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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Acta+Neuropathol
2015 ; 130
(1
): 49-61
Nephropedia Template TP
gab.com Text
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Low molecular weight species of TDP-43 generated by abnormal splicing form
inclusions in amyotrophic lateral sclerosis and result in motor neuron death
#MMPMID25788357
Xiao S
; Sanelli T
; Chiang H
; Sun Y
; Chakrabartty A
; Keith J
; Rogaeva E
; Zinman L
; Robertson J
Acta Neuropathol
2015[Jul]; 130
(1
): 49-61
PMID25788357
show ga
The presence of lower molecular weight species comprising the C-terminal region
of TAR DNA-binding protein 43 (TDP-43) is a characteristic of TDP-43
proteinopathy in amyotrophic lateral sclerosis (ALS) and frontotemporal lobar
degeneration (FTLD). Here, we have identified a novel splice variant of TDP-43
that is upregulated in ALS and generates a 35-kDa N-terminally truncated species
through use of an alternate translation initiation codon (ATG(Met85)), denoted
here as Met(85)-TDP-35. Met(85)-TDP-35 expressed ectopically in human
neuroblastoma cells exhibited reduced solubility, cytoplasmic distribution, and
aggregation. Furthermore, Met(85)-TDP-35 sequestered full-length TDP-43 from the
nucleus to form cytoplasmic aggregates. Expression of Met(85)-TDP-35 in primary
motor neurons resulted in the formation of Met(85)-TDP-35-positive cytoplasmic
aggregates and motor neuron death. A neo-epitope antibody specific for
Met(85)-TDP-35 labeled the 35-kDa lower molecular weight species on immunoblots
of urea-soluble extracts from ALS-FTLD disease-affected tissues and co-labeled
TDP-43-positive inclusions in ALS spinal cord sections, confirming the
physiological relevance of this species. These results show that the 35-kDa low
molecular weight species in ALS-FTLD can be generated from an abnormal splicing
event and use of a downstream initiation codon and may represent a mechanism by
which TDP-43 elicits its pathogenicity.