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

遺伝子発現は、放射線、温度、行動、栄養、ストレスなどの環境要因の影響を受けます。
反応の範囲は、遺伝子が身体的形質の潜在的な限界を設定し、環境条件がその限界内で実際の結果を形作ることを示唆しています。たとえば、遺伝学では、個人の潜在的な身長範囲 (5'5" から 6'1" など) を設定する場合があります。ただし、栄養やヘルスケアなどの環境要因によって、この範囲内で達成される実際の身長が決まります。
遺伝的環境相関は、遺伝子と環境との間の双方向の影響を強調しており、それぞれが他方に影響を与え、反応します。例えば、読書の遺伝的素因を持つ子供は、早くから本に興味を示し、親や教師がより多くの本やサポートを提供するように促すことがあります。
エピジェネティクスでは、研究者は同一の遺伝子型がどのように多様な表現型につながるかを探求します。例えば、一卵性双生児は同じ遺伝子を持っていますが、環境や人生経験に基づいて、音楽の習熟度や読書習慣などの行動や精神的プロセスに大きな違いを示すことがあります。

遺伝子と環境の相互作用

遺伝子発現は、環境要因によって大きく影響される動的なプロセスです。この相互作用が、生物学的発達の複雑な性質と、遺伝的に同一である個体間でさえも観察される表現型の違いの土台になっています。放射線、温度、行動、栄養、ストレスなどの要因は、遺伝子がどのように発現するかを決定する上で重要な役割を果たします。反応範囲の概念は、この相互作用を理解する上で中心的なものです。これは、遺伝学が潜在的な境界 (身長165cmから185cmまで、など) を確立する一方で、環境の影響がこれらの境界内でどこに個人の特性が落ち着くかを決定するという考え方です。

反応範囲理論は、遺伝子が環境要因の作用する限界を設定することを効果的に説明しています。たとえば、遺伝学が個人の可能な身長範囲が決定する場合、発達年齢における栄養、身体活動、全体的な健康などの環境要因が、その範囲内で個人の実際の身長がどうなるかに影響します。この理論は、遺伝的潜在能力の発現における環境の重要な役割を強調しています。

この相互作用は、遺伝-環境の相関関係を通じてさらに詳しく説明され、双方向の関係が強調されます。遺伝子は環境が個人の特性を形成することに影響を与え、逆に、環境条件が遺伝子発現に影響を与えます。この典型的な例は、読書に傾倒する遺伝的傾向のある子供たちに見られ、彼らはより本を求める可能性が高くなります。この行動は、本へのアクセスの増加や親や教育者からの励ましなど、環境的サポートの強化につながり、それがさらに読書スキルの発達を促進します。

エピジェネティクスの分野では、同一の遺伝子コードがどのように大きく異なる結果をもたらすのかに焦点が当てられています。エピジェネティクスは、DNA配列を変更しないものの遺伝子発現に影響を与える修飾(意図的な変更や調整)を研究します。たとえば、一卵性双生児は同じDNAを共有していますが、異なる環境への暴露や人生経験により、遺伝子発現プロファイルに違いが現れることがあります。これらの違いにより、双子間で多様な健康状態や身体的特徴につながり、環境要因の強力な影響を強調しています。

もう1つのわかりやすい例は、音楽の才能に関するものです。音楽的な遺伝的素質を持つ子供が、音楽経験が豊富な環境で育てられた場合、そのような機会のない子供よりも優れた能力を身につける可能性が高くなります。このシナリオは、遺伝的な可能性を実現し拡張させるうえで、遺伝の潜在的な能力だけでなく、養育が強力な役割を持つことを示しています。

遺伝子発現は、放射線、温度、行動、栄養、ストレスなどの環境要因の影響を受けます。
反応の範囲は示唆しています...

Education

JoVE Core

Introduction to Psychology

心理学概論

Unit 1

ユニット1

Biopsychology

生物心理学

KEY TERMS AND CONCEPTS

主要用語と概念

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

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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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behavioral genetics and its designs

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Evolutionary Psychology and Human Behavior

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somatosensory-motor-and-association-cortex

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major hormones and their functions

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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

Heritability and the Environment

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natural selection and adaptation

Adaptation in Changing Environments

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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.

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How Environment Shapes Gene Expression

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