An Observational Case-control Study for BDNF Val66Met Polymorphism and Serum BDNF in Patients with Major Depressive Disorder (MDD).

Background: The brain-derived neurotrophic factor (BDNF) has an important role in the growth of neurons and synaptic transmission. The BDNF gene Val66Met polymorphism (G/A) is associated with depression, but findings have not been consistently replicated. This study adopts a case-control design with an aim to investigate the association of Val66Met polymorphism and peripheral BDNF (serum) levels in patients of major depressive disorder (MDD) and healthy individuals (controls).