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Activation of polo-like kinase 1 correlates with selective motor neuron vulnerability in familial ALS

ABSTRACT: Mutations in the Fused in Sarcoma (FUS) gene cause familial amyotrophic lateral sclerosis (ALS), characterized by selective degeneration of spinal motor neurons (sMNs) with relative sparing of cortical neurons (CNs). The mechanisms underlying this cell-type vulnerability remain unclear. Here, we compare CNs and sMNs derived from FUS-ALS models to assess differential responses to FUS mutations. We find that CNs are less affected than sMNs in DNA damage repair, axonal organelle trafficking, and stress granule dynamics. RNA sequencing (RNA-seq) reveals distinct transcriptomic signatures, with sMNs uniquely activating DNA damage responses involving cell cycle regulators, particularly polo-like kinase 1 (PLK1). PLK1 is highly expressed in sMNs but not CNs, correlating with greater nuclear FUS loss and splicing defects in sMNs. Cross-comparison with other familial ALS RNA-seq datasets highlights PLK1 upregulation as a shared molecular feature. These findings identify intrinsic differences between CNs and sMNs in FUS-ALS and suggest PLK1 as a potential driver of sMN vulnerability.

ORGANISM(S): Homo sapiens

PROVIDER: GSE272827 | GEO | 2024/08/27

REPOSITORIES: GEO

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Axonal transcriptome reveals upregulation of PLK1 as a protective mechanism in response to increased DNA damage in FUSP525L spinal motor neurons

Project description:Mutations in the gene fused-in-sarcoma (FUS) have been implicated in the motor neuron disease Amyotrophic lateral sclerosis (ALS). However, it is poorly understood how these gene mutations lead to selective motor neuron (MN) degeneration and if there are common pathomechanisms across disease etiology. To address the biological impact of the FUS-P525L mutation on the transcriptome of neurons, we applied RNA-sequencing (RNA-seq) method, using microfluidic chambers, to generate axonal as well as soma compartment specific profiles from isogenic induced pluripotent stem cells (iPSCs)-derived motor neurons. We demonstrate high purity of axonal and soma fractions, and further show that the axonal transcriptome is very specific from somas with fewer number of transcripts. Notably, functional enrichment analysis revealed a unique and distinct transcriptional landscape in both axonal and soma compartments including specific transcript types, most of which were required for RNA metabolism and DNA damage/cell cycle related processes, that were likely altered by FUS mutation. Among altered transcripts, we identified robust upregulation of polo-like kinase 1 (PLK1), a master regulator of cell cycle-related events, in FUS-P525L mutant MNs and confirmed that inhibition of PLK1 increases late apoptotic or necrosis-induced neuronal cell death in mutant neurons compared to healthy controls. Taken together, our findings provide insights into compartment-specific transcriptomics in FUS-ALS neuronal model and we propose that PLK1 activation is a consequence of MN-specific upregulation, possibly contributing to the DNA-damage response and other associated pathways including cell cycle and cytoskeleton machinery.

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Project description:A number of mutations in a gene encoding RNA-binding protein FUS was linked to the development of a familial form of amyotrophic lateral sclerosis known a FUS-ALS. C-terminal truncations of FUS by a nonsense or frameshift mutations lead to the development of FUS-ALS with a particularly early onset and fast progression. However, even in patients with this aggressive form of the disease the function of motor neurons is not noticeably compromised for at least a couple of decades suggesting that until accumulation in the cytoplasm of pathogenic FUS lacking its C-terminal nuclear localisation signal does not reach a critical threshold, motor neurons are able to tolerate its permanent production. In order to identify how the nervous system responds to low levels of pathogenic variants of FUS we produced and characterised a mouse line, L-FUS[1-359], with a low level of neuronal expression of a highly aggregation prone and pathogenic form of C-terminally truncated FUS. In contrast to mice with substantially higher level of expression of the same FUS variant that develop severe early onset motor neuron pathology, L-FUS[1-359] mice do not develop any sign of pathology even at old age. Nevertheless, we detected substantial changes in the spinal cord transcriptome of these mice comparing to the wild type littermates. We suggest that at least some of these changes reflect activation of cellular mechanisms compensating to potentially damaging effect of pathogenic FUS production. Further studies of these mechanism might reveal effective target for therapy of FUS-ALS and possibly, other forms of ALS

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Project description:Mutations in Fused in Sarcoma (FUS) gene cause the familial and progressive form of amyotrophic lateral sclerosis (ALS). FUS is a nuclear RNA-binding protein involved in RNA processing and the biogenesis of a specific set of microRNAs. Here we report that Drosha and two previously uncharacterized Drosha-dependent miRNAs are strong modulators of FUS expression and prevent the cytoplasmic segregation of insoluble mutant FUS in vivo. We demonstrate that depletion of Drosha mitigates FUS-mediated degeneration, survival, and motor defects in Drosophila. Mutant FUS strongly interacts with Drosha and causes its cytoplasmic mis-localization into the insoluble FUS inclusions. Reduction in Drosha levels increases the solubility of mutant FUS. Interestingly, we found two Drosha dependent microRNAs, miR-378i and miR-6832-5p, which differentially regulate the expression, solubility, and cytoplasmic aggregation of mutant FUS in iPSC neurons and mammalian cells. More importantly, we report different modes of action of these miRNAs against mutant FUS. Whereas miR-378i may regulate mutant FUS inclusions by preventing G3BP-mediated stress granule formation, miR-6832-5p may affect FUS expression via other proteins or pathways. Overall, our research reveals a possible association between ALS-linked FUS mutations and the Drosha-dependent miRNA regulatory circuit, as well as a useful perspective on potential ALS treatment via microRNAs.

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2025-06-24 | GSE299997 | GEO

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2016-07-05 | E-GEOD-77700 | biostudies-arrayexpress

Distinct and shared functions of ALS-associated TDP-43, FUS, and TAF15 revealed by comprehensive multi-system integrative analyses [RNA-Seq_human]

2016-07-05 | E-GEOD-77702 | biostudies-arrayexpress

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Project description:TDP-43, FUS, and TAF15 are implicated in amyotrophic lateral sclerosis (ALS) and frontotemporal dementia. We integrate CLIP-seq and RNA Bind-N-Seq technologies to discover that TAF15 binds to ~4,900 RNAs enriched for GGUA motifs. In the mouse brain, TAF15 and FUS, but not TDP-43, exhibit strikingly similar RNA binding profiles, yet they alter the expression of distinct mRNA populations upon their individual depletions. TAF15 has a minimal role in alternative splicing and instead affects RNA turnover, consistent with an enrichment of TAF15 binding sites in 3â untranslated regions. In human stem cell-derived motor neurons, loss of both TAF15 and FUS affected mRNAs distinct from those altered by loss of either protein alone, revealing redundant roles for TAF15 and FUS in maintaining mRNA levels. Furthermore, concomitant rather than individual depletion of TAF15 and FUS more closely resembles RNA profiles of motor neurons derived from FUS R521G ALS patients or from late-stage, sporadic ALS patients. Our study reveals convergent and divergent mechanisms by which FUS, TAF15 and TDP-43 affects RNA metabolism in neurological disease. RNA-seq, CLIP-seq and arrays in mouse and human against TAF15 knockdowns This Series represents RNA-seq sample(s).

2016-07-05 | E-GEOD-77703 | biostudies-arrayexpress

Distinct and shared functions of ALS-associated TDP-43, FUS, and TAF15 revealed by comprehensive multi-system integrative analyses [RNA-Seq_Stability]

Project description:TDP-43, FUS, and TAF15 are implicated in amyotrophic lateral sclerosis (ALS) and frontotemporal dementia. We integrate CLIP-seq and RNA Bind-N-Seq technologies to discover that TAF15 binds to ~4,900 RNAs enriched for GGUA motifs. In the mouse brain, TAF15 and FUS, but not TDP-43, exhibit strikingly similar RNA binding profiles, yet they alter the expression of distinct mRNA populations upon their individual depletions. TAF15 has a minimal role in alternative splicing and instead affects RNA turnover, consistent with an enrichment of TAF15 binding sites in 3â untranslated regions. In human stem cell-derived motor neurons, loss of both TAF15 and FUS affected mRNAs distinct from those altered by loss of either protein alone, revealing redundant roles for TAF15 and FUS in maintaining mRNA levels. Furthermore, concomitant rather than individual depletion of TAF15 and FUS more closely resembles RNA profiles of motor neurons derived from FUS R521G ALS patients or from late-stage, sporadic ALS patients. Our study reveals convergent and divergent mechanisms by which FUS, TAF15 and TDP-43 affects RNA metabolism in neurological disease. RNA-seq, CLIP-seq and arrays in mouse and human against TAF15 knockdowns This Series represents RNA-seq sample(s).

2016-07-05 | E-GEOD-77704 | biostudies-arrayexpress

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Project description:TDP-43, FUS, and TAF15 are implicated in amyotrophic lateral sclerosis (ALS) and frontotemporal dementia. We integrate CLIP-seq and RNA Bind-N-Seq technologies to discover that TAF15 binds to ~4,900 RNAs enriched for GGUA motifs. In the mouse brain, TAF15 and FUS, but not TDP-43, exhibit strikingly similar RNA binding profiles, yet they alter the expression of distinct mRNA populations upon their individual depletions. TAF15 has a minimal role in alternative splicing and instead affects RNA turnover, consistent with an enrichment of TAF15 binding sites in 3â untranslated regions. In human stem cell-derived motor neurons, loss of both TAF15 and FUS affected mRNAs distinct from those altered by loss of either protein alone, revealing redundant roles for TAF15 and FUS in maintaining mRNA levels. Furthermore, concomitant rather than individual depletion of TAF15 and FUS more closely resembles RNA profiles of motor neurons derived from FUS R521G ALS patients or from late-stage, sporadic ALS patients. Our study reveals convergent and divergent mechanisms by which FUS, TAF15 and TDP-43 affects RNA metabolism in neurological disease. RNA-seq, CLIP-seq and arrays in mouse and human against TAF15 knockdowns This Series represents array sample(s).

2016-07-05 | E-GEOD-77699 | biostudies-arrayexpress

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