Quick Answer: What Occurs During Frameshift Mutation?

A frameshift mutation (also called a framing error or a reading frame shift) is a genetic mutation caused by indels (insertions or deletions) of a number of nucleotides in a DNA sequence that is not divisible by three.

The earlier in the sequence the deletion or insertion occurs, the more altered the protein.

What is the result of a frameshift mutation?

A frameshift mutation is a genetic mutation caused by a deletion or insertion in a DNA sequence that shifts the way the sequence is read. Therefore, frameshift mutations result in abnormal protein products with an incorrect amino acid sequence that can be either longer or shorter than the normal protein.

Would a frameshift mutation have?

Frameshift Mutations. A frameshift mutation is a mutation caused by an insertion or deletion, which causes a shift in the translational reading frame. Instead of just changing one amino acid, frameshifts cause a change in all the amino acids in the rest of the gene.

Is Sickle Cell Anemia a frameshift mutation?

The protein may lose its function, which can result in a disease in the organism. For example, sickle-cell disease is caused by a single point mutation (a missense mutation) in the beta-hemoglobin gene that converts a GAG codon into GUG, which encodes the amino acid valine rather than glutamic acid.

How does insertion mutation occur?

An insertion mutation is a permanent change in a DNA sequence caused by the addition of nucleotides. However, if the number of inserted nucleotides is not a multiple of three, then it is a frameshift mutation. Any insertion mutation that causes a nonfunctional protein could result in a disease.

What is an example of a mutation?

For example, sickle cell anemia is caused by a substitution in the beta-hemoglobin gene, which alters a single amino acid in the protein produced. change a codon to one that encodes the same amino acid and causes no change in the protein produced. These are called silent mutations.

What diseases are caused by frameshift mutations?


  • 3.1 Cancer.
  • 3.2 Crohn’s disease.
  • 3.3 Cystic fibrosis.
  • 3.4 HIV.
  • 3.5 Tay–Sachs disease.
  • 3.6 Smith–Magenis syndrome.
  • 3.7 Hypertrophic cardiomyopathy.
  • 3.8 Cures.

Are all mutations harmful?

Effects of Mutations

A single mutation can have a large effect, but in many cases, evolutionary change is based on the accumulation of many mutations with small effects. Mutational effects can be beneficial, harmful, or neutral, depending on their context or location. Most non-neutral mutations are deleterious.

Where do frameshift mutations occur?

Frameshift Mutations

A frameshift mutation is produced either by insertion or deletion of one or more new bases. Since the reading frame begins at the start site, any mRNA produced from a mutated DNA sequence will be read out of frame after the point of the insertion or deletion, yielding a nonsense protein.

What are the 4 types of mutation?

There are three types of DNA Mutations: base substitutions, deletions and insertions.

  1. Base Substitutions. Single base substitutions are called point mutations, recall the point mutation Glu —–> Val which causes sickle-cell disease.
  2. Deletions.
  3. Insertions.

What happens when there is a mutation in DNA?

A mutation is a change that occurs in our DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors such as UV light and cigarette smoke. Over a lifetime our DNA? can undergo changes or ‘mutations?’ in the sequence of bases?, A, C, G and T.

What are the main causes of mutations?

Mutations arise spontaneously at low frequency owing to the chemical instability of purine and pyrimidine bases and to errors during DNA replication. Natural exposure of an organism to certain environmental factors, such as ultraviolet light and chemical carcinogens (e.g., aflatoxin B1), also can cause mutations.

What is the mutation that causes sickle cell anemia?

Sickle cell disease is caused by a mutation in the hemoglobin-Beta gene found on chromosome 11. Hemoglobin transports oxygen from the lungs to other parts of the body. Red blood cells with normal hemoglobin (hemoglobin-A) are smooth and round and glide through blood vessels.

What are the effects of insertion mutation?

This type of mutation results in a shortened protein that may function improperly or not at all. Insertion. An insertion changes the number of DNA bases in a gene by adding a piece of DNA. As a result, the protein made by the gene may not function properly.

What is another name for insertion mutation?

In genetics, an insertion (also called an insertion mutation) is the addition of one or more nucleotide base pairs into a DNA sequence. Trinucleotide repeats are classified as insertion mutations and sometimes as a separate class of mutations.

When can insertion mutations occur?

Insertions and deletions

An insertion mutation occurs when an extra nucleotide is added to the DNA strand during replication. This can happen when the replicating strand “slips,” or wrinkles, which allows the extra nucleotide to be incorporated (Figure 2).