We all have the appearance and characteristics that we inherit from our parents, right? Some say, "My eyes are exactly like my mother's," and "My anger comes from my father." All of this is determined by genes, the smallest things in our bodies. Simply put, these genes are like a big book that contains instructions on how our body should be built and how it should function. What happens if a letter or word in this instruction book is wrong, if there is a small change? That's what we call a genetic mutation . This is what we are talking about today.
Simply put, what is a genetic mutation?
A genetic mutation is a change in the DNA sequence in your body. Think of your body as a big building. The blueprint, or plan, for building that building is your DNA. This DNA contains genes. This plan is what tells every cell in your body what to do.
So, what happens if there's a slight change somewhere in this blueprint, if a line is drawn in the wrong place, or if a part is deleted? That's what a genetic mutation is. If a part of the DNA sequence is in the wrong place, is incomplete, or is damaged in some way, you can develop symptoms of a genetic condition.
How and when do these genetic mutations occur?
These mainly occur during cell division . That is, when a single cell in our body divides and new cells are formed. Imagine that you are copying a large book and making many more books. When you are copying, mistakes can happen, right? That is what happens here too.
There are two main ways in which this cell division occurs in our body:
1. Mitosis: This is what happens when our body makes new cells. For example, when you have a wound on your skin, new cells need to be produced to heal it. This is what this division is used for. What happens here is that a copy of the chromosomes in the existing cell is made and then it divides into two cells.
2. Meiosis: This is a special process. It produces egg cells and sperm cells that are needed to make the next generation. The special thing here is that only half of the 46 chromosomes in the original cell, that is, only 23, go to the new cells. That is why you get the same genetic information from both your mother and father.
So, during this process of cell division, small mistakes can occur when DNA is copied. Just like when copying a book, a letter may be left out, a letter may be shifted, or a new letter may be added.
- Substitution of a letter.
- Deleting a letter (delete) .
- Inserting an extra letter.
When this kind of mistake (genetic mutation) occurs, the cells can no longer read the instructions in that instruction book. Maybe necessary parts are missing, or unnecessary parts are added. All of this ultimately means that the cells can no longer do their job properly.
How does a genetic mutation affect our body?
A genetic mutation is a change in the information your cells need. Our genes are the instructions for making proteins in our bodies. These proteins control almost everything in our bodies - from our appearance, such as height, skin color, and hair color, to every process that happens inside the body.
So when a gene mutation occurs, the way these proteins are made can change. Then the cells start doing something different, not the job they're supposed to do. That's why the symptoms of genetic diseases appear.
These symptoms depend on which gene the mutation occurs in. There are a wide range of diseases and conditions caused by mutations. Here are some of the symptoms you may experience:
- Changes in physical appearance: things like facial abnormalities, cleft palate, webbed fingers, and short stature.
- Intellectual functioning problems: learning disabilities and developmental delays.
- Vision or hearing impairment.
- Difficulty breathing.
- Increased risk of cancer.
Are all genetic mutations bad? Are there any good ones?
No. This is a common misconception. Not all gene mutations cause disease. Some gene mutations are just there without affecting your health. The reason is that even if there is a change in the DNA sequence, it does not make a big difference to how the cell functions.
And our bodies are amazing. We have special parts in our bodies called enzymes . These can repair certain genetic mutations that occur before they affect the cell. It's like erasing a wrong letter in a book and writing it again correctly.
Even more surprising is that some genetic mutations can actually have a positive effect on us. Sometimes these changes improve the proteins our cells make, helping us adapt better to changes in our environment. For example, some people have a genetic mutation that protects them from heart disease and diabetes. They are less likely to develop these diseases than others, even if they smoke or are obese.
Are there any genetic mutations?
Yes. These mutations can be divided into two main types depending on where they occur.
| Mutation Type | Simple explanation |
|---|---|
| Germline Mutation | This happens in the parents' reproductive cells, that is, in a sperm or an egg . Therefore, this mutation is also inherited by the child. This means that it is passed from generation to generation (hereditary) . |
| Somatic Mutation | This happens after a child is conceived, as the embryo develops. These mutations can occur in any cell in the body, but not in reproductive cells (sperm and eggs). Therefore, they are not inherited from parents to children . |
Are these genetic mutations passed down from parents to children? (Inheritance)
Yes, as we mentioned earlier, germline mutations can be inherited from parents to children. Somatic mutations occur randomly, without any family history.
There are several patterns in which a genetic mutation is inherited from a parent to a child. These are a bit complicated, but let's keep it simple.
| Inheritance Pattern | Simple explanation |
|---|---|
| Autosomal Dominant | It is enough for a child to inherit the disease by inheriting the mutated gene from just one parent . For example, Marfan syndrome. |
| Autosomal Recessive | For a child to inherit a disease, both parents must inherit the same mutated gene. For example, sickle cell disease. |
| X-linked Dominant / Recessive | The mutation is on the X chromosome. The way it is inherited varies depending on whether the mother or father carries the mutation and whether the child is male or female. For example: Color blindness. |
| Y-linked | The mutation is on the Y chromosome. Since only males have the Y chromosome, this is only inherited from father to son. |
| Mitochondrial | A change in the DNA in the mitochondria, which provide energy to cells. Since these are only received by a child from the egg cell, these are only inherited from the mother . |
What are Genetic Disorders?
A genetic disease is a condition that is caused by a change in your genetic material (genome). This includes your DNA, genes, and chromosomes. This can be caused by several factors:
- A mutation in one gene (monogenic)
- Mutations in several genes (multifactorial inheritance)
- Mutations in one or more chromosomes
- Environmental factors (exposure to chemicals, UV rays)
Is there anything we can do to prevent genetic mutations?
In fact, there is nothing we can do to prevent some genetic mutations because they occur randomly. However, some mutations are influenced by our lifestyle and environment. This means that we can take steps to reduce the risk of some mutations.
- Avoid smoking completely. The chemicals in tobacco can damage DNA.
- Use a good sunscreen when going out in the sun. Ultraviolet (UV) rays from the sun can damage the DNA of skin cells and cause mutations.
- Avoid exposure to harmful chemicals (carcinogens) and radiation.
- Eat a nutritious, balanced diet. Minimize artificial and processed foods as much as possible.
If you have any concerns or doubts about genetic conditions in your family, or if you are planning to have children, it is best to talk to your doctor about it. If necessary, you can go for genetic testing. These tests can identify any changes in your genes and chromosomes.
Take-Home Message
- A genetic mutation is a change in our body's instruction book, DNA.
- Not all genetic mutations are bad. Some of them do not harm us at all, and others can even be good.
- Some mutations (germline) are inherited from parents to children. Other mutations (somatic) occur randomly during life and are not inherited by children.
- Health habits such as avoiding smoking and protecting yourself from the sun can reduce the risk of developing some genetic mutations.
- If you or someone in your family suspects that you have a genetic condition, it is very important to seek medical advice.
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