The scale of RNA activity in plant cells is staggering. Eukaryotic genomes undergo pervasive, genome-wide transcription, generating far more RNA than is needed to encode proteins. These molecules are anything but silent players, the authors emphasize. Their activities are determined not only by their nucleotide sequences but also by multiple regulatory layers, including processing, turnover, chemical modifications, and three-dimensional folding, each contributing critically to how a plant ultimately looks and performs. Over the past decade, high-throughput sequencing, single-molecule sequencing, and precise genome editing have propelled plant RNA biology forward, deepening understanding of RNA regulatory mechanisms and functional networks to a degree that would have been unthinkable a generation ago.

The research paradigm itself has shifted. Plant RNA biology long centered on the model plant Arabidopsis thaliana, a small weed in the mustard family that has served as the workhorse of plant genetics for decades. The review documents how the field has now expanded to a wide range of vital crops, including rice, maize, and wheat. This migration from model organism to staple crop matters enormously for agriculture, because insights into RNA regulatory networks translate directly into genetic resources for crop improvement, including stress-resistant breeding, quality enhancement, and yield promotion. In-depth dissection of these intricate networks, the authors argue, improves the theoretical framework of plant molecular biology while providing critical foundations for applied breeding programs.

The review is structured into eight progressive modules that trace the regulatory mechanisms and agricultural potential of plant RNAs step by step. The first section follows the life cycle of messenger RNA, from its birth through splicing and 3-prime end formation to its eventual degradation. Alternative splicing, particularly intron retention, and 3-prime end processing emerge as key mechanisms shaping transcriptome diversity in plants. The authors also detail the 5-prime-to-3-prime and 3-prime-to-5-prime decay pathways that precisely regulate transcript stability, along with the sophisticated quality control systems that safeguard protein synthesis. These include nonsense-mediated decay, no-go decay, and nonstop decay, surveillance mechanisms that eliminate aberrant transcripts before they can wreak havoc on the cell.

Perhaps the most conceptually striking section redefines the biological functions of classical housekeeping non-coding RNAs, including ribosomal RNAs, transfer RNAs, small nucleolar RNAs, and small nuclear RNAs. For years, these molecules were viewed as humble infrastructure, participating only in translation and splicing. The review confirms that they do far more: they can respond to environmental signals, generate functional small RNAs, and participate in plant developmental regulation, stress adaptation, chromatin remodeling, and gene silencing. This reframing suggests that even the most familiar RNA species in the cell harbor regulatory capacities that remain largely untapped in crop science, a finding with significant implications for how researchers screen for agriculturally useful RNA functions.

Small RNAs and long non-coding RNAs receive their own dedicated treatments. The small RNA section elucidates the biogenesis pathways and action modes of microRNAs and various classes of small interfering RNAs, revealing that these molecules regulate plant growth, development, and stress responses through target cleavage, translational repression, and DNA methylation. The non-cell-autonomous movement of small RNAs between cells, and their cross-kingdom transport, are identified as core links connecting developmental regulation with stress adaptation. The long non-coding RNA section overturns the early perception of these transcripts as transcriptional noise, concluding that they participate in flowering, reproduction, root development, and stress responses through multiple strategies, including recruiting chromatin modification complexes, sequestering microRNAs, modulating protein activity, and even encoding functional small peptides.

Two emerging fields receive forward-looking coverage. The first is RNA higher-order structure, where cutting-edge in vivo structural profiling technologies are uncovering how RNA secondary structures influence splicing, translational regulation, and temperature sensing. The review highlights the value of TPP riboswitches and ribosnitches, sequence-variation-mediated RNA structural remodeling elements, in regulating crop agronomic traits. The second is the rapidly expanding field of RNA chemical modifications. The authors systematically summarize non-canonical cap structures such as m7G and NAD, and internal modifications including m6A, m5C, and ac4C, elaborating the writer, eraser, and reader protein systems that install, remove, and recognize these chemical tags. RNA modifications, they conclude, constitute a crucial post-transcriptional regulatory layer that extensively modulates plant development, immunity, and stress responses.

The agricultural payoff is where the review becomes most concrete. Artificial modification of microRNAs and long non-coding RNAs can effectively enhance crop yield, stress tolerance, and nutrient use efficiency. Beyond endogenous RNA manipulation, RNA interference technologies offer innovative and eco-friendly strategies for protecting crops from diseases and pests. Spray-induced gene silencing allows farmers to apply double-stranded RNA directly to plants, while microbe-induced gene silencing harnesses beneficial microorganisms to deliver silencing signals. Cross-kingdom RNAi mechanisms, in which small RNAs move between species, underpin these approaches. Together, they provide green alternatives to traditional chemical pesticides, overcoming the environmental limitations of conventional crop protection methods at a time when sustainable agriculture has become an urgent global priority.

The final module looks ahead, identifying the core challenges and opportunities that will define the next phase of plant RNA biology. The authors propose the necessity of dissecting the synergistic mechanisms among diverse RNA regulatory pathways, since no single RNA class operates in isolation. They call for advancing single-cell-level research on RNA dynamics, which would reveal how regulatory networks differ across the specialized cell types that make up plant tissues. They also point to ncRNA editing, RNA synthetic biology, novel RNAi technologies, and multi-tool combined gene editing systems as sources of brand-new technical support for precision plant breeding and the development of green, sustainable agriculture.

Taken as a whole, the review bridges a persistent gap between fundamental theoretical research on plant RNAs and practical agricultural application. It provides important theoretical references and frontier directions for deciphering plant RNA regulatory networks, addressing food security, and promoting the high-quality development of sustainable agriculture. The collaboration of sixteen experts across institutions including Tsinghua University, Sun Yat-sen University, Southern University of Science and Technology, the Chinese Academy of Sciences, Peking University, and Fudan University reflects the maturity the field has reached. As climate change intensifies pressure on global crop production, the ability to read, understand, and ultimately engineer the RNA regulatory landscape of plants may prove one of the most consequential tools in modern agricultural science.

Subject of Research: RNA regulatory mechanisms in plants and their application to crop improvement

Article Title: New comprehensive review maps the RNA regulatory landscape in plants

Article References: New comprehensive review maps the RNA regulatory landscape in plants. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: plant RNA biology, non-coding RNAs, microRNAs, RNA modifications, m6A, RNA interference, alternative splicing, lncRNAs, small RNAs, crop improvement, food security, sustainable agriculture

The research, led by Xiaoyu Zhang, Kaiyun Fu, and colleagues at the Xinjiang Academy of Agricultural Sciences together with collaborators at the Chinese Academy of Sciences, focused on a class of regulatory molecules known as competing endogenous RNAs, or ceRNAs. The ceRNA hypothesis proposes that different RNA transcripts, including messenger RNAs that encode proteins as well as non-coding RNAs that do not, can communicate with one another by competing for the same microRNA molecules. MicroRNAs are short RNA fragments that bind to complementary sequences on target transcripts and suppress their activity. When a non-coding RNA sponges up a shared microRNA, it effectively shields other transcripts from repression, creating a regulatory network in which abundance of one RNA can indirectly control the expression of many others.

To map this network in a starving insect, the team performed whole-transcriptome sequencing on T. absoluta larvae under two conditions: larvae feeding on fresh tomato leaves and larvae subjected to starvation. By comparing the complete repertoire of expressed molecules between the two groups, they identified a striking number of differentially expressed transcripts. In total, the analysis revealed 46 differentially expressed microRNAs, 2,143 differentially expressed messenger RNAs, 391 differentially expressed long non-coding RNAs, and 1,635 differentially expressed circular RNAs. Circular RNAs, which are formed when RNA strands are joined head-to-tail into closed loops, are particularly stable molecules and have emerged as potent microRNA sponges in many organisms, making their large-scale differential expression especially noteworthy.

With these differential expression profiles in hand, the researchers constructed putative regulatory networks linking the different RNA classes. Using computational prediction of binding sites combined with expression correlation analyses, they built both lncRNA–miRNA–mRNA and circRNA–miRNA–mRNA interaction networks. These networks represent hypotheses about which non-coding RNAs might be titrating away which microRNAs, and consequently which protein-coding genes might be released from repression or placed under additional control during starvation. The scale of the networks suggests that ceRNA-mediated crosstalk is a substantial component of the leafminer’s stress response rather than a marginal curiosity.

Functional enrichment analysis of the genes embedded in these networks provided the first clues about what the regulation is actually accomplishing. The differentially expressed messenger RNAs, the predicted microRNA target genes, and the host genes that give rise to circular RNAs were predominantly associated with chitin metabolism, lipid catabolism, fatty acid biosynthesis, and detoxification pathways. Each of these categories makes biological sense for a starving insect. Chitin is the structural polymer of the insect cuticle and gut lining, and its remodeling may reflect the physiological strain of fasting. Lipid catabolism and fatty acid metabolism are the classic fallback energy pathways when dietary carbohydrates and proteins run out, allowing the animal to mobilize stored fat reserves. Detoxification pathways, meanwhile, may help the insect cope with the metabolic byproducts of starvation or maintain its chemical defenses.

Deeper pathway analysis using the Kyoto Encyclopedia of Genes and Genomes reinforced this metabolic picture. Significant enrichment was observed in AMPK signaling, a conserved cellular energy-sensing pathway that switches on when intracellular energy levels fall and orchestrates the shift from energy consumption to energy production. Insulin signaling was also enriched, reflecting its central role in coordinating growth, nutrient storage, and mobilization in response to nutritional state. The biosynthesis of unsaturated fatty acids appeared as another significantly enriched pathway, consistent with the idea that starving larvae adjust the composition of their membrane lipids and fuel reserves to survive the crisis. Together, these pathways sketch a coherent strategy: sense the energy deficit, reroute metabolism toward stored fats, and adjust cellular infrastructure accordingly.

Perhaps the most striking single finding is the identification of two microRNAs, miR-6497a and miR-6498-5p, as putative key regulatory hubs within the ceRNA network. These two microRNAs were predicted to interact with multiple differentially expressed long non-coding RNAs, circular RNAs, and messenger RNAs simultaneously, placing them at the center of a dense web of potential crosstalk. In the ceRNA framework, a hub microRNA whose binding is contested by many sponges can exert broad, condition-dependent control over entire functional modules. If experimental work confirms these interactions, miR-6497a and miR-6498-5p would represent master switches that help determine how the leafminer’s metabolism is reconfigured when food disappears.

The study’s significance extends well beyond basic biology. Tuta absoluta, native to South America, has spread rapidly across Europe, Africa, and Asia since its initial invasions and remains a persistent threat to tomato production worldwide. Its capacity to survive unfavorable conditions, including gaps in food availability between crops or during dispersal, contributes to its invasive success and complicates control efforts. Current management relies heavily on chemical insecticides, against which the species has already evolved resistance to multiple modes of action. This has intensified interest in RNA interference as an alternative: double-stranded RNA molecules can be designed to silence essential pest genes with high specificity, and several RNAi-based products are in development for agricultural use. The ceRNA networks described in this study offer a catalog of candidate targets, particularly the hub microRNAs and the non-coding RNAs that regulate them, whose disruption could impair the pest’s ability to withstand starvation and other stresses encountered in the field.

The work also adds to a growing appreciation that non-coding RNAs are not background noise but active participants in how organisms respond to their environments. Long non-coding RNAs and circular RNAs have been implicated in stress responses in many species, but their roles in agricultural insect pests remain poorly charted. By integrating all four major RNA classes in a single analysis, the researchers demonstrated a methodology that other pest biologists can replicate, connecting transcriptome-wide discovery with functional interpretation. The authors caution that the networks are putative, resting on computational prediction and expression correlation, and that experimental validation will be needed to confirm individual interactions and to test whether manipulating these RNAs genuinely compromises the insect’s stress tolerance.

Even so, the study marks an important step in the molecular dissection of one of agriculture’s most notorious adversaries. It shows that when the tomato leafminer goes hungry, it does not simply slow down; it activates a coordinated, multi-layered RNA regulatory program that touches energy sensing, fat metabolism, structural remodeling, and detoxification all at once. Understanding that program in detail, and learning to break it, could give crop scientists a much-needed new angle of attack against a pest that has repeatedly outmaneuvered conventional control methods. For now, the humble non-coding RNA molecules once dismissed as transcriptional clutter have emerged as promising new players in the ongoing arms race between farmers and the insects that threaten their harvests.

Subject of Research: ceRNA regulatory networks in Tuta absoluta adaptation to starvation stress

Article Title: Integrated whole‑transcriptome analysis reveals ceRNA regulatory networks underlying Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) adaptation to starvation stress

Article References: Zhang, X., Wen, Y., Jia, Z., Wang, X., Wu, J., Ding, X., Guo, W., & Fu, K. (2026). Integrated whole‑transcriptome analysis reveals ceRNA regulatory networks underlying Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) adaptation to starvation stress. BMC Genomics. https://doi.org/10.1186/s12864-026-13273-x

Image Credits: AI Generated

DOI: 10.1186/s12864-026-13273-x

Keywords: Tuta absoluta, tomato leafminer, ceRNA, non-coding RNAs, microRNAs, lncRNAs, circRNAs, starvation stress, transcriptomics, AMPK signaling, lipid metabolism, RNAi pest control

The research team used MDCC-MSB1 cells, a lymphoblastoid cell line transformed by Marek’s disease virus, as their infection model. This choice matters because CIAV is notoriously difficult to propagate efficiently in standard culture systems, and lymphoblastoid lines provide a permissive environment that approximates the immune cells the virus targets in living birds. By sequencing the full transcriptome of infected versus uninfected cultures, the investigators could detect expression shifts across all four major RNA classes simultaneously rather than examining each in isolation, an approach that reveals regulatory relationships that single-platform studies miss.

The scale of the transcriptional disruption was striking. In total, the team identified 2,590 differentially expressed genes, of which 526 were upregulated and 2,064 were downregulated. The overwhelming bias toward suppression suggests that CIAV infection broadly dampens host gene activity, a pattern consistent with the immunosuppressive character of the disease it causes. Within this total, 539 were protein-coding mRNAs, with 166 increased and 373 decreased in abundance, while the non-coding compartment dominated the response: 1,957 long non-coding RNAs changed expression, 295 up and 1,662 down, alongside 38 microRNAs and 56 circular RNAs.

That lncRNAs account for the majority of altered transcripts is one of the study’s most notable findings. Long non-coding RNAs regulate gene expression at transcriptional, post-transcriptional, and epigenetic levels, and their wholesale suppression during infection hints that CIAV may exploit or disrupt these regulatory layers to reprogram the host cell environment. Because lncRNAs often act in cis near the genes they control or in trans across the genome, their coordinated downregulation could amplify the effects of the mRNA changes observed in the same dataset.

Functional enrichment analysis of the differentially expressed genes pointed to several biological themes. Apoptosis, or programmed cell death, featured prominently, which aligns with the known capacity of CIAV to trigger apoptotic depletion of thymocytes and hematopoietic precursors in infected birds. Transcriptional regulation and phosphorylation-related processes were also enriched, indicating that the virus perturbs the cell’s control circuits at multiple levels. Immune signaling pathways emerged as major hubs, with the p53 tumor-suppressor pathway, the MAPK cascade, and the mTOR pathway all showing significant involvement, linking the viral infection to central nodes that govern cell survival, proliferation, and stress responses.

To move from correlation to candidate regulators, the authors validated a panel of key differentially expressed molecules by quantitative real-time PCR. The validated set included gga-miR-1306-5p, a chicken microRNA whose altered abundance may influence target mRNAs in immune pathways; ARHGEF12, a Rho guanine nucleotide exchange factor that connects extracellular signals to cytoskeletal and transcriptional responses; and three circular RNAs, circMCTP2 derived from the MCTP2 gene, circMAP3K5 derived from MAP3K5, and circPTEN derived from PTEN. Two additional coding genes, ODF1 and ZP2, were also confirmed, expanding the catalog of infection-responsive transcripts beyond the expected immune repertoire.

The circular RNA findings deserve particular attention. CircMAP3K5 and circPTEN are especially intriguing because their linear host genes sit squarely within the MAPK and PI3K-AKT signaling axes that the enrichment analysis flagged. Circular RNAs frequently function as microRNA sponges or protein scaffolds, and changes in their abundance during CIAV infection suggest a layer of post-transcriptional regulation that has been almost entirely unexplored in this viral system. The convergence of altered circular RNAs, microRNAs, and mRNAs within the same pathways strengthens the case that these networks are genuine targets of viral manipulation rather than incidental noise.

From the validated candidates, the team prioritized PTEN and ARHGEF12 as putative regulatory genes shaping CIAV pathogenesis. PTEN encodes a phosphatase that antagonizes the PI3K-AKT-mTOR axis, a pathway controlling cell growth, metabolism, and survival, and its circular RNA counterpart was among the validated differentially expressed transcripts. ARHGEF12, meanwhile, participates in Rho-mediated signaling with documented roles in hematopoietic cell behavior. Both genes occupy central positions in the predicted regulatory networks constructed from the transcriptomic data, making them logical entry points for functional follow-up experiments aimed at determining whether modulating their activity alters viral replication or the host cell fate decisions that follow infection.

The broader significance of the study lies in its contribution to controlling a disease that continues to burden poultry production worldwide. Chicken infectious anemia rarely kills through its acute symptoms alone; instead, it predisposes flocks to secondary viral, bacterial, and fungal infections by crippling immune function, which magnifies losses across the industry. Understanding which host pathways the virus subverts provides molecular targets for antiviral strategies and could inform vaccine design, particularly efforts to induce immune responses that block the immunosuppressive phase of infection. The dataset also supplies a reference transcriptomic resource for future comparative studies, including work with field isolates of differing virulence.

As with any cell-culture transcriptomics study, the findings represent a snapshot of one cell type at a defined stage of infection, and the authors note that further functional validation will be needed to confirm the regulatory roles of PTEN and ARHGEF12 in vivo. Nevertheless, by integrating four RNA species into a single coherent picture, the study demonstrates how whole-transcriptome sequencing can illuminate host-virus interactions that gene-by-gene approaches overlook. For a virus whose defining feature is quiet immune sabotage, seeing the full breadth of the host RNA response is an essential step toward anticipating, and eventually interrupting, the molecular conversations that make chicken infectious anemia such a persistent agricultural problem.

Subject of Research: Host transcriptomic responses to chicken infectious anemia virus infection in a chicken lymphoblastoid cell line

Article Title: Whole-transcriptome sequencing profiling reveals putative regulators and molecular insights into CIAV infection in MDCC-MSB1 cells

Article References: Dong, M., Zhao, Y., Shao, R., Zhang, X., & Liu, Y. (2026). Whole-transcriptome sequencing profiling reveals putative regulators and molecular insights into CIAV infection in MDCC-MSB1 cells. BMC Genomics. https://doi.org/10.1186/s12864-026-13366-7

Image Credits: AI Generated

DOI: 10.1186/s12864-026-13366-7

Keywords: chicken infectious anemia virus, CIAV, transcriptomics, RNA sequencing, MDCC-MSB1, non-coding RNAs, circular RNAs, microRNAs, lncRNAs, PTEN, ARHGEF12, poultry immunosuppression