Loss and gain of Drosophila TDP-43 impair synaptic efficacy and motor control leading to age-related neurodegeneration by loss-of-function phenotypes
| Autor: | Iain M. Robinson, Alan Stepto, Lies Vanden Broeck, Patrick Callaerts, Ben Sutcliffe, Zoe N. Ludlow, Christopher Shaw, Dickon M. Humphrey, Frank Hirth, Christopher J. H. Elliott, Bart Dermaut, Ammar Al-Chalabi, Danielle Diaper, Yoshitsugu Adachi |
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| Rok vydání: | 2013 |
| Předmět: |
EXPRESSION
Genetically modified mouse Aging PROTEINS Neuromuscular Junction NUCLEIC-ACID BINDING Neurotransmission Biology Synaptic Transmission AMYOTROPHIC-LATERAL-SCLEROSIS Neuromuscular junction Animals Genetically Modified Genetics medicine Animals WILD-TYPE Amyotrophic lateral sclerosis Molecular Biology Genetics (clinical) Loss function TRANSGENIC MICE Neurons FRONTOTEMPORAL LOBAR DEGENERATION Gene knockdown MUTATIONS Amyotrophic Lateral Sclerosis Neurodegeneration Biology and Life Sciences Articles General Medicine Frontotemporal lobar degeneration medicine.disease Cell biology DNA-Binding Proteins Disease Models Animal Drosophila melanogaster Phenotype medicine.anatomical_structure Larva Nerve Degeneration ALS Frontotemporal Lobar Degeneration MESSENGER-RNA |
| Zdroj: | Human Molecular Genetics HUMAN MOLECULAR GENETICS |
| ISSN: | 1460-2083 0964-6906 |
| DOI: | 10.1093/hmg/ddt005 |
| Popis: | Cytoplasmic accumulation and nuclear clearance of TDP-43 characterize familial and sporadic forms of amyotrophic lateral sclerosis and frontotemporal lobar degeneration, suggesting that either loss or gain of TDP-43 function, or both, cause disease formation. Here we have systematically compared loss- and gain-of-function of Drosophila TDP-43, TAR DNA Binding Protein Homolog (TBPH), in synaptic function and morphology, motor control, and age-related neuronal survival. Both loss and gain of TBPH severely affect development and result in premature lethality. TBPH dysfunction caused impaired synaptic transmission at the larval neuromuscular junction (NMJ) and in the adult. Tissue-specific knockdown together with electrophysiological recordings at the larval NMJ also revealed that alterations of TBPH function predominantly affect pre-synaptic efficacy, suggesting that impaired pre-synaptic transmission is one of the earliest events in TDP-43-related pathogenesis. Prolonged loss and gain of TBPH in adults resulted in synaptic defects and age-related, progressive degeneration of neurons involved in motor control. Toxic gain of TBPH did not downregulate or mislocalize its own expression, indicating that a dominant-negative effect leads to progressive neurodegeneration also seen with mutational inactivation of TBPH. Together these data suggest that dysfunction of Drosophila TDP-43 triggers a cascade of events leading to loss-of-function phenotypes whereby impaired synaptic transmission results in defective motor behavior and progressive deconstruction of neuronal connections, ultimately causing age-related neurodegeneration. |
| Databáze: | OpenAIRE |
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