How does a frameshift mutation typically affect a protein?

How does a frameshift mutation typically affect a protein?

• A. It usually has no effect on the protein
• B. It alters the reading frame of the genetic code
• C. It stabilizes the amino acid sequence
• D. It simply adds extra amino acids

Answer: (B)

A frameshift mutation typically affects a protein by altering the reading frame of the genetic code. This type of mutation occurs when nucleotides are inserted into or deleted from the DNA sequence in numbers that are not multiples of three. Since the genetic code is read in triplets (codons), the addition or removal of nucleotides shifts the entire downstream sequence. As a result of this shift, every subsequent codon after the mutation can potentially code for completely different amino acids, drastically changing the structure and function of the resulting protein. This often leads to the production of a protein that is nonfunctional or has significantly altered activity due to the disruption of the normal amino acid sequence. The extent of the impact on the protein can vary, but a frameshift mutation generally leads to serious consequences, possibly including the creation of a premature stop codon that truncates the protein. In contrast, other options like having no effect or simply adding extra amino acids do not accurately capture the significant impact of a frameshift mutation on protein synthesis. Insertion or deletion of nucleotides has a profound effect, particularly when it disrupts the reading frame.

A frameshift mutation typically affects a protein by altering the reading frame of the genetic code. This type of mutation occurs when nucleotides are inserted into or deleted from the DNA sequence in numbers that are not multiples of three. Since the genetic code is read in triplets (codons), the addition or removal of nucleotides shifts the entire downstream sequence.

As a result of this shift, every subsequent codon after the mutation can potentially code for completely different amino acids, drastically changing the structure and function of the resulting protein. This often leads to the production of a protein that is nonfunctional or has significantly altered activity due to the disruption of the normal amino acid sequence. The extent of the impact on the protein can vary, but a frameshift mutation generally leads to serious consequences, possibly including the creation of a premature stop codon that truncates the protein.

In contrast, other options like having no effect or simply adding extra amino acids do not accurately capture the significant impact of a frameshift mutation on protein synthesis. Insertion or deletion of nucleotides has a profound effect, particularly when it disrupts the reading frame.