Single-Cell RNA Sequencing for Plant Research: History
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George Bawa
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Xuwu Sun
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In recent years, advances in single-cell RNA sequencing (scRNA-seq) technologies have continued to change views on biological systems by increasing the spatiotemporal resolution of analysis to single-cell resolution. Application of scRNA-seq to plants enables the comprehensive characterization of both common and rare cell types and cell states, uncovering new cell types and revealing how cell types relate to each other spatially and developmentally. The use of sequencing technologies in plants to analyze genetic variation and metabolic regulation has played a major role in enhancing understanding of plant developmental processes and response to stimuli. However, the traditional sequencing method only generates average cell data and incapable of analyzing large number of cells, therefore losing cell heterogeneity information. The technical reason behind this limitation is that the material or study sample used for traditional sequencing contains several cells that are mixed to obtain whole-genome sequence information of all cells. However, the plant developmental process includes several regulatory factors and significant heterogeneity between different cells, which require a technology that enables cell heterogeneity and the discovery of new marker genes.

  • single-cell RNA-sequencing
  • cell-to-cell heterogeneity
  • transcriptomics
  • developmental trajectories

1. The Power of Single-Cell Sequencing Methodologies

After the first single-cell RNA sequencing (scRNA-seq) method was published [1], a large number of scRNA-seq methodologies have been proposed for scRNA-seq studies. scRNA-seq technologies have immense potential to reveal the mechanism of gene regulation and identification of cell-to-cell types and functions, which provide further insights into how developmental processes unfold within heterogeneous biological samples. With a global approach, somewhere in 2019, the Plant Cell Atlas (PCA) was established [2], with the objective of accumulating data for a broader understanding of the different plant types and combining high-resolution location information of nucleic acids, proteins, and metabolites within plant cells. The PCA uses scRNA-seq techniques to obtain genomic data from plant cells [2]. Plant and animal cells have certain things in common, especially their structures and roles. Plant cells are bigger than animal cells. Different plant species have different compositions and thicknesses according to the plant species, developmental level, specific tissue, and available environmental conditions [3]. These structural variations can possibly induce plant-specific, cell type-associated, and cell-positions-associated challenges in scRNA-seq analysis [4]. Therefore, the type of research design and planning is critical in scRNA-seq analysis in plant research.
Earlier technologies used to complete transcriptomic assays could only analyze hundreds of cells at very high resolution [5][6]. As a result of this limitation, these technologies have been replaced by high-throughput technologies, which can analyze thousands of cells at very high resolution. At the moment, the droplet-based method is commonly used for quantification purposes when dealing with large number of cells [7][8]. The remarkable expansion of scRNA-seq has been enabled by the development of droplet-based technology [7][8]. The droplet-based method can generate larger throughput of cells and lower sequencing costs per cell, and likewise the whole-transcript of scRNA-seq. The droplet-based method is best for accumulating large amounts of cells and identification of cell subpopulations of complex tissues, which makes this method dominant in the plant single-cell transcriptomics of Arabidopsis [4][9][10][11][12][13][14][15][16][17][18][19] and other plant species [20][21][22][23][24][25][26][27]. In addition, the application of the droplet-based technology into accessible commercial platforms has integrated this technology in modern plant research [4][10][11][12][13][14][15][22][25][26][27][28][29][30][31][32]. These studies prove how well single-cell transcriptomic can generate adequate information on cluster of cells according to their identity and response to stimuli. Aside from this commonly used droplet-based method is CEL-seq2, CEL-seq2 supports unique molecular identifier (UMI), and to lower amplification biases in CEL-seq2, mRNA amplification is often completed through in vitro transcription rather than PCR [24][33]. For the profiling of full-length RNA, the MARS-seq2.0 method, applied in a plate-based setup, has always been used [34]. This method provides variable information on the expression pattern of transcript isoforms [35] and detects abnormal expression of key genes. One limitation of the full-length sequencing technologies is the long processing time, which hinders its application in high-throughput single-cell analysis.
Despite the enormous contributions of these methodologies to making single-cell RNA sequencing the best approach for profiling rare or heterogeneous populations of cells, these technologies still have a number of challenges hampering the full functionality of this high-throughput sequencing approach. For example, the efficient isolation of individual cells, amplification of the genome, cost of querying the genome, long processing time, and interpretation of the data to reduce errors. Therefore, maximizing the quality of single-cell data and ensuring that the signals are separable from technical noise requires careful attention when designing single-cell experiments. However, the power of these technologies is only at an early stage, and considering scRNA-seq speed of expansion.

2. Application of scRNA-seq in Plant Research

Recent advances in scRNA-seq approaches provide more opportunities for identifying cellular and molecular differentiation trajectory of plant stem cells at the single-cell level. The different applications of single-cell transcriptomics discussed below indicate the power of these technologies for redefining cell identities based on molecular analysis and for the identification of new cell differentiation routes. The first application of single-cell technologies is to uncover cell subtypes from heterogeneous cell populations. So far, the most profiled tissue by single-cell RNA sequencing is the Arabidopsis primary root tip [4][9][10][14][15][17][19][29][31][36][37][38]. For example, because a plant’s transcriptome changes within the day, Apelt and colleagues developed a high-resolution single-cell transcriptomic map of Arabidopsis root at the end of the day and above-ground tissues at the end of the day and end of the night and uncovered key markers for both time points. They found that, depending on the time of the day, single-cell transcriptome alterations occur in distinct tissues to a variant degree. Further analysis indicated that the most similar tissue type between root and above-ground tissue is dividing cells. From these observations, they investigated a previously uncharacterized marker of that cluster (MERCY1) and showed its function in meristematic development, demonstrating single-cell transcriptome role in identifying transcriptional heterogeneity for below- and above-ground tissue at specific time points [17]. Similarly, in Arabidopsis root tissue, Graeff et al. [39] applied scRNA-seq analysis to study the impact of brassinosteroid (BR) signaling in the root through characterization of briTRIPLE mutants at single-cell resolution. They found that BR signaling does not affect cell proliferation or cellular development, but rather promotes cell division plane orientation and cellular anisotropy. Single-cell sequencing profiling can identify phenotypic variations among cell types. To examine epidermal cells phenotypes, scRNA-seq was used to profile the mutants root hair deficient (rhd6) and glabrous2 (gl2) (non-hair cells). The data generated indicated the cell identity phenotypes. Interestingly, further transcriptional investigation in the abnormal epidermal cells in rhd6 and gl2 showed that hair cells in rhd6 were not completely changed to non-hair cells, and non-hair cells in gl2 were not completely changed to hair cells [12]. Emerging expansion of single-cell gene expression studies has enabled researchers to investigate transcriptional regulation in dynamic development processes and heterogeneous cell samples. Gene expression of thousands of Arabidopsis root cells was investigated at the single-cell level. They found that root cells are heterogeneous, even within a single cell type. The pseudo time analysis showed that a single-cell root atlas reconstructed the continuous trajectory of root cell differentiation [36]. Single-cell RNA sequencing highly reconstructs cellular differentiation trajectories [4][9][12][13][14][15][16][19][24][25][26][28][29][32][37][40][41] Developmental trajectories have been successfully inferred from root single-cell transcriptome data [4][23][42][43][44][45]. Using single-cell transcriptomics, high-resolution profiling of Arabidopsis root was performed to create a plant cell atlas, which provided detailed information on developmental trajectories derived from the pseudo time analysis, which showed a finely resolved cascade of cell development from the niche through differentiation supported by high expression of interconnected genes [4].
In addition to the applications on Arabidopsis primary root tips, scRNA-seq has been applied to study Arabidopsis cotyledon development. For example, Liu and collaborators applied single-cell sequencing to analyze 5-day-old Arabidopsis cotyledons, identifying transcriptional networks regulating development from meristemoid mother cells (MMCs) to guard mother cells (GMCs) in the course of stomatal development [13]. More recently, the same team (Liu and collaborators) decided to apply single-cell analysis to uncover the mechanism underlying the early development of leaf veins in cotyledons. They found that the gene regulatory networks of some cell types showed potential roles of CYCLING DOF FACTOR 5 (CDF5) and REPRESSOR OF GA (RGA) in the early development and function of the leaf veins in cotyledons [46][47]. In brief, using single-cell sequencing, it can be determined the cell type and function in any heterogeneous sample more accurately than before, which indicates a technology that is transforming the scope and depth of transcriptome analysis of cell populations.
Despite the increased application of single-cell sequencing in Arabidopsis, recent years have witnessed a rise in scRNA-seq technology applications in other crops, such as rice and maize, which could possibly be the tip of the iceberg considering the speed of growth of these technologies in plant research. For example, Liu et al. sequenced more than 20,000 single cells of rice root tip alongside computational analysis and in situ hybridization studies, which identified major cell types and specific marker genes. Using comparative analysis of single-cell expression data between rice genotypes and between rice and Arabidopsis enhanced the study of divergent characteristics of root cell type transcriptomics [22]. In addition, Zhang et al. used single-cell sequencing and chromatin accessibility to survey rice radicals. Through profiling of individual root tip cells, developmental trajectories of epidermal cells and ground tissues were reconstructed, which uncovered the mechanism regulating cell fate determination in these cell lineages. Further analysis uncovered transcriptome profiles and marker genes for these cell types [45]. Aside from rice, several studies have applied scRNA-seq toward crop improvement in maize by highlighting the transcriptional differentiation in maize cells at high resolution. For instance, Xu et al. (2021) recently used scRNA-seq technology to profile 12,525 single cells from developing maize ears. This profiling generated a scRNA-seq map of an inflorescence. They showed how the generated data could help promote maize genetics through possible identification of genetic redundancy, formation of gene regulatory networks at cell level, and identification of key loci with high ear yielding characteristics. Similarly, in the same year, Bezrutczyk et al. applied scRNA-seq to study bundle sheath (BS) differentiation in maize. The single-cell sequencing profiling helped uncover cells with unique characteristics on the adaxial side of the BS in maize, which could be essential for bioengineering of crops [26]. Even before the studies of Xu et al. [27] and Bezrutczyk et al. [26], scRNA-seq analysis was used to identify the landscape of cell states and the state of cell-fate acquisition in the developing of maize seedlings’ shoot apex, which opens the green light for future studies of maize development at single-cell resolution [25]. Aside from rice and maize, scRNA-seq has been applied to study other plants’ developmental processes or responses to stimuli [21][48][49]. The increased application of these technologies in several plant species suggests that future research will indeed bring single-cell transcriptomics to crop species and thus lead the way for its incorporation into applied plant research.

3. scRNA-seq for Responses to Biotic and Abiotic Stresses

Genetically alike cells growing in the same environment can change at the cellular level, indicating why some cells survive more severe stress than others. Cell-to-cell modifications in gene expression have been associated with various stress survival levels; however, the reason why transcript level changes across the transcriptome in a single cell is still emerging. Plant developmental stages or cell type-specific responses to the environment can be studied using single-cell transcriptomics approaches. As single-cell RNA sequencing continues to expand in plant research, recent years have seen a rise in gene profiling studies under different environmental conditions using scRNA-seq analysis. Abiotic stress stimuli change gene expression patterns in cell type-specific ways; however, for a given stress type, dissimilar stresses can induce transcriptional regulation of roughly the same set of genes. For example, a gene expression profile of about 120,000 single cells was isolated from Arabidopsis root to compare cellular growth of roots under sucrose or without sucrose, which induced some variations in cell type frequency and tissue-specific gene expression as a result of these external factors. Pseudo time analysis was used to study the transcriptional alterations during endodermis development, which revealed some important genes that function during the differentiation of this tissue, which show Arabidopsis root development at high resolution [14]. As part of a single-cell sequencing experiment using Arabidopsis, heat stress was applied to a whole seedling to help address any possibility of heterogeneity among cell types in response to abiotic stress. They found significant changes in expressions, such as cell type-specific expressions. It was observed that cells in the outer layer of the root had significant modifications in expression than the inner cell types [10]. In rice, using scRNA-seq, different major rice cell types were identified in response to abiotic stress, which revealed the heterogeneity among cell types of plants’ response to abiotic stress [20]. Macronutrients play an essential role in plant development, and any depletion in their levels negatively regulates plant growth [15]. It has been shown that plants can manipulate their growth behavior to survive unfavorable conditions [15]. Wendrich and colleagues profiled Arabidopsis root response to low phosphate conditions in soil using high-resolution single-cell transcript expression atlas of Arabidopsis root. They illustrated how plants increase their root hair density for better soil penetration for nutrient absorption. The cell data showed enrichment of specific gene function responses in root hair cells, which were related to increased biosynthesis of cytokinin in vascular cells at reduced phosphate levels, suggesting a possibility of cytokinin signaling in root hair responses to low phosphate levels in vascular cells [15]. Another body of work established cellular profiling of Arabidopsis leaves response to wounding to study de novo regeneration (DNRR). The transcriptional network was studied by detaching Arabidopsis leaves to study DNRR. The single-cell profiling data showed gene expression patterns in the wounded area of detached leaves during adventitious rooting [50]. By analyzing the response of different cell clusters to different stress treatments, scRNA-seq can uncover cellular activities that are crucial to plant growth and adaptation to adversity while also revealing the balance of plant growth and resilience. Importantly, these studies demonstrated a possible heterogeneity among cell types of plants’ responses to abiotic stress using scRNA-seq approaches.

This entry is adapted from the peer-reviewed paper 10.3390/ijms23094497

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