What are the genetic changes related to branchio-oculo-facial syndrome ?
Branchio-oculo-facial syndrome is caused by mutations in the TFAP2A gene. This gene provides instructions for making a protein called transcription factor AP-2 alpha (AP-2). As its name suggests, this protein is a transcription factor, which means it attaches (binds) to specific regions of DNA and helps control the activity of particular genes. Transcription factor AP-2 regulates genes that are involved in several cellular processes, such as cell division and the self-destruction of cells that are no longer needed (apoptosis). This protein is critical during development before birth, particularly of the branchial arches, which form the structures of the face and neck.  Most TFAP2A gene mutations that cause branchio-oculo-facial syndrome change single protein building blocks (amino acids) in the transcription factor AP-2 protein. These changes tend to occur in a region of the protein that allows it to bind to DNA. Without this function, transcription factor AP-2 cannot control the activity of genes during development, which disrupts the development of the eyes, ears, and face and causes the features of branchio-oculo-facial syndrome.