Define the genes and protine expration …

A gene is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions to make molecules called proteins.  Alleles are forms of the same gene with small differences in their sequence of DNA bases.

Synucleins are abundant brain proteins whose physiological functions are only poorly understood. The human synuclein family consists of three members – α-synuclein, β-synuclein, and γ-synuclein – which range from 127 to 140 amino acids in length and are 55–62% identical in sequence, with a similar domain organization. Human brain development is created through continuing complex interactions of genetic and environmental influences.  Twin studies in adults have found that many aspects of brain anatomy are highly heritable, demonstrating that genetic factors provide a significant contribution to variation in brain structures.