Victor Forge
Muscular dystrophy is a condition that is usually inherited from one or both biological parents. It is caused by mutations in the genes responsible for healthy muscle structure and function. The mutations mean that the cells that should maintain your muscles can no longer do so, leading to muscle weakness and progressive disability. There are three ways that muscular dystrophy can be inherited, depending on the specific type: recessive inheritance, dominant inheritance and sex-linked (X-linked) inheritance.
| Characteristics | Values |
|---|---|
| Inheritance | Recessive, dominant, sex-linked (X-linked) |
| Inheritance by type | Myotonic, facioscapulohumeral, oculopharyngeal, limb-girdle, Duchenne |
| Inheritance by sex | Males are more likely to inherit the disease, but females can be carriers |
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What You'll Learn
- Recessive inheritance: inheriting a genetic mutation from both parents
- Dominant inheritance: inheriting a mutated gene from one parent
- Sex-linked (X-linked) inheritance: a genetically male person has one X and one Y chromosome, a genetically female person has two X chromosomes
- Inheritance from the mother: one chromosome from each pair is inherited from the mother
- Inheritance from the father: one chromosome from each pair is inherited from the father
Recessive inheritance: inheriting a genetic mutation from both parents
Recessive inheritance means that you've inherited a genetic mutation that causes the condition from both of your biological parents. In the case of muscular dystrophy, this means inheriting a mutated gene from each parent that affects the genes responsible for healthy muscle structure and function. This results in muscle weakness and progressive disability.
You inherit one chromosome from each pair from your mother and one from your father. If both parents have a mutated gene that causes muscular dystrophy, it can be passed on to their child. This type of inheritance is seen in some forms of limb-girdle muscular dystrophy.
X-linked (or sex-linked) recessive inheritance occurs when the female parent carries the affected gene and passes it to the male child. Duchenne muscular dystrophy (DMD) is an example of this, primarily affecting boys, although girls who carry the defective gene may show some symptoms.
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Dominant inheritance: inheriting a mutated gene from one parent
Muscular dystrophy is caused by mutations in the genes responsible for healthy muscle structure and function. In most cases, it runs in families and is inherited from one or both parents. There are three ways in which muscular dystrophy can be inherited, depending on the specific type: recessive inheritance, dominant inheritance, and sex-linked (X-linked) inheritance.
Dominant inheritance means that you only need to inherit the mutated gene from one of your biological parents to develop the condition. This is in contrast to recessive inheritance, where you inherit a mutated gene from both parents. In the case of dominant inheritance, the mutation is present in only one copy of the gene, but it is enough to cause the condition. This type of inheritance is seen in some forms of limb-girdle muscular dystrophy.
When a person inherits a mutated gene from only one parent, it means that they have one copy of the gene with the mutation and one copy of the gene without the mutation. This is because you inherit one chromosome from each pair from your mother and one from your father. If one parent has a mutated gene, there is a 50% chance that their child will inherit it.
The specific symptoms and severity of muscular dystrophy can vary depending on the type of inheritance and the specific gene mutation involved. However, in general, muscular dystrophy causes progressive skeletal muscle deterioration, leading to muscle weakness and disability.
It is important to note that not all cases of muscular dystrophy are inherited. In some rare cases, the condition can occur due to spontaneous gene mutations that are not present in either parent.
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Sex-linked (X-linked) inheritance: a genetically male person has one X and one Y chromosome, a genetically female person has two X chromosomes
Muscular dystrophy is usually inherited from one or both biological parents. There are three ways that muscular dystrophy can be inherited, depending on the specific type: recessive inheritance, dominant inheritance, and sex-linked (X-linked) inheritance.
Sex-linked (X-linked) inheritance occurs when a female parent carries the affected gene and passes it to a male child. This is because a genetically male person has one X and one Y chromosome, while a genetically female person has two X chromosomes. If a female inherits the mutated gene, she may show some symptoms of muscular dystrophy, but it is usually less severe than in males.
X-linked recessive inheritance is the most common form of muscular dystrophy in childhood, known as Duchenne muscular dystrophy (DMD). DMD primarily affects boys because they inherit the mutated gene from their mother's X chromosome. Girls can also carry the defective gene and may show some symptoms, but the condition is typically milder.
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Inheritance from the mother: one chromosome from each pair is inherited from the mother
Muscular dystrophy is usually inherited from one or both biological parents. There are three ways to inherit the condition, depending on the specific type: recessive inheritance, dominant inheritance, and sex-linked (X-linked) inheritance.
In the case of sex-linked inheritance, a genetically male person inherits one X and one Y chromosome, while a genetically female person inherits two X chromosomes. One chromosome from each pair is inherited from the mother, and the other from the father. This means that if a female parent carries the affected gene, she can pass it on to her male child. For example, Duchenne muscular dystrophy (DMD) is caused by a mutation on the X chromosome and primarily affects boys. However, girls who carry the defective gene may also show some symptoms.
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Inheritance from the father: one chromosome from each pair is inherited from the father
Muscular dystrophy is usually inherited from one or both biological parents. Inheritance from the father means that one chromosome from each pair is inherited from him.
Genetically male people have one X and one Y chromosome, while genetically female people have two X chromosomes. If the female parent carries the affected gene, she can pass it to the male child. This is known as X-linked (or sex-linked) recessive inheritance. Duchenne muscular dystrophy (DMD) is the most common form of MD in childhood and primarily affects boys. Girls who carry the defective gene may show some symptoms.
There are three ways to inherit muscular dystrophy: recessive inheritance, dominant inheritance, and sex-linked inheritance. Recessive inheritance means that a person has inherited a genetic mutation that causes the condition from both biological parents. Dominant inheritance means that a person only needs to inherit the mutated gene from one biological parent to develop the condition. Sex-linked inheritance, as mentioned earlier, involves the X chromosome and is typically passed from a female parent to a male child.
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Frequently asked questions
In most cases, muscular dystrophy is inherited from one or both biological parents. You have two copies of every gene (except the sex chromosomes) and you inherit one copy from each parent.
Recessive inheritance means you've inherited a genetic mutation that causes the condition from both of your biological parents.
Dominant inheritance means you only need to inherit the mutated gene from one of your biological parents to develop the condition.
