Name: how environment shapes gene expression
Uploaded: 2024-10-24T14:03:06.000Z
Duration: 1 min 20 s
Channel: JoVE

K12 Standards

Florida Department of Education

High School

Life Science

SC.912.L.14

SC.912.L.14.6

Gene-Environment Interactions

L’expression des gènes est influencée par des facteurs environnementaux tels que le rayonnement, la température, le comportement, la nutrition et le stress.
La gamme de réactions suggère que les gènes fixent des limites potentielles pour les traits physiques, tandis que les conditions environnementales façonnent les résultats réels à l’intérieur de ces limites. Par exemple, la génétique peut définir une fourchette de taille potentielle, telle que 5'5 » à 6'1 », pour un individu. Cependant, des facteurs environnementaux tels que la nutrition et les soins de santé déterminent la taille réelle atteinte dans cette plage.
La corrélation génétique-environnementale met en évidence l’influence bidirectionnelle entre les gènes et l’environnement, où chacun influence et répond à l’autre. Par exemple, un enfant ayant une prédisposition génétique à la lecture peut montrer un intérêt précoce pour les livres, ce qui incite les parents et les enseignants à fournir plus de livres et de soutien.
En épigénétique, les chercheurs explorent comment des génotypes identiques peuvent conduire à des phénotypes différents. Les jumeaux identiques, par exemple, ont les mêmes gènes, mais peuvent présenter des différences significatives dans les comportements et les processus mentaux, comme les compétences musicales ou les habitudes de lecture, en fonction de l’environnement et des expériences de vie.

interactions gène-environnement

L'expression des gènes est un processus dynamique fortement influencé par les facteurs environnementaux. Cette interaction sous-tend la nature complexe du développement biologique et les différences phénotypiques observées entre les individus, même chez ceux qui ont une constitution génétique identique. Des facteurs tels que le rayonnement, la température, le comportement, la nutrition et le stress jouent un rôle essentiel dans la détermination de la manière dont les gènes s'expriment. Le concept de plage de réaction est crucial pour comprendre cette interaction. Il postule que si la génétique établit les limites potentielles (par exemple, une plage de taille comprise entre 165 cm et 185 cm), les influences environnementales déterminent où se situeront les traits d'un individu à l'intérieur de ces limites.

La théorie de la plage de réaction montre que les gènes définissent les limites dans lesquelles les facteurs environnementaux agissent. Par exemple, si la génétique détermine la plage de taille possible d’un individu, des facteurs environnementaux comme la nutrition, l’activité physique et la santé générale pendant les années de développement influenceront la taille réelle de l’individu dans cette au sein de cette plage. Cette théorie met en évidence le rôle important de l’environnement dans l’expression du potentiel génétique.

Cette interaction est encore plus complexe par la corrélation gène-environnent, qui souligne une relation bidirectionnelle. Les gènes peuvent influencer la façon dont l'environnement façonne les traits individuels et, inversement, les conditions environnementales peuvent affecter l'expression des gènes. Un exemple classique de ce phénomène est observé chez les enfants ayant une prédisposition génétique à la lecture, qui sont plus susceptibles de rechercher des livres. Ce comportement peut conduire à un soutien environnemental accru, comme un accès amélioré aux livres et des encouragements de la part des parents et des éducateurs, ce qui, à son tour, favorise le développement des compétences en lecture.

Dans le domaine de l’épigénétique, l’accent est mis sur la façon dont des codes génétiques identiques peuvent entraîner des résultats très différents. L’épigénétique étudie les modifications qui ne changent pas la séquence d’ADN, mais qui affectent néanmoins l’activité des gènes. Des jumeaux identiques, par exemple, partagent le même ADN, mais peuvent présenter des différences dans les profils d’expression génétique en raison d’expositions environnementales et d’expériences de vie distinctes. Ces différences peuvent conduire à des variations en matière de santé et à des caractéristiques physiques différentes entre les jumeaux, soulignant l’effet puissant des facteurs environnementaux.

Un autre exemple illustratif concerne les aptitudes musicales. Un enfant doté d’une prédisposition génétique pour la musique et élevé dans un environnement riche en expériences musicales a plus de chances de développer de meilleures compétences qu’un enfant qui n’a pas bénéficié de telles opportunités. Ce scénario montre non seulement le potentiel de la génétique, mais aussi le rôle important de l’éducation dans la réalisation et l’extension des possibilités génétiques.

Interactions Gène-Environnement

L’expression des gènes est influencée par des facteurs environnementaux tels que le rayonnement, la température, le comportement, la nutrition et le stress.
La gamme de réactions suggère ...

Education

Enseignement

JoVE Core

Introduction to Psychology

Introduction à la psychologie

Unit 1

Unité 1

Biopsychology

Biopsychologie

KEY TERMS AND CONCEPTS

TERMES ET CONCEPTS CLÉS

how environment shapes gene expression

Environmental factors can change how genes are expressed. Gene expression is a dynamic process, and traits can differ even in people with the same DNA. Radiation, temperature, behavior, nutrition, and stress all help shape the final outcome.

The reaction range helps explain this process. It means genes set a possible range for a trait, while the environment helps decide where a person falls within that range. For example, genetics may allow a height range from 5'5&quot; to 6'1&quot;, but nutrition, physical activity, and overall health during development can influence the final height.

Gene-environment correlation also plays a role. In this relationship, genes can influence the kind of environment a person seeks out, and the environment can then affect gene expression. A child with a genetic tendency toward reading may choose books more often, which can lead to more support, more access to books, and more encouragement from parents and teachers.

Epigenetics shows how the same DNA can lead to different results. It studies changes that do not alter the DNA sequence but still affect gene activity. Identical twins are a clear example because they share the same DNA, yet different environments and life experiences can lead to different gene expression patterns and different health or physical traits.

Musical ability also shows this interaction. A child with a genetic inclination for music may develop stronger skills when raised in an environment rich in musical experiences. This example shows that genetics can provide potential, but nurturing and experience can help shape how far that potential develops.

How Environment Shapes Gene Expression

introduction to biological bases of psychology

introduction-to-biological-bases-of-psychology

Biological Factors Shaping Behavior and Mind

Biopsychology connects biology and psychology by showing how the body influences behavior and mental processes. It focuses on the nervous system, neurotransmitters, hormones, genetics, and evolutionary ideas. Together, these areas help explain why people think, feel, and act the way they do. The nervous system is the main foundation of biopsychology. It has two parts: the central nervous system, or CNS, and the peripheral nervous system, or PNS. The CNS includes the brain and spinal cord and...

nervous system

Nervous System: CNS, PNS, and Reflexes

The nervous system helps the body sense, move, and respond. It works through a network of nerve cells that carry signals around the body. This system has two main parts: the central nervous system and the peripheral nervous system. The central nervous system, or CNS, includes the brain and spinal cord. The brain acts as the body’s control center. It processes sensory information and helps coordinate responses. The spinal cord serves as a major pathway for signals between the brain and the rest...

neurons as communicators of the brain

Neuron Parts and Signal Transmission

Neurons are the cells that carry information through the brain and nervous system. They use electrical and chemical signals to help control body functions, from heartbeat regulation to complex thinking. Their structure is built for fast, efficient communication. The cell body, or soma, is the neuron’s control center. It contains the nucleus, which holds the cell’s genetic material and helps maintain the neuron’s health and function. The cytoplasm around it contains organelles that make...

neuronal communication

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neurotransmitters

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cerebral hemispheres

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spinal cord

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lateralization

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human genetics

Genes, Behavior, and Mental Health

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How Alleles Shape Inherited Traits

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behavioral genetics and its designs

How Behavior Genetics Studies Inheritance

Behavior genetics studies how inherited genes influence human behavior. It looks at how genes passed from parents to offspring help shape behavioral traits and tendencies. The field also examines how inherited factors and environmental influences work together. Researchers use family studies, twin studies, and adoption studies to separate genetic and environmental effects. Family studies track traits within biological families to find possible genetic patterns. They have helped identify...

organization of the brain

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evolutionary psychology

Evolutionary Psychology and Human Behavior

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neuroplasticity

How the Brain Rewires Itself

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brain imaging

Brain Scanning Techniques

Brain scanning techniques help scientists and doctors see the structure and activity of the human brain. These methods support the diagnosis, study, and treatment of neurological and psychiatric disorders. The main techniques include computerized axial tomography, or CT, positron-emission tomography, or PET, magnetic resonance imaging, or MRI, functional magnetic resonance imaging, or fMRI, and transcranial magnetic stimulation, or TMS. CT scans use X-ray technology to build detailed...

the endocrine system

Endocrine Glands and Hormone Signals

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somatosensory, motor, and association cortex

somatosensory-motor-and-association-cortex

Brain Cortex Areas for Sensation and Movement

The brain cortex uses separate areas for sensation, movement, and higher thinking. The somatosensory cortex is in the parietal lobes. It helps the brain interpret touch, temperature, and proprioception, which is awareness of body position. The somatosensory cortex has an organized map of the body. Neurons at the top of this region mainly process signals from the lower body. Neurons at the bottom handle input from the upper body. This layout helps the brain locate sensory input with precision.

major hormones and their functions

Hormone Imbalances and Their Effects

Hormones are chemical messengers made by endocrine glands. They help control body functions and keep internal conditions stable. When hormone levels shift too far up or down, normal body processes can be disrupted. Several major hormones have clear roles in the body. Oxytocin is made in the hypothalamus and released by the pituitary gland. It supports social bonding, childbirth, and lactation. Low oxytocin can affect social interaction and stress response, and it may contribute to depression.

inheritance

Genes, Traits, and Mendel's Rules

Genes, traits, and Mendel's rules explain how characteristics pass from parents to offspring. Gregor Mendel's pea plant experiments changed how scientists understand heredity. His work showed that traits are controlled by discrete units inside organisms called genes. Genes usually come in pairs. One gene is inherited from each parent, and together they make a person's genotype. Genotype is the genetic blueprint for potential traits. Examples include blood type, eye color, and inherited...

gene-environment interactions

Environmental factors can change how genes are expressed. Gene expression is a dynamic process, and traits can differ even in people with the same DNA. Radiation, temperature, behavior, nutrition, and stress all help shape the final outcome. The reaction range helps explain this process. It means genes set a possible range for a trait, while the environment helps decide where a person falls within that range. For example, genetics may allow a height range from 5'5" to 6'1", but nutrition,...

heritability

Heritability and the Environment

Heritability describes how genetic differences contribute to trait variation in a population. It is a statistical measure, so it shows how much of the spread in a trait can be linked to genes across a group. It does not tell you how “genetic” a trait is in an individual person. Heritability is usually expressed as a percentage. That percentage can change depending on which population is studied and what environmental conditions are present. This means heritability is context-dependent, not...

natural selection and adaptation

Adaptation in Changing Environments

Natural selection explains how organisms become better suited to their environments over time. It favors individuals with traits that improve survival and reproduction. Adaptation is the result. It includes genetic changes that help an organism function in specific conditions, such as extreme cold or thinner air at high altitudes. Adaptation is not only physical. Psychological adaptation also helps organisms, especially humans, succeed in their surroundings. These responses come from both...

natural selection and mating preferences

How Selection Shapes Mate Choice

Natural selection and mating preferences work together to shape how organisms survive and reproduce. Natural selection favors traits that help an organism fit its environment. Mating preferences are part of sexual selection, which influences who mates with whom and how genes are passed on. Evolutionary psychologists argue that these preferences are tied to instincts that support reproduction. For females, conception, pregnancy, and nursing create a strong need to choose mates who can offer...

criticisms of the evolutionary perspective

criticisms-of-the-evolutionary-perspective

Social Learning vs. Evolutionary Psychology

Social learning theory and evolutionary psychology offer two different ways to explain sexual behavior. A study in which strangers gave students compliments and then asked for casual sex showed a clear gender gap. None of the women said yes, while 70% of the men agreed. Evolutionary psychology explains this result by arguing that natural selection may have shaped women to be more selective about sexual partners. From this view, selectivity can help improve survival and reproductive success. It...

key terms and concepts

Explore how nutrition, stress, behavior, and other environmental factors influence gene expression, reaction range, epigenetics, and trait development.

How Environment Shapes Gene Expression | JoVE K12

JoVE Core Introduction to Psychology offers an engaging learning experience on the fundamental principles of psychology through concise video lessons. Students will explore important topics such as cognitive processes, emotional regulation, and neural mechanisms, establishing a strong foundation in the study of the mind and human behavior. This series provides an accessible and captivating approach to grasp the essential concepts of the discipline.

introduction to psychology

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SC.912.L.14.4

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How Environment Shapes Gene Expression

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