Obsessive-Compulsive Disorder (OCD) is characterized by the presence of either obsessions or compulsions that cause Significant Distress to Afflicted individuals. Estimates of prevalence vary slightly across countries and symptom presentation depends on cultural and religious factors. Genetic factors account for 45-65% of OCD symptoms in patients diagnosed with the disorder. Environmental factors also Play Arolein How These Anxiety Symptoms Are expressed . Researchers found that relatives with the disorder possessed a difference in a gene called, SLC1A1, which is the glutamate transporter gene. They found that the discrepancy in the gene caused the flow of glutamine, in relation to brain cells, to happen much quicker for people with the disorder.