Many genes have been tested for their implication in the genetic
susceptibility for schizophrenia over the last 2 decades; however
no studies have found a single gene unambiguously linked to dysfunction
leading to schizophrenia. Genotyping of single nucleotide polymorphisms (SNPs) is the most common technique used to
measure genetic variation between members of a species. SNPs are
defined as the change in a single base pair, or a pointmutation with in
a DNA strand, occurring in both coding and non-coding regions of the
genome; they are the most frequently occurring type of genetic variation,
accounting for 90–95% of DNA sequence variation within a
population.