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  • Title: A structured assessment of motor function and behavior in patients with Kleefstra syndrome.
    Author: Schmidt S, Nag HE, Hunn BS, Houge G, Hoxmark LB.
    Journal: Eur J Med Genet; 2016 Apr; 59(4):240-8. PubMed ID: 26808425.
    Abstract:
    The present study aimed to further our understanding of Kleefstra syndrome, especially regarding motor function and behavioral characteristics. In total, four males and four females between two and 27 years of age with a genetically confirmed diagnosis of Kleefstra syndrome and their parents participated in this study. Four patients had 9q34.3 deletions that caused Euchromatin Histone Methyl Transferase 1 (EHMT1) haplo-insufficiency, and four patients harbored EHMT1 mutations. The motor function was evaluated via systematic observation. Standardized assessments such as the Vineland Adapted Behavior Scales II (VABS II), the Social Communication Questionnaire (SCQ) and the Child or Adult Behavior Checklist (CBCL, ABCL) were used for the behavioral assessment. All patients showed a delayed developmental status. Muscular hypotonia and its manifestations were present in all patients, regardless of their age. The mean values for all VABS II domains (communication, socialization, daily living skills, and motor skills) were significantly lower than the mean of the reference population (p < 0.001), but similar to other rare intellectual disabilities such as Smith-Magenis syndrome and Angelman syndrome. The results from the SCQ indicated that all patient values exceeded the cut-off value, suggesting the possibility of autism spectrum disorder. The behavioral and emotional problems assessed by CBCL and ABCL were less frequent. In conclusion, patients with Kleefstra syndrome present with a broad range of clinical problems in all age groups and are therefore in need of a multidisciplinary follow-up also after their transition into adulthood.
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