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The single cell transcriptomic profiling in iPSC derived Midbrain Organoid of POLG Disease

ABSTRACT: The single cell transcriptomic profiling in iPSC derived Midbrain Organoid of POLG Disease

PROVIDER: PRJNA1009590 | ENA |

REPOSITORIES: ENA

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The single cell transcriptomic profiling in iPSC derived Midbrain Organoid of POLG Disease

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Project description:Parkinson’s disease (PD) is a prevalent neurodegenerative disorder that is characterized by the selective loss of midbrain dopamine (DA)-producing neurons and the formation of α-synuclein (α-syn)-containing inclusions named Lewy bodies (LBs). Here, we report that the loss of glucocerebrosidase (GCase), coupled with α-syn overexpression, result in substantial accumulation of detergent-resistant α-syn aggregates and Lewy body-like inclusions (LBLIs) in human midbrain-like organoids (hMLOs). These LBLIs exhibit a highly similar structure to PD-associated LBs, by displaying a spherically symmetric morphology with an eosinophilic core, and containing α-syn and ubiquitin. Importantly, hMLOs generated from PD patient-derived inducible pluripotent stem cells (iPSCs) harboring SNCA triplication also exhibit subsequent degeneration of DA neurons and LBLI formation upon chronic GCase inhibitor treatment. Taken together, our hMLOs harbouring two major PD risk factors (GCase deficiency and overproduced α-syn) successfully recapitulate major pathophysiological signatures of the disease, and highlight the broad utility of brain organoid technology in modeling human neurodegenerative diseases.

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Project description:The human brain is a complex, three-dimensional structure. To better recapitulate the brain complexity, recent efforts focused on the development of human specific midbrain organoids. Midbrain organoids consist of differentiated and functional neurons, which contain active synapses, as well as astroglia and oligodendrocytes. However, the absence of microglia, with their ability to phagocyte apoptotic cells and debris represents a major disadvantage for the midbrain organoid system. Additionally, neuro-inflammation-related disease modeling is not possible in the absence of microglia. So far, no studies about the effects of iPSC-derived microglia in brain organoid neural cells have been published. Here we describe an approach to derive microglia from human iPSCs and integrate them into midbrain organoids. Using single nuclear RNA sequencing in collaboration with the RIKEN institute we provide a detailed characterization of the microglia in brain organoids as well as of the influence their presence has on the other cells of the organoids.

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