Abstract
The brain-derived neurotrophic factor (BDNF) has many important roles in neurogenesis and neuronal health. BDNF is also involved in learning and memory. Individuals with BDNF-Val66Met variant (Met +) are at higher risk for neuropsychiatric disorders and have smaller hippocampi and amgydalae compared to those without this variant (Met −). Whether these smaller brain volumes are already present at birth is unknown and were evaluated. 66 newborn infants were genotyped for BDNF-rs6265 and had brain MRI scans. The T1-weighted images were automatically parcellated for hippocampus and amygdala, as well as the intracranial volume (ICV), total brain volume, total gray and white matter, using a multi-atlas label fusion method implemented in the MRICloud (https://braingps.anatomyworks.org). The segmented brain volumes were normalized to the ICV for group comparisons. The two infant groups were not different in their demographics and birth characteristics. However, compared to Met − infants, the Met + infants had smaller hippocampi (p = 0.013), smaller amygdalae (p = 0.041), and less steep age-related declines in total brain volume and % white matter volume. The smaller relative hippocampal and amygdala volumes in Met + infants suggest that the Met + genotype affected prenatal developmental processes. In addition, the slower age-dependent declines in the relative total brain and white matter volumes of the Met + group in this cross-sectional dataset suggest the BDNF-Val66Met variant might have an ongoing negative influence on the postnatal developmental processes.
Data availability
Data are available upon request to corresponding author.
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Acknowledgements
This publication was made possible by grants R01HD065955, 2K24DA16170, U54NS056883, and P41EB015909 from the National Institutes of Health. The contents of this paper are solely the responsibility of the authors and do not necessarily represent the official view of NIH. The authors are grateful to the families of our research participants, the referring pediatricians/neonatologists (Dr. Lillian Fujimoto, Dr. Lois Chiu, and Dr. Joseph Hudak), and our research staff (Steve Buchthal, Sara Hayama, Heather Johansen), who assisted with the data collection and data transfer. We also thank our board-certified Neuroradiologist, Dr. Doris Lin, for the radiological image reading.
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This publication was made possible by National Institutes of Health (Grants R01HD065955, 2K24DA16170, U54NS056883, and P41EB015909).
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429_2020_2207_MOESM2_ESM.jpg
Supplementary Figure. Scatterplots similar to those in Fig. 2 comparing the two subject groups (Met-: open circles, dotted lines; Met + : black circles, solid lines), are shown for the volumes in each brain regions assessed, except these were the actual measurements without normalization to ICV. All brain volumes, globally or regionally, showed the expected age-dependent increase across the PMA studied (JPG 150 KB)
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Kawasaki, Y., Oishi, K., Hernandez, A. et al. Brain-derived neurotrophic factor Val66Met variant on brain volumes in infants. Brain Struct Funct 226, 919–925 (2021). https://doi.org/10.1007/s00429-020-02207-2
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DOI: https://doi.org/10.1007/s00429-020-02207-2