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At least 127 records · Page 7Linked to original sources

Editing of SlWRKY29 by CRISPR-activation promotes somatic embryogenesis in Solanum lycopersicum cv. Micro-Tom.

At present, the development of plants with improved traits like superior quality, high yield, or stress resistance, are highly desirable in agriculture. Accelerated crop improvement, however, must capitalize on revolutionary new plant breeding technologies, like genetically modified and gene-edited crops, to heighten food crop traits. Genome editing still faces ineffective methods for the transformation and regeneration of different plant species and must surpass the genotype dependency of the transformation process. Tomato is considered an alternative plant model system to rice and Arabidopsis, and a model organism for fleshy-fruited plants. Furthermore, tomato cultivars like Micro-Tom are excellent models for tomato research due to its short life cycle, small size, and capacity to grow at high density. Therefore, we developed an indirect somatic embryo protocol from cotyledonary tomato explants and used this to generate epigenetically edited tomato plants for the SlWRKY29 gene via CRISPR-activation (CRISPRa). We found that epigenetic reprogramming for SlWRKY29 establishes a transcriptionally permissive chromatin state, as determined by an enrichment of the H3K4me3 mark. A whole transcriptome analysis of CRISPRa-edited pro-embryogenic masses and mature somatic embryos allowed us to characterize the mechanism driving somatic embryo induction in the edited tomato cv. Micro-Tom. Furthermore, we show that enhanced embryo induction and maturation are influenced by the transcriptional effector employed during CRISPRa, as well as by the medium composition and in vitro environmental conditions such as osmotic components, plant growth regulators, and light intensity.

Solanum lycopersicum↗

The transformative impact of stem cell core facilities in biomedical research.

Over the past three decades, advances in human pluripotent stem cell (hPSC) technologies, including induced pluripotent stem cells, gene editing, and 2D/3D models, have transformed biomedical research. These powerful tools have revolutionized disease modeling, drug discovery, and the development of advanced therapy medicinal products (ATMPs), while driving the establishment of stem cell core facilities. By providing specialized expertise, standardized workflows, and access to advanced technologies, these facilities support both fundamental and translational research, promote rigor and reproducibility, and foster collaboration. This manuscript highlights their role as hubs of excellence and discusses current challenges and future opportunities for the global stem cell community.

Humans↗

Genetic basis of escape-related locomotor performance in a wild-introgressed sheep population.

Rapid running and jumping are core components of escape responses in prey animals and provide measurable traits for studying locomotor performance in large mammals. The genetic basis of these escape-related locomotor traits remains poorly understood in large mammals, partly because repeated, standardized phenotyping under field conditions is challenging. Here, we leveraged a sheep population carrying argali-introgressed genetic components to map genetic variations associated with running speed and jumping height. Through controlled field experiments, automated high-resolution phenotyping, whole-genome analysis, and gene-edited mouse models, we identified two loci associated with escape-related locomotor traits: one in ABCC4 (Chr10:71,849,347; p = 5.03 × 10-7) linked to maximum running speed and another in GRID2 (Chr6:32,120,477; p = 1.30 × 10-9) associated with jumping height. Functional assays in knockout mice reveal that disruption of Grid2 reduces jumping ability, whereas Abcc4 knockout and knockdown increase running speed through enhanced heart contractility under stress. These results elucidated the genetic bases of wild-derived variations in affecting locomotor performance.

Animals↗

Directed evolution of engineered virus-like particles with improved production and transduction efficiencies.

Engineered virus-like particles (eVLPs) are promising vehicles for transient delivery of proteins and RNAs, including gene editing agents. We report a system for the laboratory evolution of eVLPs that enables the discovery of eVLP variants with improved properties. The system uses barcoded guide RNAs loaded within DNA-free eVLP-packaged cargos to uniquely label each eVLP variant in a library, enabling the identification of desired variants following selections for desired properties. We applied this system to mutate and select eVLP capsids with improved eVLP production properties or transduction efficiencies in human cells. By combining beneficial capsid mutations, we developed fifth-generation (v5) eVLPs, which exhibit a 2-4-fold increase in cultured mammalian cell delivery potency compared to previous-best v4 eVLPs. Analyses of v5 eVLPs suggest that these capsid mutations optimize packaging and delivery of desired ribonucleoprotein cargos rather than native viral genomes and substantially alter eVLP capsid structure. These findings suggest the potential of barcoded eVLP evolution to support the development of improved eVLPs.

Humans↗

The FIBRILLIN multigene family in tomato, their roles in plastoglobuli structure and metabolism.

Plastoglobuli (PG) are plant lipoprotein compartments, present in plastid organelles. They are involved in the formation and/or storage of lipophilic metabolites. FIBRILLINs (FBNs) are one of the main PG-associated proteins and are particularly abundant in carotenoid-enriched chromoplasts found in ripe fruits and flowers. To address the contribution of different FBNs, independently and in combination, to isoprenoid formation and sequestration, a multiplex gene editing approach was undertaken in tomato. This approach generated a suite of single and high-order fbn mutants that were shown to lack transcripts and respective protein products. The major PG-related FBNs in tomato chosen for this study are SlFBN1, SlFBN2a, SlFBN4 and SlFBN7a. When knocked out independently, functional redundancy was revealed. However, paralog-specific roles were detected regulating specific isoprenoids (e.g. plastochromanol 8) or plastidial esterification capability. In addition, high-order fbn mutants displayed altered isoprenoid chromoplast sequestration patterns, notably with a significant reduction in carotenes (phytoene and phytofluene) in the PG fraction. Proteomic analysis confirmed the absence of PG-core associated proteins, including NAD(P)H-ubiquinone oxidoreductase C1, tocopherol cyclase (VTE1) and phytol esterase (PES1/PYP). Perturbations to the ultrastructure of the plastid were revealed, with aberrant PG formation and morphology predominating in high-order mutants. Global lipidome profiles also highlighted broader changes directly affecting storage and plastid membrane lipids, for example, tri- and diacylglycerides and galactolipid species. Collectively, these results support both structural and metabolic roles of SlFBNs in PGs. The findings expose fundamental aspects of metabolic compartmentalisation in plant cells and the importance of lipoprotein particles for plastid integrity and functionality.

Solanum lycopersicum↗

mRNA therapy: A novel approach for retinal neurodegenerative diseases.

Retinal neurodegeneration remains a major cause of irreversible vision loss, yet current therapeutic options are limited in effectiveness. Although gene therapies have shown clinical potential, the overexpression platforms they rely on, such as adeno-associated virus DNA, are constrained by safety concerns, limited efficacy, and cargo size restrictions. In contrast, mRNA therapy has gained recognition as a compelling alternative, enabling rapid and efficient protein expression without the risk of genomic integration. This review synthesizes recent advances in mRNA engineering, delivery systems, and administration routes for retinal applications, and highlight strategies to enhance targeting, penetration, and controlled release through interdisciplinary collaboration between ophthalmology and bioengineering. In recent years, engineered mRNA formats, including chemically modified linear, circular, and self-amplifying RNA, can achieve higher translation efficiency within a tunable expression window. The transient nature and relatively low immunogenicity of in vitro transcribed mRNA support repeat dosing without insertional mutagenesis. Advances in nanocarriers, particularly lipid nanoparticles, have enabled preferential delivery to retinal neurons, Müller glia, and pigment epithelium via intraocular administration, while improving mRNA stability and transfection efficiency. In preclinical studies, mRNA has been widely used to deliver gene-editing tools, transcription factors, and supplementary functional proteins. In disease models such as optic nerve crush and laser-induced choroidal neovascularization, mRNA-based therapies enhance neuroprotection and suppress pathological angiogenesis in the injured retina, with favorable ocular safety profiles. However, it remains largely unexplored how the intrinsic advantages of mRNA therapy can be leveraged to develop tailored strategies for complex retinal disorders. Consistent with this gap, mRNA platforms have not yet been widely incorporated into retinal research or clinical practice. In parallel, clinical translation also lags: despite encouraging outcomes of lipid nanoparticle-mRNA formulations in preclinical models, no candidates have progressed into retinal clinical trials. This review draws on the complex pathology and therapeutic logic of retinal neurodegeneration. It proposes that mRNA therapy enables multitarget, repeatable, stage-specific interventions that align with the dynamic evolution of diseases and the requirements of combination therapy in retinal diseases. It may be used to support neuroprotection, axon regeneration, and neurovascular regulation. By integrating data across experimental models and modalities, this review outlines representative cases and experimental paradigms to guide rational trial design and carrier selection. Taken together, technical progress and evolving application strategies position mRNA therapy as a compelling therapeutic avenue for retinal neurodegeneration.

administration↗

Leveraging protein language models for cross-variant CRISPR/Cas9 sgRNA activity prediction.

MOTIVATION: Accurate prediction of single-guide RNA (sgRNA) activity is crucial for optimizing the CRISPR/Cas9 gene-editing system, as it directly influences the efficiency and accuracy of genome modifications. However, existing prediction methods mainly rely on large-scale experimental data of a single Cas9 variant to construct Cas9 protein (variants)-specific sgRNA activity prediction models, which limits their generalization ability and prediction performance across different Cas9 protein (variants), as well as their scalability to the continuously discovered new variants. RESULTS: In this study, we proposed PLM-CRISPR, a novel deep learning-based model that leverages protein language models to capture Cas9 protein (variants) representations for cross-variant sgRNA activity prediction. PLM-CRISPR uses tailored feature extraction modules for both sgRNA and protein sequences, incorporating a cross-variant training strategy and a dynamic feature fusion mechanism to effectively model their interactions. Extensive experiments demonstrate that PLM-CRISPR outperforms existing methods across datasets spanning seven Cas9 protein (variants) in three real-world scenarios, demonstrating its superior performance in handling data-scarce situations, including cases with few or no samples for novel variants. Comparative analyses with traditional machine learning and deep learning models further confirm the effectiveness of PLM-CRISPR. Additionally, motif analysis reveals that PLM-CRISPR accurately identifies high-activity sgRNA sequence patterns across diverse Cas9 protein (variants). Overall, PLM-CRISPR provides a robust, scalable, and generalizable solution for sgRNA activity prediction across diverse Cas9 protein (variants). AVAILABILITY AND IMPLEMENTATION: The source code can be obtained from https://github.com/CSUBioGroup/PLM-CRISPR.

CRISPR-Cas Systems↗

Expanding the scope of precision editing in seaweeds through the application of a novel CRISPR-associated nuclease 12a-aligned CRISPR system in Ulva prolifera.

Seaweeds, such as the fast-growing green alga Ulva prolifera, can be harnessed as valuable marine crops. The lack of scalable genome-editing tools hampers functional genomics to explore and elucidate algal molecular pathways with industrial importance. Here, we expanded precision genome modification in seaweeds by successfully demonstrating gene editing with a transgene-free AT-rich-targeting CRISPR-associated protein (Cas) system in U. prolifera. By evaluating various delivery buffers, comparing different Cas systems, and optimizing incubation temperatures, we determined suitable conditions for more widespread applicability of a novel Cas12a-aligned ST8 editor. We obtained >50 ST8-mediated knockout mutants of a toxin-based endogenous marker gene, UpAPT, at 28 °C post-delivery incubations. Our work diversified the applicable genome-editing tools in seaweeds, advancing algal functional genomics and providing more strategies to precisely target unexplored seaweed resources.

Ulva↗

Non-viral gene therapy for Duchenne muscular dystrophy: progress and challenges.

Duchenne muscular dystrophy (DMD) is one of the most common lethal, hereditary diseases of childhood. Since the identification of the genetic basis of this disorder, there has been the hope that a cure would be developed in the form of gene therapy. This has yet to be realized, but many different gene therapy approaches have seen dramatic advances in recent years. Although viral-mediated gene therapy has been at the forefront of the field, several non-viral gene therapy approaches have been applied to animal and cellular models of DMD. These include plasmid-mediated gene delivery, antisense-mediated exon skipping, and oligonucleotide-mediated gene editing. In the past several years, non-viral gene therapy has moved from the laboratory to the clinic. Advances in vector design, formulation, and delivery are likely to lead to even more rapid advances in the coming decade. Given the relative simplicity, safety, and cost-effectiveness of these methodologies, non-viral gene therapy continues to have great promise for future gene therapy approaches to the treatment of DMD.

Animals↗

Genetic and functional analysis of Raynaud's syndrome implicates loci in vasculature and immunity.

Raynaud's syndrome is a dysautonomia where exposure to cold causes vasoconstriction and hypoxia, particularly in the extremities. We performed meta-analysis in four cohorts and discovered eight loci (ADRA2A, IRX1, NOS3, ACVR2A, TMEM51, PCDH10-DT, HLA, and RAB6C) where ADRA2A, ACVR2A, NOS3, TMEM51, and IRX1 co-localized with expression quantitative trait loci (eQTLs), particularly in distal arteries. CRISPR gene editing further showed that ADRA2A and NOS3 loci modified gene expression and in situ RNAscope clarified the specificity of ADRA2A in small vessels and IRX1 around small capillaries in the skin. A functional contraction assay in the cold showed lower contraction in ADRA2A-deficient and higher contraction in ADRA2A-overexpressing smooth muscle cells. Overall, our study highlights the power of genome-wide association testing with functional follow-up as a method to understand complex diseases. The results indicate temperature-dependent adrenergic signaling through ADRA2A, effects at the microvasculature by IRX1, endothelial signaling by NOS3, and immune mechanisms by the HLA locus in Raynaud's syndrome.

Raynaud Disease↗

Widespread A-to-I RNA editing of Alu-containing mRNAs in the human transcriptome.

RNA editing by adenosine deamination generates RNA and protein diversity through the posttranscriptional modification of single nucleotides in RNA sequences. Few mammalian A-to-I edited genes have been identified despite evidence that many more should exist. Here we identify intramolecular pairs of Alu elements as a major target for editing in the human transcriptome. An experimental demonstration in 43 genes was extended by a broader computational analysis of more than 100,000 human mRNAs. We find that 1,445 human mRNAs (1.4%) are subject to RNA editing at more than 14,500 sites, and our data further suggest that the vast majority of pre-mRNAs (greater than 85%) are targeted in introns by the editing machinery. The editing levels of Alu-containing mRNAs correlate with distance and homology between inverted repeats and vary in different tissues. Alu-mediated RNA duplexes targeted by RNA editing are formed intramolecularly, whereas editing due to intermolecular base-pairing appears to be negligible. We present evidence that these editing events can lead to the posttranscriptional creation or elimination of splice signals affecting alternatively spliced Alu-derived exons. The analysis suggests that modification of repetitive elements is a predominant activity for RNA editing with significant implications for cellular gene expression.

5' Untranslated Regions↗

Development of a highly efficient protoplast regeneration and transfection protocol for enhancing CRISPR genome editing of Brassica carinata.

Brassica carinata is an important oil crop with significant potential for food and industrial production. The application of the CRISPR/Cas9 genome editing tool in B. carinata could accelerate its breeding cycle. However, no efficient DNA-free gene editing method currently exists for this species. Protoplast-based CRISPR editing presents a promising solution, though it is often challenging for many crop species. In this study, we investigated several critical factors influencing in vitro shoot regeneration, including genotype, sugar type, selection and combination of plant growth regulators (PGRs), and culture duration on different media throughout various stages of protoplast development. As a result, we developed a highly efficient, five-stage protoplast regeneration protocol for B. carinata based on specific stages of protoplast development. Key findings of this study include the requirement for high concentrations of NAA and 2,4-D in the initial medium (MI) for cell wall formation, while a lower auxin concentration relative to cytokinin was necessary for active cell division (MII). For callus growth and shoot induction, a high cytokinin-to-auxin ratio was essential (MIII), and an even higher cytokinin-to-auxin ratio was optimal for shoot regeneration (MIV). For shoot elongation, low levels of BAP and GA3 were sufficient (MV). Our results also demonstrated that the duration of culture on different media and maintaining appropriate osmotic pressure at the early stages were crucial for successful protoplast regeneration. With this optimized protocol, we achieved an average regeneration frequency of up to 64% and a transfection efficiency of 40% using the GFP marker gene. This efficient protoplast regeneration protocol is now being employed for genome editing in our lab and is expected to significantly enhance the application of the CRISPR system in both basic research and the genetic improvement of B. carinata over the long term.

Brassica carinata↗

Targeting the "bitterness gene" by genome editing abolishes synthesis of bitter flavanones in citrus; prospects for new varieties and extended climates for cultivation.

Bitterness in citrus fruit is conferred by flavanone-neohesperidosides, whose accumulation is catalyzed by a single enzyme flavanone-7-O-glucosides-1,2-rhamnosyltransferase (1,2RhaT), expressed in both leaves and fruit. To eliminate citrus bitterness, we used CRISPR/Cas9 genome editing to inactivate the 1,2RhaT gene in grapefruit (Citrus paradisi) and "Carrizo" citrange (Citrus sinensis × Citrus trifoliata). Edited lines displayed frameshift mutations that introduced premature stop codons, effectively abolishing the synthesis of the bitter neohesperidosides naringin, neohesperidin, and poncirin. Metabolomic analyses in leaves from 1,2RhaT-mutant lines confirmed the absence of bitter flavanone-neohesperidosides and a compensatory increase in the tasteless flavanone-rutinosides hesperidin, didymin, and narirutin. Since 1,2RhaT is encoded by a single gene, our findings in leaves are expected to be identical for fruit and thus demonstrate a strategy for developing non-bitter citrus cultivars while retaining health-benefitting flavonoid levels. Furthermore, cold-hardy citrus species that are currently unacceptably bitter due to high flavanone-neohesperidoside levels may become useful sources for introduction of cold-hardiness following inactivation of the 1,2RhaT gene. This approach thus paves the way for expanding grapefruit markets and breeding cold-hardy, palatable citrus varieties that are better suited to a wider range of climates.

Flavanones↗

Rewriting the script: gene therapy and genome editing for von Willebrand Disease.

In recent years gene therapy has emerged as a powerful technology for treatment of a large variety of inherited disorders. With the FDA approval of in vivo gene therapy of hemophilia A and B using AAV-mediated transgene delivery to hepatocytes, the path towards a new treatment era seemed paved. Also, CRISPR-Cas based approaches have reached the clinic, as in the ex vivo treatment of hematopoietic stem cells for sickle cell disease and thalassemia patients. The question arises whether these innovative strategies will also be suitable for patients with von Willebrand Disease (VWD). Whilst in and ex vivo delivery to endothelial cells (ECs) has been demonstrated, and CRISPR-Cas9 gene editing has been successful in ECs, there are currently no gene therapy options available for VWD. The wide variety of pathogenic VWF mutations makes development of broadly applicable, cost-effective gene therapies challenging. While delivery of von Willebrand factor (VWF) as a therapeutic transgene would be optimal, the size of VWF challenges efficient delivery. Therefore, treatment of VWD requires targeted, personalized gene therapy; for instance by using the newest CRISPR-Cas technologies which can be tailored to facilitate alteration and restoration of various pathogenic VWD variants. This review describes the inherited bleeding disorder VWD and potential gene therapy approaches for management of the disease. Thereby we are exploring different CRISPR-Cas technologies and recent developments in the field. Moreover, we will discuss the ongoing advances of in vivo delivery systems, all with the scope on ECs.

CRISPR-Cas, in vivo delivery↗

Molecular determinants and guided evolution of species-specific RNA editing.

Most RNA editing systems are mechanistically diverse, informationally restorative, and scattershot in eukaryotic lineages. In contrast, genetic recoding by adenosine-to-inosine RNA editing seems common in animals; usually, altering highly conserved or invariant coding positions in proteins. Here I report striking variation between species in the recoding of synaptotagmin I (sytI). Fruitflies, mosquitoes and butterflies possess shared and species-specific sytI editing sites, all within a single exon. Honeybees, beetles and roaches do not edit sytI. The editing machinery is usually directed to modify particular adenosines by information stored in intron-mediated RNA structures. Combining comparative genomics of 34 species with mutational analysis reveals that complex, multi-domain, pre-mRNA structures solely determine species-appropriate RNA editing. One of these is a previously unreported long-range pseudoknot. I show that small changes to intronic sequences, far removed from an editing site, can transfer the species specificity of editing between RNA substrates. Taken together, these data support a phylogeny of sytI gene editing spanning more than 250 million years of hexapod evolution. The results also provide models for the genesis of RNA editing sites through the stepwise addition of structural domains, or by short walks through sequence space from ancestral structures.

Adenosine↗

Aptazyme-directed A-to-I RNA editing.

As a promising therapeutic approach, the RNA editing process can correct pathogenic mutations and is reversible and tunable, without permanently altering the genome. RNA editing mediated by human ADAR proteins offers unique advantages, including high specificity and low immunogenicity. Compared to CRISPR-based gene editing techniques, RNA editing events are temporary, which can reduce the risk of long-term unintended side effects, making off-target edits less concerning than DNA-targeting methods. Moreover, ADAR-based RNA editing tools are less likely to elicit immune reactions because ADAR proteins are of human origin, and their small size makes them relatively easy to incorporate into gene therapy vectors, such as adeno-associated virus vectors (AAVs), which have limited space. Despite the promise of RNA editing as a therapeutic approach, precise temporal and spatial control of RNA editing is still lacking. Therefore, we have developed a small molecule-inducible RNA editing strategy by incorporating aptazymes into the guide RNA of the BoxB-λN-ADAR system. This chapter provides detailed protocols for targeted RNA editing by ADAR deaminases using aptazyme-based guide RNAs controlled by exogenous small molecules, marking the earliest use of aptazymes to regulate RNA editing strategies. Once small molecules are added or removed, aptazymes trigger self-cleavage to release the guide RNA, thus achieving small molecule-controlled RNA editing. To satisfy different RNA editing applications, we have realized the conditional activation and deactivation of A-to-I RNA editing of target mRNA using switch aptazymes. We provide step-by-step protocols for constructing guide RNA plasmids for regulatory purposes and conducting small molecule-induced RNA regulatory editing experiments in cells.

Animals↗

Loss of function of the chromatin remodeling gene INO80D leads to neurogenic features of schizophrenia.

Schizophrenia has been linked to severely damaging de novo mutations in synaptic junction proteins, neurotransmitter receptors, transcription factors, and chromatin remodeling proteins. In a patient with schizophrenia in the absence of a family history of severe mental illness, we identified de novo nonsense mutation, INO80D p.Q568X, associated with both a truncated protein and partial nonsense-mediated decay. Three experiments were undertaken to evaluate the consequences of the mutation. 1) In neural stem cells (iNSCs) differentiated from WTC11 iPSCs, CRISPRi knockdown of INO80D led to downregulation of three subunits of the AMPA-glutamate receptor, of multiple genes mutant in schizophrenia, and of genes of synaptic function. 2) INO80D p.Q568X iNSCs and neurons differentiated from patient-derived induced pluripotent stem cells (iPSCs) had significantly lower expression of neurogenesis genes compared to patient-derived cells with the mutation corrected by CRISPR-Cas9 gene editing. Patient-derived INO80D p.Q568X neurons had significantly higher expression of cell division genes compared to lines with the mutation corrected, consistent with the possibility that some of these cells may be undergoing mitosis, which is not normal for neurons. 3) Finally, on microelectrode array (MEA) plates, WTC11-derived glutamatergic neurons with reduced expression of INO80D had more rapid firing rate and increased average network burst duration, both features of neurons derived from patients with neurodevelopmental disorders. Overall, these findings suggest that partial loss of INO80D function due to de novo mutation may have disrupted normal neurodevelopment and contributed to the schizophrenia of this patient.

Humans↗

Chromatin accessibility analysis reveals functional cis-regulatory regions related to fruit development and domestication in tomato.

Non-coding DNA sequences harbor vast regulatory programs that ensure the precise spatiotemporal control of gene expression, which is essential for proper plant development and trait formation. Chromatin accessibility analysis could identify functional DNA regions within the extensive non-coding sequences and infer regulatory elements, serving as a crucial approach to unravel the mysteries of non-coding DNA sequences. Tomato fruit, a fleshy organ, provides a special system for studying fruit development and trait formation. However, the role of cis-accessible chromatin regions (cis-ACRs) during tomato fruit development, particularly in comparison with protein-coding DNA sequences, remains poorly understood. Here, we used ATAC-seq to define the landscape of cis-ACRs during fruit development and domestication in tomato. Temporal differential analysis revealed the dynamic opening and closing of cis-ACRs during fruit development. Comparative analysis of cis-ACRs between cultivated and wild tomatoes highlighted their significant contributions to fruit domestication. Combining analysis with genomic structural variations (SVs) suggested that SVs are likely a key factor in the formation of specific accessible cis-ACRs in cultivated tomatoes. Moreover, using gene editing, we identified a functional cis-ACR within the intron of the MBP3 gene that regulates fruit development and size traits. Overall, our findings provide a comprehensive perspective on the roles of cis-ACRs in tomato fruit development and domestication.

Solanum lycopersicum↗