<unk>  is caused by deletion of genetic material from the long arm of chromosome 11. The size of deletion may vary across patients, but the deletion always occurs at the end terminal of the q arm of chromosome 11. There are three ways in which the deletion could occur: de novo deletion- this is a random event that occurred during the formation of the sperm or the egg or during the cell division in the embryonic stage, where genes from chromosome 11 get deleted. Imbalanced translocation- in this case, a parent with balanced translocation or other types of chromosomal rearrangement can pass on these genes to their children which further results in an imbalanced translocation. The affected children have deletions on chromosome 11 as well as some extra genetic material from another chromosome. Ring chromosome 11- in this case genetic material from both long and short arm of the chromosome get deleted, and the remaining part joins together and forms a ring like structure. Here the affected person would have symptoms associated with both 11q and 11p deletion.
Jacobsen syndrome
Senior–Løken syndrome
McGillivray syndrome
Mungan syndrome
Lelis syndrome
Sanjad-Sakati syndrome
Barakat-Perenthaler syndrome
Bart syndrome