Effect of BDNF val(66)met polymorphism on declarative memory and its neural substrate: a meta-analysis

Area of Science:

• Neuroscience
• Genetics
• Cognitive Psychology

Background:

• Brain-derived neurotrophic factor (BDNF) is crucial for memory formation.
• Genetic variations in BDNF, like the rs6265 (val66met) polymorphism, may influence memory and hippocampal function.
• Previous studies show inconsistent results, possibly due to small sample sizes.

Purpose of the Study:

• To meta-analytically investigate the impact of the BDNF val66met polymorphism on human memory.
• To examine the association between the BDNF val66met polymorphism and hippocampal structure and physiology.

Main Methods:

• A meta-analysis was conducted on data from 5922 subjects for memory performance.
• Hippocampal structure and physiology were analyzed in 2985 and 362 subjects, respectively.
• The rs6265 (val66met) single nucleotide polymorphism (SNP) in the BDNF gene was the focus.

Main Results:

• The BDNF rs6265 SNP significantly affects memory performance.
• Carriers of the met allele show adverse effects on memory.
• The polymorphism also impacts hippocampal structure and physiology, with met allele carriers negatively affected.

Conclusions:

• BDNF genetic variations influence individual differences in memory.
• The rs6265 SNP plays a role in moderating human memory performance.
• These findings may help explain neurocognitive impairments in neuropsychiatric disorders.