cgCorrect: a method to correct for confounding cell–cell variation due to cell growth in single-cell transcriptomics
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Abstract
Accessing gene expression at a single-cell level has unraveled often large heterogeneity among seemingly homogeneous cells, which remains obscured when using traditional population-based approaches. The computational analysis of single-cell transcriptomics data, however, still imposes unresolved challenges with respect to normalization, visualization and modeling the data. One such issue is differences in cell size, which introduce additional variability into the data and for which appropriate normalization techniques are needed. Otherwise, these differences in cell size may obscure genuine heterogeneities among cell populations and lead to overdispersed steady-state distributions of mRNA transcript numbers. We present cgCorrect, a statistical framework to correct for differences in cell size that are due to cell growth in single-cell transcriptomics data. We derive the probability for the cell-growth-corrected mRNA transcript number given the measured, cell size-dependent mRNA transcript number, based on the assumption that the average number of transcripts in a cell increases proportionally to the cell’s volume during the cell cycle. cgCorrect can be used for both data normalization and to analyze the steady-state distributions used to infer the gene expression mechanism. We demonstrate its applicability on both simulated data and single-cell quantitative real-time polymerase chain reaction (PCR) data from mouse blood stem and progenitor cells (and to quantitative single-cell RNA-sequencing data obtained from mouse embryonic stem cells). We show that correcting for differences in cell size affects the interpretation of the data obtained by typically performed computational analysis.
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Correcting for cell size via normalization, or dedicated tools such as cgCorrect, also partially corrects for cell cycle effects in scRNA-seq data.
“Thus, correcting for cell size via normalization, or dedicated tools such as cgCorrect (Blasi et al, 2017), also partially corrects for cell cycle effects in scRNA‐seq data.”
From Current best practices in single-cell RNA-seq analysis: a tutorial (2019) · cites this paper as Blasi et al, 2017
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- Authors
- Blasi, T., Buettner, F., Strasser, M. K., Marr, C., & Theis, F. J.
- Affiliations
- Helmholtz Munich (DE)
- Corresponding author
- Marr, Carsten
- Theis, Fabian J
- Venue
- Physical Biology
- Publisher
- IOP Publishing
- Published
- 2017-05-11
- Volume
- 14
- Issue
- 3
- Pages
- 036001
- ISSN
- 1478-3967 (ISSN-L)
- 1478-3975
- OpenAlex
- W2950872423
- Cited by
- 18
- References
- 59
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 7 · 2020: 3 · 2019: 4
- FWCI
- 0.78
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Physical Biology (publishedVersion)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
- PubMed (publishedVersion)
- Site cant be reached (submittedVersion, cc-by-nc-nd)
- Funders
- Deutsche Forschungsgemeinschaft (SPP 1356)
- Studienstiftung des Deutschen Volkes
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Single-cell and spatial transcriptomics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene Regulatory Network Analysis
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gene expression and cancer classification
- Keywords
- cell size heterogeneity, single-cell transcriptomics, normalization, stationary distribution, cell cycle, mouse embryonic stem cells, gene expression regulation, single-cell RNA sequencing
- MeSH terms
- Models, Genetic, RNA, Messenger, Gene Expression, Computational Biology, Gene Expression Profiling, Cell Size, Cell Enlargement
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