Single nucleotide polymorphism of BDNF Val66Met (rs6265) and its association to neuropsychiatric disorders

Authors

  • Asraa Faris (1) Department of Biological Sciences, Sunway University, Selangor, Malaysia. (2) Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Malaysia.
  • Pike-See Cheah (1) Molecular Neurogenetics Unit, Department of Neurology and Center for Molecular Imaging Research, Department of Radiology, Massachusetts General Hospital, and Program in Neuroscience, Harvard Medical School, Boston, Massachusetts, USA. (2) Department of Human Anatomy, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Malaysia.
  • King-Hwa Ling (1) Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Malaysia. (2) Department of Genetics, Harvard Medical School, Boston, Massachusetts, USA. https://orcid.org/0000-0002-3968-7263

DOI:

https://doi.org/10.31117/neuroscirn.v3i3.50

Keywords:

major depressive disorder, panic disorder, anxiety, post-traumatic stress disorder, obsessive-compulsive disorder, bipolar disorder, schizophrenia

Abstract

Brain-derived neurotrophic factor (BDNF) is the most abundant neurotrophin in the central nervous system and was shown to be involved in neuronal growth, differentiation and synaptic plasticity. A single nucleotide polymorphism at the pro-region of the BDNF gene (rs6265) has been reported to alter the amino acid from valine to methionine at codon 66 and was associated with neuropsychiatric disorders in several studies. To date, the results on the association of BDNF rs6265 to the aetiology of the neuropsychiatric illnesses have been inconsistent with some studies reporting a positive association and others reporting no association. Concerning the past inconsistent reports, this mini-review aims at determining the association of BDNF rs6265 and neuropsychiatric disorders among the different studies. Firstly, we discuss the findings on studies reporting the association of BDNF rs6265 with depression whereby a positive association between the BDNF variant and depression was obtained in several studies on the Caucasian, German, Chinese, and Malaysian population but not in studies on the Korean and other populations. Likewise, some studies found the occurrence of the SNP to be associated with a reduction in the BDNF level in depressed cases, but others found no effect at all. We then reported findings on the association of BDNF rs6265 with anxiety disorder, post-traumatic stress disorder, obsessive-compulsive disorder, panic disorder, bipolar disorder, and schizophrenia. Val allele has been found associated with these disorders, whereas some studies reported the involvement of the Met allele, and some reported no association at all. Similarly, the association of the BDNF variant with the BDNF level remains controversial. It is, therefore, essential to conduct more studies with larger sample sizes and look at the haplotype level to determine the association.

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2020-07-27

How to Cite

Faris, A., Cheah, P.-S. and Ling, K.-H. (2020) “Single nucleotide polymorphism of BDNF Val66Met (rs6265) and its association to neuropsychiatric disorders”, Neuroscience Research Notes, 3(3), pp. 9–26. doi: 10.31117/neuroscirn.v3i3.50.