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TISSUE
Protein and RNA profiles in tissues based on antibodies and transcriptomics

BRAIN
Protein and RNA profiles in brain based on microdissected regions

SINGLE CELL TYPE
Single cell RNA profiles in tissues based on single cell RNA analysis

TISSUE CELL TYPE
Cell type profiles in tissues based on deconvolution of bulk transcriptomics

PATHOLOGY
Protein and RNA profiles in human cancers based on antibodies and transcriptomics

DISEASE
Protein levels in blood in patients with diseases

IMMUNE CELL
RNA profiles in human immune cells

BLOOD PROTEIN
Blood protein levels in healthy individuals and the human secretome

SUBCELLULAR
Spatial, subcellular protein profiles in human cells based on antibodies

CELL LINE
RNA profiles in human cell lines with best models for human cancers

STRUCTURE
3D-structures of human proteins with antibody-binding sites and genetic variants

INTERACTION
Human protein-protein interactions and metabolic enzyme profiles

The atlas for all human proteins in cells and tissues using various omics: antibody-based imaging, transcriptomics, MS-based proteomics, and systems biology. Sections include the Tissue, Brain, Single Cell Type, Tissue Cell Type, Pathology, Disease Blood Atlas, Immune Cell, Blood Protein, Subcellular, Cell Line, Structure, and Interaction.

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The Human Protein Atlas

Royal Institute of Technology Operations

Anders Hillbo

Jonas Andersson

Kungliga Tekniska Hogskolan

SUNET-MNT

KTHLAN-227


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Tissue-based map of the human proteome.

Human Protein Atlas

This section of the Human Protein Atlas focuses on the expression profiles in human tissues of genes both on the mRNA and protein level. The protein expression data from 44 normal human tissue types is derived from antibody-based protein profiling using conventional and multiplex immunohistochemistry. All underlying images of immunohistochemistry stained normal tissues are available together with knowledge-based annotation of protein expression levels. The protein data covers 15303 genes (76%) for which there are available antibodies. The mRNA expression data is derived from deep sequencing of RNA (RNA-seq) from 40 different normal tissue types. 
More information about the specific content and the generation and analysis of the data in the section can be found on the Methods Summary.
Learn about:

protein localization in tissues at a single-cell level 
if a gene is enriched in a particular tissue (specificity)
which genes have a similar expression profile across tissues (expression cluster) 


Human Protein Atlas - Tissue

This section  provides comprehensive spatial profiling of the Brain, including overview of protein expression in the mammalian brain based on integration of data from human, pig and mouse. Transcriptomics data combined with affinity-based protein in situ localization down to single cell detail is available in this brain-centric sub atlas of the Human Protein Atlas. The data presented are for human genes and their one-to-one orthologues in pig and mouse. Gene summary pages provide the hierarchical expression landscape form 13 main regions of the brain to individual nuclei and subfields for every protein coding gene. For selected proteins, high content images are available to explore the cellular and subcellular protein distribution. In addition, the Brain section contains lists of genes with elevated expression in one or a group of regions to help the user identify unique protein expression profiles linked to physiology and function. 
More information about the specific content and the generation and analysis of the data in this section can be found on the Methods Summary.
Learn about:

Expression levels for all human proteins in regions and subregions of the human brain
Expression levels for all proteins with human orthologs in regions and subregions of the pig and mouse brain
Brain enriched genes with higher expression in any of the regions of the brain compared to peripheral organs
Regional enriched genes with higher expression in a single or few regions of the brain
Cell-type and cell-compartment distribution of selected proteins in the human and mouse brain
Differences in gene expression between mammalian species

Additional information:
In addition to the data provided in the brain section there is also data on human retina and single cell data containing information on protein expression in human neuronal and non-neuronal cell-types in the central nervous system. 

Human Protein Atlas - Brain

This section contains Single Cell Type information based on single cell RNA sequencing (scRNAseq) data from 31 human tissues including peripheral blood mononuclear cells (PBMCs). The data is linked to in-house generated immunohistochemically stained tissue sections presented in the  Tissue  section in order to visualize the corresponding spatial protein expression patterns. The scRNAseq analysis was based on publicly available genome-wide expression data and comprises all protein-coding genes in 557 individual cell type clusters corresponding to 15 different cell type groups. A specificity classification was performed to determine the number of genes elevated in these single cell types. The genes expressed in each of the cell types can be explored in interactive UMAP plots and bar charts, with links to corresponding immunohistochemical stainings in human tissues.  
More information about the specific content and the generation and analysis of the data in the section can be found on the Methods Summary.
Learn about:

mRNA and protein expression in single cell types
if a gene is enriched in a particular cell type (specificity)
which genes have a similar expression profile across cell types (expression cluster)


Human Protein Atlas - Single cell type

The Tissue Cell Type section contains cell type expression specificity predictions for all human protein coding genes, generated using integrated network analysis of publicly available bulk RNAseq data. A specificity classification is used to predict which genes are enriched in each constituent cell type within an individual tissue. The data can be explored on a tissue-by-tissue basis, together with in-house generated immunohistochemically stained tissue sections. In addition, a core cell type analysis focuses on the cell types found in all, or the majority, of the profiled tissues, e.g., endothelial cells or macrophages. Here, genes with predicted specificity in these core cell types in multiple tissues are detailed. More information about the specific content and data analysis in the section can be found in the Methods Summary. 

Learn about:

if a gene is predicted to have cell type specificity within a given tissue
which genes have a common cell type specificity prediction within each tissue 
the catalogue of genes with predicted specificity in core cell types across tissues


Human Protein Atlas - Tissue cell type

This section contains Pathology information based on mRNA and protein expression data from 17 different forms of human cancer, together with millions of in-house generated immunohistochemically stained tissue sections images and Kaplan-Meier plots showing the correlation between mRNA expression of each human protein gene and cancer patient survival. More information about the specific content and the generation and analysis of the data in the section can be found in the  Methods Summary.
Cancer statistics from relevant international and Swedish databases are summarized here, and hallmarks of cancer are described here. 
Learn about:

if the mRNA expression of a gene is prognostic for patient survival in each of the cancer types
if a gene is enriched in a particular cancer type (specificity)
the catalogue of genes elevated in each of the cancer types


Human Protein Atlas - Pathology

The Human Disease Blood Atlas contains information on protein levels in blood in patients with different diseases and highlights proteins associated with these diseases using differential expression analysis and a disease prediction strategy based on machine-learning. In this version, a pan-cancer study is reported covering 1463 proteins quantified by Proximity Extension Assay (PEA) and 146 proteins quantified by isotope dilution strategies based on the addition of recombinant protein fragment standards – the gold standard of quantitative mass spectrometry.  Protein profiles have been quantified across  12 major cancer types. More information about the specific content and the generation and analysis of the data in the section can be found in the Methods Summary. 
Learn about

comprehensive and precise protein levels in blood covering 12 different cancer types
proteins associated with each of the analyzed cancers 


Human Protein Atlas - Disease

The Immune Cell section contains single cell information on genome-wide RNA expression profiles of human protein-coding genes covering various B- and T-cells, monocytes, granulocytes and dendritic cells. The transcriptomics analysis covers 18 cell types isolated with cell sorting and includes classification based on specificity, distribution and expression cluster across all immune cells. More information about the specific content and the generation and analysis of the data in the section can be found in the Methods Summary.
Learn about:

if a gene is enriched in a particular immune cell type (specificity)
which genes have a similar expression profile across the immune cells (expression cluster)
the catalogue of genes elevated in each of the immune cell types


Human Protein Atlas - Immune cell

The Blood Proteins section presents estimated plasma concentrations of the proteins detected in human blood from mass spectrometry-based proteomics studies, published immune assay data and a longitudinal study based on proximity extension assay (PEA). Further, an analysis of the “human secretome” is presented including annotation of the genes predicted to be actively secreted to human blood, as well as to other compartments or organ systems of the human body such as the digestive tract or the brain. More information about the specific content and the generation and analysis of the data in this section can be found in the Methods Summary.
Learn about:

the plasma levels of blood proteins in a longitudinal study of healthy individuals
the levels of plasma proteins using immune assays and mass spectrometry-based proteomics
the classification of the human secretome (proteins secreted from human cells)


Human Protein Atlas - Blood protein

The subcellular section of the Human Protein Atlas provides high-resolution insights into the expression and spatiotemporal distribution of proteins encoded by 13147 genes (65% of the human protein-coding genes). For each gene, the subcellular distribution of the protein has been investigated by immunofluorescence (ICC-IF) and confocal microscopy in up to three different cell lines, selected from a panel of 37 cell lines used in the subcellular section. Upon image analysis, the subcellular localization of the protein has been classified into one or more of 35 different organelles and fine subcellular structures. In addition, the section includes an annotation of genes that display single-cell variation in protein expression levels and/or subcellular distribution, as well as an extended analysis of cell cycle dependency of such variations. 
The subcellular section offers a database for detailed exploration of individual genes and proteins of interest, as well as for systematic analysis of proteomes in a broader context. More information about the content of the section, as well as the generation and analysis of the data, can be found in the Methods summary.
Learn about:

The subcellular distribution of proteins in human cell lines.
The proteomes of different organelles and subcellular structures.
Single-cell variability in the expression levels and/or localizations of proteins.


Human Protein Atlas - Subcellular

The Cell Line section contains information on genome-wide RNA expression profiles of human protein-coding genes in 1206  human cell lines, including 1132 cancer cell lines. The transcriptomics analysis includes classification based on specificity analysis across 28 cancer types, distribution and expression cluster analysis across all cell lines and for selected cancer types also analysis of similarity of the cell lines to their corresponding cancer type. More information about the specific content and the generation and analysis of the data in the section can be found in the Methods summary.
Learn about:

if a gene is enriched in cellines from a particular cancer type (specificity)
which genes have a similar expression profile across the cell lines (expression cluster)
the catalogue of genes elevated in each of the cell lines
which cell line has the most consistent expression profile to its corresponding TCGA disease cohort (i.e., the best cell lines for cancer study)
cancer-related pathway and cytokine activity of each cell line


Human Protein Atlas - Cell line

The Structure section contains information about the three-dimensional structure of human proteins.The predicted 3D structure from the AlphaFold Protein Structure Database  project is shown with the possibility to highlight selected regions and positions in the structure. The Protein Browser can be used to select splice variants and display protein related features such as known antigen sequences, transmembrane regions and InterPro domains on the structures. The amino acid positions of population variants and variants with known clinical relevance in the Ensembl variation database can also be displayed. More information about the specific content and the generation and analysis of the data in the section can be found in the Methods Summary. 
Learn about:

the predicted 3D structure of proteins
the position of selected protein features in the structures
the known missense variants with clinical significance
the known missense variants in the population
the antigen structure for the majority of the antibodies


Human Protein Atlas - Structure

The Interaction section presents data on interaction networks based on protein-protein interactions from the IntAct database and metabolic pathways from the Metabolic Atlas. More information about the specific content and the generation of the data in this section can be found in the  Methods summary.
Learn about:

the interactions of a protein with other proteins
features of the protein-protein interaction networks
what pathways/subsystems a metabolic gene is part of
which genes are nearby in the metabolic network
how the expression of the genes in a pathway/subsystem varies across different tissues


Human Protein Atlas - Interaction

The Human Protein Atlas is a Swedish-based program initiated in 2003 with the aim to map all the human proteins in cells, tissues, and organs using an integration of various omics technologies, including antibody-based imaging, mass spectrometry-based proteomics, transcriptomics, and systems biology. All the data in the knowledge resource is open access to allow scientists both in academia and industry to freely access the data for exploration of the human proteome.

The Human Protein Atlas consists of twelve separate sections, each focusing on a particular aspect of the genome-wide analysis of the human proteins:


The Tissue section, showing the distribution of the proteins across all major tissues and organs in the human body
The Brain section, exploring the distribution of proteins in various regions of the mammalian brain
The Single Cell Type section, showing expression of protein-coding genes in single human cell types based on scRNA-seq
The Tissue Cell Type section, showing expression of protein-coding genes in human cell types based on bulk RNAseq data
The Pathology section, showing the impact of protein levels for the survival of patients with cancer
The Disease Blood Atlas section, showing protein levels in blood in patients with different diseases and protein panels used for disease prediction
The Immune Cell section, showing expression of protein-coding genes in immune cell types
The Blood Protein section, describing proteins detected in blood and proteins secreted by human tissues
The Subcellular section, showing the subcellular localization of proteins in single cells
The Cell Line section, showing expression of protein-coding genes in human cell lines
The Structure section, showing experimental and predicted 3D structures of proteins including antigen sites and population- and clinical variants
The Interaction section, exploring the expression and features of protein-coding genes in the context of protein-protein and metabolic interaction networks

The Human Protein Atlas program has already contributed to several thousands of publications in the field of human biology and disease and it is selected by the organization ELIXIR (www.elixir-europe.org) as a European core resource due to its fundamental importance for a wider life science community. The Human Protein Atlas consortium is mainly funded by the Knut and Alice Wallenberg Foundation.


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