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Genes play a significant role in muscle strength and density. For instance, the MSTN gene, which provides instructions for making a protein called myostatin, limits muscle growth to ensure they do not grow too large. In a study, researchers at the Salk Institute for Biological Studies and two Swiss institutions found that by acting on a genome regulator (NCoR1), they could modulate the activity of certain genes, creating mice with twice the muscle strength of normal mice. Similarly, researchers in China have edited the genome of beagles to create double the amount of muscle. While genes play a role in muscle density, other factors such as age, region, and muscle fiber area also contribute to muscle density.
| Characteristics | Values |
|---|---|
| Muscle strength and density are influenced by | Genetic factors and corepressors |
| Muscle density is influenced by | Age |
| Muscle density is influenced by | Anatomical region |
| Muscle density is influenced by | Average muscle fiber area |
| Muscle density is influenced by | Average percent fiber area |
| Muscle strength and density are influenced by | Polymorphisms in the TRHR gene |
| Muscle strength and density are influenced by | Genes in the cells |
| Genes can be responsible for | Muscle growth |
| Genes can be responsible for | Muscle strength |
| Genes can be responsible for | Athletic performance |
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What You'll Learn
Muscle density is influenced by genetics
Genetics play a role in muscle density, with lean body mass and muscle strength being associated with bone mineral density (BMD), which is known to be under strong genetic control. A twin study found that BMD correlated with both leg extensor strength and grip strength, and that lean mass was significantly correlated with BMD at all sites. This suggests that muscle density is influenced by genetics.
Additionally, specific genes can cause muscles to grow faster or stronger. For example, the MSTN gene provides instructions for making a protein called myostatin, which normally limits muscle growth. Variants in this gene can lead to myostatin-related muscle hypertrophy, resulting in increased muscle size and strength. Researchers have also been able to create super-strong mice and worms by suppressing a natural muscle-growth inhibitor and acting on a genome regulator (NCoR1).
Furthermore, certain genes in the cells of athletes can be encoded with instructions to build up specific types of muscles, such as fast-fiber muscles for explosive power or slow-contracting muscles for endurance. While the specific genes responsible for athletic prowess are still being identified, over 220 genes have been identified as potentially responsible for determining athletic performance.
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Genes can be edited to increase muscle mass
Muscle strength and lean body mass are associated with bone mineral density (BMD), which is known to be under strong genetic control. While the genetic component of BMD is not entirely dependent on muscle bulk and strength, it does suggest the potential for clinical intervention and lifestyle modifications.
Indeed, genes can be edited to increase muscle mass. For example, in a study by the Salk Institute for Biological Studies, scientists created super-strong, high-endurance mice and worms by suppressing a natural muscle-growth inhibitor. By acting on a genome regulator (NCoR1), they modulated the activity of certain genes, creating a strain of mice with twice the muscle strength of normal mice.
In another study, researchers identified 47 genes whose mutation induces muscle hypertrophy in mice. These genes were then analysed for their expression pattern in human tissues and different muscle fibres, as well as their response to high-intensity and resistance exercise.
Gene therapy has also been shown to improve muscle mass and strength in monkeys. A study by the Nationwide Children's Hospital used follistatin gene delivery to enhance muscle growth and strength in non-human primates. The researchers suggested that this approach could be effective in treating various types of degenerative muscle disorders, including multiple forms of muscular dystrophy.
Additionally, gene-editing has been explored as a technique for growth promotion in livestock, particularly in pigs. Editing the myostatin (MSTN) gene, which normally limits muscle growth, has resulted in increased muscle growth and body weight in pigs. However, viability has been a challenge, with poor survival rates observed in pigs with MSTN loss-of-function mutations.
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Muscle strength is associated with bone mineral density
Muscle strength is closely associated with bone mineral density (BMD). While lean body mass and muscle strength are known to be under strong genetic control, the genetic component to muscle bulk and strength accounts for a small part of the genetic component of BMD. This suggests that bone-specific genes may exist.
Several studies have been conducted to examine the impact of lower extremity muscle strength and mass on BMD in the general American population. One such study extracted data from 2165 individuals from the National Health and Nutrition Examination Survey 1999–2002. Multivariate logistic regression models, fitted smoothing curves, and generalized additive models were used to examine the association between muscle strength, muscle mass, and BMD. After adjusting for potential confounders, significant positive associations were found between peak force and appendicular skeletal muscle index.
Another study, which examined the relationship between hip muscle cross-sectional area, muscle strength, and BMD, found a positive correlation between hip muscle cross-sectional area, muscle strength, and hip BMD. Similarly, a study on postmenopausal women confirmed that the decrease in muscle strength was positively correlated with the decrease in BMD.
In adolescents, studies have shown that handgrip strength and free-fat mass are positively associated with bone mineral density. These findings suggest that muscle strength plays a crucial role in maintaining bone health and preventing osteoporosis-related fractures during adolescence. Furthermore, muscle strength can be enhanced through genetic engineering, as demonstrated by experiments on mice and worms. By suppressing a natural muscle-growth inhibitor or acting on a genome regulator, scientists were able to create super-strong, high-endurance mice whose muscles were twice as strong as those of normal mice.
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Myostatin-related muscle hypertrophy is a genetic condition
Myostatin-related muscle hypertrophy, also known as muscle hypertrophy syndrome, is a rare genetic condition that causes individuals to develop significantly more muscle mass than is considered normal. The condition is characterised by reduced body fat and increased muscle size, with affected individuals having up to twice the usual amount of muscle mass. This condition is not known to cause any medical problems, and people with this condition are intellectually normal.
The main symptom of myostatin-related muscle hypertrophy is the presence of enlarged muscles, particularly in the thighs, calves, and upper arms. The oversized muscles are usually identified at birth or during infancy, with infants and children often measuring above average on weight charts. Myostatin-related muscle hypertrophy is caused by variants or mutations in the MSTN gene, which provides instructions for making a protein called myostatin. This protein is active in skeletal muscles, both before and after birth, and normally limits muscle growth to ensure they do not grow too large.
The inheritance pattern of myostatin-related muscle hypertrophy is known as incomplete autosomal dominance. People with a variant in both copies of the MSTN gene in each cell (homozygotes) have significantly increased muscle mass and strength. Those with a variant in only one copy of the gene (heterozygotes) also exhibit increased muscle bulk, but to a lesser degree. The prevalence of this condition is unknown, and there is currently no treatment available. However, it is important to note that myostatin-related muscle hypertrophy is not associated with any health issues or complications, and it does not cause developmental delays.
The effect of myostatin on muscle growth was first observed in cattle by British farmer H. Culley in 1807, who described the phenomenon as "bovine muscular hypertrophy". More recently, researchers in China have successfully edited the genome of beagles to create double the amount of muscle mass. This research aims to improve the treatment of genetic neuromuscular diseases such as Parkinson's disease.
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Genes can be manipulated to improve muscle strength
Muscle strength and lean body mass are associated with bone mineral density (BMD), which is known to be under strong genetic control. Genes such as the MSTN gene, which provides instructions for making a protein called myostatin, can cause myostatin-related muscle hypertrophy, resulting in increased muscle strength and size.
Recent studies have shown that it is possible to manipulate genes to improve muscle strength. For example, researchers from the Salk Institute for Biological Studies and two Swiss institutions, Ecole Polytechnique Federale de Lausanne (EPFL) and the University of Lausanne, conducted a study on mice and worms. They found that by suppressing a natural muscle-growth inhibitor called NCoR1, they could modulate gene activity and create super-strong, high-endurance mice with twice the muscle strength of normal mice. This suggests that similar interventions could be used to treat age-related or genetic muscle degeneration in humans.
Additionally, gene therapy has been explored as a potential treatment for muscular maladies and the natural decline in muscle strength associated with aging. Lee Sweeney from the University of Pennsylvania has shown that injecting a manipulated virus carrying a gene for insulin-like growth factor 1 (IGF1) into muscles causes a 15-30% increase in muscle size and strength in rats. When combined with an exercise program, the rats doubled their muscle strength.
Furthermore, a University of Melbourne-led study identified the C18ORF25 gene, which is activated during exercise and promotes muscle strength. By activating this gene, researchers were able to observe stronger muscles without a corresponding increase in muscle size. This discovery could have implications for healthy aging, diseases of muscle atrophy, sports science, and even livestock and meat production.
While these studies show promise in manipulating genes to improve muscle strength, it is important to consider potential ethical implications, especially in the context of athletic performance enhancement.
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Frequently asked questions
Muscle density is calculated by dividing muscle mass by the product of a muscle’s average fascicle length and a theoretical constant representing the density of mammalian skeletal muscle. Genes play a role in determining muscle mass and fascicle length, which are two of the three variables used to calculate muscle density.
Genes have been found to influence muscle strength. For example, researchers have discovered that sprinter Tyson Gay's genes were encoded with instructions to build up fast-fiber muscles, giving him explosive power. In another instance, scientists created super-strong mice and worms by suppressing a natural muscle-growth inhibitor.
Scientists have successfully edited the genome of beagles to increase their muscle mass. In another instance, researchers were able to create super-strong mice by acting on a genome regulator. These studies suggest that gene therapy could be used to increase muscle density.
Myostatin-related muscle hypertrophy is a rare condition characterized by reduced body fat and increased muscle size. Variants in the MSTN gene cause this condition by limiting the production of the myostatin protein, which normally restricts muscle growth.
