Have you ever wondered why certain diseases are passed down from generation to generation, or why some people are more susceptible to diseases than others? One reason for this is the changes in our genes, which are the smallest things in our bodies. Today we are going to talk about these genetic mutations, or `(Genetic Mutations)`. Don't worry, I will explain this to you in a very simple and understandable way.
What exactly is a genetic mutation?
Simply put, a genetic mutation is a change in the sequence of your `(DNA)`. Think of it like your body is like a big factory. For this factory to work properly, it needs a set of instructions. That set of instructions is our `(DNA)`. This `(DNA)` sequence is what gives our cells the information they need to do their job properly.
Now imagine, what happens if there is a mistake somewhere in this set of instructions, or if a letter is missing, added, or shifted? The whole factory can go haywire, right? In the same way, if a ``DNA'' sequence is in the wrong place, incomplete, or damaged, you can develop symptoms of certain genetic conditions.
How and when do genetic mutations occur?
Genetic mutations mainly occur during cell division. That is, when the cells in our body divide to form new cells. It is during this process of cell division that the information contained in our genes, or ``DNA'', is copied into the new cells.
There are two ways in which cell division occurs:
1. Mitosis: This is the process by which other cells in our body (cells needed for growth and repair) are formed. During the process of mitosis, our genes instruct the cells to make a copy of their chromosomes and divide into two cells.
2. Meiosis: This is the process by which our reproductive cells, egg cells and sperm cells, are produced. During meiosis, the number of chromosomes is reduced to half that of the original cell (from 46 to 23). This is how you get the same amount of genetic information from both your mother and father.
Now look, when these cells divide, it's like when we look at a book and write another book by hand. The information in ``(DNA)`` is copied to the new cells. When this copying is done, sometimes mistakes can happen. Like when we write, we miss a letter, we write an extra letter, or we write another letter instead of one letter.
- Substitute: The replacement of one letter with another.
- Delete: Writing one letter less.
- Insertion: The addition of an extra letter.
If this kind of mistake, that is, a genetic mutation, occurs, the cells may not be able to read the genetic instruction manual, or some parts may be missing, or unnecessary parts may be added. All of this means that our cells cannot do their normal work properly.
How do genetic mutations affect our other organs?
A genetic mutation is a change in the information that our cells need to form and function. Our genes are the instructions that our bodies need to make proteins. These proteins determine the shape and function of our bodies. So, if you have a genetic mutation, your cells may not be doing the job they are supposed to, and you may experience symptoms of genetic conditions.
The symptoms of genetic conditions depend on which gene is mutated. There are many different diseases and conditions caused by these mutations. Some of the symptoms you may experience include:
- Physical features such as facial abnormalities, cleft palate, webbed fingers and toes, and short stature.
- Cognitive function problems and developmental delays.
- Vision or hearing impairment.
- Breathing difficulties.
- Increased risk of developing cancer.
Are all genetic mutations bad?
Here's something to keep in mind: Not all gene mutations lead to genetic diseases. Some gene mutations have no effect on your health. This is because, even though they are changes in the DNA sequence, they don't make a big difference to how the cell functions.
Our bodies have mechanisms that can repair these kinds of mutations. Our bodies have chemicals called enzymes. These enzymes can repair certain genetic mutations before they affect the functioning of a cell.
Surprisingly, some genetic mutations can even be beneficial to people! Yes, you heard right. Changes in the way cells function can sometimes lead to improved production of proteins that help cells adapt to changes in their environment. For example, a person who smokes or is obese may have a genetic mutation that helps protect them from heart disease or diabetes.
How do genetic mutations cause genetic variations?
A genetic mutation is when the sequence of a gene (DNA) changes and starts producing something different. This causes a permanent change in the sequence of that gene (DNA).
These genetic variations are very important for the evolution of the human race. Evolution refers to changes that occur over generations. Imagine, someone accidentally develops a genetic mutation. That genetic mutation is passed from that person to their children (that is, it is hereditary). This goes on for generations. If this mutation somehow increases the person's ability to survive, or if it frees them from disease, it spreads over generations and spreads throughout the population. As the mutation passes from generation to generation, it becomes a normal part of the human genome, evolving from a gene variant to a normal gene.
Where are our genes located?
Genes are found in our bodies in the form of thread-like structures called chromosomes. These chromosomes are found in every cell in our bodies. We have trillions of these cells that make you who you are.
What are the main types of genetic mutations?
Genetic mutations can be classified according to where they occur. There are two main types:
- Germline mutations: These are genetic changes that occur in the reproductive cells (eggs or sperm) of parents. These affect the genetic makeup of their child. This means that they are inherited (hereditary).
- Somatic mutations: These occur in the developing embryo after conception. They can occur in any cell of the developing embryo (except sperm and egg cells). Somatic mutations are not inherited from parents to children because traits are only inherited from sperm and egg cells.
Can we inherit genetic mutations? (Inheritance)
Yes, we can inherit those germline mutations mentioned earlier. But somatic mutations occur randomly, without any family history. There are several hereditary patterns of genetic mutations that a child inherits from their parents.
Some of the main inherited patterns:
- Autosomal dominant: In this, the child inherits the gene mutation even if only one parent inherits it. An example is Marfan syndrome.
- Autosomal recessive: In this, the child will only inherit the mutation if both parents inherit the same gene mutation . Sickle cell disease is an example of this.
- X-linked dominant: Children have one X chromosome. If a mutation on the X chromosome is passed from one parent to the child, the child will inherit that mutation. Fragile X syndrome is a disease inherited in this way.
- X-linked recessive: If only the father has the mutation, there is a 100% chance that daughters will be carriers, and sons will not be affected. If only the mother has the mutation, there is a 50% chance that daughters will be carriers and sons will have the disease. If both parents have the mutation, 50% of sons will have the disease, and 100% of daughters will inherit the mutation. An example of this is colour blindness.
- X-linked: Mutations on the X chromosome can be inherited as either a dominant or recessive trait, but not all patterns are clear as to how a child received the mutation from their parents. Thrombocytopenia is a condition that is inherited in this way.
- Y-linked: Only males have the Y chromosome, so it is inherited only by males. When a mutation on the Y chromosome is passed on to a child, it is inherited. Webbed toes are an example of this.
- Codominant: Each gene has two parts (one from the egg, the other from the sperm). Usually, both of them work together to produce a single trait. But sometimes, both work separately to produce different versions of that trait. Alpha-1 antitrypsin deficiency is an example of this.
- Mitochondrial: Mitochondria are the energy-producing parts of a cell. When two cells fuse, that is, during fertilization, only the mitochondria in the egg survive. Therefore, all of the maternal DNA in the embryo comes from the egg. This is why mitochondrial inheritance is also called maternal inheritance. Leber hereditary optic neuropathy (sudden loss of vision) is an inherited condition in this way.
What are Genetic Disorders?
A genetic disease is a condition caused by changes in your genome, which is a person's genetic material. This includes your DNA, genes, and chromosomes.
Causes of genetic diseases:
- A mutation in a single gene (monogenic `(monogenic)`).
- Mutations in several genes (multifactorial inheritance).
- Mutations in one or more chromosomes.
- Environmental factors (such as exposure to chemicals, UV rays) change your genetic makeup.
You can inherit this genetic condition from your parents (that is, if it is present in the DNA of sperm or egg cells), or it can occur randomly without a family history of genetic diseases.
Some common genetic disorders:
- Alzheimer's disease
- Some types of cancer
- Cystic fibrosis
- Down syndrome
- Sickle cell disease
Are there tests to check for genetic mutations?
If your doctor suspects that you have a genetic condition, or if you are at risk of having a child with a genetic condition, he or she may suggest a genetic test . There are various genetic tests that require a sample of your blood, skin, hair, amniotic fluid, or tissue to detect changes in genes, chromosomes, or proteins. These tests can find out which genes or chromosomes are affected by the genetic condition. They can also tell you the risk of your child inheriting a genetic mutation if you are planning to have children.
What can we do to protect ourselves from genetic mutations and keep our genes healthy?
Some genetic mutations occur randomly, so we can't prevent them from occurring. However, some genetic mutations are caused by changes in our environment. Therefore, you can do these things to prevent some genetic mutations:
- Avoid smoking.
- Use sunscreen when going out in the sun.
- Avoid exposure to chemicals (especially carcinogens) or radiation (such as X-rays).
- Eat a nutritious, balanced diet. Avoid processed foods as much as possible.
Finally, things to remember (Take-Home Message)
Don't be afraid when you hear about genetic mutations. Not all mutations cause disease. Some of them don't harm us at all, and some of them can be good.
The important thing is that most of these things happen randomly. They can happen even without any history in your family.
If you are expecting a baby and want to know about your genetic risk, don't hesitate to talk to your doctor and learn more about genetic testing. Living a healthy lifestyle and avoiding unnecessary risks are very important for the health of our genes.
` Genetic Mutations, DNA, Genes, Cell Division, Mitosis, Meiosis, Genetic Diseases, Inheritance, Genetic Testing, Chromosomes
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