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• W57643623 abstract "Genetic studies of children with mental retardation Saideh Rajaei Department of Medical and Clinical Genetics, Institute of Biomedicine The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden, 2013 Mental retardation (MR) is characterised by significant limitations in intellectual function and adaptive behaviour. It is estimated that MR affects up to 3% of the population in Europe. Patients with MR are an aetiologically heterogeneous group. Approximately 25-35% of the patients have a genetic diagnosis. In the last decade, the introduction of molecular karyotyping has proved to add new and important data for MR diagnosis. In this thesis, we have undertaken extensive genetic analysis for two groups of children with MR. In the first study, a group of fourteen clinically diagnosed early infantile onset Rett Syndrome patients were included. The aim for this patient group was to identify possible pathogenic genetic variations. The second study was population-based and included children (born 1987–1998; 46 000 children) living in the Swedish County of Halland in 2004. 133 patients with SMR were identified and then divided in four categories depending on timing of onset; prenatal, perinatal, postnatal and undetermined timing. 23 patients within the prenatal group (included 82 patients in total), were still undiagnosed. The aims were; firstly to investigate whether the aetiological prevalence and co-morbidity of SMR, as well as the male: female ratio in Scandinavia had changed over time. Secondly, to investigate the impact of new genetic methodology, like molecular karyotyping, on the number of diagnosed children with SMR. In the early infantile onset RTT patients we found a MECP2 deletion (1/14) with the initial screening, and molecular karyotyping (SNP array) found three (3/14) copy number variations with uncertain significance. The SMR study showed the same prevalence as previous Scandinavian studies (2.9 per 1000). The molecular karyotyping resulted in diagnosis of 5/19 patients of the previously undiagnosed patients from the prenatal group, which increased the frequency of diagnosed patients from earlier 4% (using traditional analysis methods) to 22.5% (this study). Furthermore, we identified MECP2 duplication syndrome in a female patient with mild to moderate MR and two brothers from the SMR study. These results imply that MECP2 duplication is a pathogenic CNV in both genders, thus, there are phenotypic differences in females and males. Risk for recurrence is 50% for boys and less for girls because of incomplete penetrance. In conclusion, this thesis investigates the genetic causes of two specific groups of patients with mental retardation. This follow up is essential for prognosis, management, and genetic counselling which permit prenatal diagnosis and determination of recurrence risk." @default.
• W57643623 created "2016-06-24" @default.
• W57643623 creator A5016284228 @default.
• W57643623 date "2013-02-20" @default.
• W57643623 modified "2023-09-27" @default.
• W57643623 title "Genetic studies of children with mental retardation" @default.
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