Roles of Introns in DNA:

1. Introns, previously thought of as useless DNA, have significant functions in controlling gene expression. They enable alternative splicing, enabling one gene to create various proteins, thus enhancing protein variety without increasing genome size.

2. In addition, introns play a role in regulating genes by containing elements that impact how genes are expressed. They have the ability to impact mRNA stability and transportation, which guarantees proper and timely synthesis of proteins.

3. Introns play a role in evolution by offering opportunities for genetic recombination and mutation, potentially resulting in the development of novel gene functions.

4. Their existence in DNA highlights the intricate nature of genomic regulation and the advanced methods of controlling gene expression.