Project description:While complex inflammatory-like alterations are observed around the amyloid plaques of Alzheimer disease (AD), little is known about the molecular changes and cellular interactions that characterize this response. We investigate here in an AD mouse model the transcriptional changes occurring in tissue domains of 100 μm diameter around the amyloid plaques using spatial transcriptomics. We demonstrate early alterations in a gene co-expression network enriched for myelin and oligodendrocyte genes (OLIG), while a multicellular gene co- expression network of Plaque-Induced Genes (PIGs) involving the complement system, oxidative stress, lysosomes and inflammation is prominent in the later phase of the disease. We confirm the majority of the observed alterations at the cellular level using in situ sequencing on mouse and human brain sections. Genome-wide spatial transcriptomic analysis provides an unprecedented approach to untangle the dysregulated cellular network in the vicinity of pathogenic hallmarks of AD and other brain diseases.
Project description:Identification of cell types in the interphase between muscle and tendon by Visium Spatial Transcriptomics of four human semitendinous muscle-tendon biopsies. Cell types identified by single nuclei RNA seq on similar tissue were localized in situ with the use of Spatial Transcriptomics.
Project description:Tissue function relies on the precise spatial organization of cells characterized by distinct molecular profiles. Single-cell RNA-Seq captures molecular profiles but not spatial organization. Conversely, spatial profiling assays to date have lacked global transcriptome information, throughput or single-cell resolution. Here, we develop High-Density Spatial Transcriptomics (HDST), a method for RNA-Seq at high spatial resolution. Spatially barcoded reverse transcription oligonucleotides are coupled to beads that are randomly deposited into tightly packed individual microsized wells on a slide. The position of each bead is decoded with sequential hybridization using complementary oligonucleotides providing a unique bead-specific spatial address. We then capture, and spatially in situ barcode, RNA from the histological tissue sections placed on the HDST array. HDST recovers hundreds of thousands of transcript-coupled spatial barcodes per experiment at 2 μm resolution. We demonstrate HDST in the mouse brain, use it to resolve spatial expression patterns and cell types, and show how to combine it with histological stains to relate expression patterns to tissue architecture and anatomy. HDST opens the way to spatial analysis of tissues at high resolution.
Project description:These data were used in the spatial transcriptomics analysis of the article titled \\"Single-Cell and Spatial Transcriptomics Analysis of Human Adrenal Aging\\".
Project description:To investigate spatial heterogeneities in the axolotl forebrain, a coronal section of it was obtained for spatial transcriptomics using Visium V1.
Project description:The heterogeneous etiology of Alzheimer’s disease (AD) challenges therapeutic development. Understanding cell type specificity and local spatial contributions to different AD etiologies is instrumental to optimize therapeutic strategies for precision medicine. In this study, we compared cell-specific transcriptomes from the frontal cortex of carriers with the autosomal dominant mutation, PSEN1-E280A, sporadic AD and controls. Among the pathways that distinguished the autosomal dominant AD mutation disease from sporadic AD was increased autophagy and proteostasis pathways in astrocytes and oligodendrocytes in the former. Synaptic genes associated with neurofibrillary tangles in excitatory neurons were increased in both sporadic AD and mutation carriers. Spatial transcriptomics in samples from frontal cortex and CA1 hippocampus in PSEN1-E280A cases compared to non-diseased control individuals further validated the activation of chaperone-mediated autophagy genes and NFT-associated genes in E280A cases compared to controls. In conclusion, although autosomal dominant Alzheimer’s disease (ADAD) and sporadic AD share many features, the uniqueness of the cellular responses in each condition must be taken into consideration when designing clinical studies and therapeutics.
Project description:Comprehensive map of first- and second-trimester gonadal development in humans using a combination of single-cell and spatial transcriptomics, chromatin accessibility assays, and imaging.
Project description:Spatial transcriptomics (Visium, Spatial 3' V1, 10x Genomics) analysis of heart tissues from Lactobacillus casei cell wall extract (LCWE)-injected mice and control PBS-injected mice
Project description:To study the spatial localisations of the cell populations in an early haematopoietic tissue and lymphoid organs critical for T and B cell development, we profiled fetal liver, thymus and spleen from 3 donors at 18 PCW with sequencing-based spatial transcriptomics (10x Genomics Visium).