Genetic and environment factors of mental disorders: Twin studies about Alzheimer’s disease, Phobia and Autism Spectrum Disorder

Abstract

With the natural and social environment changing, people’s mental health is facing severe challenges. Many people are suffering from mental disorders in the present day. A large part of mental disorders can be linked with the nerve system. And nerve system disorders tend to be associated with the development of nerve systems. The gene and the environment can play an important role in the development of the body, and abnormal genes and detrimental environmental factors can contribute a lot to nerve system disorders. Previous research has studied the occurrence and gene-and-environmental impact of many nerve system disorders. Among them, this essay chooses three kinds of disorders: Alzheimer’s disease (AD), Phobia, and Autism Spectrum Disorder, which can cause a lot of trouble in people’s daily life. In this essay, we are to study the occurrence of some nerve systems’ disorders and hope to study the genetic and environmental contribution of these disorders. These three disorders gain a lot of attention as they are very common, and they can partly reflect the contribution of genes and the environment.