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Autism Spectrum Disorders (ASD) are neurodevelopment disorders that vary in severity and impair the social interaction, communication and behavior of sufferers. The prevalence is very high in the population and an elucidation of the causes, which are still not well understood in most cases, has implications in the clinical practice. This etiological complexity has encouraged many investigations that have identified loci related to susceptibility, chromosomal alterations and associations with other medical conditions, as well as the action of environmental aspects. Among proposed genetic alterations are deletions in the chromosome regions 2q37 and 22q13.3. The aims of this study were to perform a genetic-clinical investigation of 71 individuals with ASD as well as studies using karyotyping by GTG banding, Fluorescent in situ hybridization (FISH), probes D2S447 and N85A3, of the 2q37 and 22q13.3 subtelomeric regions and of the FMR1 gene mutation using molecular techniques. Of the participating individuals, eight (11.3%) presented with other associated medical conditions: one (1.4%) had a chromosomal aberration (syndrome do 5q-), three (4.22%) had associated genetic conditions (Fragile X syndrome, Soto’s syndrome and Van der Woude syndrome) and four (5.63%) had environmental-related anomalies [congenital rubella syndrome, fetal alcohol syndrome – 2 cases and neonatal anoxia]. None of the individuals presented with alterations in the 2q37 and 22q13.3 regions. This is the first description of associations of ASD with 5qsyndrome and also ASD with Van der Woude syndrome. The results demonstrate the importance of screening in these individuals to identify the presence of associated genetic diseases or environmental factors due to the variety of biological mechanisms involved that can be elucidated and because of the implications on the prognosis, therapy and on genetic counseling of families. The introduction of the analysis of specific regions such as 2q37 and 22q13.3 in the routine genetic investigation protocol of individuals with ASD does not seem to be necessary.

Estudo citogenético, regiões 2q37e 22q13.3 e condições médicas em doenças do espectro autístico