Freezing of feeder-free hPSCs
By onThis protocol describes the process of freezing feeder-free human pluripotent stem cells (hPSCs) using Accutase or ReLeSR
A fluorescence-based in vitro scrambling assay for yeast MCP1 and human XK
By onVPS13 proteins are proposed to function at contact sites between organelles as bridges for lipids to move directionally and in bulk between organellar membranes. VPS13s are found to interact with integral membrane proteins, like MCP1 in yeast or XK in humans. We showed that MCP1 and XK scramble phospholipids in vitro. Here I describe the detailed procedure of purification, reconstitution, and scrambling assay for both MCP1 and XK.
GBA Variants and Parkinson Disease: Mechanisms and Treatments
By onThis review discusses the pathways associated with GBA-PD and highlights potential treatments which may act to target the lysosomal enzyme glucocerebrosidase and prevent neurodegeneration.
Culture and transfection of iPSC-derived neurons for live-imaging of axonal cargoes
By onThe authors plate, culture, and transfect human iPSC-derived excitatory glutamatergic neurons for the purpose of observing transport of axonal cargoes under spinning disk confocal microscopy.
Glucocerebrosidase is imported into mitochondria and preserves complex I integrity and energy metabolism
By onMutations in GBA1, the gene encoding the lysosomal enzyme β-glucocerebrosidase (GCase), which cause Gaucher’s disease, are the most frequent genetic risk factor for Parkinson’s disease (PD). Here, we employ global proteomic and single-cell genomic approaches in stable cell lines as well as induced pluripotent stem cell (iPSC)-derived neurons and midbrain organoids to dissect the mechanisms underlying GCase-related neurodegeneration. We demonstrate that GCase can be imported from the cytosol into the mitochondria via recognition of internal mitochondrial targeting sequence-like signals. In mitochondria, GCase promotes the maintenance of mitochondrial complex I (CI) integrity and function. Furthermore, GCase interacts with the mitochondrial quality control proteins HSP60 and LONP1. Disease-associated mutations impair CI stability and function and enhance the interaction with the mitochondrial quality control machinery. These findings reveal a mitochondrial role of GCase and suggest that defective CI activity and energy metabolism may drive the pathogenesis of GCase-linked neurodegeneration.
Structural basis for the specificity of PPM1H phosphatase for Rab GTPases
By onLRRK2 acts by adding a phosphate group to enzymes known as Rab GTPases, which causes new biological events. The authors analyzed the structure of an enzyme, PPM1H, that counteracts LRRK2 by removing the phosphate group it adds to Rab GTPases.
Reduced Thalamic Excitation to Motor Cortical Pyramidal Tract Neurons in Parkinsonism
By onThe current data suggests that cell subtype- and synapse-specific adaptations in M1 contribute to altered cortical outputs in parkinsonism and are important aspects of PD pat
Induction of non-selective bulk autophagy
By onThis protocol describes how to induce bulk (non-selective) autophagy in HeLa cells through nutrient starvation.
pAC150- FAM134C-GFP
By onThe text describes a PiggyBac vector used to express a GFP-FAM134C reporter gene.
ASAP Blueprint for Collaborative Open Science
By onThis Blueprint presents initial findings on how ASAP’s approach to open science has solidified and evolved over its first three years, data and metrics on progress, and CC-BY versions of assets that can be adopted and adapted by others.
pCAG- WIPI2dI92E-cs- TEV -STREP
By onPlasmid: Mammalian expression of human WIPI2d I92E with C-terminal Strep.
VPS13D DNA plasmid generation
By onThis protocol describes the basic mole cular cloning technique utilized for the generation of VPS13D constructs in https://doi.org/10.1083/jcb.202010004. This protocol and the enzymes included in it are commercialized by Takara Bio.Due to low expression of big DNA constructs (u003e10kb), we decided to generate a codon-optimized cDNA encoding for human VPS13D, including an mScarlet fluorescent protein after aminoacid 1576 flanked by BamHI restriction enzyme sites. The construct was generated by and purchased from Genscript. From this initial construct, we generated several VPS13D constructs. The specific primers and enzymes used for each construct are included in Table 1 of our manuscript: https://doi.org/10.1083/jcb.202010004" . For most of our cloning procedures, Infusion cloning (Takara) was used.
From Policy to Practice: Tracking an Open Science Funding Initiative
By onBy normalizing the open science and compliance process across funding bodies, ASAP hopes to simplify and streamline researcher, institutional, and funder workflows, allowing researchers to focus on science.
Detecting Full-Length EccDNA with FLED and long-reads sequencing
By onReconstructing the full-length sequence of extrachromosomal circular DNA (eccDNA) from short sequencing reads has proved challenging given the similarity of eccDNAs and their corresponding linear DNAs. Previous sequencing methods were unable to achieve high-throughput detection of full-length eccDNAs. Here we describe a new strategy that combined rolling circle amplification (RCA) and nanopore long-reads sequencing technology to generate full-length eccDNAs. We further developed a novel algorithm, called Full-Length eccDNA Detection (FLED), to reconstruct the sequence of eccDNAs. We used FLED to analyze seven human epithelial and cancer cell line samples and identified over 5,000 full-length eccDNAs per sample. The structures of identified eccDNAs were validated by both PCR and Sanger sequencing. Compared to other published nanopore-based eccDNA detectors, FLED exhibited higher sensitivity. In cancer cell lines, the genes overlapped with eccDNA regions were enriched in cancer-related pathways and cis-regulatory elements can be predicted in the up-stream or downstream of intact genes on eccDNA molecules, and the expressions of these cancer-related genes were dysregulated in tumor cell lines, indicating the regulatory potency of eccDNAs in biological processes. Our method takes advantage of nanopore long reads and enables unbiased reconstruction of full-length eccDNA sequences. FLED is imple-mented using Python3 which is freely available on GitHub (https://github.com/FuyuLi/FLED).
Generation of human-induced pluripotent-stem-cell-derived cortical neurons for high-throughput imaging of neurite morphology and neuron maturation
By onA STAR protocol that describes how to differentiate cryopreserved human cortical neuronal progenitors into mature cortical neurons for high-throughput imaging analysis
Phosphosite mapping on PI3Kc1 by ULK1 and TBK1 kinases.
By onPhosphosite mapping on PI3Kc1 by ULK1 and TBK1 kinases.
Conserved and cell type-specific transcriptional responses to IFN-γ in the ventral midbrain
By onNeurons present antigens when exposed to IFN-γ, leading to MHC-I expression. IFN-γ induces MHC-I in neurons, glia, and microglia, with glia showing a stronger response. Neuronal response to IFN-γ is dependent on IFNGR signaling.
