scholarly journals Repeated gain and loss of a single gene modulates the evolution of vascular plant pathogen lifestyles

2020 ◽  
Vol 6 (46) ◽  
pp. eabc4516
Author(s):  
Emile Gluck-Thaler ◽  
Aude Cerutti ◽  
Alvaro L. Perez-Quintero ◽  
Jules Butchacas ◽  
Verónica Roman-Reyna ◽  
...  
Keyword(s):  
Plant Pathogens ◽  
Single Gene ◽  
Vascular Plant ◽  
Symptom Development ◽  
Vascular Pathogenesis ◽  
The Family ◽  
Life Threatening ◽  
Gain And Loss ◽  
Plant Pathogenesis ◽  
Systemic Infections

Vascular plant pathogens travel long distances through host veins, leading to life-threatening, systemic infections. In contrast, nonvascular pathogens remain restricted to infection sites, triggering localized symptom development. The contrasting features of vascular and nonvascular diseases suggest distinct etiologies, but the basis for each remains unclear. Here, we show that the hydrolase CbsA acts as a phenotypic switch between vascular and nonvascular plant pathogenesis. cbsA was enriched in genomes of vascular phytopathogenic bacteria in the family Xanthomonadaceae and absent in most nonvascular species. CbsA expression allowed nonvascular Xanthomonas to cause vascular blight, while cbsA mutagenesis resulted in reduction of vascular or enhanced nonvascular symptom development. Phylogenetic hypothesis testing further revealed that cbsA was lost in multiple nonvascular lineages and more recently gained by some vascular subgroups, suggesting that vascular pathogenesis is ancestral. Our results overall demonstrate how the gain and loss of single loci can facilitate the evolution of complex ecological traits.

scholarly journals Repeated gain and loss of a single gene modulates the evolution of vascular pathogen lifestyles

2020 ◽  
Author(s):  
Emile Gluck-Thaler ◽  
Aude Cerutti ◽  
Alvaro Perez-Quintero ◽  
Jules Butchacas ◽  
Verónica Roman-Reyna ◽  
...  
Keyword(s):  
Single Gene ◽  
Vascular Plant ◽  
Vascular Diseases ◽  
Symptom Development ◽  
Vascular Pathogenesis ◽  
Life Threatening ◽  
Gain And Loss ◽  
Vascular Pathogens ◽  
Plant Pathogenesis ◽  
Systemic Infections

AbstractVascular pathogens travel long distances through host veins leading to life-threatening, systemic infections. In contrast, non-vascular pathogens remain restricted to infection sites, triggering localized symptom development. The contrasting features of vascular and non-vascular diseases suggest distinct etiologies, but the basis for each remains unclear. Here, we show that the hydrolase CbsA acts as a phenotypic switch between vascular and non-vascular plant pathogenesis. cbsA was enriched in genomes of vascular phytopathogenic bacteria in the Xanthomonadaceae family and absent in most non-vascular species. CbsA expression allowed non-vascular Xanthomonas to cause vascular blight while cbsA mutagenesis resulted in reduction of vascular or enhanced non-vascular symptom development. Phylogenetic hypothesis testing further revealed that cbsA was lost in multiple non-vascular lineages and more recently gained by some vascular subgroups, suggesting that vascular pathogenesis is ancestral. Our results overall demonstrate how the gain and loss of single loci can facilitate the evolution of complex ecological traits.

The Chemistry of Drugs to Treat Candida albicans

2019 ◽  
Vol 19 (28) ◽  
pp. 2554-2566 ◽  
Author(s):  
Aurelio Ortiz ◽  
Estibaliz Sansinenea
Keyword(s):  
Candida Species ◽  
Antifungal Drugs ◽  
New Drugs ◽  
Drug Classes ◽  
Life Threatening ◽  
Antifungal Substances ◽  
High Level ◽  
Systemic Infections ◽  
New Compounds ◽  
Level Resistance

Background:: Candida species are in various parts of the human body as commensals. However, they can cause local mucosal infections and, sometimes, systemic infections in which Candida species can spread to all major organs and colonize them. Objective:: For the effective treatment of the mucosal infections and systemic life-threatening fungal diseases, a considerably large number of antifungal drugs have been developed and used for clinical purposes that comprise agents from four main drug classes: the polyenes, azoles, echinocandins, and antimetabolites. Method: : The synthesis of some of these drugs is available, allowing synthetic modification of the molecules to improve the biological activity against Candida species. The synthetic methodology for each compound is reviewed. Results: : The use of these compounds has caused a high-level resistance against these drugs, and therefore, new antifungal substances have been described in the last years. The organic synthesis of the known and new compounds is reported. Conclusion: : This article summarizes the chemistry of the existing agents, both the old drugs and new drugs, in the treatment of infections due to C. albicans, including the synthesis of the existing drugs.

scholarly journals The Early Transcriptional Response of Human Granulocytes to Infection with Candida albicans Is Not Essential for Killing but Reflects Cellular Communications

2006 ◽  
Vol 75 (3) ◽  
pp. 1493-1501 ◽  
Author(s):  
Chantal Fradin ◽  
Abigail L. Mavor ◽  
Günther Weindl ◽  
Martin Schaller ◽  
Karin Hanke ◽  
...  
Keyword(s):  
Candida Albicans ◽  
Mononuclear Cells ◽  
De Novo ◽  
Transcriptional Response ◽  
Mononuclear Leukocytes ◽  
General Notion ◽  
Genes Encoding ◽  
Global Transcriptional Profile ◽  
Life Threatening ◽  
Systemic Infections

ABSTRACT Candida albicans is a polymorphic opportunistic fungus that can cause life-threatening systemic infections following hematogenous dissemination in patients susceptible to nosocomial infection. Neutrophils form part of the innate immune response, which is the first line of defense against microbes and is particularly important in C. albicans infections. To compare the transcriptional response of leukocytes exposed to C. albicans, we investigated the expression of key cytokine genes in polymorphonuclear and mononuclear leukocytes after incubation with C. albicans for 1 h. Isolated mononuclear cells expressed high levels of genes encoding proinflammatory signaling molecules, whereas neutrophils exhibited much lower levels, similar to those observed in whole blood. The global transcriptional profile of neutrophils was examined by using an immunology-biased human microarray to determine whether different morphological forms or the viability of C. albicans altered the transcriptome. Hyphal cells appeared to have the broadest effect, although the most strongly induced genes were regulated independently of morphology or viability. These genes were involved in proinflammatory cell-cell signaling, cell signal transduction, and cell growth. Generally, genes encoding known components of neutrophil granules showed no upregulation at this time point; however, lactoferrin, a well-known candidacidal peptide, was secreted by neutrophils. Addition to inhibitors of RNA or protein de novo synthesis did not influence the killing activity within 30 min. These results support the general notion that neutrophils do not require gene transcription to mount an immediate and direct attack against microbes. However, neutrophils exposed to C. albicans express genes involved in communication with other immune cells.

scholarly journals Metabolic disturbances of the vitamin A pathway in human diaphragmatic hernia

2015 ◽  
Vol 308 (2) ◽  
pp. L147-L157 ◽  
Author(s):  
Karen Coste ◽  
Leonardus W. J. E. Beurskens ◽  
Pierre Blanc ◽  
Denis Gallot ◽  
Amélie Delabaere ◽  
...  
Keyword(s):  
Diaphragmatic Hernia ◽  
Perinatal Death ◽  
Single Gene ◽  
Gene Mutations ◽  
Transcriptional Analysis ◽  
Metabolic Disturbances ◽  
Common Life ◽  
Retinoid Signaling ◽  
Life Threatening ◽  
Surgically Induced

Congenital diaphragmatic hernia (CDH) is a common life-threatening congenital anomaly resulting in high rates of perinatal death and neonatal respiratory distress. Some of the nonisolated forms are related to single-gene mutations or genomic rearrangements, but the genetics of the isolated forms (60% of cases) still remains a challenging issue. Retinoid signaling (RA) is critical for both diaphragm and lung development, and it has been hypothesized that subtle disruptions of this pathway could contribute to isolated CDH etiology. Here we used time series of normal and CDH lungs in humans, in nitrofen-exposed rats, and in surgically induced hernia in rabbits to perform a systematic transcriptional analysis of the RA pathway key components. The results point to CRPBP2, CY26B1, and ALDH1A2 as deregulated RA signaling genes in human CDH. Furthermore, the expression profile comparisons suggest that ALDH1A2 overexpression is not a primary event, but rather a consequence of the CDH-induced lung injury. Taken together, these data show that RA signaling disruption is part of CDH pathogenesis, and also that dysregulation of this pathway should be considered organ specifically.

ANTIBIOTIC SUSCEPTIBILITY PATTERN OF STAPHYLOCOCCOUS AUREUS ISOLATED FROM VARIOUS CLINICAL SPECIMENS OF TERTIARY CARE HOSPITAL IN TIRUPATI.

2021 ◽  
pp. 14-15
Author(s):  
Indira Ananthapadmanab asamy ◽  
V. Pavani Sai Mounika ◽  
K. Vijayakumar ◽  
C.H. Srinivasa Rao
Keyword(s):  
Antimicrobial Susceptibility ◽  
Tertiary Care ◽  
Care Hospital ◽  
Susceptibility Pattern ◽  
Clinical Specimens ◽  
Antimicrobial Susceptibility Pattern ◽  
Wide Range ◽  
Life Threatening ◽  
Mrsa Infection ◽  
Systemic Infections

INTRODUCTION: Staphylococcus aureus causes a wide range of infections including skin and soft tissue infections to life-threatening systemic infections like sepsis, endocarditis. This study ais to evaluate the antimicrobial susceptibility pattern of S.aurues among various clinical specimens. METHODS: The study included 326 S.aurues, isolated from various clinical specimens which were subjected to antimicrobial susceptibility testing as per CLSI guidelines. RESULTS: Among the 326 isolates, the highest were from pus specimens (47.85%), and was from Orthopaedics department (28.53%). Among the isolates, 219 (67.17%) were Methicilin resistant. All isolates were sensitive to Vancomycin, and all urine isolates were sensitive to Nitrofurantoin. The highest resistance was towards Penicillin (87.42%), Erythromycin (85.28), and Ciprooxacin (83.13%). CONCLUSION: The most effective way to prevent MRSA infection in every hospital is by performing continuous surveillance of antibiotic resistance and by following an effetive antibiotic policy.

The Titer of Citrus Yellow Vein Clearing Virus is Positively Associated with the Severity of Symptoms in Infected Citrus Seedlings

Plant Disease ◽  
2021 ◽  
Author(s):  
Yu Bin ◽  
Jianjian Xu ◽  
Zhimin Ma ◽  
Yu Duan ◽  
Qi Zhang ◽  
...  
Keyword(s):  
Biological Properties ◽  
Yellow Vein ◽  
Citrus Limon ◽  
Cdna Clones ◽  
Symptom Development ◽  
Vein Clearing ◽  
Reverse Transcription Pcr ◽  
The Family ◽  
Citrus Production ◽  
Dialeurodes Citri

Citrus yellow vein clearing virus is a new member of the genus Mandarivirus in the family Alphaflexiviridae. Citrus yellow vein clearing virus (CYVCV) is the causal agent of citrus yellow vein clearing disease and is widely distributed in Pakistan, India, Turkey, and China. CYVCV is transmitted from citrus to citrus by Dialeurodes citri, grafting, and contaminated knife blades, threatening citrus production. In this study, four infectious full-length cDNA clones of CYVCV (namely AY112, AY132, AY212, and AY221) derived from CYVCV isolate AY were obtained through yeast homologous recombination and inoculated to ‘Eureka’ lemon (Citrus limon Burm. f.) by Agrobacterium-mediated vacuum infiltration. Pathogenicity analysis indicated that the clones AY212 and AY221 caused more severe symptoms than AY112 and AY132. Northern blot and quantitative reverse transcription PCR (qRT-PCR) analyses showed that the titers of virulent clones (AY212 and AY221) were significantly higher than those of attenuated clones (AY112 and AY132) in the infected ‘Eureka’ lemon (Citrus limon Burm. f.) seedlings. Subsequent comparative studies of viral infectivity, accumulation, and symptoms induced by AY221 in nine citrus cultivars indicated that (i) the infectivity of AY221 varied from 25% to 100% among different cultivars; (ii) ‘Oota’ ponkan (C. reticulata L.) showed the lowest infection rate with mild symptoms, which might be a useful resource for CYVCY-resistance genes; (iii) CYVCV titer was positively associated with the symptom development in infected citrus seedlings. In general, this report revealed the biological properties of CYVCV, thus laying a foundation for further investigation of pathogenic mechanisms in this virus.

Urocystis agropyri (flag smut of wheat).

2021 ◽  
Author(s):  
Keyword(s):  
Triticum Aestivum ◽  
North America ◽  
Host Range ◽  
Wheat Straw ◽  
Crop Plants ◽  
Widespread Species ◽  
Flag Smut ◽  
Worldwide Distribution ◽  
The Family ◽  
Systemic Infections

Abstract U. agropyri causes flag smut on leaves of species in the family Poaceae. As a pathogen of grasses, it appears to have a wide host range (Mordue and Waller, 1981) and a worldwide distribution (UK CAB International, 1991). However, some authorities do not include the pathogen on wheat [Triticum aestivum], identified as Urocystis tritici, within U. agropyri. Rossman et al. (2006) place U. agropyri in the category of a "Threat to Major Crop Plants" and wheat and wheat straw imports are restricted in North America (Anon., 2005; CFIA, 2008). If the widespread species includes the wheat pathogen, then it is already present on all continents with agriculture and in major wheat-growing areas (Purdy, 1965), so it has already been introduced and may be difficult to exclude from additional areas. Both smuts are seed- and soil-borne, causing systemic infections that can be perennial in weeds and graminaceous crops, including turfgrasses. The spore balls are windborne (Purdy, 1965) and prevention of spread among wild grasses on land is not amenable to control.

Post-intensive care syndrome (PICS) in children

2021 ◽  
pp. 95-105
Author(s):  
L. K. Karimova ◽  
V. O. Belash
Keyword(s):  
Mental Health ◽  
Intensive Care ◽  
Critically Ill ◽  
Pediatric Intensive Care ◽  
Functional Disorders ◽  
Mental Health Diagnosis ◽  
The Family ◽  
Life Threatening ◽  
Post Intensive Care Syndrome ◽  
Health Diagnosis

The survival rate of children who require intensive care for life-threatening diseases or injuries has recently increased significantly. In pediatric intensive care, a decrease in mortality is accompanied by an increase in morbidity. This trend has led to a shift in focus of attention from reducing mortality to optimizing outcomes in critically ill patients. A broader approach and focus on outcome in critically ill survivors has been greatly facilitated by the development of a concept that integrates post-intensive care (PIC) diseases into Post Intensive Care Syndrome (PICS). The concept of PIC syndrome implies the occurrence of disorders in patients after IC in three main areas: mental health, cognitive functions and physical health, and also takes into account the state of the family of surviving patients, in particular, parents, who often have a deterioration in mental health. Diagnosis and treatment of this condition involves the work of a multidisciplinary team, in which it is desirable to include an osteopathic doctor in order to more effectively and timely diagnose and correct reversible functional disorders.

Impact on the family

2021 ◽  
pp. 111-125
Author(s):  
Veronica Dussel ◽  
Barbara Jones
Keyword(s):  
Social Care ◽  
Family Members ◽  
Well Being ◽  
Family Unit ◽  
Health And Social Care ◽  
The Family ◽  
Threatening Condition ◽  
Life Threatening ◽  
Limiting Condition ◽  
The Impact

In this chapter, we will focus on the importance of caring for the family of a child with a life-limiting condition (LLC) or life-threatening condition as a unit, each of the family members being integral to the well-being and care of the others. We recognize that the family unit itself is embedded within a wider context including the health and social care system, and more broadly within its society and culture. We discuss the concept of family, exploring the impact of having a child with an LLC, and how families adjust to this. We then expand on considerations about how to offer effective and timely support and help. We have included parents’ narratives with the aim of adding depth to the discussion, and in recognition of the truth of families’ own experiences.

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