What is a possible result of a frameshift mutation?

A frameshift mutation occurs when nucleotides are inserted into or deleted from the genetic sequence in a number that is not a multiple of three. This disrupts the reading frame of the RNA sequence that is transcribed from the DNA. As a result, every codon following the mutation is altered, typically leading to a completely different sequence of amino acids and, consequently, a protein that is likely nonfunctional.

In this context, the outcome of a frameshift mutation is often a drastically modified protein structure, as the new amino acid sequence can significantly differ from the original. This can have serious implications for the protein's ability to perform its intended biological functions. Thus, the possibility of producing a completely different protein sequence is a direct and common consequence of a frameshift mutation.