Kleefstra Syndrome – case report

Kleefstra Syndrome is a rare genetic neurodevelopmental disorder characterized by the presence of multiple congenital defects. Patients present a large variety of clinical symptoms: delay in psychomotor and speech development, intellectual disability, muscular hypotension and characteristic facial dysmorphic features. The cause of the syndrome is submicroscopic deletion in the chromosomal region 9q34.3 or an intragenic mutation of the euchromatin histone methyltransferase 1 (EHMT1) gene. Early diagnosis is extremely important for children and their families as it allows quick implementation of appropriate therapeutic management and comprehensive care, which has a great impact on improving the quality of life and prognosis for patients with Kleefstra syndrome. We present the case of a 9-year-old girl with Kleefstra Syndrome in whom the diagnosis of the genetic syndrome was proved at the age of 2 years by chromosome analysis using CGH, which showed deletion in the terminal band 9q34.3 of the long arm of chromosome 9.