Genetics in Learning and Memory

This chapter discusses the applications of genetic approaches to dissect the processes of learning and memory in Drosophila melanogaster and to exemplify the role of genetics in learning and memory research. Since centuries, heredity has been taken as a factor that is responsible for learning and memory. Experiments in the mid-twentieth century established the genetic components involved in the process of learning and memory. When the application of genetics in studying learning and memory was started at the California Institute of Technology, the single-gene mutant approach t was applied to the field of Drosophila behavioral genetics in the early 1970s. Genetic screening for learning and memory mutants in Drosophila melanogaster was carried out. Although this approached faced skepticism initially, later on, it led to some fundamental insights into the mechanisms of learning and memory. The findings in Drosophila in combination with the studies of Aplysia helped in identifying the cAMP-mediated signal transduction as a central pathway for learning and memory. Through modern techniques of genetics, many genes involved in learning and memory have been discovered in Drosophila, which have significantly helped in the understanding of learning and memory mechanisms. Genetic tools provide powerful means to study learning and memory. Genetic screening has enabled unbiased discovery of gene mutations that affect learning and memory. The identification of these genes and subsequent reverse-genetics manipulation has allowed the dissection of learning and memory at the molecular, synaptic, and systems levels.