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The causative variants of amyloidosis in the autism

Abstract Purpose: Autism spectrum disorders (ASD) consist of a group of neurodevelopmental disorders that include autistic behavior, Asperger’s syndrome and pervasive developmental disabilities. According to the increasing observations that patients with mitochondrial disorders have symptoms associated with ASD, we have aimed to analyze the role of mitochondrial DNA (mtDNA) variation in autistic patients. Material and methods: We selected children with autistic behaviors (15–60 CARS Score). The mitochondrial DNA extraction process was done by GeNet Bio DNA extraction kit. The regions of interest were amplified using independent PCR runs. After purification of PCR products, both strands were sequenced by Big Dye Termination system in a directly determined automated sequencing on an ABI 3700 capillary sequencer machine using both primers. All sequencing results were analyzed using bioinformatics’ tools sequencher software 5. Results: In this study, 31 samples were examined, which 15 unique variants were detected in genes related to COXI-III. The most frequent variant (30.76%) were related to COX1 with amino acid change A → A. The only significant pathogenic variant was C8264G, except for C8264G, all variants seemed to be homoplasmic substitution. Conclusion: In our study, among the variations we found, one variant what probably had an interesting association with possible amyloidosis, had been reported in patient with autism previously. It is hoped that with finding more definable genetic and biological markers, the autistic children diagnosis and treatment will be more effective.