Causes of autism genetic environmental or both identifying causes of autism has been really a big challenge for the researchers scientists and medical professionals have struggled to understand the exact causes of autism for many years it is widely accepted that autism is a neurodevelopmental disorder marked by abnormalities in brain . The aim of this review is to summarize the key findings from genetic and epidemiological research which show that autism is a complex disorder resulting from the combination of genetic and environmental factors remarkable advances in the knowledge of genetic causes of autism have resulted from the . The role of environmental factors in the development of autism is a crucial area of study we know that genetics strongly influence the risk for developing autism spectrum disorder asd however genetics alone do not account for all instances of autism. There is no breakthrough or single gene that is a major new cause of autism but the role of genetics becomes even more evident when these single base changes are considered for instance an individual with autism is nearly 6 fold more likely to have a functional variant in genes expressed in the brain
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