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

Die Genexpression wird von Umweltfaktoren wie Strahlung, Temperatur, Verhalten, Ernährung und Stress beeinflusst.
Die Bandbreite der Reaktionen deutet darauf hin, dass Gene potenzielle Grenzen für körperliche Merkmale setzen, während Umweltbedingungen die tatsächlichen Ergebnisse innerhalb dieser Grenzen beeinflussen. Zum Beispiel könnte die Genetik einen potenziellen Größenbereich festlegen, z. B. 5'5" bis 6'1" für ein Individuum. Umweltfaktoren wie Ernährung und Gesundheit bestimmen jedoch die tatsächliche Höhe, die innerhalb dieses Bereichs erreicht wird.
Die Gen-Umwelt-Korrelation unterstreicht den bidirektionalen Einfluss zwischen Genen und der Umwelt, wobei beide Gene sich gegenseitig beeinflussen und aufeinander reagieren. Zum Beispiel kann ein Kind mit einer genetischen Veranlagung zum Lesen schon früh Interesse an Büchern zeigen, was Eltern und Lehrer dazu veranlasst, mehr Bücher und Unterstützung anzubieten.
In der Epigenetik erforschen Forscher, wie identische Genotypen zu unterschiedlichen Phänotypen führen können. Eineiige Zwillinge zum Beispiel haben die gleichen Gene, können aber je nach Umwelt und Lebenserfahrungen erhebliche Unterschiede in Verhaltensweisen und mentalen Prozessen aufweisen, wie z. B. musikalische Fähigkeiten oder Lesegewohnheiten.

gen-umwelt-interaktionen

Die Genexpression ist ein dynamischer Prozess, der maßgeblich von Umweltfaktoren beeinflusst wird. Diese Interaktion liegt der komplexen Natur der biologischen Entwicklung und den phänotypischen Unterschieden zugrunde, die zwischen Individuen beobachtet werden, selbst zwischen solchen mit identischer genetischer Ausstattung. Faktoren wie Strahlung, Temperatur, Verhalten, Ernährung und Stress spielen eine entscheidende Rolle bei der Bestimmung, wie Gene exprimiert werden. Das Konzept des Reaktionsbereichs ist für das Verständnis dieser Interaktion von zentraler Bedeutung. Es besagt, dass die Genetik zwar die potenziellen Grenzen festlegt - beispielsweise eine Körpergröße von 165 cm bis 185 cm -, dass aber Umwelteinflüsse bestimmen, wo innerhalb dieser Grenzen die Merkmale eines Individuums liegen werden.

Die Reaktionsbereichstheorie veranschaulicht effektiv, dass die Gene die Grenzen setzen, innerhalb derer Umweltfaktoren wirken. Wenn beispielsweise die Genetik einen möglichen Größenbereich für eine Person bestimmt, beeinflussen Umweltfaktoren wie die Ernährung, die körperliche Aktivität und die allgemeine Gesundheit während der Entwicklungsjahre, wo innerhalb dieses Bereichs die tatsächliche Größe der Person liegen wird. Diese Theorie unterstreicht die bedeutende Rolle der Umwelt bei der Ausprägung des genetischen Potenzials.

Dieses Zusammenspiel wird durch die genetisch-umweltbedingte Korrelation noch weiter verdeutlicht, die eine bidirektionale Beziehung unterstreicht. Die Gene können die Ausprägung einzelner Merkmale durch die Umwelt beeinflussen, und umgekehrt können die Umweltbedingungen die Genexpression beeinflussen. Ein klassisches Beispiel hierfür sind Kinder mit einer genetischen Neigung zum Lesen, die eher zu Büchern greifen. Dieses Verhalten kann zu einer verstärkten Unterstützung durch die Umwelt führen. Dazu gehören  beispielsweise ein besserer Zugang zu Büchern und die Ermutigung durch die Eltern und Erzieher, was wiederum die weitere Entwicklung der Lesekompetenz fördert.

Im Bereich der Epigenetik liegt der Schwerpunkt darauf, wie identische genetische Codes zu völlig unterschiedlichen Ergebnissen führen können. Die Epigenetik untersucht Modifikationen, die die DNA-Sequenz nicht verändern, aber dennoch die Genaktivität beeinflussen. Eineiige Zwillinge beispielsweise haben dieselbe DNA, können aber aufgrund unterschiedlicher Umwelteinflüsse und Lebenserfahrungen Unterschiede in den Genexpressionsprofilen aufweisen. Diese Unterschiede können zu unterschiedlichen gesundheitlichen Ergebnissen und körperlichen Merkmalen bei Zwillingen führen, was den starken Einfluss von Umweltfaktoren unterstreicht.

Ein weiteres anschauliches Beispiel betrifft musikalische Fähigkeiten. Ein Kind mit einer genetischen Veranlagung für Musik, das in einer Umgebung aufwächst, die reich an musikalischen Erfahrungen ist, wird mit größerer Wahrscheinlichkeit eine höhere Begabung entwickeln als ein Kind ohne derartige Möglichkeiten. Dieses Szenario zeigt nicht nur das Potenzial der Genetik, sondern auch die wichtige Rolle der Erziehung bei der Erlangung und Erweiterung genetischer Möglichkeiten.

Gen-Umwelt-Interaktionen

Die Genexpression wird von Umweltfaktoren wie Strahlung, Temperatur, Verhalten, Ernährung und Stress beeinflusst.
Die Bandbreite der Reaktionen deutet darauf hin, dass ...

Education

Lehre

JoVE Core

Introduction to Psychology

Einführung in die Psychologie

Unit 1

Einheit 1

Biopsychology

Biopsychologie

KEY TERMS AND CONCEPTS

SCHLÜSSELBEGRIFFE UND KONZEPTE

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...

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inheritance

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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

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natural selection and adaptation

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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.

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How Environment Shapes Gene Expression

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