychiatry, 2008 [4] and Flowers, Froelicher & Aouizerat, European Journal of Cardiovascular Nursing, 2012 [3]

Gene-Environment Interactions (GxE)

This is the most common form of gene-environment interplay. It occurs when genetic factors and environmental factors interact to produce an outcome that cannot be explained by either factor alone.[5] For example, a study found that individuals carrying the genetic variant 5-HTT (the short copy) were at a higher risk of developing depression when exposed to adverse childhood experiences, whereas those with other genotypes (long copy) were less affected by childhood maltreatment.[6]

Gene-Environment Correlation (rGE)

This occurs when an individual's genotype influences the environments they are exposed to.[4] There are three subtypes of gene-environment correlation:

Passive Gene-Environment Correlation

An individual's childhood environment may be correlated to their inherited genes, since their parents can select the environment that they are exposed to as a child.[4]

Evocative Gene-Environment Correlation

In this case, an individual's genetic traits elicit responses from others in their environment.[4] For instance, a study has found that interpersonal control between a mother and her child, is partially a function of that child’s genetic predisposition toward control.[7]

Active Gene-Environment Correlation

This occurs when individuals seek out environments that are compatible with their genetic predispositions.[4] For example, a person with a genetic predisposition for athleticism may be more inclined to choose sports-related activities and environments.[8]

Epigenetics

Epigenetics is one type of gene-environment interplay as it focuses on the changes within a cell as a result of changes within gene expression without altering the genetic code.[9] The source of epigenetic changes can be a result of cellular mechanisms or environmental factors. One instance of an environment impacting gene expression is DNA methylation as a result of smoking during pregnancy. [10] Another environmental exposure that can trigger epigenetic changes is heavy metals like arsenic. This is done through the disturbance of histone acetylation and DNA methylation which is correlated with increased rates of cancer, autoimmune diseases, and neurological disorders. [11]

Environmental Factors

Pollutants

Epigenetic modifications can affect gene activity without changing the DNA sequence.[12] Decreased DNA methylation, the addition of a methyl group to a cytosine nucleotide on DNA, is thought to be linked to air pollution exposure. The mechanism behind this is not completely understood, but it may involve the formation of reactive oxygen species. These species generate oxidative stress, which simulates a chain reaction of signals in cells.[13] This can lead to hydroxymethylation, which replaces the methyl group with a hydroxyl group. Hydroxymethylation alters gene expression, potentially causing diseases such as lung cancer.[14] This can ultimately lead to inflammation in regions such as the airways, which triggers asthma. Cellular processes can also be activated to increase cytokine expression and immune cells in the same regions.[13] Cytokines are signaling proteins that regulate the immune system and are necessary when the body responds to injury or disease.[15]

Schematic representation of epigenetic histone modifications. Based on Rodriguez-Paredes and Esteller, Nature, 2011

Malnutrition

Nutrition plays a crucial role in shaping gene expression, which can ultimately impact an individual's phenotype. Fetal malnutrition, for example, has been associated with decreased level DNA methylation, particularly on genes like IGF2, which is involved in insulin metabolism. [16] The alteration in DNA methylation patterns can elevate the risk of developing metabolic disorders and type II diabetes mellitus. [17] Furthermore, prenatal malnutrition can lead to differential DNA methylation of genes related to growth, development, and metabolism. These epigenetic changes increase the likelihood of adverse phenotypes such as obesity and high cholesterol later in life. [18] Malnutrition can also significantly impact gene expression in the small intestine, leading to alterations in nutrient transporters, digestive enzymes, barrier function, immune responses, and metabolic adaptation.[19]

Exercise

Physical activity increases telomerase activity, which elongates the ends of chromosomes to maintain chromosomal stability, and induces epigenetic modifications of specific genes.[20] For example, it has been shown to increase methylation of the ASC gene, which generally decreases with age. Methylation can compact a gene, decreasing the amount of protein produced from the gene and the ASC gene stimulates cytokine production. Thus, the expression of inflammatory cytokines decreases.[21] This suppression can help prevent the development of chronic inflammation and associated age-related diseases due to excess inflammatory cytokines.[21] However, these epigenetic modifications depend on the intensity and type of exercise and are reversible with the cessation of physical activity.[22]

Prenatal Environment

The maternal environment can have epigenetic effects on the developing fetus. For instance, alcohol consumed during pregnancy can cross from maternal blood to the placenta and into the fetal environment of the amniotic cavity, where it can induce epigenetic modifications on fetal DNA.[23] Mouse embryo cultures show that alcohol exposure during fetal development can contribute to changes in DNA methylation of genes involved in development, metabolism, and organization of DNA during brain development.[24] These alcohol-induced changes in DNA methylation during pregnancy contribute to the distinct set of traits seen in Fetal Alcohol Spectrum Disorder (FASD).[24] Other instances of prenatal environment impact on fetal epigenetic state include maternal folic acid, stress, and tobacco smoking during pregnancy.[25][26][27]

Early Life Stress

Early life stress includes parental absence, abuse, and lack of bonding. These stressors in early childhood are associated with epigenetic modifications of the Hypothalamic-Pituitary-Adrenal (HPA) axis, which mediates stress response. Using a rat model of maternal care, reduced care between mother and offspring has been linked with down regulation of glucocorticoid receptors (GR) in the hypothalamus.[28] GRs are an important part of the HPA axis as they help restore normal physiological state after stress exposure. Down regulation of GRs expression occurs through histone modifications and DNA methylation of the GR gene, resulting in dysregulation of the stress response, including prolonged inflammation and cellular damage.[28] Several studies have also associated early life stress with later-life psychiatric disorders including anxiety and depression through epigenetic modulation of genes involved in the HPA axis.[29]

Studying Gene-Environment Interplay

Adoption and Twin Studies

Adoption and twin studies are used to investigate the complex interplay between genes and the environment. These studies typically involve the comparison of identical (monozygotic) and fraternal (dizygotic) twins to determine the extent to which genetic factors and environmental influences contribute to variations in traits or behaviors. These studies have contributed to studies of behavior, personality, and psychiatric illnesses.[30] For example, a Finnish adoption study on schizophrenia revealed that a healthy environment can mitigate the effects of genetics in adopted individuals born to schizophrenic mothers.[31] Criminal and antisocial behavior have also been found to be influenced by both genetic and environmental factors through these types of studies.[32][33]

Animal Models

Animal models provide a controlled and manipulable environment in which researchers can investigate the complex interactions between genes and environmental factors, shedding light on various biological and behavioral outcomes. For example, one study has demonstrated the utility of mouse models in understanding gene-environment interactions in schizophrenia due to the genetic similarities.[34]

Research on moths and butterflies has shown that environmental factors like bright sunlight influences their color vision. In environments with more light, they develop more different opsins which allow them to detect light and discern colors. Butterflies depend on color vision to find the correct flowers for their diet and their preferred habitat.[35]

Medical Conditions

Gene-environment interplay has been found to play a part in the majority of diseases. For instance, gene-environment interactions have a prevalent role in mental health disorders; specifically, evidence has found a link to alcohol dependence,[33] schizophrenia,[36] and psychosis.[37] There is a common polymorphism, or variant, in the AKT1 gene that causes its carriers who regularly use cannabis to be more susceptible to developing psychosis.[37] Evidence also supports gene-environment interplay to be connected to cardiovascular and metabolic conditions.[3] These include roles in obesity,[38] pulmonary disease,[39] and diabetes.[40] The rise in the incidence of diabetes is suggested to be linked to interactions between the FTO or KCNQ1 genes and environmental factors.[40]

References

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