Overview
BDNF encodes a neurotrophic growth factor essential for the survival, growth, and differentiation of neurons. The Val66Met variant influences memory formation, learning, and the risk for neurological disorders.
11p14.1 (Chromosome 11)
Brain
Complex
Met allele ~20-30%
Function & Significance
BDNF is a key protein for neuroplasticity – the brain’s ability to adapt and change. It is important for:
- Neuronal Survival: Protects neurons from cell death
- Synaptic Plasticity: Strengthens connections between neurons
- Memory Formation: Long-term potentiation in the hippocampus
- Neurogenesis: Creation of new neurons
🧠 BDNF – “Fertilizer for the Brain”
BDNF is often referred to as “Miracle-Gro for the brain”:
- Hippocampus: Central for memory formation
- Prefrontal Cortex: Executive functions
- Amygdala: Emotional processing
Interesting Fact: Exercise increases BDNF levels by up to 300%!
🧬 Relevant SNPs
The Val66Met variant (rs6265):
11:27658369
/
Significance: Val66Met Polymorphism
• CC (Val/Val): Normal BDNF secretion, optimal memory
• TT (Met/Met): Reduced BDNF secretion, impaired episodic memory
• CT (Val/Met): Intermediate
🧠 Effects of the Met Variant
Met carriers (CT or TT) have:
- Smaller Hippocampal Volume: ~5% reduction
- Impaired Episodic Memory: Difficulty remembering events
- Poorer Working Memory: In complex tasks
- Increased Risk for:
- Depression (~1.5-fold)
- Alzheimer’s Disease
- Schizophrenia
- Bipolar Disorder
💪 Naturally Increase BDNF
Particularly important for Met carriers:
- Endurance Exercise: 30-60 min, 3-5x/week (strongest effect!)
- Strength Training: Also increases BDNF
- Meditation: Regular practice
- Omega-3 Fatty Acids: DHA from fish oil
- Intermittent Fasting: 16:8 method
- Adequate Sleep: 7-9 hours
- Social Interaction: Stimulates BDNF
- New Learning: Languages, instruments, skills
Important: These measures can compensate for the genetic disadvantage!
🎯 Positive Aspects of the Met Variant
Not everything is negative:
- Better Fear Extinction: Faster unlearning of fears
- Stronger Response to Antidepressants: Better response to SSRIs
- Higher Creativity: Found in some studies
📚 Data Sources
The information on this page is based on the following scientific sources:
- OMIM: #113505 – Online Mendelian Inheritance in Man
- dbSNP: rs6265 – SNP Database (NCBI)
- ClinVar: Clinical Variant Database (NCBI)
- PubMed: BDNF and Memory Research
- Nature Neuroscience: BDNF Function Studies
Last Update: February 2026
Biological Function
Associated Conditions
Analyzed Markers
Val66Met - TT(Met/Met): reduced hippocampus volume, impaired episodic memory