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      Single-cell analysis reveals congruence between kidney organoids and human fetal kidney

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          Abstract

          Background

          Human kidney organoids hold promise for studying development, disease modelling and drug screening. However, the utility of stem cell-derived kidney tissues will depend on how faithfully these replicate normal fetal development at the level of cellular identity and complexity.

          Methods

          Here, we present an integrated analysis of single cell datasets from human kidney organoids and human fetal kidney to assess similarities and differences between the component cell types.

          Results

          Clusters in the combined dataset contained cells from both organoid and fetal kidney with transcriptional congruence for key stromal, endothelial and nephron cell type-specific markers. Organoid enriched neural, glial and muscle progenitor populations were also evident. Major transcriptional differences between organoid and human tissue were likely related to technical artefacts. Cell type-specific comparisons revealed differences in stromal, endothelial and nephron progenitor cell types including expression of WNT2B in the human fetal kidney stroma.

          Conclusions

          This study supports the fidelity of kidney organoids as models of the developing kidney and affirms their potential in disease modelling and drug screening.

          Electronic supplementary material

          The online version of this article (10.1186/s13073-019-0615-0) contains supplementary material, which is available to authorized users.

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          Most cited references37

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          A step-by-step workflow for low-level analysis of single-cell RNA-seq data with Bioconductor

          Single-cell RNA sequencing (scRNA-seq) is widely used to profile the transcriptome of individual cells. This provides biological resolution that cannot be matched by bulk RNA sequencing, at the cost of increased technical noise and data complexity. The differences between scRNA-seq and bulk RNA-seq data mean that the analysis of the former cannot be performed by recycling bioinformatics pipelines for the latter. Rather, dedicated single-cell methods are required at various steps to exploit the cellular resolution while accounting for technical noise. This article describes a computational workflow for low-level analyses of scRNA-seq data, based primarily on software packages from the open-source Bioconductor project. It covers basic steps including quality control, data exploration and normalization, as well as more complex procedures such as cell cycle phase assignment, identification of highly variable and correlated genes, clustering into subpopulations and marker gene detection. Analyses were demonstrated on gene-level count data from several publicly available datasets involving haematopoietic stem cells, brain-derived cells, T-helper cells and mouse embryonic stem cells. This will provide a range of usage scenarios from which readers can construct their own analysis pipelines.
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            Kidney organoids from human iPS cells contain multiple lineages and model human nephrogenesis.

            The human kidney contains up to 2 million epithelial nephrons responsible for blood filtration. Regenerating the kidney requires the induction of the more than 20 distinct cell types required for excretion and the regulation of pH, and electrolyte and fluid balance. We have previously described the simultaneous induction of progenitors for both collecting duct and nephrons via the directed differentiation of human pluripotent stem cells. Paradoxically, although both are of intermediate mesoderm in origin, collecting duct and nephrons have distinct temporospatial origins. Here we identify the developmental mechanism regulating the preferential induction of collecting duct versus kidney mesenchyme progenitors. Using this knowledge, we have generated kidney organoids that contain nephrons associated with a collecting duct network surrounded by renal interstitium and endothelial cells. Within these organoids, individual nephrons segment into distal and proximal tubules, early loops of Henle, and glomeruli containing podocytes elaborating foot processes and undergoing vascularization. When transcription profiles of kidney organoids were compared to human fetal tissues, they showed highest congruence with first trimester human kidney. Furthermore, the proximal tubules endocytose dextran and differentially apoptose in response to cisplatin, a nephrotoxicant. Such kidney organoids represent powerful models of the human organ for future applications, including nephrotoxicity screening, disease modelling and as a source of cells for therapy.
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              Canonical correlation analysis: an overview with application to learning methods.

              We present a general method using kernel canonical correlation analysis to learn a semantic representation to web images and their associated text. The semantic space provides a common representation and enables a comparison between the text and images. In the experiments, we look at two approaches of retrieving images based on only their content from a text query. We compare orthogonalization approaches against a standard cross-representation retrieval technique known as the generalized vector space model.
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                Author and article information

                Contributors
                alexander.combes@unimelb.edu.au
                luke.zappia@mcri.edu.au
                peixuan.er@mcri.edu.au
                alicia.oshlack@mcri.edu.au
                +61 3 9936 6206 , melissa.little@mcri.edu.au
                Journal
                Genome Med
                Genome Med
                Genome Medicine
                BioMed Central (London )
                1756-994X
                23 January 2019
                23 January 2019
                2019
                : 11
                : 3
                Affiliations
                [1 ]ISNI 0000 0001 2179 088X, GRID grid.1008.9, Department of Anatomy & Neuroscience, , University of Melbourne, ; Melbourne, VIC Australia
                [2 ]ISNI 0000 0000 9442 535X, GRID grid.1058.c, Murdoch Children’s Research Institute, ; Melbourne, VIC Australia
                [3 ]ISNI 0000 0001 2179 088X, GRID grid.1008.9, School of Biosciences, , The University of Melbourne, ; Melbourne, VIC Australia
                [4 ]ISNI 0000 0001 2179 088X, GRID grid.1008.9, Department of Paediatrics, , The University of Melbourne, ; Melbourne, VIC Australia
                Author information
                http://orcid.org/0000-0003-0380-2263
                Article
                615
                10.1186/s13073-019-0615-0
                6345028
                30674341
                07783cac-29da-465b-ae7f-18e718dc9b57
                © The Author(s). 2019

                Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

                History
                : 24 September 2018
                : 14 January 2019
                Funding
                Funded by: Australian Research Council (AU)
                Award ID: DE150100652
                Award Recipient :
                Funded by: National Institutes of Health Rebuilding a Kidney consortium
                Award ID: DK107344
                Award Recipient :
                Funded by: FundRef http://dx.doi.org/10.13039/501100000925, National Health and Medical Research Council;
                Award ID: 1136085
                Award ID: 1156567
                Award Recipient :
                Categories
                Research
                Custom metadata
                © The Author(s) 2019

                Molecular medicine
                single-cell rna sequencing,human kidney organoids,stem cell-derived models,induced pluripotent cells,organoids

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