Kleefstra syndrome

Definition:

Kleefstra syndrome (KLEFS), also known as the 9q subtelomeric deletion syndrome is characterized by intellectual disability, childhood hypotonia, and distinctive facial features. About 75% of Kleefstra syndrome is caused by microdeletion of 9q34.3 and 25% by intragenic EHMT1 mutation. Recently, a few patients with loss of function mutations affecting the histone methyltransferase KMT2C were reported.

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