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Lysosomal Dynamics Orchestrate Neurogenesis [RIP-Seq]

ABSTRACT: Lysosomes are cellular recycling stations and metabolic signaling hubs. Whether lysosome dynamics regulate mammalian brain development is unknown. We found that radial glia cells possess a large number of endolysosomes and that asymmetric inheritance of lysosomes in daughters of radial glia cells can predict fate and cell cycle length. To determine the lysosomal regulation of translation initiation by mTORC1/eIF4E axis, we performed RNA immunoprecipitation sequencing (RIP-seq) with antibody against eIF4E in E13.5 neocortex.

ORGANISM(S): Mus musculus

PROVIDER: GSE205683 | GEO | 2022/08/31

REPOSITORIES: GEO

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Lysosomal Dynamics Orchestrate Neurogenesis [Polysome-seq]

Project description:Lysosomes are cellular recycling stations and metabolic signaling hubs. Whether lysosome dynamics regulate mammalian brain development is unknown. We found that radial glia cells possess a large number of endolysosomes and that asymmetric inheritance of lysosomes in daughters of radial glia cells can predict fate and cell cycle length. To determine the translation control by the mTORC1, we performed polysome profiling of mRNAs associated with >3 ribosomes for neural progenitor cells that treated with DMSO or Torin1 for 2 hours.

2022-08-31 | GSE205681 | GEO

Transcription profiling of mouse functionally distinct radial glial subsets

Project description:Since the discovery of radial glia as the source of neurons, their heterogeneity in regard to neurogenesis has been described by clonal and time-lapse analysis in vitro. However, the molecular determinants specifying neurogenic radial glia differently from radial glia that mostly self-renew remain ill-defined. Here, we isolated two radial glial subsets that co-exist at mid-neurogenesis in the developing cerebral cortex and their immediate progeny. While one subset generates neurons directly, the other is largely non-neurogenic but also gives rise to Tbr2-positive basal precursors, thereby contributing indirectly to neurogenesis. Isolation of ; these distinct radial glia subtypes allowed determining interesting differences in their transcriptome. These transcriptomes were also strikingly different from the transcriptome of radial glia isolated at the end of neurogenesis. This analysis therefore identifies, for the first time, the lineage origin of basal progenitors and the molecular differences of this lineage in comparison to directly neurogenic and gliogenic radial glia. Experiment Overall Design: Comparison of radial glial subtypes

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ESCRT-I controls lysosomal membrane protein homeostasis and restricts MCOLN1-dependent TFEB/TFE3 signaling.

Project description:Within the endolysosomal pathway in mammalian cells, ESCRT complexes facilitate degradation of membrane proteins from limiting membranes of late endosomes. Recent studies revealed that yeast ESCRT proteins also sort for degradation, ubiquitinated proteins from vacuolar membrane. However, whether mammalian ESCRTs perform similar function at lysosomes remained unknown. Here, we studied the involvement of mammalian ESCRT-I in maintaining lysosomal membrane homeostasis and its implication in lysosome-related signaling. We show that ESCRT-I restricts the size of lysosomes and promotes degradation of lysosomal Ca2+ channel, MCOLN1 protein. ESCRT-I depletion induced transcriptional response related to MiT-TFE signaling and cholesterol biosynthesis, pointing to lysosomal dysfunction. The lack of ESCRT-I promoted abnormal cholesterol accumulation on lysosomes and activated TFEB/TFE3 transcription factors in Ca2+-MCOLN1-dependent, but lipid-independent manner. Hence, our study provides evidence that ESCRT-I maintains lysosomal homeostasis and elucidates MiT-TFE regulatory mechanism activated in response to ESCRT-I deprivation

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Lysosomal proteomics by affinity purification-mass spectrometry

Project description:The aims of this project is to establish a comprehensive proteomic map of the lysosomes using isolated lysosomes via affinity purification. Affinity-purified mitochondria was used as a control to demonstrate the organelle specificity. In this study, we identified several lipid transporters that are associated with the lysosome and further characterized their roles in sterol-dependent mTORC1 regulation.

2019-09-27 | PXD014733 | Pride

Parkinson’s VPS35[D620N] retromer lysosomal dysfunction induces LRRK2 mediated lysosomal association of RILPL1 and TMEM55B

Project description:The D620N VPS35 mutation disrupts retrograde endosome to Golgi retromer Trafficking. Thus causes lysosome dysfunction, enhances LRRK2 kinase activity and leads to Parkinson’s disease. We employed a LysoTag immunoprecipitation approach to assess how this impacts lysosomes using quantitative proteomics. The VPS35[D620N] mutation alters the expression of over 350 lysosomal proteins, and induces recruitment of LRRK2 phosphorylated Rab proteins to the lysosome, as well as the phosphoRab effector protein RILPL1.

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Peripheral positioning of lysosomes supports melanoma aggressiveness

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Lysosomal cystine export regulates mTORC1 signaling to guide kidney epithelial cell fate specialization (Microarray)

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Prospective isolation of functionally distinct radial glial subtypes - lineage and transcriptome analysis

Project description:Since the discovery of radial glia as the source of neurons, their heterogeneity in regard to neurogenesis has been described by clonal and time-lapse analysis in vitro. However, the molecular determinants specifying neurogenic radial glia differently from radial glia that mostly self-renew remain ill-defined. Here, we isolated two radial glial subsets that co-exist at mid-neurogenesis in the developing cerebral cortex and their immediate progeny. While one subset generates neurons directly, the other is largely non-neurogenic but also gives rise to Tbr2-positive basal precursors, thereby contributing indirectly to neurogenesis. Isolation of these distinct radial glia subtypes allowed determining interesting differences in their transcriptome. These transcriptomes were also strikingly different from the transcriptome of radial glia isolated at the end of neurogenesis. This analysis therefore identifies, for the first time, the lineage origin of basal progenitors and the molecular differences of this lineage in comparison to directly neurogenic and gliogenic radial glia.

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Lysosomal cystine export regulates mTORC1 signaling to guide kidney epithelial cell fate specialization (RNA-Seq)

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Project description:Lysosomes are critical for cellular metabolism and heterogeneously involved in various cellular processes such as endocytosis, autophagy and senescence. The ability to measure lysosomal metabolic heterogeneity is essential for understanding its physiological roles. We therefore built a single-lysosome mass spectrometry (SLMS) platform integrating lysosomal patch-clamp recording and induced nanoESI/MS that enabled concurrent metabolic and electrophysiological profiling of individual enlarged lysosomes.

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