If the sequence of bases in the DNA molecule is changed, it can result in a different sequence of amino acids in the protein. This can have a drastic impact on the function of the protein, or it can even prevent the protein from being produced at all. For example, if the codon AUG is mutated to UUG, the resulting protein will have a phenylalanine instead of a methionine at the start position. This could alter the structure and function of the protein.
The importance of the correct sequence of DNA bases in protein production can be seen in a number of genetic diseases. For example, the genetic disease sickle cell anaemia is caused by a single-base mutation in the DNA that encodes the beta-globin protein. This mutation results in the production of a defective beta-globin protein that causes the red blood cells to become sickle-shaped.
The importance of the correct sequence of DNA bases is not limited to protein production. It is also critical for other cellular processes, such as DNA replication and transcription.
