Ablation of de novo DNA methyltransferase Dnmt3a in the nervous system leads to neuromuscular defects and shortened lifespan
| Autor: | Konstantinos Meletis, Suzanne Nguyen, Sonal Jhaveri, Rudolf Jaenisch, Dongdong Fu |
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| Rok vydání: | 2007 |
| Předmět: |
Nervous system
Time Factors Hypoglossal nucleus Diaphragm Longevity Nerve Tissue Proteins Biology Methylation Nervous System DNA methyltransferase DNA Methyltransferase 3A Nestin Mice Intermediate Filament Proteins medicine Animals DNA (Cytosine-5-)-Methyltransferases Epigenetics Cell Proliferation Mice Knockout Genetics Regulation of gene expression Behavior Animal Integrases Body Weight Gene targeting Neuromuscular Diseases Cell biology Motor coordination medicine.anatomical_structure Organ Specificity Mutation embryonic structures DNA methylation Gene Deletion Developmental Biology |
| Zdroj: | Developmental Dynamics. 236:1663-1676 |
| ISSN: | 1097-0177 1058-8388 |
| DOI: | 10.1002/dvdy.21176 |
| Popis: | DNA methylation is an epigenetic mechanism involved in gene regulation and implicated in the functioning of the nervous system. The de novo DNA methyltransferase Dnmt3a is expressed in neurons, but its specific role has not been clarified. Dnmt3a is activated around embryonic day 10.5 in mouse neuronal precursor cells and remains active in postmitotic neurons in the adult. We assessed the role of neuronal Dnmt3a by conditional gene targeting. Mice lacking functional Dnmt3a in the nervous system were born healthy, but degenerated in adulthood and died prematurely. Mutant mice were hypoactive, walked abnormally, and underperformed on tests of neuromuscular function and motor coordination. Loss of Dnmt3a also led to fewer motor neurons in the hypoglossal nucleus and more fragmented endplates in neuromuscular junctions of the diaphragm muscle. Our results implicate a role for Dnmt3a in the neuromuscular control of motor movement. |
| Databáze: | OpenAIRE |
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