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CHAPTER 10

Role of Omics in Natural Product-Based Drug Discovery

BHAGYABHUMI SHAH
1

1,*
, RUCHI YADAV2, NILAY SOLANKI1, and BHUMIKA PATEL
3

2


3


*Corresponding author
ABSTRACT
Alternative and complementary medicine often use bioactive compounds and naturally derived dietary products, such as polyunsaturated fatty acids, polyphenols, dietary fiber, and polysaccharides to treat and manage cataracts, cardiovascular, neurodegenerative and meta­bolic diseases. Omics methodologies, including bioinformatics, metabolomics, proteomics, transcriptomics, and genomics, have played a crucial role in biomedical research over the past three decades, advancing the field of systems biology by offering a comprehensive view of biomolecules, such as RNA, proteins, and metabolites within biological systems. Molecular methods utilized to analyze extensive datasets, including whole-genome sequencing and profiling of cellular protein expression, have become indispensable in drug discovery, and are frequently used for targeted drug discovery, isolation, and characterization. Although significant progress has been made, discovering effective targets for natural products remains a challenging and demanding endeavor that requires substantial time and effort. Recently, the successful integration of multiple omics-based technologies has become increasingly critical for this process, leading to the emergence of new panomics-based strategies. Constructive omics testing provides fresh and valuable insights to enhance drug development and applica­tion. The use of genomes, transcriptomics, proteomics, metabolomics, and bioinformatics in the search for potential natural drugs is covered in this chapter.

10.1 INTRODUCTION

Throughout the history of human civilization, natural products such as plants, animals, and minerals have played a significant role in the treatment of various diseases. This ancient
216 
wisdom has served as the foundation for modern medicine and will continue to be a valuable source for the development of future therapeutics. In fact, the discovery of new drugs has largely been attributed to natural products, particularly secondary metabolites, and compounds derived from them (Carlson, 2010). Prior to the development of modern omics technologies, the therapeutic potential of herbs was identified without any knowledge of their significance in scientific research, potential for experimental applications, molecular­level mechanisms, or possible uses. The bioactive substance known as “morphine” was initially isolated from the curative herb Papaver somniferum L. during the early 1800s. Today, various countries including, India, China, Japan, and Korea are at the forefront of scientific validation and investigation of traditional medicines. India is the primary producer of medicinal plants worldwide, with 2500 species originating from the country. Globally , there are approximately 21,000 distinct species of medicinal plants, as identified by the World Health Organization. Medicines derived from plants offer essential primary healthcare to around 3.5–4 billion individuals worldwide. A significant proportion of the population in developing countries, up to 80%, depend mainly on drugs derived from plants. Around 3.5–4 billion, people across the globe receive their primary healthcare through plant-based medicines. In developing countries, up to 80% of the population depends majorly on drugs that are derived from plants. The present drug discovery methodologies are still reaping the benefits of a systematic examination of the chemical structures of natural products and assimilating their distinctive pharmacophores into drug development procedures (Rodrigues et al., 2016). The active molecular scaffolds and pharmacophores in bioactive natural products function as motifs that bind with targets and are typically effective at penetrating cell membranes and disrupting biological or physiological phenotypes at the transcriptomic, genomic, proteomic, and metabolomic levels (Lee and Schneider, 2001; Singh et al., 2022). These peculiar perturbations resulting from natural products might suggest the nature of their interactions with specific molecular targets. Hence, the crucial initial phase of chemobiological research and innovative drug discovery involves successfully identifying the possible targets of these biological or pharmacological natural products (Rai et al., 2017).
The application of high-throughput omics techniques generates a vast amount of information. The massive amount of data produced by high-throughput omics platforms, including genomics, transcriptomics, proteomics, and metabolomics, can be utilized to predict the secondary metabolites’ bios ynthesis of medicinal plants, investigate plant genomes and evolution, and identify genes involved in producing biologically active compounds. Medicinal plants have the capacity to change with their surroundings and acquire new characteristics that help them survive. In order to improve human life, scientists examine medicinal plants using hypothesis-driven or data-driven research methods that combine omics methodologies, plant-based analysis, and biotechnology. The discovery of new biosynthetic pathways in plants, for their phylogenetic development and,
identication, including gene clusters found in species like poppies, barley, and Oryza sativa L., is being aided by initiatives such as the thousands of green plant transcriptome
projects, genome-guided research, the Medicinal Plant Genomics Consortium, and the Medicinal Plant Transcriptome Project. Notably, the poppy was found to contain a 10-gene
 217
cluster responsible for directing the biosynthesis of the antitumor alkaloid noscapine over 401 kb of genomic sequence. The utilization of advanced RNA sequencing techniques has
enabled comprehensive investigations of the expression proles of transcription factors
and enzymes on a global level. The MetNetDB database offers access to metabolomics and transcriptomics data of medicinal plants for the development of gene role hypotheses. Metabolomics, which involves the study of all the metabolites in a cell, was developed following the emergence of genomics, transcriptomics, and proteomics. In licorice (Glycyrrhiza uralensis), researchers identied two genes of cytochromes P450 that are responsible for the microbial production of glycyrrhetinic acid and triterpene saponin which is a natural sweetener.
Having a clear understanding of the cellular and molecular targets and action mechanisms of the lead compounds is crucial at the beginning stages of drug development. While natural products with pharmacological activities can affect several targets and signaling pathways, they may also result in undesired effects that disrupt treatment and lead to toxic
outcomes. As a result, structural modications or alterations in chemical or other properties
may be required to reduce off-target effects (Harvey et al., 2015). On the other hand, the
identication of new targets or previously unknown pharmacological effects of existing
drugs can expand their medical indications (Nandi et al., 2020). Therefore, identifying drug targets accurately is of utmost importance for the development of pharmaceuticals that
are both safe and effective. Target discovery has witnessed signicant advancements due
to bioinformatics, chemical genomics, probe-based chemical proteomics, and label-free proteomics. However, the process of identifying and validating drug targets can be time­consuming and challenging, and its complete success cannot always be guaranteed. Despite
signicant advancements in the target discovery, there are still considerable limitations. The precise identication of targets of various drugs plays a vital role in the creation of safe and efcient pharmaceuticals (Chang et al., 2016; Wright and Sieber, 2016; Chen et al.,
2020; Dai et al., 2020). One omics-based method alone may provide a restricted view of the intricate molecular targets within complex biochemical and physiological networks. Therefore, at the system-wide level, the integration of various approaches is imperative. By employing integrated multiomics methodologies, multiple potential targets and action
mechanisms for natural products can be simultaneously claried, dened, and validated,
leading to the development of viable drug candidates (Park et al., 2016; Zhang et al., 2021). Figure 10.1 shows different omics approaches for drug discovery from natural sources.

10.2 GENOMICS AND TRANSCRIPTOMICS IN NATURAL PRODUCT DISCOVERY

The expression of specific genes, along with alterations in the quantity and types of specific transcripts, can contribute to the regulation of various alterations in cell growth and apoptosis at a physiological level, as well as the development and progression of diseases (Pillutla et al., 2002). Cutting-edge specialized technologies based on genomics and transcriptomics have been employed for some time as novel techniques to identify and understand the mechanism of action of drugs (Brychtová et al., 2019).
218 
FIGURE 10.1 Role of omics-based technology for drug discovery from natural sources.
⏎
Genomics and transcriptomics are powerful tools in the discovery and characteriza­tion of natural products with potential therapeutic applications. Genomics involves the sequencing, analysis, and interpretation of an organism’s complete genetic material, while
transcriptomics focuses on the identication and quantication of RNA transcripts in a
sample. Genomics has been used to identify gene clusters involved in natural product
biosynthesis, providing a basis for the identication of new potential natural product
candidates. For example, genomic analysis of Streptomyces bacteria, which are known to produce many bioactive natural products, has led to the discovery of new antibiotics, anticancer agents, and other therapeutically relevant compounds. Transcriptomics has been used to identify molecular targets and mechanisms of action of natural products. By comparing the transcriptomes of cells or tissues treated with natural products to those of untreated cells, researchers can identify genes that are differentially regulated in response to treatment. This approach has been used to identify the molecular targets and signaling pathways of many natural products, including curcumin, resveratrol, and quercetin, all of which have potential therapeutic applications. Furthermore, genomics and transcriptomics have also been integrated into natural product discovery . By combining genomic data with transcriptomic data, researchers can identify gene clusters that are differentially expressed in response to natural product treatment, providing clues to the biosynthesis of bioactive compounds (Kersten et al., 2011). This approach has been used to identify new natural product candidates with potential therapeutic activity.
 219

10.2.1 CASE STUDIES AND EXAMPLES OF NATURAL PRODUCT DISCOVERY USING GENOMICS AND TRANSCRIPTOMICS

Different RNA interference (RNAi) techniques, such as small interfering RNA and shRNA (short hairpin RNA), have been widely used in genomic and transcriptomic research to confirm the biological effects of natural products on specific targets. These methods, referred to as “reverse genetics,” are invaluable for deciphering the function of genes and identifying new targets in a phenotype-based manner. High-throughput RNAi assays are frequently utilized to identify small-molecule sensitizers and inhibitors, as well as essential genes and synthetic lethal genes. The suppression of targeted genes can help elucidate key mechanisms and pathways implicated in the natural compounds’ activities by weakening cellular responses to a targeted molecule of interest (Hirota et al., 2012; Yin and Kassner, 2016; Chen et al., 2020). Through multiplex sequencing screening of pooled and barcoded shRNA libraries, the importance of ATP1A1 in regulating cellular sensitivity to aurilide B (a marine natural product) was revealed (Takase et al., 2017). However, differences in the mRNA levels may not necessarily reflect concomitant alterations in the protein expression and activity , potentially leading to false positives and off-tar get effects (Sachse et al., 2005; Marine et al., 2012). T o address this issue, promising techniques for the discovery and iden­tification of target research have been provided by the development of the CRISPR-Cas9 genome editing technology (Hsu et al., 2014; Knight et al., 2018). DrugT argetSeqR utilizes high-throughput sequencing, CRISPR-Cas9, and computational mutation discovery-based genome editing to present a novel approach for identifying targets of small bioactive molecules. The application of this approach led to the identification of kinesin-5 as the target of the synthetic anticancer agent called “ispinesib” and “dihydroorotate dehydro­genase,” which was identified as a possible target for the treatment of acute myeloid leukemia. Furthermore, the natural product “isobavachalcone” which is derived from the plant used in traditional Chinese medicine (TCM) called Psoralea corylifolia and inhibits the activation of an enzyme called dihydroorotate dehydrogenase, which was validated by using techniques such as thermal shift assay, nuclear magnetic resonance (NMR), isothermal titration calorimetry experiments, following a CRISPR screening (Kasap et al., 2014; Wu et al., 2018). In summary, genomics and transcriptomics are powerful tools that have greatly contributed to the discovery and characterization of natural products with therapeutic potential. The integration of these approaches has led to significant advances in the domain of discovering drugs from natural sources.
The hundreds of therapeutic plants have had their transcriptomes analyzed including Rhodiolaalgida, Salvia sclarea, Taxus mairei (Zhang et al., 2014), Caryophyllales (Yang et al., 2015), Oenothera (Hollister et al., 2015), and Polygonum cuspidatum which are stored in numerous databases such as National Centre for Sequence Read Archive, Gene Expression Omnibus, National Centre for Biotechnology Information, and PubMed. By using high-throughput comparative transcriptomics, it is possible to analyze and
compare the transcriptomes of medicinal plants more efciently than using comparative
genomics. Transcriptomics is a powerful approach for obtaining genomic information from many medicinal nonmodel plants that do not have a reference genome. The analysis of
220 
transcriptomes can help identify important features related to the production of secondary metabolites and explore molecular mechanisms that are relevant to pharmaceuticals (Hao et al., 2011, 2012, 2015). Researchers have utilized transcriptome data from Podophyllum hexandrum Royle to identify six enzymes involved in the biosynthetic pathway of podophyllotoxin, which is a natural precursor of the anticancer molecule etoposide used in chemotherapy. To do this, they selected several candidate genes and coexpressed them in Nicotiana benthamiana Domin, which allowed them to identify these enzymes involved in the podophyllotoxin biosynthesis (Yamazaki et al., 2013).
In summary, genomic studies of medicinal plants can provide valuable insights into the source, adaptation, growth, cultivation, differentiation, genetic variations, epigenetic
control, genetic diversity, genetic proling, genotyping, genes, regulatory sequences,
metabolic pathways, RNA editing sites, and secondary metabolites, as well as their regulatory mechanisms. In particular, in genomes with elevated levels of repetitive sequences and genetic diversity , this process can be expensive and demanding. Compared to comparative
genomics, studying the gene expression proles of medicinal plants through transcriptomics
is considered a more feasible option as it can provide intricate connections between genes and the metabolites they produce, gene expression patterns, important traits, and the underlying molecular mechanisms driving the synthesis of secondary metabolites and
metabolic pathways, such as podophyllotoxin, avonoid, terpenoid-derived tanshinones,
iridoids, salvianolic acid, and terpenoids (Pandita et al., 2021).

10.2.2 LIMITATIONS AND CHALLENGES OF USING GENOMICS AND TRANSCRIPTOMICS IN NATURAL PRODUCT DISCOVERY

While genomics and transcriptomics have great potential for natural product discovery, there are also some limitations and challenges that need to be addressed. Some of these limitations and challenges (García-Cañas et al., 2010; Pandita et al., 2021) include the following.

One of the biggest challenges of using genomics and transcriptomics in natural product discovery is the lack of comprehensive genomic data for many microorganisms that produce natural products. This can limit the ability to identify novel natural products and their biosynthetic pathways.

Changes in gene expression levels using RNAi or CRISPR-Cas9 gene editing can result in off-target effects, which can lead to false positives and misinterpretation of data. Careful design and validation of experiments are crucial to minimize these effects.
 221

Genomic and transcriptomic techniques can be technically challenging and require specialized equipment and expertise. High-throughput sequencing and bioinformatics analysis can also be time-consuming and computationally intensive.

Even with the help of genomic and transcriptomic data, it can still be challenging to identify novel natural products and their biosynthetic pathways. It may be necessary to use additional screening methods or to engineer microorganisms to produce novel compounds.

Despite advances in genomics and transcriptomics, there is still much to learn about the biology of natural products and their interactions with biological systems. This can make it difficult to design experiments and interpret results.
In conclusion, while genomics and transcriptomics hold great promise for natural
product discovery, there are also signicant challenges that need to be overcome to fully
realize their potential. Addressing these challenges will require continued technological advancements, collaboration between researchers with different expertise, and a better understanding of the biology of natural products.

10.3 PROTEOMICS AND METABOLOMICS IN NATURAL PRODUCT DISCOVERY

Proteomics and metabolomics are complementary approaches that can be used to identify and characterize natural products and their interactions with biological systems (W ang et al.,
2016). Proteomics is a powerful research method for investigating the effects of drugs on proteins and exploring cell signaling pathways. Proteomics plays a vital role in the study of medicinal plants by providing insights into protein structures, functions, and modifica­tions, including protein post-translational alterations such as phosphorylation, acetylation, glycosylation, and proteolysis of protein. This technique is valuable for authenticating these modifications and comprehending interactions of protein–protein in both in vitro and in vivo settings. Moreover, it can be useful in identifying the effects of disease progression and drug treatments on protein modifications. Proteomics enables researchers to study the mechanism of action of drugs by detecting alterations in proteins and identifying potential drug targets. Proteomics is also useful in predicting protein targets of bioactive compounds found in the TCM and understanding the mechanisms of TCM in cancer cells and interac­tions of various proteins and drugs at a cellular level (W ang et al., 2015). Extensive studies have been conducted by researchers on flavonoids, glycosides, terpenoids, and other
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secondary metabolites present in TCM plants through proteomics and found that they have antitumor activity in different cancers by targeting the mitochondria in malignant tissue (Liu and Guo, 2011).
Metabolomics is the study of small molecules, including metabolites, lipids, and other biochemicals, involved in cellular processes and their regulation. Metabolomics is vital in the plant kingdom because plants produce primary and secondary metabolites in vast amounts. It is a powerful tool for drug development and the discovery of novel chemical compounds (NCCs). Metabolomics enables the discovery of secondary metabolites in
medicinal plants, as well as the identication of biomarkers for human diseases, and high-
throughput screening for drug evaluation, making it a promising area for the improved exploitation of therapeutic plants (Wishart, 2016).
Various techniques are used for protein and metabolite proling in natural product
discovery. Liquid chromatography-mass spectrometry and NMR spectroscopy are
both powerful techniques used for the identication, quantication, and structural characterization of metabolites in the eld of metabolomics (Rochfort, 2005). Imaging
mass spectrometry is a technique that combines the spatial resolution of microscopy with the analytical power of mass spectrometry (MS), providing a powerful tool for the
visualization and identication of metabolites (Spraker et al., 2020). MS-based databases
and software tools, such as MassBank and Metlin, can be used to identify metabolites based on their mass spectra (Xiao et al., 2012). Metabolite annotation can be challenging, particularly for novel or structurally complex compounds, and often requires additional experimental validation. Proteomic and metabolomic data can be used to identify enzymes and biosynthetic pathways involved in natural product production, as well as to predict the structures of novel natural products. Bioinformatics tools, such as genome mining
and pathway prediction software, can aid in the identication of potential biosynthetic
pathways. Proteomics and metabolomics can be used to study the regulation of natural product biosynthesis, including the roles of transcription factors and signaling pathways. These techniques can also be used to identify potential targets for engineering natural product biosynthesis in heterologous hostsClick or tap here to enter text.

10.3.1 CASE STUDIES AND EXAMPLES OF NATURAL PRODUCT DISCOVERY USING PROTEOMICS AND METABOLOMICS

Several natural products have been discovered using proteomics and metabolomics. For example, the identification of a biosynthetic gene cluster (BGC) for the antifungal compound aspergillomarasmine A was facilitated by proteomic and metabolomic analysis (Perlatti et al.,
2020). Another example is the discovery of the antibacterial compound obafluorin using metabolomics. Examples of natural product discovery using proteomics and metabolomics include the identification of biosynthetic pathways for antibiotics, such as vancomycin and erythromycin, and the discovery of new natural products, such as the anticancer compound diazonamide A (Tsakou et al., 2020). Proteomic research has identified several proteins and peptides derived from medicinal plants that have pharmacological action.