Deletion of the q11-13 region of the long arm of chromosome 15 causes either the Angelman or Prader-Willi syndrome. Angel-man syndrome is caused by deletion of the maternally derived chromosome 15, generally, bands q11.3 through q13. The syndrome is characterized by absent speech, seizures, and a puppetlike jerky gait. Prader-Willi syndrome is characterized by hypotonia, obesity with an onset in early childhood, hypogo-nadism, and small hands and feet; deletion of band q11.3 of the paternally derived chromosome 15 is the basis of the syndrome. In both, ocular hypopigmentation is evident.76,209,265
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