PMID- 29867348 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20201001 IS - 1662-5099 (Print) IS - 1662-5099 (Electronic) IS - 1662-5099 (Linking) VI - 11 DP - 2018 TI - Critical Issues in BDNF Val66Met Genetic Studies of Neuropsychiatric Disorders. PG - 156 LID - 10.3389/fnmol.2018.00156 [doi] LID - 156 AB - Neurotrophins have been implicated in the pathophysiology of many neuropsychiatric diseases. Brain-derived neurotrophic factor (BDNF) is the most abundant and widely distributed neurotrophin in the brain. Its Val66Met polymorphism (refSNP Cluster Report: rs6265) is a common and functional single-nucleotide polymorphism (SNP) affecting the activity-dependent release of BDNF. BDNF Val66Met transgenic mice have been generated, which may provide further insight into the functional impact of this polymorphism in the brain. Considering the important role of BDNF in brain function, more than 1,100 genetic studies have investigated this polymorphism in the past 15 years. Although these studies have reported some encouraging positive findings initially, most of the findings cannot be replicated in following studies. These inconsistencies in BDNF Val66Met genetic studies may be attributed to many factors such as age, sex, environmental factors, ethnicity, genetic model used for analysis, and gene-gene interaction, which are discussed in this review. We also discuss the results of recent studies that have reported the novel functions of this polymorphism. Because many BDNF polymorphisms and non-genetic factors have been implicated in the complex traits of neuropsychiatric diseases, the conventional genetic association-based method is limited to address these complex interactions. Future studies should apply data mining and machine learning techniques to determine the genetic role of BDNF in neuropsychiatric diseases. FAU - Tsai, Shih-Jen AU - Tsai SJ AD - Department of Psychiatry, Taipei Veterans General Hospital, Taipei, Taiwan. AD - School of Medicine, National Yang-Ming University, Taipei, Taiwan. AD - Institute of Brain Science, National Yang-Ming University, Taipei, Taiwan. LA - eng PT - Journal Article PT - Review DEP - 20180515 PL - Switzerland TA - Front Mol Neurosci JT - Frontiers in molecular neuroscience JID - 101477914 PMC - PMC5962780 OTO - NOTNLM OT - Val66Met polymorphism OT - age OT - brain-derived neurotrophic factor OT - environmental factors OT - ethnicity OT - genetic study OT - sex OT - transgenic mice EDAT- 2018/06/06 06:00 MHDA- 2018/06/06 06:01 PMCR- 2018/01/01 CRDT- 2018/06/06 06:00 PHST- 2018/02/23 00:00 [received] PHST- 2018/04/24 00:00 [accepted] PHST- 2018/06/06 06:00 [entrez] PHST- 2018/06/06 06:00 [pubmed] PHST- 2018/06/06 06:01 [medline] PHST- 2018/01/01 00:00 [pmc-release] AID - 10.3389/fnmol.2018.00156 [doi] PST - epublish SO - Front Mol Neurosci. 2018 May 15;11:156. doi: 10.3389/fnmol.2018.00156. eCollection 2018.