Abstract
Huge numbers of cells form an adult animal body, ranging from several thousands in Placozoa and small nematodes to many billions in mammals. Cells are classified into separate groups known as cell types by their morphological and biochemical features. Six to several hundreds of spatially ordered cell types are recognized in different animals. This complex organization develops from one cell, a zygote, during ontogeny, and its dynamic equilibrium is often maintained in the adult body. One of the key challenges in biology is to understand the mechanisms that sustain the reproducible development of a complex ordered cell ensemble such as the animal body from a single cell. How cells with identical genomes stably maintain one of the numerous possible phenotypes? How the cell differentiation lineage is selected during development? What genes play a key role in maintaining cell identity, and how do they determine expression of other genes characteristic of the relevant cell type? How does the basically stochastic nature of transcription in an isolated cell affect the stability of cell identity, the selection of a cell lineage, and the variability of cell responses to external stimuli? Better-grounded answers to these questions have become possible with recent progress in single-cell genome-wide analysis techniques, which combine the high throughput of biochemical methods and the differential nature of microscopy. The techniques are still in their infancy, and their further development will certainly revolutionize many fields of life sciences and, in particular, developmental biology. Here, we summarize the main results that have been obtained in single-cell genome-wide analyses and describe the nongenetic cell-to-cell variability in animals.
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Abbreviations
- aRME:
-
Autosomal random monoallelic expression
- AT1 and AT2 cells:
-
Type 1 and type 2 alveolar cells
- ATAC-seq:
-
Assay for transposase-accessible chromatin with sequencing
- BMDCs:
-
Bone marrow-derived dendritic cells
- BS-seq:
-
Bisulfite sequencing
- CAP:
-
Circular a posteriori projection
- ChIA-PET:
-
Chromatin interaction analysis by paired-end tag sequencing
- ChIP-seq:
-
Chromatin immunoprecipitation and sequencing
- DamID:
-
DNA adenine methyltransferase identification
- EM algorithm:
-
Expectation–maximization algorithm
- FACS:
-
Fluorescence-activated cell sorting
- FISH:
-
Fluorescence in situ hybridization
- FISSEQ:
-
Fluorescent in situ sequencing
- GRN:
-
Gene regulatory network
- hESC:
-
Human embryonic stem cell
- iPS:
-
Induced pluripotent stem cell
- LAD:
-
Lamina-associated domain
- LADR:
-
lncRNA activated during reprogramming
- LMR:
-
Low methylation region
- lncRNA:
-
Long noncoding RNA
- LPS:
-
Lipopolysaccharides
- MALDI:
-
Matrix-assisted laser desorption/ionization
- MeDIP-seq:
-
Methylated DNA immunoprecipitation and sequencing
- mESC:
-
Mouse embryonic stem cell
- NSC:
-
Neural stem cell
- PRC-2:
-
polycomb repressive complex 2
- Race ID:
-
Rare cell type identification algorithm
- SC:
-
Single-cell
- SC-seq:
-
Single-cell sequencing based
- TAD:
-
Topologically associating domain
- t-SNE:
-
t-distributed stochastic neighbor embedding
- Th2:
-
Type 2 helper T cells
- TIVA:
-
Transcriptome in vivo analysis
- UMI:
-
Unique molecular identifier
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This work was supported by the Russian Science Foundation (project #14-14-01088).
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Golov, A.K., Razin, S.V. & Gavrilov, A.A. Single-cell genome-wide studies give new insight into nongenetic cell-to-cell variability in animals. Histochem Cell Biol 146, 239–254 (2016). https://doi.org/10.1007/s00418-016-1466-z
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DOI: https://doi.org/10.1007/s00418-016-1466-z