| Characterized by marked neonatal hypotonia, progressive quadriparesis, severely delayed developmental milestones (walking at 3 years of age), gastroesophageal reflux, and stereotypic movements of the hands, esotropia and infantile autism. It has been described in two related males, whereas female carriers were unaffected. Pericentric inversion inv(X)(q13;p22) has been identified it results in the absence of the product of the KIAA2022 gene, highly expressed in the brain. |