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Cereb Cortex. 2020 Mar 7. pii: bhaa009. doi: 10.1093/cercor/bhaa009. [Epub ahead of print]

DNA Methylation-Mediated Modulation of Endocytosis as Potential Mechanism for Synaptic Function Regulation in Murine Inhibitory Cortical Interneurons.

Author information

1
Institute of Human Genetics, University Hospital Jena, 07743 Jena, Germany.
2
Division of Functional Epigenetics, Institute of Zoology (Biology 2), RWTH Aachen University, 52074 Aachen, Germany.
3
Research Training Group 2416 Multi Senses-Multi Scales, RWTH Aachen University, 52074 Aachen, Germany.
4
Department of Neuropathology, Section for Translational Epilepsy Research, University of Bonn Medical Center, 53105 Bonn, Germany.
5
Division of Systems Neurophysiology, Institute of Zoology (Biology 2), RWTH Aachen University, 52074 Aachen, Germany.
6
Department of Developmental Biochemistry, Transcriptome and Genome Analysis Laboratory (TAL), University of Goettingen, 37077 Goettingen, Germany.
7
Clinic for Neurology, University Hospital Jena, 07743 Jena, Germany.
8
Institute for Computational Genomics, University Hospital Aachen, RWTH Aachen University, 52074 Aachen, Germany.
9
Department of Developmental Biochemistry, Centre for Nanoscale Microscopy and Molecular Physiology of the Brain (CNMPB), University of Goettingen, 37077 Goettingen, Germany.
10
Clinic for Neurosurgery, University of Bonn Medical Center, 53105 Bonn, Germany.
11
JARA BRAIN, Institute for Neuroscience and Medicine, Forschungszentrum Jülich, 52425, Germany.

Abstract

The balance of excitation and inhibition is essential for cortical information processing, relying on the tight orchestration of the underlying subcellular processes. Dynamic transcriptional control by DNA methylation, catalyzed by DNA methyltransferases (DNMTs), and DNA demethylation, achieved by ten-eleven translocation (TET)-dependent mechanisms, is proposed to regulate synaptic function in the adult brain with implications for learning and memory. However, focus so far is laid on excitatory neurons. Given the crucial role of inhibitory cortical interneurons in cortical information processing and in disease, deciphering the cellular and molecular mechanisms of GABAergic transmission is fundamental. The emerging relevance of DNMT and TET-mediated functions for synaptic regulation irrevocably raises the question for the targeted subcellular processes and mechanisms. In this study, we analyzed the role dynamic DNA methylation has in regulating cortical interneuron function. We found that DNMT1 and TET1/TET3 contrarily modulate clathrin-mediated endocytosis. Moreover, we provide evidence that DNMT1 influences synaptic vesicle replenishment and GABAergic transmission, presumably through the DNA methylation-dependent transcriptional control over endocytosis-related genes. The relevance of our findings is supported by human brain sample analysis, pointing to a potential implication of DNA methylation-dependent endocytosis regulation in the pathophysiology of temporal lobe epilepsy, a disease characterized by disturbed synaptic transmission.

KEYWORDS:

DNMT1; GABA; TET; cortical inhibition; synaptic function; temporal lobe epilepsy

PMID:
32147726
DOI:
10.1093/cercor/bhaa009

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