Acute Brain-Derived Neurotrophic Factor DNA Methylation Trajectories in Cerebrospinal Fluid and Associations With Outcomes Following Severe Traumatic Brain Injury in Adults.
Amery Treble-Barna, Lacey W Heinsberg, Ava M Puccio and 5 others
PMID 34167372WHAT IT FOUND
In severe traumatic brain injury, higher DNA methylation of the BDNF gene in spinal fluid was linked to better outcomes at 3 and 12 months.
This association was suggestive only and did not meet strict significance thresholds after correcting for multiple tests.
Key findings
01Participants in the high DNA methylation trajectory group had consistently better outcomes at 3 and 12 months compared to those in the low methylation group.
02No observed associations met the empirical significance threshold computed using permutation testing.
03Higher age was associated with worse outcomes in the low methylation group, while the high methylation group maintained similar or better outcomes despite older age.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study was a small pilot with only 112 participants, limiting the ability to detect robust effects or examine injury heterogeneity. All results were suggestive (p < .05) but failed to meet the empirical significance threshold after correction for multiple testing, meaning the findings are not statistically confirmed. Associations disappeared when adjusting for cell-type heterogeneity in the spinal fluid, suggesting the observed effects may be driven by blood contamination rather than brain-specific changes. The sample was homogeneous, with all participants reporting White race, limiting generalizability. This is a biomarker study; it does not test an intervention or treatment.
The easy way to misread this
Do not interpret these results as evidence that BDNF methylation levels can currently predict patient outcomes or guide treatment decisions. The associations were suggestive but did not survive statistical correction for multiple tests, and the effect vanished when accounting for cell-type differences in the spinal fluid.