<unk>  is caused by the deletion of the most distal light band of the short arm of chromosome 1. Human chromosome 1 The breakpoints for<unk>  have been variable and are most commonly found from<unk> .13 to<unk> .33. 40 percent of all breakpoints occur 3 to 5 million base pairs from the telomere. The size of the deletion ranges from approximately 1.5 million base pairs to greater than 10 million. Most deletions in chromosome<unk>  are de novo mutations. 20% of patients with<unk>  inherit the disease from one parent who carries a balanced or symmetrical translocation.
1p36 deletion syndrome
2q37 deletion syndrome
13q deletion syndrome
22q13 deletion syndrome
22q11.2 distal deletion syndrome
1q21.1 deletion syndrome
9q34 deletion syndrome
17q12 microdeletion syndrome