Adenosine to inosine (A to I) editing is a post-transcriptional modification process where specific adenosine nucleotides in RNA are deaminated to form inosine. This modification is catalyzed by a family of enzymes known as adenosine deaminases acting on RNA (ADARs). Inosine is often read as guanosine by the cellular machinery, leading to potential changes in the coding sequence, splicing, and other aspects of RNA function.