How do you integrate omics data from different sources and platforms?
Omics data, such as genomics, proteomics, metabolomics, and transcriptomics, can provide valuable insights into the molecular mechanisms and pathways of diseases and treatments. However, integrating omics data from different sources and platforms can be challenging, as they may have different formats, qualities, scales, and annotations. In this article, you will learn some basic steps and tips on how to integrate omics data from different sources and platforms for translational research.
The first step is to harmonize the data, which means to make them comparable and consistent across sources and platforms. This may involve converting the data to a common format, such as FASTQ for sequencing data or CSV for tabular data, and applying the same quality control and filtering criteria. You may also need to align the data to a common reference, such as a genome or a protein database, and annotate the data with standardized identifiers, such as gene symbols or metabolite names. Data harmonization can help reduce the noise and bias in the data and facilitate downstream analysis.
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A major challenge with any platform is data hormonization, for example, RNA seq data sets from Illumina and Affymetrix, bulk transcriptomics and single cell transcriptomics, different normalization methods, etc., which makes accurate interpretation difficult. It becomes even more difficult to compare datasets across platforms such as transcriptomics, proteomics, and metabolomics. Data hormonization has several methods, but finding something intuitively useful is rare. So I ended up innovating my own methods for example, to interpret the expression of metabolic genes in disease without normal specimens, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8576537/ and harmonize large/different datasets https://doi.org/10.3390/biomedicines10112720.
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> Ensure omics data adheres to common standards for compatibility. > Use platforms supporting seamless integration of diverse datasets. > Standardize metadata for consistent integration. > Apply robust techniques for cross-platform data normalization. > Utilize bioinformatics tools for efficient multi-omics merging. > Apply systems biology for holistic molecular insights. > Implement algorithms for automated pattern recognition. > Foster shared methodologies and best practices. > Enforce measures to ensure data reliability and accuracy. > Develop flexible approaches for evolving technologies.
The next step is to integrate the data, which means to combine them in a meaningful way to answer a specific research question. There are different methods and tools for data integration, depending on the type, level, and complexity of the data. For example, you can use meta-analysis to combine the results of multiple studies, or you can use multivariate analysis to explore the relationships among multiple variables. You can also use network analysis to visualize the interactions among different omics data, or you can use machine learning to discover patterns and associations in the data. Data integration can help reveal the synergies and complementarities of the data and generate novel hypotheses.
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Continuing from previous section above, as a result of transforming all numbers in the omics dataset into directional vectors based on median shifts, numbers between 0 and 0.5 exhibit receding and progressive effects, respectively. Therefore, every number in a data matrix acts as a Doppler effect. This format allows for the seamless integration of multiplatform or multi-omics datasets, with each data point telling its own biological story very precisely. Its ability to provide directionality allows it to forecast past and future biological states, as well as possible mutations that may occur, providing one of the most powerful ways of planning future therapies for the same patient. (see https://doi.org/10.3390/biomedicines10112720).
The third step is to interpret the data, which means to explain the biological significance and implications of the data integration results. This may involve validating the results with external sources, such as literature, databases, or experiments, and contextualizing the results with relevant knowledge, such as pathways, functions, or phenotypes. You may also need to compare the results with other studies or methods, and identify the limitations and uncertainties of the data integration. Data interpretation can help translate the data into meaningful insights and actionable recommendations.
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Data interpretation requires intuitive thinking and biologically sound judgments. Statistical analysis, such as pathway enrichment analysis, can be incredibly useful, but mostly riddled with redundancy. Therefore, interpreting such enrichments, needs intellectual/manual collation of the results into a meaningful biological summary. A key power of omics is gaining a bird's eye view of everything happening inside a disease and understanding its heterogeneity. Instead of finding answers themselves, omics researchers seek tailored solutions. Biology is a much more complex process, since (cell) divisions in biology only result in multiplication unlike fractions as in mathematics.
The fourth step is to visualize the data, which means to present the data and the results in a clear and attractive way to communicate the main findings and messages. There are different types of data visualization, such as plots, charts, graphs, maps, or tables, and different tools and software for creating them, such as R, Python, Excel, or Tableau. You should choose the appropriate type and tool for your data and your audience, and follow some best practices, such as using colors, labels, legends, titles, and captions. Data visualization can help convey the data in a concise and engaging way and enhance the impact and dissemination of the results.
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Despite most omics data representations looking fancy in publications, the ultimate goal must be to render intuitive summaries that can be easily understood by readers. Instead of showing massive heatmaps or furballs, one glance at the figure should tell the story. Thus, learning how to consolidate data and convey the findings into a simple summary is the most effective way to communicate the main findings. See Figure 6, in this research https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1000527 and Figure 5E in this research https://doi.org/10.3390/biomedicines10112720)
The fifth step is to report the data, which means to document the data and the results in a comprehensive and transparent way to share the details and outcomes of the data integration process. This may involve writing a report, a paper, a poster, or a presentation, depending on the purpose and the audience of the data integration project. You should include the following elements in your data reporting: the background and motivation of the project, the data sources and platforms, the data harmonization and integration methods and tools, the data interpretation and visualization results and findings, and the conclusions and recommendations. You should also cite the relevant references and acknowledge the data contributors and collaborators. Data reporting can help demonstrate the rigor and validity of the data integration and facilitate the reproducibility and reuse of the data.
The sixth step is to share the data, which means to make the data and the results accessible and available to other researchers and stakeholders who may benefit from them or contribute to them. This may involve depositing the data and the results in a public repository, such as GEO for gene expression data or MetaboLights for metabolomics data, or publishing them in an open access journal or platform, such as BioRxiv for preprints or Zenodo for datasets. You should provide the metadata and the license information for the data and the results, and follow the FAIR principles, which are: findable, accessible, interoperable, and reusable. Data sharing can help increase the visibility and impact of the data integration and foster the collaboration and innovation in the omics field.
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This is a very good article, we are just starting this process. What software would be best to use? Is there anything off the shelf? Any feedback will be great. Many thanks!
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