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Ablation of de novo DNA methyltransferase Dnmt3a in the nervous system leads to neuromuscular defects and shortened lifespan
Author(s) -
Nguyen Suzanne,
Meletis Konstantinos,
Fu Dongdong,
Jhaveri Sonal,
Jaenisch Rudolf
Publication year - 2007
Publication title -
developmental dynamics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.634
H-Index - 141
eISSN - 1097-0177
pISSN - 1058-8388
DOI - 10.1002/dvdy.21176
Subject(s) - biology , neuromuscular junction , epigenetics , nervous system , dna methylation , dnmt3b , central nervous system , neuroscience , dna methyltransferase , microbiology and biotechnology , gene , genetics , gene expression
Abstract 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. Developmental Dynamics 236:1663–1676, 2007. © 2007 Wiley‐Liss, Inc.