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Epigenetics of autism spectrum disorders Schanen NCHum Mol Genet 2006[Oct]; 15 Spec No 2 (ä): R138-50The autism spectrum disorders (ASD) comprise a complex group of behaviorally related disorders that are primarily genetic in origin. Involvement of epigenetic regulatory mechanisms in the pathogenesis of ASD has been suggested by the occurrence of ASD in patients with disorders arising from epigenetic mutations (fragile X syndrome) or that involve key epigenetic regulatory factors (Rett syndrome). Moreover, the most common recurrent cytogenetic abnormalities in ASD involve maternally derived duplications of the imprinted domain on chromosome 15q11-13. Thus, parent of origin effects on sharing and linkage to imprinted regions on chromosomes 15q and 7q suggest that these regions warrant specific examination from an epigenetic perspective, particularly because epigenetic modifications do not change the primary genomic sequence, allowing risk epialleles to evade detection using standard screening strategies. This review examines the potential role of epigenetic factors in the etiology of ASD.|*Epigenesis, Genetic[MESH]|Autistic Disorder/*genetics[MESH]|Child[MESH]|Child Development Disorders, Pervasive/*genetics[MESH]|Chromosome Aberrations[MESH]|Chromosomes, Human, Pair 15/genetics[MESH]|Chromosomes, Human, Pair 7/genetics[MESH]|Chromosomes, Human, X/genetics[MESH]|Female[MESH]|Genomic Imprinting[MESH]|Humans[MESH]|Male[MESH]|Syndrome[MESH] |
