Omar Khalid
Developmental plasticity refers to the process by which an organism's genetic makeup leads to distinct and lasting phenotypes in response to different environments. It is a crucial concept in biology, with roots in the nature vs nurture debate. Phenotypic plasticity plays a key role in evolution, with environmental stimuli initiating genetic and selection processes. For example, plants can grow taller in low-light conditions to reach sunlight, and animals may change their coloration with the seasons for better camouflage. In humans, role specialization within families is an example of developmental plasticity, as siblings may adopt specialized roles to maximize parental investment. Human pubertal development is another example, as the age of puberty depends on a developmental switch threshold. Furthermore, early life conditions such as nutrition and stress can influence the adult risk of developing metabolic and cardiovascular diseases, showcasing the impact of developmental plasticity on long-term health.
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What You'll Learn
Gene-environment interactions
The environment plays a significant role in how an organism's genotype determines its phenotype and fitness. Different environments can induce distinct phenotypic changes in genetically distinct organisms through genotype-by-environment interactions. For instance, studies on Saccharomyces cerevisiae have shown that mutations in metabolic genes can have varying effects on gene expression and fitness across different environments.
In the context of human development, gene-environment interactions have been observed in early life cognitive development. While genetic factors influence cognitive traits, environmental factors also play a crucial role. Maternal lifestyle, prenatal factors, stress, diet, and exposure to substances like nicotine and alcohol during pregnancy can impact fetal development and increase the risk of developmental disorders and long-term health issues.
Additionally, gene-environment interactions are evident in the development of the nervous system. During this critical period, neural circuits that develop from genetic information are highly sensitive to exogenous and endogenous factors. Exposure to adverse events or environmental hazards during this time can have lasting effects on neuronal structures, leading to behavioural and cognitive defects.
Furthermore, the concept of critical periods in development highlights the plasticity of neural networks. These critical periods can be experience-dependent, where new experiences shape neural connections, or they can be independent of environmental experiences, relying on biological mechanisms and endogenous or exogenous factors. For example, the development of sensory systems undergoes plastic changes during specific critical time periods.
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Human pubertal development
Puberty is the process of physical maturation, during which an adolescent becomes sexually mature and capable of reproduction. This process is initiated by hormonal signals from the brain to the gonads (the ovaries in females and the testicles in males). In response to these signals, the gonads produce hormones that stimulate the growth, function, and transformation of the brain, bones, muscles, blood, skin, hair, breasts, and sex organs.
The average age of puberty onset is between 8 and 13 in females and 9 and 14 in males, with females tending to begin puberty earlier than males. However, there is variation in the age of puberty onset, and it can occur earlier or later than the average range. The process of puberty can be divided into five stages, known as the Tanner stages, ranging from prepubertal to full maturity.
During puberty, individuals experience a range of physical, emotional, and hormonal changes. Physical changes include an increase in height and weight, growth of pubic and other body hair, breast development in females, genital changes in males, voice changes, and the onset of menstruation in females. Emotional changes can include increased aggression, with bullying and violence peaking in middle adolescence. Hormonal changes involve an increase in the production of hormones such as LH (luteinizing hormone), FSH (follicle-stimulating hormone), testosterone, and estrogen, which stimulate the development of secondary sex characteristics.
The early phase of adrenarche, which involves the activation of the adrenal glands, typically occurs between the ages of six and eight, marking the beginning of the process of puberty. The timing of adrenarche can impact the risks for mental health problems and cardiometabolic issues.
The concept of critical periods is relevant to pubertal development, as it establishes a time frame during which the shaping of neural networks can occur. During these critical periods, plasticity occurs due to changes in the structure and function of developing neural circuits. For example, nicotine exposure during early development can have lasting effects on neuronal structures, leading to behavioural and cognitive defects.
Environmental factors can also influence the timing of puberty. For example, exposure to certain chemicals, such as phthalates and bisphenol A (BPA), which is used in plastics, may affect prenatal or postnatal sexual development and lead to early puberty. Additionally, early-life nutrition and stress can impact the risk of developing metabolic and cardiovascular diseases in adulthood.
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Role specialisation in humans
Developmental plasticity is the ability of an individual to modify its development in response to environmental conditions. It involves how neurons and synapses adapt during development, influenced by environmental interactions and learning. An example of developmental plasticity in humans is role specialisation, which can be observed in niche-picking within families.
The theory of birth order as a determinant of personality has been empirically tested, and results suggest that birth order is related to attitudes toward family, friends, and sexual fidelity. Underlying these findings is the theoretical proposition that siblings may adopt specialised roles to obtain adequate parental investment. This model of within-family niches can be expanded to describe society as a whole. Social niche space may be partitioned to reduce competition and maximise individuals' access to resources.
Under conditions of high population density or limited resource availability, there is selective pressure on the evolution of individual differences in personality. Populations of organisms are expected to evolve traits that enable them to survive and reproduce in their unique ecological circumstances. If the environment varies such that organisms face unpredictable changes over many generations, an adaptive response is to evolve a plastic phenotype that enables learning during development. This allows the organism to detect current, relevant environmental cues and respond accordingly.
In humans, research has linked variation in plasticity to physiological traits such as stress reactivity and exposure to prenatal stress-related hormones such as cortisol. For example, individuals who are born small for their gestational age (SGA) have an increased risk of cardiovascular morbidity and mortality in adulthood. Early life nutrition and stress are among the best-documented examples of environmental conditions that influence adult risk for metabolic and cardiovascular diseases.
The degree of security experienced during childhood also sets development on alternative pathways and adaptively shapes the individual's future reproductive strategy. A secure attachment will result in a reproductive strategy based on late maturation and a commitment to long-term relationships, whereas an insecure attachment may lead to a reproductive strategy involving early reproduction and short-term mating.
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Critical periods
The concept of critical periods is a widely accepted and prominent theme in development, with strong implications for developmental plasticity. Critical periods refer to specific time windows during early development when brain plasticity is maximal. These periods are known as critical periods (CPs) and play a crucial role in shaping neural networks and circuits.
During critical periods, plasticity occurs due to changes in the structure and function of developing neural circuits. This plasticity is influenced by endogenous or exogenous factors, including environmental interactions and learning experiences. The brain's plasticity allows it to adapt existing neural connections and accommodate new information and experiences, resulting in developmental changes.
The concept of critical periods highlights the importance of early experiences and interactions in shaping brain development. Experimental interventions, such as altering sensory inputs, can extend, limit, or reopen critical periods, indicating that plasticity regulators can be manipulated throughout an organism's lifetime.
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Synaptic plasticity
Short-term synaptic plasticity refers to changes in synaptic strength that occur on a sub-second timescale, with rapid up-and-down adjustments that determine the importance of a connection to an ongoing conversation. In the mammalian brain, short-term synaptic plasticity influences the information processing function of synapses, enabling them to act as filters with a range of properties. Synapses with a low initial probability of release function as high-pass filters, facilitating high-frequency action potential bursts, while low-frequency bursts are not transmitted as effectively. On the other hand, synapses with a high initial probability of release function as low-pass filters, depressing during high-frequency bursts but reliably relaying low-frequency activity.
Long-term synaptic plasticity (LTSP), in contrast, lasts for tens of minutes to hours or longer. It is induced by protocols that generate "spike-time dependent plasticity" (STDP), where LTP is induced if afferent stimulation generates a synaptic response within a specific time window before the firing of the postsynaptic cell. LTSP can also be induced by applying high-frequency tetanic stimulation to the synapses or by using a "pairing protocol" that involves directly depolarizing the postsynaptic cell while sustaining low-frequency synaptic activation.
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Frequently asked questions
Human pubertal development is an example of developmental plasticity. This physiological event results in permanent biological change, but the age of puberty onset is plastic and depends on various factors.
Plants can exhibit developmental plasticity by growing taller in low-light conditions to reach sunlight.
Animals may exhibit developmental plasticity by changing their coloration with the seasons for better camouflage.
