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Molecular evidence of Brucella abortus circulating in cattle, goats, and humans in Central Equatoria State, South Sudan
(Nature Research, 2025-04) Lita, Emmanuel P.; Mkupasi, Ernatus M.; Ochi, Erneo B.; Misinzo, Gerald; Van Heerden, Henriette; Katani, Robab; Godfroid, Jacques; Mathew, Coletha
Brucellosis is a neglected zoonotic disease in most developing countries, including South Sudan. Precise identification of Brucella species is crucial for addressing public health and epidemiological concerns associated with brucellosis. The study aimed to identify Brucella species using real-time polymerase chain reaction (qPCR) from seropositive samples that were acquired from an earlier investigation. A total of 143 genomic DNA samples were extracted from brucellosis Rose Bengal plate test (RBPT) seropositive samples from humans (n = 7), cattle (n = 103) and goats (n = 33). The samples were collected from Terekeka and Juba counties, Central Equatoria State (CES), South Sudan. The qPCR targeting the Brucella-specific IS711 insertion gene at the genus level was performed. Samples with a cycle threshold (Ct) of ≤ 35 were considered positive and subjected to further Brucella speciation assays. Out of 143 DNA samples tested for genus-specific Brucella, 15 (10.5%) were positive including 4 (2.8%) from humans, 10 (6.9%) from cattle, and 1 (0.7%) from goats. Brucella abortus was identified in 5 (33.3%) of the positive samples at the genus level. The overall individual species infection rates with B. abortus were 6.6% (1/15) in humans, 20% (3/15) in cattle, and 6.6% (1/15) in goats. There was no B. melitensis detected in this study. This study identified B. abortus in cattle, goats and humans in CES, South Sudan. The findings suggest that cattle are probably the primary reservoirs for transmission of B. abortus, with infections occurring in goats and humans primarily resulting from cattle spillover.
Integrated profiling of adiponectin and cytokine signaling pathways in high-fat diet-induced MASLD reveals early markers of disease progression
(Nature Research, 2025-06) Johnson, Rabia; Shabalala, Samukelisiwe; Mabasa, Lawrence; Kotze-Hoerstmann, Liske; Sangweni, Nonhlakanipho; Ramharack, Pritika; Sharma, Jyoti; Pheiffer, Carmen; Arowolo, Afolake; Sadie-Van Gijsen, Hanel
Metabolic dysfunction-associated steatotic liver disease (MASLD), which affects a significant portion of the global population, is linked to high-fat diets (HFD) and characterized by abnormal lipid accumulation and activation of inflammatory pathways in hepatocytes. The precise mechanisms underlying MASLD, especially the involvement of inflammatory cytokines in its pathophysiology, remain unclear. This study evaluated the changes and interactions of steatotic liver and inflammatory markers in an animal model of MASLD by feeding male Wistar rats a high-fat diet (HFD) for 17 weeks. After this period, the serum lipid profiles were assessed, along with liver enzymes, including aspartate aminotransferase (AST) and alanine aminotransferase (ALT). The changes in liver morphology and triglyceride levels were determined by histology and a colorimetric assay, respectively. Steatotic liver and inflammatory markers were measured using a RT2 ProfilerTMPCRArray and validated with quantitative real-time PCR (qRT-PCR). Histological evaluations indicated that HFD livers exhibited macrovesicular steatosis and lobular inflammation. The HFD-fed group had significantly higher hepatic triglyceride levels than the controls (383 ± 23 mg/dL vs. 100 ± 9 mg/dL) and elevated serum lipid levels (p < 0.0001), along with increased liver aminotransferase levels. Gene expression analysis showed decreased adiponectin signaling (AdipoR2, p < 0.001) and upregulated de novo lipogenesis (Srebf1, p < 0.05). Notably, pro-inflammatory cytokines (Cxcl10, Ccl2, Ilβ, p < 0.001; TNF-α, p < 0.01) were significantly elevated, correlating with reduced hepatic glucose transporter Glut2 expression (p < 0.05), as confirmed by STRING analysis. These findings demonstrate that HFD consumption alters key genes and pathways involved in adiponectin and insulin signalling, lipogenesis, and inflammatory responses, thereby contributing to the pathogenesis of MASLD. Additionally, it identifies a comprehensive chemokine expression profile, highlighting potential therapeutic targets for MASLD.
Insights into the effects of geographical sourcing area on nutrient composition and sensory attributes of nine edible insects
(Nature Research, 2025-05) Ishara, Jackson; Matendo, Rehema; Ng'ang'a, Jeremiah; Niassy, Saliou; Katcho, Karume; Kinyuru, John
With the rapidly growing world population, climate change uncertainties and depletion of our natural resources, edible insects are seen as sustainable and viable bioresources for food and feed to tackle global food and nutritional security issues, for their nutritional value, taste, and environmental sustainability. In this study, we investigated the effect of geographical distribution on the nutrient composition and sensory attributes of commonly consumed edible insects, namely Acheta domesticus, Apis mellifera, Gnathocera trivittata, Gryllotalpa africana, Imbrasia oyemensis, Locusta migratoria, Macrotermes subhylanus, Nomadacris septemfasciata, and Rhyncophorus phoenicis collected from six different geographical areas namely Fizi, Kabare, Kalehe, Idjwi, Mwenge and Walungu, in the Eastern D. R. Congo. Depending on edible insect species, geographical sourcing area affected significantly macronutrient composition and mineral profile as well as sensory attributes of investigated commonly edible insects. A principal component analysis (PCA-Biplot) indicated that the two axes accounted for up to 97.7% of the observed variability in the nutrient composition and sensory attributes of commonly consumed edible insects sourced from different geographical area. Visualized results after cluster analysis using non-metric multidimensional scaling (NMDS) indicated that the geographical sourcing area has substantial and significant effect on the nutrient composition as well as sensory attributes of the studied commonly edible with a stress value of 0.185.
Genomic relatedness of colonizing and invasive disease Klebsiella pneumoniae isolates in South African infants
(Nature Research, 2025-03) Olwagen, Courtney P.; Izu, Alane; Khan, Shama; Van der Merwe, Lara; Dean, Nicholas J.; Mabena, Fikile C.; Jones, Stephanie; Kwatra, Gaurav; Andrew, Lubomira; Rajyaguru, Urvi; Donald, Robert G.K.; Simon, Raphael; Said, Mohamed; Nakwa, Firdose L.; Wadula, Jeannette; Strehlau, Renate; Van Niekerk, Anika M.; Naidoo, Niree; Ramsamy, Yogandree; Velaphi, Sithembiso C.; Dangor, Ziyaad; Madhi, Shabir A.
Klebsiella pneumoniae (KPn) colonizes multiple anatomical sites and is a leading cause of invasive disease and death in African children; however, there is no comparative genomic analysis between colonizing and invasive strains. This study investigated the genomic relatedness of KPn colonizing and invasive isolates in South African infants; and evaluated the relative invasiveness of KPn isolates based on sequence types (ST), capsular (KL), and lipopolysaccharide (O) loci by calculating case-carrier ratios (CCRs). There was less genomic diversity amongst invasive (22 ST, 17 K-loci) than colonizing isolates (31 ST, 29 K-loci), with invasive isolates being 8.59-fold and 3.49-fold more likely to harbour genes encoding for multi-drug resistance and yersiniabactin production compared with colonizing isolates. The CCRs for KL102 and O1/O2v2 were > 1, and < 1 for KL8, ST1414, and O1O2v1. Identifying high-risk strains, including KL102 and O1O2v2, that may have a higher potential to cause invasive disease, could enhance risk assessment and management strategies in vulnerable populations.
Multinational cross-sectional study and meta-analysis on radicular grooves, C-shaped canals, and taurodontism in mandibular first premolars across 20 countries
(Nature Research, 2025-05) Pertek Hatipoglu, Fatma; Magat, Gueldane; Karobari, Mohmed Isaqali; Buchanan, Glynn Dale; Kopbayeva, Maira; Taha, Nessrin; Fernandez-Grisales, Rafael; Bekjanova, Olga; Luu, Peter; Buerklein, Sebastian; Mufadhal, Abdulbaset; Petridis, Xenos; Mora, Maria Fernanda; Sugumaran, Surendar; Allawi, Safaa; Ivica, Anja; Lim, Wen Yi; Fadag, Abdulrahman; Jagtap, Rohan; Kulczyk, Tomasz; Alfirjani, Suha; Palma, Paulo J.; Hatipoglu, Oemer
The success of root canal therapy is fully predicated upon a complete understanding of root and canal morphology and all the anatomical variations that can complicate the endodontic treatment. Of these morphological variations, taurodontism, RGs, and C-shaped canals are of note due to their implications on diagnosis, treatment planning, and endodontic success. This study aimed to investigate the prevalence and regional variations of C-shaped canals, RGs, and taurodontism across 20 countries using CBCT imaging and meta-analytic methods. A multicenter, cross-sectional study analyzed CBCT datasets from 6,000 participants (12,000 teeth) distributed equally across 20 countries. Standardized evaluation arrangements were utilized to identify RGs (RG), taurodontism, and C-shaped canals with their prevalence stratified by region, gender, and age. Statistical analyses cover subgroup comparisons, correlation studies, and sensitivity analysis using Cramer’s V. RGs had a pooled global prevalence of 20%, with high-rised rates in Africa. C-shaped canals reported a 10% global prevalence, mainly in Asia, On the Other hand taurodontism was lowest prevalent at 7%, with markable regional variability. Prominent bilateral symmetry was noticed for all features, and taurodontism showed the highest rate (98.33%). Important correlations existed among C-shaped canals, grooves, and taurodontism showing shared developmental pathways. The current study points out the significant prevalence, including anatomical variations of RGs, taurodontism, and C-shaped canals in mandibular 1st premolars, with substantial demographic and regional differences. The findings highlight the importance of perception of these features’ morphological interrelationships along with bilateral symmetry to increase diagnostic accuracy, clinical outcomes, and treatment planning.