A complementary metaproteomic approach to interrogate microbiome cultivated from clinical colon biopsies.

The human gut microbiome plays a vital role in preserving individual health and is intricately involved in essential functions. Imbalances or dysbiosis within the microbiome can significantly impact human health and are associated with many diseases. Several metaproteomics platforms are currently available to study microbial proteins within complex microbial communities. In this study, we attempted to develop an integrated pipeline to provide deeper insights into both the taxonomic and functional aspects of the cultivated human gut microbiomes derived from clinical colon biopsies. We combined a rapid peptide search by MSFragger against the Unified Human Gastrointestinal Protein database and the taxonomic and functional analyses with Unipept Desktop and MetaLab-MAG. Across seven samples, we identified and matched nearly 36,000 unique peptides to approximately 300 species and 11 phyla. Unipept Desktop provided gene ontology, InterPro entries, and enzyme commission number annotations, facilitating the identification of relevant metabolic pathways. MetaLab-MAG contributed functional annotations through Clusters of Orthologous Genes and Non-supervised Orthologous Groups categories. These results unveiled functional similarities and differences among the samples. This integrated pipeline holds the potential to provide deeper insights into the taxonomy and functions of the human gut microbiome for interrogating the intricate connections between microbiome balance and diseases.

MIR159 regulates multiple aspects of stamen and carpel development and requires dissection and delimitation of differential downstream regulatory network for manipulating fertility traits.

Unravelling genetic networks regulating developmental programs are key to devising and implementing genomics assisted trait modification strategies. It is crucial to understand the role of small RNAs, and the basis of their ability to modify traits. MIR159 has been previously reported to cause defects in anther development in Arabidopsis; however, the complete spectrum and basis of the defects remained unclear. The present study was therefore undertaken to comprehensively investigate the role of miR159 from Brassica juncea in modulating vegetative and reproductive traits. Owing to the polyploid nature of Brassica, paralogous and homeologous copies of MIR159A, MIR159B, and, MIR159C were identified and analysis of the precursor uncovered extensive structural and sequence variation. The MIR159 locus with mature miR159 with perfect target complimentarily with MYB65, was cloned from Brassica juncea var. Varuna for functional characterization by generating constitutively over-expressing lines in Arabidopsis thaliana Col-0. Apart from statistically significant difference in multiple vegetative traits, drastic differences were observed in stamen and pistil. Over-expression of miR159a led to shortening of filament length and loss of tetradynamous condition. Anthers were apiculate, with improper lobe formation, and unsynchronized cellular growth between connective tissue and another lobe development. Analysis revealed arrested meiosis/cytokinesis in microspores, and altered lignin deposition pattern in endothecial walls thus affecting anther dehiscence. In the gynoecium, flaccid, dry stigmatic papillae, and large embryo sac in the female gametophyte was observed. Over-expression of miR159a thus severely affected pollination and seed-set. Analysis of the transcriptome data revealed components of regulatory networks of anther and carpel developmental pathway, and lignin metabolism that are affected. Expression analysis allowed us to position the miR159a-MYB65 module in the genetic network of stamen development, involved in pollen-grain maturation; in GA-mediated regulation of stamen development, and in lignin metabolism. The study, on one hand indicates role of miR159a-MYB65 in regulating multiple aspects of reproductive organ development that can be manipulated for trait modification, but also raises several unaddressed questions such as relationship between miR159a and male-meiosis, miR159a and filament elongation for future investigations. Accession numbers: KC204951-KC204960. Project number PRJNA1035268. Supplementary Information: The online version contains supplementary material available at 10.1007/s12298-023-01377-7.

In Vitro and In Vivo Activity of Gepotidacin against Drug-Resistant Mycobacterial Infections.

Mycobacterial pathogens, including nontuberculous mycobacteria (NTM) and Mycobacterium tuberculosis, are pathogens of significant worldwide interest owing to their inherent drug resistance to a wide variety of FDA-approved drugs as well as causing a broad range of serious infections. Identifying new antibiotics active against mycobacterial pathogens is an urgent unmet need, especially those antibiotics that can bypass existing resistance mechanisms. In this study, we demonstrate that gepotidacin, a first-in-class triazaacenapthylene topoisomerase inhibitor, demonstrates potent activity against M. tuberculosis and M. fortuitum, as well as against other clinically relevant NTM species, including fluoroquinolone-resistant M. abscessus. Furthermore, gepotidacin exhibits concentration-dependent bactericidal activity against various mycobacterial pathogens, synergizes with several drugs utilized for their treatment, and reduces bacterial load in macrophages in intracellular killing assays comparably to amikacin. Additionally, M. fortuitum ATCC 6841 was unable to generate resistance to gepotidacin in vitro. When tested in a murine neutropenic M. fortuitum infection model, gepotidacin caused a significant reduction in bacterial load in various organs at a 10-fold lower concentration than amikacin. Taken together, these findings show that gepotidacin possesses a potentially new mechanism of action that enables it to escape existing resistance mechanisms. Thus, it can be projected as a potent novel lead for the treatment of mycobacterial infections, particularly for NTM, where present therapeutic interventions are extremely limited.

Incidence of Hepatocellular Carcinoma in Primary Biliary Cholangitis: A Systematic Review and Meta-Analysis.

BACKGROUND: The risk and determinants of HCC in patients with primary biliary cholangitis (PBC) are unclear. We conducted a systematic review and meta-analysis of the incidence of HCC and risk factors associated with HCC risk among patients with PBC. METHODS: We searched PubMed, EMBASE, MEDLINE, Cochrane databases and reference lists from relevant articles to identify cohort studies that examined incidence of HCC in patients with PBC from inception through November 2019. RESULTS: A total of 29 studies including 22,615 patients met the eligibility criteria. The median cohort size was 292 patients followed for an average of 76 months. The pooled incidence rate for patients with PBC was 4.17 per 1000 patient-years (95% CI 3.17-5.47). On subgroup analysis, the incidence of HCC in patients with PBC cirrhosis was 15.7 per 1000 patient-years (95% CI 8.73-28.24). The HCC incidence rate was 9.82 per 1000 person-years (95% CI 5.92-16.28) in men and 3.82 per 1000 person-years (95% CI 2.85-5.11) in women. CONCLUSIONS: Cirrhosis is the strongest risk factor for HCC in patients with PBC. Male gender was also a risk factor. Our meta-analysis supports current recommendations of HCC surveillance in patients with PBC cirrhosis. Further studies are needed to evaluate risk factors in this population.

Progeria: A Rare Genetic Syndrome.

An uncommon deadly genetic situation symbolized by the presence of rapid maturation in infants is called as the Hutchinson-Gilford Progeria Syndrome. The term basically is meant as 'prematurely old' taken from the Greek meanings. The selective cause behind this syndrome is usually a mutation in a gene called LMNA. The product of this LMNA gene which is a protein i.e. Lamin-A is considered to be responsible for anatomical framing which clasps the nuclei of the cell, well organized and together. But, the recent investigations prove a deformity in the protein i.e. Lamin-A that leads to the non-stability of the nuclei an thus gives rise to the deadly situation of untimely ageing in the children popularly known as Progeria. The literature review investigation provided pivotal information about the therapeutic researches related to the syndrome, the mutational causes and the basic information including the major and minor symptoms generally shown by the patients affected with Hutchinson-Gilford Progeria Syndrome. Investigations on this rare, uncommon disease i.e. Progeria had begun a couple of years back and in some of the researches many important aspects about the causes and possible curative drugs related to the disease which can help the patients in leading a normal life with lesser side effects and symptoms have also been discussed. Further studies will more clearly clarify the possible curative agents and unrevealed mechanisms of the disease which will help the scientists to develop measures which can provide more beneficial and healthy life to the patients with lesser complications.

Caregiver Burden in Adults With Inflammatory Bowel Disease.

Inflammatory bowel disease (IBD) is a chronic condition that has a relapsing and remitting disease course. There is high degree of inpatient and outpatient health care utilization by IBD patients along with a great deal of psychosocial stress associated with the condition. Patients frequently rely on family, friends, and other informal caregivers to provide medical, instrumental, and emotional support. The role of caregiving for adult IBD patients can lead to significant caregiver burden. At present, there are limited data on the existence of caregiver burden in adult IBD patients. Moreover, there are no specific measures for evaluating caregiver burden and there are no interventions targeting caregiver burden in adults with IBD. This review outlines the limited available data on caregiver burden in IBD, explores caregiver burden in other chronic conditions, and proposes applications of these data for creating screening and assessment tools and interventions for caregiver burden in IBD.

Factors That Contribute to Indeterminate Results From the QuantiFERON-TB Gold In-Tube Test in Patients With Inflammatory Bowel Disease.

BACKGROUND & AIMS: The QuantiFERON-Tuberculosis Gold In-Tube (QFT-GIT) (QIAGEN Group, Hilden, Germany) test is widely used to screen for latent Mycobacterium tuberculosis infection in patients with inflammatory bowel diseases (IBD) before treatment with a tumor necrosis factor antagonist. The test frequently produces indeterminate results, prompting additional testing. We evaluated factors associated with indeterminate results from the QFT-GIT test among patients with IBD. METHODS: We conducted a case-control study among eligible adults with QFT-GIT test results and a concomitant diagnosis of IBD receiving care at a tertiary referral center from 2011 through 2013. We compared patients with IBD with indeterminate and determinate (positive or negative) results from the QFT-GIT test. We collected data on patient demographics, clinical features, laboratory parameters, and medication use from medical charts. We calculated odds ratios (OR) and 95% CIs using multivariate logistic regression models. RESULTS: A total of 400 patients with IBD (265 Crohn's disease and 135 ulcerative colitis) were included in the final analyses. Indeterminate results were noted in 11.5% of patients. At the time of testing, a higher proportion of patients with indeterminate results from the QFT-GIT test were on systemic corticosteroid therapy (60.9% vs 30.5% of patients with conclusive test results; P < .001), had levels of C-reactive protein above 0.8 mg (62.2% vs 39.9% of patients with clear test results; P = .005), had an erythrocyte sedimentation rate above 15 mm/h (55.6% vs 35.8% of patients with clear test results; P = .01), had serum levels of albumin below 3.5 g/dL (33.3% vs 6.3% of patients with clear test results; P < .001), and had low levels of hemoglobin (52.2% vs 28.3% of patients with clear test results; P = .001). In multivariable analysis, corticosteroid use (adjusted OR, 2.92; 95% CI, 1.44-5.88; P = .003) and serum levels of albumin below 3.5 g/dL (adjusted OR, 3.62; 95% CI, 1.36-9.60; P = .009) were independently associated with increased risk of indeterminate QFT-GIT test results. We did not identify a dose-related effect with corticosteroid therapy and the odds of indeterminate QFT-GIT test results. CONCLUSIONS: In a case-control study of patients with IBD, we associated systemic corticosteroid therapy and low levels of albumin with an increased likelihood of having indeterminate QFT-GIT test result.

Tailoring shape and size of biogenic silver nanoparticles to enhance antimicrobial efficacy against MDR bacteria.

Spherical, rectangular, penta, and hexagonal silver nanoparticles of different dimensions were biosynthesized in an eco-friendly manner by biocontrol agent, Trichoderma viride by manipulating physical parameters, pH, temperature, and reaction time. The particles were characterized by UV-vis spectroscopy; Dynamic Light Scattering (DLS), Transmission Electron Microscopy (TEM) and Fourier Transform Infra-red Spectroscopy (FTIR). Shape and size dependent antimicrobial activity of nanoparticles against human pathogens was observed. Maximum inhibition was found with spherical nanoparticles (2-5 nm) showing 40, 51, 43, 53.9 and 55.8% against Shigella sonnei, Escherichia coli, Serratia marcescens, Staphylococcus. aureus and Pseudomonas aeruginosa respectively, where as pentagonal and hexagonal nanoparticles (50-100 nm) demonstrated 32, 41, 31, 42.84 and 42.80% of inhibition as compared to control. Nanoparticles of different geometry and dimension established enhanced antagonistic activity against pathogens with all the tested antibiotics. Excellent antimicrobial efficacy was obtained with spherical nanoparticles of 2-5 nm with ampicillin and penicillin. Shape and size played major role in enhancing antimicrobial potential of silver nanoparticles, both singly and synergistically with antibiotics which can be exploited to combat the spread of multidrug resistant pathogens.

Role of Non-hepatic Medical Comorbidity and Functional Limitations in Predicting Mortality in Patients with HCV.

BACKGROUND: Medical comorbidities and functional status limitations are determinants of mortality in many chronic diseases. The extent to which survival in the rapidly aging cohort of patients with HCV is affected by these competing causes of mortality remains unclear. AIM: We sought to determine the effect of medical/functional comorbidities on survival after adjusting for liver disease severity in a cohort of patients with HCV infection. METHODS: We prospectively recruited consecutive patients from an HCV clinic 2009-2014. We calculated an index of survival (Schonberg Index, SI) based on age, gender, medical comorbidities, and functional status variables. We defined cirrhosis with the FibroSure test (F3/4-F4). We used multivariable Cox modeling to assess association between functional/survival measure and survival after adjustment for severity of liver disease. RESULTS: The cohort consisted of 1052 HCV patients. The average age was 56.8 years; 36 % had cirrhosis. The mean SI was 8.2 (SD = 2.7). During a mean follow-up of 5610 person-years, 102 (9.7 %) patients died. In unadjusted analysis, higher baseline SI predicted mortality (HR 1.17; 95 % CI 1.09-1.25). SI similarly predicted mortality in cirrhotic patients (HR 1.23, 95 % CI 1.13-1.34) and non-cirrhotic patients (HR 1.21, 95 % CI 1.08-1.36). This did not change after adjusting for age, drug use, or coronary artery disease. DISCUSSION: Comorbidities and functional limitations predict higher mortality in patients with HCV; this relationship is independent of cirrhosis. Use of general prognostic indices may help identify HCV patients at high risk for mortality, which could further guide clinical care in a manner not achievable with assessment of liver disease alone.

Risk and Predictors of Variceal Bleeding in Cirrhosis Patients Receiving Primary Prophylaxis With Non-Selective Beta-Blockers.

OBJECTIVES: Prior studies have demonstrated the efficacy of non-selective beta-blockers (NSBB) in preventing first variceal bleeding in patients with cirrhosis. However, little is known about the overall effectiveness of NSBB in routine clinical care. METHODS: We conducted a retrospective cohort study of cirrhotic patients without prior bleeding who initiated a NSBB (propranolol, nadolol) at any Veterans Administration facility between 2008 and 2013. The primary outcome was variceal bleeding within 12 months. We conducted Cox-proportional hazards analyses to identify demographic, clinical, and NSBB-related (type of NSBB, mean dose, dose change, and heart rate response) factors associated with variceal bleeding. RESULTS: Of 5,775 patients, 678 (11.7%) developed variceal bleeding. Mean daily dose of NSBB was <40 mg in 58.8%, 18.1% had either upward or downward titration in NSBB dose, and 9.8% had hemodynamic response. Patients who were younger, with ascites, greater medical comorbidity, and higher MELD (Model for end-stage liver disease) scores had a higher risk of variceal bleeding. Patients on a higher daily dose (>60 vs. <40 mg, adjusted hazard ratio (HR) 0.64; 95% confidence interval (CI): 0.51-0.81), who had either upward or downward dose titration (adjusted HR 0.69; 95% CI: 0.52-0.90 and 0.64; 95% CI 0.45-0.90, respectively), and those who achieved hemodynamic response (adjusted HR 0.75; 95% CI=0.57-1.0) had lower risk. CONCLUSIONS: Approximately 12% of patients bled while being on NSBB for primary prophylaxis. A higher NSBB dose and dose titration were protective; yet most patients did not have the NSBB dose titrated to the recommended levels. Our data highlight the need for careful monitoring of cirrhotic patients on NSBB.

In vivo diagnostic accuracy of high-resolution microendoscopy in differentiating neoplastic from non-neoplastic colorectal polyps: a prospective study.

OBJECTIVES: High-resolution microendoscopy (HRME) is a low-cost, "optical biopsy" technology that allows for subcellular imaging. The purpose of this study was to determine the in vivo diagnostic accuracy of the HRME for the differentiation of neoplastic from non-neoplastic colorectal polyps and compare it to that of high-definition white-light endoscopy (WLE) with histopathology as the gold standard. METHODS: Three endoscopists prospectively detected a total of 171 polyps from 94 patients that were then imaged by HRME and classified in real-time as neoplastic (adenomatous, cancer) or non-neoplastic (normal, hyperplastic, inflammatory). RESULTS: HRME had a significantly higher accuracy (94%), specificity (95%), and positive predictive value (PPV, 87%) for the determination of neoplastic colorectal polyps compared with WLE (65%, 39%, and 55%, respectively). When looking at small colorectal polyps (less than 10 mm), HRME continued to significantly outperform WLE in terms of accuracy (95% vs. 64%), specificity (98% vs. 40%) and PPV (92% vs. 55%). These trends continued when evaluating diminutive polyps (less than 5 mm) as HRME's accuracy (95%), specificity (98%), and PPV (93%) were all significantly greater than their WLE counterparts (62%, 41%, and 53%, respectively). CONCLUSIONS: In conclusion, this in vivo study demonstrates that HRME can be a very effective modality in the differentiation of neoplastic and non-neoplastic colorectal polyps. A combination of standard white-light colonoscopy for polyp detection and HRME for polyp classification has the potential to truly allow the endoscopist to selectively determine which lesions can be left in situ, which lesions can simply be discarded, and which lesions need formal histopathologic analysis.

Beneath the Surface: A Case Report Revealing a Rare Cystic Neoplasm Hidden Within a Pseudocyst in the Pancreas and a Scientific Literature Review.

Solid pseudopapillary neoplasms (SPNs) of the pancreas are rare tumours with distinctive clinicopathological features. We present a case of a 51-year-old female with a large cystic neoplasm involving the entire pancreas, initially presenting with abdominal pain. Diagnostic imaging revealed a well-defined heterogeneously enhancing mixed solid cystic lesion in the pancreas. Surgical exploration confirmed a lesion in the entire pancreas, prompting total pancreatectomy with duodenectomy. Postoperative histopathology and immunohistochemistry supported the diagnosis of SPN. Herein, we discuss SPN's clinical presentation, diagnostic challenges, surgical management, and pathological characteristics.

Uncovering the diversity of pathogenic invaders: insights into protozoa, fungi, and worm infections.

Post COVID-19, there has been renewed interest in understanding the pathogens challenging the human health and evaluate our preparedness towards dealing with health challenges in future. In this endeavour, it is not only the bacteria and the viruses, but a greater community of pathogens. Such pathogenic microorganisms, include protozoa, fungi and worms, which establish a distinct variety of disease-causing agents with the capability to impact the host's well-being as well as the equity of ecosystem. This review summarises the peculiar characteristics and pathogenic mechanisms utilized by these disease-causing organisms. It features their role in causing infection in the concerned host and emphasizes the need for further research. Understanding the layers of pathogenesis encompassing the concerned infectious microbes will help expand targeted inferences with relation to the cause of the infection. This would strengthen and augment benefit to the host's health along with the maintenance of ecosystem network, exhibiting host-pathogen interaction cycle. This would be key to discover the layers underlying differential disease severities in response to similar/same pathogen infection.

Deep-learning-based image super-resolution of an end-expandable optical fiber probe for application in esophageal cancer diagnostics.

Significance: Endoscopic screening for esophageal cancer (EC) may enable early cancer diagnosis and treatment. While optical microendoscopic technology has shown promise in improving specificity, the limited field of view (<1 mm) significantly reduces the ability to survey large areas efficiently in EC screening. Aim: To improve the efficiency of endoscopic screening, we propose a novel concept of end-expandable endoscopic optical fiber probe for larger field of visualization and for the first time evaluate a deep-learning-based image super-resolution (DL-SR) method to overcome the issue of limited sampling capability. Approach: To demonstrate feasibility of the end-expandable optical fiber probe, DL-SR was applied on simulated low-resolution microendoscopic images to generate super-resolved (SR) ones. Varying the degradation model of image data acquisition, we identified the optimal parameters for optical fiber probe prototyping. The proposed screening method was validated with a human pathology reading study. Results: For various degradation parameters considered, the DL-SR method demonstrated different levels of improvement of traditional measures of image quality. The endoscopists' interpretations of the SR images were comparable to those performed on the high-resolution ones. Conclusions: This work suggests avenues for development of DL-SR-enabled sparse image reconstruction to improve high-yield EC screening and similar clinical applications.