Abstract
Background
Juvenile myoclonic epilepsy (JME) is characterized by altered patterns of brain functional connectivity (FC). However, the nature and extent of alterations in the spatiotemporal characteristics of dynamic FC in JME patients remain elusive. Dynamic networks effectively encapsulate temporal variations in brain imaging data, offering insights into brain network abnormalities and contributing to our understanding of the seizure mechanisms and origins.
Methods
Resting-state functional magnetic resonance imaging (rs-fMRI) data were procured from 37 JME patients and 37 healthy counterparts. Forty-seven network nodes were identified by group-independent component analysis (ICA) to construct the dynamic network. Ultimately, patients’ and controls’ spatiotemporal characteristics, encompassing temporal clustering and variability, were contrasted at the whole-brain, large-scale network, and regional levels.
Results
Our findings reveal a marked reduction in temporal clustering and an elevation in temporal variability in JME patients at the whole-brain echelon. Perturbations were notably pronounced in the default mode network (DMN) and visual network (VN) at the large-scale level. Nodes exhibiting anomalous were predominantly situated within the DMN and VN. Additionally, there was a significant correlation between the severity of JME symptoms and the temporal clustering of the VN.
Conclusions
Our findings suggest that excessive temporal changes in brain FC may affect the temporal structure of dynamic brain networks, leading to disturbances in brain function in patients with JME. The DMN and VN play an important role in the dynamics of brain networks in patients, and their abnormal spatiotemporal properties may underlie abnormal brain function in patients with JME in the early stages of the disease.
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Data availability
The datasets analyzed in the current study are available from the corresponding author upon reasonable request.
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Funding
This work was supported by a grant from the National Natural Science Foundation of China (grant numbers 61966023 and 82160326) and the Key Research and Development (R&D) Program Project of Gansu (grant numbers 22YF7FA089).
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MK, XL, and GL designed the experiment and revised the manuscript. MK and XL wrote the manuscript. GL recorded and collected the data. XL performed the data analysis. JZ and XR designed computer programs. YG designed computer programs and revised the manuscript. All authors contributed to this article and approved the version submitted.
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This study was approved by the Medical Research Ethics Committee of the Lanzhou University Second Hospital (No. 2019A-102). All individuals understood the purpose and latent risks and signed informed consent.
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Ke, M., Luo, X., Guo, Y. et al. Alterations in spatiotemporal characteristics of dynamic networks in juvenile myoclonic epilepsy. Neurol Sci (2024). https://doi.org/10.1007/s10072-024-07506-8
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DOI: https://doi.org/10.1007/s10072-024-07506-8