Maya Ellison
Developmental plasticity refers to the concept that an organism's development is influenced by environmental factors, leading to variations in phenotype. This occurs during growth and development, resulting in adults of different sizes and shapes. In contrast, adult plasticity refers to the brain's ability to adapt and reorganize in adulthood, which is known as neuroplasticity. While neuroplasticity is maximal during development, it declines in adulthood, except for specific brain regions like the motor and prefrontal cortices. The interaction between different forms of plasticity, such as visual and motor plasticity, has been studied in adults, revealing impairments in visual plasticity when induced simultaneously. Understanding these interactions is crucial for developing neuro-rehabilitative interventions. Additionally, adaptive developmental plasticity (ADP) considers how early-life inputs shape later phenotypes, with informational and somatic state-based hypotheses influencing predictions about adult environments and behaviours.
| Characteristics | Developmental Plasticity | Adult Plasticity |
|---|---|---|
| Definition | Refers to the concept that the development of the phenotype of an organism is responsive to variations in the quality and quantity of environmental factors required for life. | Refers to the alternative phenotype-varying mechanisms such as bet-hedging. |
| Environmental Factors | The environmental conditions experienced in early life can profoundly influence human biology and long-term health. | The environmental factors experienced in adulthood can influence human biology and health, but the impact may be different from that of early life environmental factors. |
| Examples | In utero exposure to nicotine, early life nutrition, exposure to adverse psychological events, exposure to famine in utero, introduction of formula feeding, early adversity, etc. | Visual plasticity, motor plasticity, working memory, etc. |
| Neuroplasticity | Neuroplasticity is maximal during development and declines in adulthood, especially for sensory cortices. | The motor and prefrontal cortices retain plasticity throughout the lifespan. |
| Role Specialization | Role specialization may represent an example of developmental plasticity in humans, such as niche-picking within families. | Role specialization in adulthood may be less flexible due to fixed sizes and shapes of adults, especially for total stature and the length of body segments. |
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What You'll Learn
Developmental plasticity is influenced by environmental factors
The concept of developmental plasticity refers to the idea that the development of an organism's phenotype is responsive to variations in the quality and quantity of environmental factors required for life. This responsiveness is particularly evident during the years of growth and development, where humans can grow more or less of various tissues, ultimately becoming adults of varying sizes and shapes. The environmental signals that influence this process include pre-and postnatal nutrition, stressors, endocrine-disrupting chemicals (EDCs), and light.
The impact of early life environments on later life traits is also observed in non-human organisms. For example, Florida carpenter ants exhibit polyphenism, where altering environmental conditions during development lead to distinct adult ant morphologies. Similarly, red deer and Asian elephants born during challenging ecological periods experience faster reproductive senescence than those born in more favourable conditions.
The influence of environmental factors on developmental plasticity can be further understood through evolutionary explanations. 'Development constraints' models suggest that in the face of early adversity, natural selection favours strategies that promote immediate survival, even if other aspects of development are impaired. This can result in negative consequences later in life, as seen in the silver spoon effect and the thrifty phenotype hypothesis. The former describes how exposure to favourable conditions during development produces fitness advantages in adulthood, while the latter links inadequate early nutrition to impaired pancreatic function and a predisposition to metabolic disorders in adulthood.
Additionally, the allostatic load hypothesis considers the cumulative impact of stressors during development and throughout life, leading to increased susceptibility to disease. These hypotheses highlight how developmental plasticity is shaped by environmental factors, with potential trade-offs between immediate survival and long-term health.
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Neuroplasticity is maximal during development
Neuroplasticity, or the brain's ability to change and reorganise itself in response to internal and external stimuli, is considered maximal during development and decreases in adulthood. This is especially true for the sensory cortices, while the motor and prefrontal cortices retain plasticity throughout the lifespan.
The concept of critical periods is a widely accepted and prominent theme in development, with strong implications for developmental plasticity. During these critical periods, the brain exhibits heightened sensitivity to environmental stimuli, which shape its structure and function. This sensitivity is believed to decrease with age, making early experiences particularly crucial for brain development.
The formation of the nervous system is a pivotal event in the developing embryo. The differentiation of stem cell precursors into specialised neurons gives rise to the formation of synapses and neural circuits, which underlies the principle of plasticity. Experimental evidence supports this notion, as rats raised in an environment with ample social interaction exhibited increased brain weight and cortical thickness compared to those deprived of social interaction.
In humans, the quality of early life experiences and environmental conditions can have profound effects on health and development. For example, in utero exposure to nicotine has been linked to severe physical and cognitive deficits due to the disruption of normal acetylcholine receptor activation. Similarly, early life nutrition and stress are well-documented factors that influence the risk of developing metabolic diseases such as type 2 diabetes and cardiovascular diseases in adulthood.
Additionally, the concept of "developmental constraints" posits that in the face of early adversity, natural selection favours strategies that promote immediate survival, even if other aspects of development are impaired. This can lead to negative consequences later in life, such as an increased risk of metabolic disorders or mental health issues. Thus, the maximised neuroplasticity during development shapes not only the brain's structure but also long-term health outcomes.
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Early-life conditions impact later-life health
Early-life conditions have a significant impact on later-life health, with evidence suggesting that the environment can influence human growth and developmental trajectories during pre-adult life stages. This is known as developmental plasticity, which refers to the concept that an organism's phenotype is shaped by variations in environmental factors during its growth and development.
The environmental conditions experienced early in life can profoundly influence human biology and long-term health. For example, early life nutrition and stress are well-documented factors that influence the adult risk of developing metabolic diseases such as type 2 diabetes and cardiovascular diseases. Similarly, children exposed to numerous adverse psychological events experience more physiological issues by midlife and live shorter lives on average than those exposed to fewer such events. This is supported by studies on non-human vertebrates, which show that individuals born during challenging ecological periods experience faster reproductive senescence.
Developmental plasticity is particularly evident during transition periods between life stages, which are sensitive windows of adaptive plasticity. For instance, in utero exposure to nicotine has been linked to severe physical and cognitive deficits due to the disruption of normal acetylcholine receptor activation. This can lead to compensatory developmental plasticity as the overall circuit becomes less sensitive to stimuli. Additionally, early-life cues have been linked to later disease risk, with extensive epidemiological data showing a clear gradation in this relationship.
Furthermore, birth order within families can also influence later-life health. First-born children, for example, are more likely to be born smaller and exhibit higher insulin resistance in later childhood, leading to increased adiposity in adulthood. This effect has also been linked to the introduction of formula feeding, which has been associated with an increased risk of obesity.
While plasticity is prominent during development, it does decrease in adulthood, particularly in the sensory cortices. However, the motor and prefrontal cortices retain plasticity throughout life, and visual and motor plasticity have been found to share common neural mechanisms. Thus, understanding the interaction between different forms of plasticity is crucial for developing neuro-rehabilitative interventions for neurological diseases and brain injuries.
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Genetic variation influences developmental plasticity
Phenotypic plasticity is the ability of a genotype to produce different phenotypes in response to distinct environmental conditions. It is a universal property of living things, as all organisms respond to genes and the environment. The environment can influence growth and developmental trajectories during pre-adult life history stages, and later life outcomes have been the subject of much research.
The concept of genotype is central to both biological and human sciences. New findings at the molecular level have established that it is gene expression, as regulated by environmental and cellular factors, that shapes phenotypic variation. This has led to a focus on individual developmental plasticity.
The environmental conditions experienced in early life can profoundly influence human biology and long-term health. For example, in utero exposure to nicotine has been linked to severe physical and cognitive deficits due to the disruption of normal acetylcholine receptor activation. Similarly, humans exposed to famine in utero exhibit higher rates of obesity, heart disease, and schizophrenia in adulthood than siblings conceived under better conditions.
The internal signals that modulate this plasticity include leptin, the growth hormone, insulin-like growth factor 1 (GH-IGF1) axis, ghrelin, thyroid hormones, insulin, and the cortisone-cortisol shuttle. The environmental signals include pre-and postnatal nutrition, stressors, endocrine-disrupting chemicals (EDCs), and light.
The transition periods between the prenatal, infantile, childhood, juvenile, and pubertal growth phases are sensitive windows of developmental plasticity. With decreasing sensitivity, the transitions between phases are periods of adaptive plasticity, and the multifactorial regulation of growth during each phase mirrors the interplay between genetic, hormonal, environmental, and psychosocial factors.
In conclusion, genetic variation influences developmental plasticity by shaping phenotypic variation and determining an organism's response to environmental cues.
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Developmental plasticity is studied through various assays
Developmental plasticity refers to the changes in neural connections during growth, influenced by environmental interactions and learning. It involves how neurons and synapses adapt during development, with most of these connections forming from birth to early childhood. The environment experienced during the early stages of life impacts the physical development of the child.
Fate Challenge Assays
These assays involve the ectopic expression of a tissue identity gene throughout the embryo. For example, HLH-1/MyoD is a transcription factor specifying muscle tissue, and its expression is typically restricted to cells that will become muscle. By expressing HLH-1 in all blastomeres before or during the 2E stage, the entire embryo can be converted to muscle. However, if the expression begins at the 8E stage, many cells retain their original fate. This demonstrates the flexibility of early cells to give rise to descendants of different fates.
In Vitro Synaptic Quantification
This method uses immunofluorescence to measure synaptic density in different cell cultures, providing insights into the formation and adaptation of neural connections.
Patch-Clamping and Calcium Imaging
These techniques are used to detect spontaneous neuronal activity and study the electrical properties of neurons and synapses.
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This tracing method employs the migration of a neurotropic virus through interconnected neurons, allowing for the specific site labeling of distinct connections and the assessment of neuronal network depth.
Life History Evolutionary Theory
By applying this theory to developmental data, researchers can understand the adaptive growth and metabolic strategies that facilitate the transition between life history phases. This includes the impact of early life conditions on adult health and disease risk, such as the link between early nutrition and stress and the development of metabolic diseases.
Reaction Norms and Polyphenism
Reaction norms graphically represent the variation in plasticity across a population, allowing for the evaluation of different phenotypes in response to environmental signals. In contrast, polyphenism is the ability of a single genotype to produce multiple phenotypes in response to environmental changes, observed in both vertebrates and invertebrates.
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Frequently asked questions
Plasticity is the concept that the development of the phenotype of an organism is responsive to variations in the quality and quantity of environmental factors required for life.
Developmental plasticity is the responsiveness to environmental factors during an organism's initial growth. These factors influence growth and developmental trajectories during pre-adult life history stages.
Adult plasticity is a type of phenotype-varying mechanism. It is distinguished from developmental plasticity by the fact that responsiveness to environmental factors occurs after the period of an organism's initial growth.
Developmental plasticity occurs during an organism's initial growth, whereas adult plasticity occurs after this period.
