Beyond inflammation: the residual burden as the next target in inflammatory bowel disease.
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Integrated signatures define mutational processes in prostate cancer.
Prostate cancer follows a long and heterogeneous disease course with incompletely understood aetiology1. Here we dissect the mutational processes shaping the genomes of 959 donors from the Pan Prostate Cancer Group and assess their clinical relevance. By integrating de novo extracted single-base substitution, insertion-deletion and copy-number signatures with six novel complex structural variant signatures, we identify eight integrated mutational footprints (IMFs) that collectively explain the mutational processes in 85% of primary prostate cancer genomes. IMFs were strongly influenced by regional biases in the genome, most prevalently androgen receptor-mediated mutagenesis and replication stress. Four IMFs, present in 37% of primary tumours, were significantly associated with shorter time to metastasis. These included reactive oxygen-species-driven mutagenesis and both canonical and non-canonical homologous recombination deficiency, the latter being enriched in patients of African ancestry. Extending to the metastatic setting, we found that IMFs predicted sensitivity to androgen receptor pathway inhibitors. Taken together, our study delineates the aetiologies and mutational processes that drive the genomic and clinical heterogeneity of prostate cancer, introduces IMFs as a unifying framework, and highlights their potential to improve both risk stratification and biomarker-guided treatment selection.
Journal Article↗
Denisovans from southwestern China and their subsistence strategies.
Growing fossil and genomic evidence has substantially advanced our understanding of Denisovans' evolutionary history1-9, yet their technological behaviours and subsistence strategies remain poorly documented. Here we present a comprehensive analysis of hominin fossils and associated archaeological remains from Bianfu Cave, Yunnan Province, southwestern China. The hominin fossils are dated to about 167-134 thousand years ago (ka), whereas the cultural sequence spanned from about 190 ka to 70 ka, representing one of the longest cultural records most parsimoniously attributed to Denisovans-identified through enamel-dentine junction morphology and palaeoproteomic analyses10. The new fossils include four teeth that expand the known dental variation of this group, two cranial fragments and a radius. Faunal and pollen records indicate a conifer-dominated forest or forest-steppe environment across Marine Isotope Stages 6 to 4. The inhabitants of Bianfu Cave practised specialized hunting of medium- to large-bodied prey and used a technological strategy characterized by expedient core reduction and tool production, alongside pervasive use of unmodified bones. This pattern suggests an adaptive system prioritizing the exploitation of object affordance over intensive tool manufacture. Bianfu Cave provides unprecedented insights into Denisovan biology, behaviour and ecology in eastern Asia and points to a substantial genetic and cultural legacy in later populations in Southeast Asia and Oceania.
Journal Article↗
A serpin-myeloid axis in pancreatic cancer heterogeneity and immune evasion.
Pancreatic ductal carcinoma (PDAC) is characterized by a highly immunosuppressive, extracellular matrix-rich microenvironment, yet tumours display marked heterogeneity1-4. This raises the question of whether immune resistance is a global tumour property or is organized within spatially restricted niches. Here, using Perturb-map spatial functional genomics, we determine how different genes shape the growth and cellular environments of PDAC clones across space and time. This analysis revealed early gene-driven remodelling of local immune neighbourhoods preceding late-stage spatial clonal dominance. We identify SERPINE1 (encoding plasminogen activator inhibitor 1 (PAI1)) and SERPINB2 (encoding PAI2) as dominant regulators of tumour microenvironment control and immune evasion. These serpins promote stabilization of fibrin-rich extracellular matrix niches that spatially retain and programme macrophages towards immunosuppressive states while excluding cytotoxic T cells. Loss of Serpine1 or Serpinb2, or pharmacological inhibition of PAI1 or CD18, improves tumour control in mice and synergizes with anti-PD-1. Multimodal spatial analysis of patient tumours revealed that immunosuppressive niches form around rare SERPINB2- and SERPINE1-expressing PDAC subpopulations, dominated by SPP1+/MARCO+ macrophages. These findings identify cancer-derived SERPINE1 and SERPINB2 as local spatial organizers of immune suppression, linking tumour-intrinsic heterogeneity to local microenvironmental control and immunotherapy resistance in PDAC.
Journal Article↗
Predicting genome-wide functional constraints with GPN-Star.
Genomic language models have emerged as a powerful approach for learning genome-wide functional constraints directly from DNA sequences1. However, standard genomic language models adapted from natural language processing often require large model sizes and computational resources, yet still fall short of classical evolutionary models in predictive tasks2-4. Here we introduce a genomic pretrained network with species tree and alignment representations (GPN-Star), which is a biologically grounded genomic language model featuring a phylogeny-aware architecture that leverages whole-genome alignments and species trees to model evolutionary relationships explicitly. Trained on alignments spanning vertebrate, mammal and primate evolutionary timescales, GPN-Star achieves state-of-the-art performance across a wide range of variant effect prediction tasks in both coding and non-coding regions of the human genome. Analyses across timescales show task-dependent advantages of modelling more recent versus deeper evolution. To demonstrate its potential to advance human genetics, we show that GPN-Star substantially outperforms previous methods in prioritizing pathogenic and fine-mapped genome-wide association study variants, yields strong enrichments of complex trait heritability and improves power in rare variant association testing5. Extending beyond humans, we train GPN-Star for five model organisms-Mus musculus, Gallus gallus, Drosophila melanogaster, Caenorhabditis elegans and Arabidopsis thaliana-demonstrating the robustness and generalizability of the framework. Taken together, these results position GPN-Star as a scalable, powerful and flexible tool for genome interpretation, well suited to leverage the growing abundance of comparative genomics data.
Journal Article↗
Highly efficient base editing at PCSK9 and normal human embryo development.
Cas9-based tools enable programmable DNA lesions for studying repair outcomes, gene function, and genome correction. In human embryos, Cas9-induced DNA double-strand breaks are genotoxic, causing frequent aneuploidy and large deletions1,2. Here, we evaluate DNA repair outcomes at nicks and mismatches introduced by base editors at the PCSK9 and HBG loci in human embryos. Delivering ABE8e-V106W as a protein at fertilization achieved editing at all PCSK9 alleles, supporting development to the blastocyst stage and the derivation of homozygous edited stem cell lines. No insertions or deletions were detected, although rare on-target chromosome breakage and chromosomal abnormalities occurred. Nevertheless, editing at bystander and off-target sites was mosaic, and the introduction of the editor as mRNA caused frequent embryo arrest due to guide-independent deaminase activity. Thus, unlike Cas9-induced DNA breaks, base editor-induced lesions are efficiently repaired. However, undesirable consequences for the genome and development can occur, currently precluding clinical use in reproduction.
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Pyridoxal-phosphate-dependent biosynthesis of aminovaleramide by AvaS in tRNA.
In eubacteria, decoding of isoleucine codon AUA requires a specialized tRNA (tRNAIle2) modified with lysidine (k2C) at the anticodon wobble position (C34), which switches decoding specificity from methionine (AUG) to isoleucine (AUA). Recently, aminovaleramide cytidine (ava2C) was discovered at the same tRNA position in several bacteria and plants and shown to support AUA decoding and Ile-specific aminoacylation. However, the enzyme catalyzing ava2C was unknown. Here, we report that tRNAIle-aminovaleramididine synthetase (AvaS) catalyzes ava2C biosynthesis in Pseudomonas aeruginosa PA14. AvaS converts k2C to ava2C through a pyridoxal-phosphate-dependent oxidative decarboxylation mechanism, supported by site-directed mutagenesis and in vitro enzymatic assays. Dual-reporter assays demonstrated that ava2C-modified tRNA exhibits lower AUA decoding efficiency than k2C-modified tRNA. Additionally, genome-wide screening revealed an unexpected link between ava2C levels and metabolic and stress response pathways influencing i6A/ms2i6A dynamics. Together, these findings define the molecular basis of ava2C biosynthesis and its broader cellular metabolic networks.
Journal Article↗
A sequence motif enables widespread use of noncanonical redox cofactors in natural enzymes.
Noncanonical redox cofactors (NRCs) are low-cost alternatives to the natural redox cofactors nicotinamide adenine dinucleotide (NAD+) and nicotinamide adenine dinucleotide phosphate (NADP+) for biomanufacturing, offering exquisite electron-delivery control, yet their adoption is limited by the scarcity of compatible enzymes. Screening the aldehyde dehydrogenase (ALDH) family, we identified a conserved RH/QxxR motif that enables widespread NRC activity among natural enzymes. Bos taurus ALDH3a1 exhibits unprecedented turnover with nicotinamide mononucleotide (NMN+), with kcat values exceeding NAD+ and surpassing most engineered NRC-active enzymes by 10-105-fold. Structural analyses reveal that this motif reinforces cofactor positioning and preorganizes the active site independently of the NAD+ adenosine monophosphate moiety. This motif supports activity across simple-synthetic NRCs such as 1-(2-carbamoylmethyl)nicotinamide and, when introduced into diverse ALDH scaffolds, enhances NMN+ activity up to 60-fold. These findings elucidate nature's solution to engineering NRC-active enzymes and offer a blueprint to mine latent evolutionary plasticity in natural enzymes that serve as superior engineering starting points.
Journal Article↗
A single-nucleus transcriptomic atlas of human inner ear development.
Hearing and balance rely on coordinated activity of multiple inner ear cell types, yet the mechanisms governing their development and specification in humans remain unclear. Consequently, this limits our understanding of how disease genes affect cell type formation and function, limiting the development of targeted treatments, including gene therapies. Here we present the Human Inner Ear Development snRNA-seq Atlas (HIEDRA), a single-nucleus transcriptomic atlas of the human inner ear spanning the first and second trimesters. HIEDRA maps sensory and nonsensory epithelia, neurons and mesenchyme-associated populations, including undercharacterized secretory cells required for ion homeostasis. We identify selective vulnerability in sensory and secretory lineages to disease-associated genes, infer regulatory networks and show that Hedgehog signaling suppression is required for secretory cell specification. We validate this mechanism in human inner ear organoids, expanding the model to include all major cell types. Altogether, these findings provide insights into human inner ear cell type specification, improve in vitro models and establish HIEDRA as a resource for investigating human inner ear development.
Journal Article↗
Molecular divergence and genomic composition of B chromosomes in the fish Cyphocharax modestus (Characiformes, Curimatidae).
B chromosomes are supernumerary elements that evolve from standard A chromosomes and are primarily composed of repetitive DNAs, yet their origin, diversification, and molecular composition remain poorly understood in most vertebrates. We investigated two allopatric populations of Cyphocharax modestus (Curimatidae) combining classical cytogenetics, comparative genomic hybridization (CGH), and comparative satellitomics to characterize the repetitive DNA landscape of its B chromosomes. While both populations exhibited a conserved karyotype of 2n=54 biarmed chromosomes, five individuals from the Batalha River (BR) carried supernumerary chromosomes, comprising two distinct variants: a C-positive B1 and an C-negative B2. Comparative satellitome analysis between 3B-carrying and B-lacking individuals identified 116 satellite DNAs (CmoSatDNAs), with the 3B library showing higher abundances of specific sequences. Fluorescence in situ hybridization (FISH) revealed that both B variants share two centromeric satellites (CmoSat01-192 and CmoSat02-108) with the A complement, while CmoSat58-47 was exclusively to B2. Minimum spanning tree analysis of CmoSat58-47 revealed B-exclusive haplotypes alongside haplotypes shared with B-lacking individuals, suggesting a recent origin for these chromosomes. CGH experiments further confirm the sequence sharing between the A and B chromosomes, supporting an intraspecific origin, and revealing substantial genomic differentiation among B variants.
Animals↗
Wound healing in Atlantic spiny dogfish sharks.
Field observations and limited experimental studies indicate that elasmobranchs can repair substantial skin injuries, but the temporal course and cellular composition of wound healing in Atlantic spiny dogfish remain poorly characterized. We conducted an exploratory laboratory study in 20 female Atlantic spiny dogfish (Squalus acanthias) using standardized full-thickness skin wounds monitored by serial photography for 35 days, histological analysis at defined post-injury time points, and pooled single-nucleus RNA sequencing of intact and wounded skin. A continuous neoepithelial layer covered all examined wound beds by Day 1, whereas macroscopic wound area decreased progressively over 35 days and dermal denticles remained absent from the repaired surface. Histological examination showed progressive neoepidermal maturation, basement-membrane reformation, collagen deposition, and granulation-tissue organization, indicating that epithelial coverage preceded restoration of normal skin architecture. Single-nucleus RNA sequencing identified epithelial, stromal, vascular, pigment, neural, and immune-cell populations. T and B cells were detected in intact skin, and their relative abundance, together with that of several other leukocyte populations, increased at Day 1 and generally declined by Day 14. Because samples were pooled by time point, these transcriptomic changes are descriptive. These findings characterize rapid early reepithelialization followed by slower tissue remodeling in Atlantic spiny dogfish and provide a foundation for future comparative studies of elasmobranch skin repair.
Animals↗
Resolution-dependent self-supervised transfer in chest radiograph classification.
BACKGROUND: Self-supervised learning (SSL) has improved visual representation learning, but its value in chest radiography remains uncertain. DINOv3 extends earlier SSL models through Gram-anchored self-distillation and explicit high-resolution adaptation. Whether these changes improve transfer learning for chest radiograph classification has not been established. METHODS: We benchmarked DINOv3 against DINOv2 and supervised ImageNet initialization across seven chest radiograph datasets comprising 816,183 radiographs from pediatric and adult cohorts. ViT-B/16 and ConvNeXt-B were evaluated under full fine-tuning at 224 × 224 and 512 × 512 pixels, with targeted 1024 × 1024 experiments on three cohorts. Additional analyses examined parameter-efficient adaptation, synthetic label corruption, external validation, frozen 7B features, and computational efficiency. The primary outcome was the mean area under the receiver operating characteristic curve across labels. RESULTS: In adult cohorts, DINOv3 did not consistently outperform DINOv2 at 224 × 224 pixels, but became the strongest initialization at 512 × 512 pixels, especially with ConvNeXt-B. Gains were greatest for small focal and boundary-dependent abnormalities, whereas large-structure findings changed little. The pediatric cohort showed no significant benefit from DINOv3, higher resolution, or backbone choice. Scaling to 1024 × 1024 rarely improved performance and markedly increased computational cost. ConvNeXt-B remained superior to ViT-B/16 under both full and parameter-efficient adaptation. External validation preserved the 512 × 512 DINOv3 advantage, whereas synthetic label corruption showed that this benefit should not be interpreted simply as superior noise robustness. Frozen DINOv3-7B features underperformed relative to fully adapted 86 to 89M-parameter backbones. CONCLUSIONS: For adult chest radiograph classification, DINOv3 provides its most reliable benefit at 512 × 512 pixels, particularly with ConvNeXt-B. Fully adapted mid-sized models at 512 × 512 pixels provided the best performance-cost trade-off in our benchmark.
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Short-Term Success, Long-Term Failure: Strain Turnover and Virulence Re-Emergence May Drive Relapse in Pouchitis.
BACKGROUND & AIMS: Pouchitis, de-novo small intestinal inflammation is the most common complication developing in patients with ulcerative colitis after total large bowel resection and ileal pouch-anal anastomosis (IPAA) reconstruction. While the first line treatment is antibiotics, the microbial properties underlying flare, remission, and relapse remain vague. We aimed to investigate how antibiotic treatment drives microbial shifts that underlie remission and contribute to relapse. METHODS: Patients after IPAA were prospectively recruited during clinical flare (active pouchitis defined by the pouchitis disease activity index) and received a two-week course of metronidazole with either ciprofloxacin or doxycycline. Longitudinal follow up was conducted during a year. Clinical data were recorded, and fecal samples were obtained during consequent flares, recovery, and relapses. Microbial gene repertoire, strains, and resistance to antibiotics were determined. Metagenomic sequencing was integrated with whole-genome sequencing of Escherichia coli isolates, providing strain-specific virulence and antibiotic resistance profiles. RESULTS: Patients (n=21) recruited provided 130 samples over one-year follow-up. Both antibiotic regimens induced rapid but transient clinical improvement, reflected by a decrease in fecal calprotectin (728 to 265 μg/g, p<.05), and a marked reduction in bacterial exotoxin genes (p<.05), yet both parameters rebounded by 6 weeks post-treatment. Antibiotic resistance gene abundance significantly increased during treatment (p<.05), without expansion of resistance gene diversity, indicating that pre-existing resistant strains increased. CONCLUSIONS: Antibiotic-induced remission in pouchitis likely results from a temporary suppression of exotoxin-producing bacteria, enabling resistant, low-virulence strains to transiently dominate; The fact that harmful strains quickly rebound after treatment cessation highlights the need for targeted approaches to achieve sustained microbial control.
Inflammatory bowel disease↗
A Phase 3 Trial of Vosoritide in Children with Hypochondroplasia.
BACKGROUND: Hypochondroplasia, a fibroblast growth factor receptor 3 (FGFR3)-related skeletal condition characterized by disproportionate short stature and a spectrum of clinical features, has no available targeted therapies. Vosoritide, a C-type natriuretic peptide analogue approved for the treatment of achondroplasia, is being investigated for hypochondroplasia. METHODS: In this phase 3, multicenter trial, children with hypochondroplasia who were 3 to less than 18 years of age were randomly assigned to receive once-daily subcutaneous injections of vosoritide or placebo for 52 weeks per weight-band dosing regimen. The primary end point was change from baseline in annualized growth velocity at week 52 versus placebo. Confirmatory statistical testing using hierarchical procedures to control for type I error at the one-sided 0.025 significance level (equivalent to the two-sided 0.05 level) was performed for the primary and six key secondary efficacy end points. The safety and side effect profile of vosoritide versus placebo was assessed. RESULTS: A total of 81 participants were randomly assigned to receive vosoritide (n=41) or placebo (n=40). At week 52, the least squares mean (LSM) change from baseline in annualized growth velocity was 1.95 cm/year with vosoritide versus -0.39 cm/year with placebo (LSM difference of 2.33 cm/year; 95% confidence interval, 1.85-2.82 cm/year; two-sided P<0.0001). Most participants in the vosoritide group (87.8%) and the placebo group (72.5%) experienced at least one adverse event (AE). There were no reports of grade 3 or higher AEs, AEs leading to treatment discontinuation, or deaths. CONCLUSIONS: One year of vosoritide treatment significantly increased linear growth in children with hypochondroplasia. (Funded by BioMarin Pharmaceutical; ClinicalTrials.gov number, NCT06455059.).
Journal Article↗
Mechanotransduction in musculoskeletal mesenchymal tissues: implications for bone, tendon, and cartilage regenerative engineering-a narrative review.
PURPOSE/AIM OF THE STUDY: To integrate evidence on how mechanical signals regulate musculoskeletal connective-tissue biology and how cellular context and loading history shape mechanotransduction and mechanical memory. MATERIALS AND METHODS: This narrative review synthesized PubMed-indexed evidence on extracellular matrix mechanics, adhesion complexes, the cytoskeleton, nucleus, primary cilia, mechanosensitive ion channels, cell state, and loading history in bone, tendon, ligament, and cartilage. RESULTS: Mechanotransduction is best understood as a coupled extracellular matrix-integrin-cytoskeleton-nucleus continuum rather than as independent cytoskeletal or nuclear drivers. Responses are conditioned by lineage stage, anatomic niche, inflammation, cellular subpopulation, and prior mechanical exposure. Mechanical memory may be encoded through persistent YAP/TAZ activity, microRNA programs, DNA methylation, histone modifications, chromatin architecture, and metabolic remodeling. Evidence is strongest for bone, including Piezo-dependent osteogenesis, TRPV4-mediated shear sensing, viscoelastic compression, osteocyte-stromal extracellular-vesicle signaling, and osteogenesis-angiogenesis coupling. Tendon and ligament require anisotropic architecture and strain-window control, whereas cartilage shows a narrow distinction between physiologic TRPV4-associated anabolism and high-strain or inflammation-sensitized Piezo/YAP-mediated maladaptation. CONCLUSIONS: Translational implications include mechanically defined cell expansion, biomaterial preconditioning, stage-specific rehabilitation, and potency assays incorporating loading history. Direct clinical validation of stable perioperative cellular mechanical memory remains limited. Future studies should combine controlled mechanical perturbation with bulk and single-cell RNA sequencing, chromatin-accessibility profiling, spatial methods, and perturbational genomics.
Mechanotransduction↗
Identification of rare maternal copy number variants by genome-wide analysis of noninvasive prenatal screening data in 113,017 pregnant women.
OBJECTIVES: Knowledge of copy number variants (CNVs) is relevant to maternal and fetal health and can be obtained from noninvasive prenatal screening (NIPS) of pregnancy. However, genome-wide analysis of maternal CNVs using NIPS data has not been conducted in large populations. METHODS: For CNV analysis, the human genome was segmented into 10 kilobase pairs (Kb) bins, and the relative sequencing depth of each bin was calculated. The circular binary segmentation algorithm was used to estimate CNVs. Detected CNVs from two pregnancies of the same participant were compared to validate the reproducibility. All CNVs were merged into CNV regions (CNVRs) to evaluate their frequency, distributions, and relationship with disease-related genes and regions. RESULTS: In this study, 113,017 pregnant women were recruited. A total of 363,886 CNVs larger than 50 Kb were detected in 101,779 individuals and merged into 43,005 CNVRs. For evaluating the reproducibility of CNVs, 90.18% of deletions and 88.07% of duplications were consistent. In general, 78.13% of individuals carried CNVRs that overlapped protein-coding genes, while 14.76% overlapped OMIM genes. We detected 246 novel CNVRs, 134 (54.47%) involving protein-coding genes. For the perspective of maternal-fetal health, we identified 4,984 (4.41%) individuals as carriers of 5,243 CNVs containing known pathogenic or likely pathogenic regions, including 22q11.2 region and DMD gene.. CONCLUSIONS: NIPS sequencing data is a reliable source for maternal CNV detection. These CNVs constitute an integrate component in maternal-fetal health management.
Humans↗
Endothelial function in relation to low-level chronic residential air pollution in a general population: a cohort study.
BACKGROUND: Given the recently updated clean-air targets, this population study assessed endothelial function at low exposure to particulate matter with an aerodynamic diameter of ≤10 µm (PM10) and ≤2.5 µm (PM2.5), nitrogen dioxide (NO2) and black carbon (BC). METHODS: In 453 Flemish participants (47.7% women; mean age, 52.8 years), endothelial function was assessed by finger photoplethysmography after 5 min of ischaemia. The outcome measures were the maximal ischaemic-to-control ratio (Rmax) and the maximal difference (Dmax) in pulse amplitude between the test and control fingers. The air pollutants were related to Rmax and Dmax using mixed models accounting for coresidence, to cardiovascular endpoints by proportional hazards regression, and to residential address by high-resolution spatiotemporal interpolation. RESULTS: From 2010 to 2015, PM10, PM2.5, NO2 and BC decreased (p < 0.0001) with 6-year levels averaging 15.9, 12.8, 14.3 and 1.04 µg/m3. Irrespective of adjustment for risk factors, Dmax was inversely correlated with PM2.5, while associations of Rmax with PM2.5 and associations of both Dmax and Rmax with other pollutants were weaker (p values <0.10), but consistently inverse. Association sizes of Rmax and Dmax with PM10 and PM2.5 weakened over 6 years, paralleling the decreasing air pollutants (p ≤ 0.044). In adjusted analyses, the risk of a composite cardiovascular endpoint decreased (p ≤ 0.043) with higher Rmax and Dmax with hazard ratios ranging from 0.31 to 0.49. Finally, in the geographical analysis, endothelial dysfunction followed the spatial gradients in PM2.5. CONCLUSIONS: Long-term low-level air pollution is associated with subclinical endothelial dysfunction, the initial and critical step leading to adverse cardiovascular outcomes.
Humans↗
Detection of dsRNA in Soil-Derived Ascomycetes and Characterization of Cladosporium cladosporioides Partitivirus 1 Isolate IPBL11.
Mycoviruses can induce phenotypic and physiological changes in their fungal hosts, making them valuable biological resources. To harness this potential, it is crucial to gather comprehensive information on their distribution patterns, genomic and structural characteristics, and interactions with host fungi. In this study, we screened 64 ascomycete isolates collected from various soil environments in Korea to detect the presence of double-stranded RNA (dsRNA) elements. We identified dsRNA bands in three of these isolates. Among them, we determined the complete genome sequence of a bipartite dsRNA virus found in Cladosporium anthropophilum. Phylogenetic analyses based on the RNA-dependent RNA polymerase (RdRP) and capsid protein (CP) sequences indicated that this virus belongs to the genus Gammapartitivirus within the family Partitiviridae. Comparative sequence analyses suggested that this virus is best classified as a new isolate of Cladosporium cladosporioides partitivirus 1, which we designated as Cladosporium cladosporioides partitivirus 1 isolate IPBL11 (CcPV1-IPBL11).
Cladosporium anthropophilum↗