XB-ART-60706
J Neurosci
2024 Jul 03;4427:. doi: 10.1523/JNEUROSCI.2148-23.2024.
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Mutation of the ALS/FTD-associated RNA-binding protein FUS affects axonal development.
van Tartwijk FW
,
Wunderlich LCS
,
Mela I
,
Makarchuk S
,
Jakobs MAH
,
Qamar S
,
Franze K
,
Kaminski Schierle GS
,
St George-Hyslop PH
,
Lin JQ
,
Holt CE
,
Kaminski CF
.
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Aberrant condensation and localisation of the RNA-binding protein (RBP) fused in sarcoma (FUS) occur in variants of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD). Changes in RBP function are commonly associated with changes in axonal cytoskeletal organisation and branching in neurodevelopmental disorders. Here, we asked whether branching defects also occur in vivo in a model of FUS-associated disease. We use two reported Xenopus models of ALS/FTD (of either sex), the ALS-associated mutant FUS(P525L) and a mimic of hypomethylated FUS, FUS(16R). Both mutants strongly reduced axonal complexity in vivo. We also observed an axon looping defect for FUS(P525L) in the target area, which presumably arises due to errors in stop cue signalling. To assess whether loss of axon complexity also had a cue-independent component, we assessed axonal cytoskeletal integrity in vitro Using a novel combination of fluorescence and atomic force microscopy, we found that mutant FUS reduced actin density in the growth cone, altering its mechanical properties. Therefore, FUS mutants may induce defects during early axonal development.Significance statement This study demonstrates that mutation of the ALS/FTD (amyotrophic lateral sclerosis/frontotemporal dementia)-associated RNA-binding protein Fused in Sarcoma (FUS) can result in changes in axonal development. These changes occur both axon-autonomously in cytoskeletal organisation during axon extension and context-dependently during axonal branching. This indicates pre-symptomatic, developmental changes in axonal organisation may occur in familial disease variants.
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MR/K02292X/1 Medical Research Council , 109145 Wellcome Trust , 772426 European Research Council, 215943 Wellcome Trust , Wellcome Trust
Genes referenced: fus sod1
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