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1.
Vet J ; 263: 105532, 2020 Sep.
Article in English | MEDLINE | ID: mdl-32928493

ABSTRACT

Bovine respiratory syncytial virus (BRSV) and bovine parainfluenza-3 virus (bPI3V) are major causes of bovine respiratory disease (BRD) in newborn calves worldwide. Vaccination is widely used to prevent BRD, and intranasal vaccines for BRSV and bPI3V were developed to overcome interference from BRSV and bPI3V-specific maternally derived antibodies. Many experimental challenge trials have demonstrated that intranasal vaccines for BRSV and bPI3V are efficacious, but effectiveness under field conditions has been demonstrated less often, especially for newborn beef calves. The objective of this field trial was to compare the effectiveness of a newly available commercial BRSV-bPI3V intranasal vaccine with that of a benchmarked one in newborn beef calves reared in a cow-calf system. A total of 935 calves from 39 farms were randomized into two vaccine groups (Bovalto Respi Intranasal [Vaccine A], n=468; Rispoval RS+PI3 Intranasal [Vaccine B], n=467), and monitored during the in-house risk period up to three months after vaccination. Non-inferiority analysis was performed by calculating the difference in BRD prevalence between the two vaccine groups. No significant differences were observed between vaccines regarding clinical outcomes of morbidity, mortality, duration between vaccination and BRD occurrence, or treatments required. Because the upper limit of the 2-sided 95% confidence interval of the difference in BRD prevalence between the two treatment groups (0.8%) was less than the margin of non-inferiority (δ=5%), a non-inferiority of Vaccine A was concluded. In conclusion, Vaccine A is at least as effective as Vaccine B for the prevention of BRD in newborn beef cattle in a cow-calf system under field conditions.


Subject(s)
Animals, Newborn , Cattle Diseases/prevention & control , Parainfluenza Virus 3, Bovine/immunology , Respiratory Syncytial Virus, Bovine/immunology , Respiratory Tract Infections/veterinary , Viral Vaccines/administration & dosage , Administration, Intranasal/veterinary , Animals , Cattle , Female , Male , Respiratory Syncytial Virus Infections/prevention & control , Respiratory Syncytial Virus Infections/veterinary , Respiratory Tract Infections/prevention & control , Respiratory Tract Infections/virology , Respirovirus Infections/prevention & control , Respirovirus Infections/veterinary , Treatment Outcome
2.
Ann Cardiol Angeiol (Paris) ; 68(1): 1-5, 2019 Feb.
Article in French | MEDLINE | ID: mdl-30292444

ABSTRACT

INTRODUCTION: Risk stratification allows outpatient management of low-risk pulmonary embolism (PE). Here, we carry out an evaluation of the professional practices on the emergency management of low-risk PE, after selection with the sPESI score. MATERIAL AND METHOD: All patients admitted to the emergency department of Chambéry hospital, with a final diagnosis of PE are analyzed. The PE of score sPESI at 0 are included, in the absence of contraindications. Ninety-day follow-up is done. The objective is to evaluate the proportion of ambulatory care for low-risk patients. RESULTS: Eighty PE were diagnosed in 2016, 28 with sPESI score at 0 and 3 patients excluded. Of the 25 inclusions, 6 patients had signs of right ventricular dysfunction and were therefore hospitalized. The remaining 19 were eligible for outpatient care but only 8 of them stayed less than 24hours in the hospital. DISCUSSION: The sPESI score is a decision support tool for outpatient management but should not be used alone. The search for right ventricular dysfunction seems important here.


Subject(s)
Ambulatory Care/statistics & numerical data , Decision Support Techniques , Patient Admission/statistics & numerical data , Pulmonary Embolism/diagnosis , Pulmonary Embolism/therapy , Risk Assessment , Emergency Service, Hospital , Female , France , Humans , Male , Middle Aged , Prospective Studies , Ventricular Dysfunction, Right/diagnosis
3.
Ann Cardiol Angeiol (Paris) ; 65(5): 322-325, 2016 Nov.
Article in French | MEDLINE | ID: mdl-27693164

ABSTRACT

In the emergency department, the management of patients with pulmonary embolism depends on the early mortality risk. Outpatient care is possible in low-risk patients. We present the existing scores and the strategy proposed by the North Alps Emergency Network, which uses the simplified PESI score (Pulmonary Embolism Severity Index) to select those low-risk patients, candidates for early discharge.


Subject(s)
Emergency Service, Hospital , Outpatient Clinics, Hospital , Pulmonary Embolism/diagnosis , Pulmonary Embolism/therapy , Adult , Aged , Aged, 80 and over , Algorithms , Female , Humans , Male , Middle Aged , Patient Admission , Patient Selection , Prospective Studies , Pulmonary Embolism/mortality , Risk Assessment/statistics & numerical data , Survival Analysis
4.
Orthop Traumatol Surg Res ; 96(1): 49-56, 2010 Feb.
Article in English | MEDLINE | ID: mdl-20170857

ABSTRACT

INTRODUCTION: Implant infection is serious; prevention is mandatory, and requires assessment.The present study assessed the incidence of deep surgical-site infection (SSI) at 1 year following total knee arthroplasty (TKA) and adherence to skin preparation, antibiotic prophylaxis,screening and prevention in case of methicillin-resistant S. aureus (MRSA). HYPOTHESIS: Adherence to prevention measures reduces infection risk secondary to TKA. MATERIAL AND METHODS: A prospective study of the incidence of SSI following primary TKA was run from December 1st 2005 to December 31st 2006 in a continuous series of 364 operations in 359 patients, excluding cases of septic or aseptic revision. Each implant was followed up for 12 months. Adherence to practice was assessed by independent observers. Antibiotic prophylaxis was assessed; skin preparation was scored (out of 10); MRSA was systematically screened for, and preventive measures were assessed in positive cases. Median follow-up was 12 months.Patients with less than 11 months' FU were contacted by telephone. Median age was 72 years(range, 45-92 years). Eighty-seven percent of patients had ASA scores of 2; 14% were diabetic,and 42% obese. Mean surgery time was 70 min (range, 30-164 min). Among the implants, 81.5% were cemented. Eighty-six percent of operations had NNIS scores of 0. Infection risk linked to theater environment and teams was under control. RESULTS: Fourteen patients were lost to follow-up and excluded from analysis. The incidence of infection was 1.4% (n = 5/350) (95% CI [0.41-3.22]). Three of the infections were early (

Subject(s)
Arthroplasty, Replacement, Knee , Knee Prosthesis , Prosthesis-Related Infections/prevention & control , Aged , Aged, 80 and over , Antibiotic Prophylaxis , Chi-Square Distribution , Disinfection/methods , Female , Humans , Male , Middle Aged , Prospective Studies , Prosthesis-Related Infections/epidemiology , Risk Factors , Skin/microbiology , Statistics, Nonparametric
5.
Cytogenet Genome Res ; 110(1-4): 70-90, 2005.
Article in English | MEDLINE | ID: mdl-16093660

ABSTRACT

The aim of this review is to describe the level of intimacy between Ty retrotransposons (Ty1-Ty5) and their host the yeast Saccharomyces cerevisiae. The effects of Ty location in the genome and of host proteins on the expression and mobility of Ty elements are highlighted. After a brief overview of Ty diversity and evolution, we describe the factors that dictate Ty target-site preference and the impact of targeting on Ty and adjacent gene expression. Studies on Ty3 and Ty5 have been especially informative in unraveling the role of host factors (Pol III machinery and silencing proteins, respectively) and integrase in controlling the specificity of integration. In contrast, not much is known regarding Ty1, Ty2 and Ty4, except that their insertion depends on the transcriptional competence of the adjacent Pol III gene and might be influenced by some chromatin components. This review also brings together recent findings on the regulation of Ty1 retrotransposition. A large number of host proteins (over 30) involved in a wide range of cellular processes controls either directly or indirectly Ty1 mobility, primarily at post-transcriptional steps. We focus on several genes for which more detailed analyses have permitted the elaboration of regulatory models. In addition, this review describes new data revealing that repression of Ty1 mobility also involves two forms of copy number control that act at both the trancriptional and post-transcriptional levels. Since S. cerevisiae lacks the conserved pathways for copy number control via transcriptional and post-transcriptional gene silencing found in other eukaryotes, Ty1 copy number control must be via another mechanism whose features are outlined. Ty1 response to stress also implicates activation at both transcriptional and postranscriptional steps of Ty1. Finally, we provide several insights in the role of Ty elements in chromosome evolution and yeast adaptation and discuss the factors that might limit Ty ectopic recombination.


Subject(s)
Evolution, Molecular , Retroelements , Saccharomyces cerevisiae/genetics , Transcription, Genetic , Models, Genetic
6.
Ann N Y Acad Sci ; 1033: 168-76, 2004 Nov.
Article in English | MEDLINE | ID: mdl-15591014

ABSTRACT

Nutritional factors are among the postulated causes of fatigue, a highly prevalent symptom in the cancer population, with serious impact on patients' quality of life. Deficiency of the micronutrient carnitine may play a role by reducing energy production through fatty acid oxidation. We present preliminary data of an open-label, dose-finding study to determine safety and maximally tolerated dose (MTD) of 1 week of L-carnitine supplementation in cancer patients with fatigue and carnitine deficiency. Patients who met inclusion/exclusion criteria underwent carnitine level determination. Eighty-three percent of these patients (15/18) had carnitine deficiency. Preliminary data analysis of 13 patients showed that total carnitine increased from 30.0 +/- 6.9 to 41.0 +/- 12.1 (mean +/- SD) after 1 week of supplementation (P = 0.01), and free carnitine increased from 24.3 +/- 6.1 to 33.8 +/- 9.8 (P = 0.004). Outcome measures were fatigue (BFI score), depression (CES-D), sleep disruption (ESS), and performance status (Karnofsky). Median (min, max) BFI score at baseline was 73 (46, 82) versus 50 (3, 82) after 1-week supplementation (P = 0.009). CES-D score at baseline was 29 (16, 42) and 22 (8, 32) after 1 week (P = 0.028). ESS at baseline was 46.5 (0, 69) and 30.4 (0, 72) after 1 week (P = 0.015). Karnofsky score did not change significantly (P = 0.38). We are currently conducting a randomized, double-blind, placebo-controlled study to rigorously assess the role of L-carnitine for the treatment of fatigue and depression in cancer patients.


Subject(s)
Carnitine/pharmacology , Depression/drug therapy , Fatigue/drug therapy , Neoplasms/complications , Dietary Supplements , Female , Humans , Male , Middle Aged , Neoplasms/psychology , Randomized Controlled Trials as Topic
7.
Rev Chir Orthop Reparatrice Appar Mot ; 88(4): 359-64, 2002 Jun.
Article in French | MEDLINE | ID: mdl-12124535

ABSTRACT

PURPOSE OF THE STUDY: This study was undertaken to determine the reproducibility of measurements of fatty degeneration of the rotator cuff using computed tomography (CT). MATERIAL AND METHODS: Fifty-six patients who had undergone surgery for rotator cuff tear were included in this retrospective study. The extent of fatty infiltration was evaluated on CT scans with soft tissue windows in all 56 shoulders using a five-stage scoring system described by Goutallier. Five independent observers made the assessments. The same operation was repeated one month later to test intraobserver agreement. Four parameters were recorded: fatty infiltration of three muscles (supraspinatus, infraspinatus, subscapularis), and overall fatty infiltration grading. Interobserver variability was determined for each parameter using the intercorrelation coefficient (a test of reproducibility of quantitative measurements). RESULTS: The most reproducible measurement was the overall fatty infiltration grade. For this parameter, interobserver agreement was good with an intercorrelation coefficient of 0.75. The interval of confidence was +/- 0.5. Intraobserver agreement depended on the observer's level of experience. It was good for overall fatty infiltration grade assess by three senior observers (r=0.78) and moderate for two junior observers. CONCLUSION: The overall fatty infiltration grade is a reproducible parameter that should be used to evaluate the degree of fatty infiltration as the safety margin of this value (graded 0 to 4) is about 0.5. Fatty infiltration of a torn cuff would not be the only criterion to improve indications for treatment of rotator cuff tears.


Subject(s)
Adipose Tissue , Muscular Diseases/diagnostic imaging , Muscular Diseases/etiology , Rotator Cuff Injuries , Tomography, X-Ray Computed/standards , Female , Humans , Male , Middle Aged , Muscular Diseases/classification , Observer Variation , Retrospective Studies , Sensitivity and Specificity , Severity of Illness Index
8.
Curr Genet ; 39(5-6): 291-6, 2001 Jul.
Article in English | MEDLINE | ID: mdl-11525401

ABSTRACT

In Saccharomyces cerevisiae, the KSS1 gene encodes the MAP kinase of the invasive/filamentous growth pathway. In addition to its role in this signal transduction pathway, Kssl can replace the Fus3 MAP kinase in the pheromone-response pathway, in the absence of FUS3. Previous work indicated that derivatives of the S288C strain carry a mutant kss1 allele. Here, we report evidence that S288C derivatives used in the Yeast Genome Sequencing Programme carry a functional KSS1 gene and can thus be used to study the regulation of gene expression by KSS1.


Subject(s)
Fungal Proteins/genetics , Genome, Fungal , Mitogen-Activated Protein Kinases/genetics , Saccharomyces cerevisiae Proteins , Amino Acid Sequence , Amino Acid Substitution , Fungal Proteins/chemistry , Fungal Proteins/metabolism , Genotype , Mitogen-Activated Protein Kinases/chemistry , Mitogen-Activated Protein Kinases/metabolism , Molecular Sequence Data , Mutagenesis, Site-Directed , Pheromones/physiology , Recombinant Proteins/chemistry , Recombinant Proteins/metabolism
9.
Pain Med ; 2(2): 121-30, 2001 Jun.
Article in English | MEDLINE | ID: mdl-15102301

ABSTRACT

The approach to management of patients with advanced disease and serious illness has been strongly influenced by advances in science and technology, the increasing role of ethics in clinical practice, and the recognition of new rights and social changes. At the present time, decision making is modulated by ethical and legal considerations. One of the challenges of clinical practice is to maintain the delicate balance between the technical aspects and the humanistic aspects of care. For the resolution of this challenge, this article proposes an ethical and legal framework that considers the goals of care and respects the basic values of autonomy, beneficence, and justice. Ethical and legal principles complement sound medical practice but should never replace it. At all times, clarification of the medical situation, good communication, and information about state of the art treatment proposals are essential. In the context of advanced illness, the most prominent issues relate to decision making, justice, and research.

10.
Mol Cell Biol ; 20(15): 5766-76, 2000 Aug.
Article in English | MEDLINE | ID: mdl-10891512

ABSTRACT

Using a set of genomic TY1A-lacZ fusions, we show that Ste12 and Tec1, two transcription factors of the Kss1 mitogen-activated protein kinase (MAPK) cascade activate Ty1 transcription in Saccharomyces cerevisiae. This result strongly suggests that the invasive-filamentous pathway regulates Ty1 transcription. Since this pathway is active in diploid cells, we suspected that Ty1 transposition might occur in this cell type, despite the fact that this event has been never reported before (unless activated by heterologous promoters such as that of GAL1). We demonstrate here that constitutive activation of the invasive-filamentous pathway by the STE11-4 allele or by growth in low-nitrogen medium induces Ty1 transcription and retrotransposition in diploid cells. We show that Ty1 retrotransposition can be activated by STE11-4 in haploid cells as well. Our findings provide the first evidence that Ty1 retrotransposition can be activated by environmental signals that affect differentiation. Activation of the Kss1 MAPK cascade by stress is known to cause filament formation that permits the search for nutrients away from the colonization site. We propose that activation of Ty1 retrotransposition by this cascade could play a role in adaptive mutagenesis in response to stress.


Subject(s)
Fungal Proteins/metabolism , Mitogen-Activated Protein Kinases/metabolism , Retroelements , Saccharomyces cerevisiae Proteins , Saccharomyces cerevisiae/physiology , Schizosaccharomyces pombe Proteins , Adaptation, Physiological/genetics , DNA-Binding Proteins/genetics , DNA-Binding Proteins/metabolism , Diploidy , Fungal Proteins/genetics , Gene Expression Regulation, Fungal , MAP Kinase Signaling System , Mitogen-Activated Protein Kinases/genetics , Nitrogen/metabolism , Transcription Factors/genetics , Transcription Factors/metabolism , Transcription, Genetic
11.
Lancet ; 353(9165): 1695-700, 1999 May 15.
Article in English | MEDLINE | ID: mdl-10335806

ABSTRACT

Patients with cancer have diverse symptoms, impairments in physical and psychological functioning, and other difficulties that can undermine their quality of life. If inadequately controlled, pain can have a profoundly adverse impact on the patient and his or her family. The critical importance of pain management as part of routine cancer care has been forcefully advanced by WHO, international and national professional organisations, and governmental agencies. The prevalence of chronic pain is about 30-50% among patients with cancer who are undergoing active treatment for a solid tumour and 70-90% among those with advanced disease. Prospective surveys indicate that as many as 90% of patients could attain adequate relief with simple drug therapies, but this success rate is not achieved in routine practice. Inadequate management of pain is the result of various issues that include: undertreatment by clinicians with insufficient knowledge of pain assessment and therapy; inappropriate concerns about opioid side-effects and addiction; a tendency to give lower priority to symptom control than to disease management; patients under-reporting of pain and non-compliance with therapy; and impediments to optimum analgesic therapy in the healthcare system. To improve the management of cancer pain, every practitioner involved in the care of these patients must ensure that his or her medical information is current and that patients receive appropriate education.


Subject(s)
Neoplasms/complications , Pain Management , Acute Disease , Analgesics, Opioid/administration & dosage , Chronic Disease , Humans , Pain/drug therapy , Pain/etiology , Pain Measurement , Practice Guidelines as Topic , Syndrome
12.
Cancer Control ; 6(2): 136-145, 1999 Mar.
Article in English | MEDLINE | ID: mdl-10758542

ABSTRACT

BACKGROUND: Pain is a prevalent symptom in cancer patients, affecting up to 50% of patients undergoing active cancer treatment and up to 90% of those with advanced disease. Although adequate relief can be achieved in the majority of cancer patients, pain is often treated inadequately in traditional settings. METHODS: The authors use their experience and that of others to review the evaluation and diagnosis of pain syndromes and the principles of management. RESULTS: The World Health Organization and other governmental agencies have recognized the importance of pain management as part of routine cancer care. Conducting a comprehensive assessment, competently providing analgesic drugs, and communicating with the patient and family allow effective management of pain in the cancer patient. CONCLUSIONS: Several approaches can promote adequate management of cancer pain, such as enhancing clinician knowledge of pain syndromes, improving pain assessment, and updating medical information related to pain and symptom control.

13.
Article in French | MEDLINE | ID: mdl-9515134

ABSTRACT

PURPOSE OF THE STUDY: Fractures of the lateral malleolus associated with rupture of the deltoid ligament are severe fractures types. There is still discussion about wether the ruptured deltoid ligament should be sutured or not. To elucidate further the need for surgical repair of this structure a comparative and retrospective review was conducted at a mean follow-up of 4 years and 8 months. MATERIAL AND METHODS: Twenty nine men and 15 women were included with a mean age of 34 years. Patients were subdivided into two groups according to the attitude regarding the ligament. In the first group (n = 18), an operative repair of the ligament was made and in the second group (n = 17) we leaved it unrepaired. Nine patients were evaluated separately because of an associated osteochondral fracture (n = 7) or a worse reduction of the fibula (n = 2). Subjective and objective clinical assessment were evaluated according to a modified Cedell classification. Roentgenograms including A.P, lateral, mortise view and a external rotation stress view described by Kleiger were obtained in all patients. RESULTS: Subjective and objective analysis showed no significant difference between the two groups, likewise no differences were observed for post operative complications rate. Medial instability was observed in four cases (2 in group 1 and 2 in group II). Roentgenographicaly, more ossifications of the deltoid ligament were founded in group II (p = 0.013), and only one degenerative osteoarthritis of the ankle was seen in group II. Clinical results in the group of patients with osteochondral fracture were statistically worse than in the two previous groups (p = 0.001), with frequent progression to osteoarthritis in four cases. DISCUSSION: In our experience it is impossible to advise surgical repair of the deltoid ligament in accordance to the type of lateral malleolar fracture like other authors have suggested. The existence of a significant widening of the medial space greater than 3 mm was nearly correlated with a deltoid ligament disruption, of the 23 patients treated with a medial approach, the ligament was ruptured in 22 cases. In this study, we may conclude than an untreated rupture of the deltoid ligament does not lead to instability. The advantages of the deltoid repair may be obtained if the fixation of the lateral malleolus allows a perfect congruency of the mortise. The most predictive radiographic factors for a poor outcome were a persistent widening of the medial joint greater than 3 mm, an associated osteochondral fracture and a poor reduction of the lateral malleolus which results in degenerative arthritis of the ankle at long term follow-up. CONCLUSION: Repair of the deltoid ligament is unnecessary if the internal fixation of the fibula achieves an anatomical reconstitution of the mortise. Exploration of the medial side is indicated only with a medial incongruency greater than 3 mm on intra operative roentgenograms.


Subject(s)
Ankle Injuries/surgery , Fracture Fixation, Internal/methods , Fractures, Closed/surgery , Tendons , Adult , Female , Follow-Up Studies , Humans , Male , Range of Motion, Articular , Rupture , Tendon Injuries , Tendons/surgery
14.
Mol Cell Biol ; 16(5): 1921-8, 1996 May.
Article in English | MEDLINE | ID: mdl-8628258

ABSTRACT

The SNF1 protein kinase has been widely conserved in plants and mammals. In Saccharomyces cerevisiae, SNF1 is essential for expression of glucose-repressed genes in response to glucose deprivation. Previous studies supported a role for SNF1 in relieving transcriptional repression. Here, we report evidence that SNF1 modulates function of a transcriptional activator, SIP4, which was identified in a two-hybrid screen for interaction with SNF1. The N terminus of the predicted 96-kDa SIP4 protein is homologous to the DNA-binding domain of the GAL4 family of transcriptional activators, with a C6 zinc cluster adjacent to a coiled-coil motif The C terminus contains a leucine zipper motif and an acidic region. When bound to DNA, a LexA-SIP4 fusion activates transcription of a reporter gene. Transcriptional activation by SIP4 is regulated by glucose and depends on the SNF1 protein kinase. Moreover, SIP4 is differentially phosphorylated in response to glucose availability, and phosphorylation requires SNF1. These findings suggest that the SNF1 kinase interacts with a transcriptional activator to modulate its activity and provide the first direct evidence for a role of SNF1 in activating transcription in response to glucose limitation.


Subject(s)
Gene Expression Regulation, Fungal , Protein Serine-Threonine Kinases/metabolism , Saccharomyces cerevisiae Proteins , Saccharomyces cerevisiae/genetics , Saccharomyces cerevisiae/metabolism , Trans-Activators/metabolism , Transcription Factors , Amino Acid Sequence , Base Sequence , Basic-Leucine Zipper Transcription Factors , Cloning, Molecular , Consensus Sequence , DNA Primers , DNA-Binding Proteins , Fungal Proteins/chemistry , Fungal Proteins/metabolism , Gene Expression Regulation, Fungal/drug effects , Glucose/pharmacology , Leucine Zippers , Molecular Sequence Data , Polymerase Chain Reaction , Sequence Homology, Amino Acid , Suppression, Genetic , Trans-Activators/biosynthesis , Trans-Activators/chemistry , Zinc Fingers , beta-Galactosidase/biosynthesis
15.
Nucleic Acids Res ; 22(24): 5332-40, 1994 Dec 11.
Article in English | MEDLINE | ID: mdl-7816623

ABSTRACT

While screening for genes that affect the synthesis of yeast snRNPs, we identified a thermosensitive mutant that abolishes the production of a reporter snRNA at the non-permissive temperature. This mutant defines a new gene, named BDF1. In a bdf1-1 strain, the reporter snRNA synthesized before the temperature shift remains stable at the non-permissive temperature. This demonstrates that the BDF1 gene affects the synthesis rather than the stability of the reporter snRNA and suggests that the BDF1 gene encodes a transcription factor. BDF1 is present in single copy on yeast chromosome XII, and is important for normal vegetative growth but not essential for cell viability. bdf1 null mutants share common phenotypes with several mutants affecting general transcription and are defective in snRNA production. BDF1 encodes a protein of 687 amino-acids containing two copies of the bromodomain, a motif also present in other transcription factors as well as a new conserved domain, the ET domain, also present in Drosophila and human proteins.


Subject(s)
Gene Expression Regulation, Fungal/physiology , RNA, Small Nuclear/biosynthesis , Saccharomyces cerevisiae Proteins , Saccharomyces cerevisiae/genetics , Transcription Factors/genetics , Amino Acid Sequence , Base Sequence , Chromosome Mapping , Chromosomes, Fungal , Cloning, Molecular , Conserved Sequence , Gene Dosage , Genes, Fungal/genetics , Genes, Regulator/genetics , Molecular Sequence Data , Mutation , Sequence Alignment , Sequence Analysis, DNA , Temperature , Transcription Factors/physiology
16.
Nucleic Acids Res ; 22(4): 597-603, 1994 Feb 25.
Article in English | MEDLINE | ID: mdl-8127709

ABSTRACT

The Saccharomyces cerevisiae SIP3 gene was identified in a two-hybrid screen for proteins that interact in vivo with the SNF1 protein kinase, which is necessary for release of glucose repression. We showed that the C-terminal part of SIP3, recovered through its ability to interact with SNF1, strongly activates transcription when tethered to DNA. We have cloned and sequenced the entire SIP3 gene. The predicted 142-kD SIP3 protein contains a putative leucine zipper motif located in its C terminus. The native SIP3 protein also interacts with DNA-bound SNF1 and activates transcription of a target gene. A complete deletion of the SIP3 gene did not confer phenotypes characteristic of snf1 mutants. However, in a mutant deficient for the SNF1 kinase activity due to loss of the SNF4 stimulatory function, increased dosage of SIP3 partially restored expression of the glucose-repressible SUC2 gene. Overexpression of the C terminus of SIP3 caused defects in growth and SUC2 expression which were remedied by overexpressing SNF1. Taken together, these genetic data suggest that SIP3 is functionally related to the SNF1 protein kinase pathway.


Subject(s)
Fungal Proteins/genetics , Genes, Fungal , Protein Serine-Threonine Kinases/metabolism , Saccharomyces cerevisiae Proteins , Saccharomyces cerevisiae/metabolism , Transcription Factors/genetics , Amino Acid Sequence , Base Sequence , Cloning, Molecular , Fungal Proteins/metabolism , Gene Expression Regulation, Enzymologic , Gene Expression Regulation, Fungal , Molecular Sequence Data , Plasmids , Transcription Factors/metabolism , Transcription, Genetic
17.
J Mol Biol ; 228(2): 366-86, 1992 Nov 20.
Article in English | MEDLINE | ID: mdl-1453449

ABSTRACT

The Escherichia coli infC-rpmI-rplT operon encodes translation initiation factor IF3 and the ribosomal proteins, L35 and L20, respectively. The expression of the last cistron (rplT) has been shown to be negatively regulated at a post-transcriptional level by its own product, L20, which acts at an internal operator located within infC. The present work shows that L20 directly represses the expression of rpmI, and indirectly that of rplT, via translational coupling with rpmI. Deletions and an inversion of the coding region of rpmI, suggest an mRNA secondary structure forming between sequences within rpmI and the translation initiation site of rplT. To verify the existence of this structure, detailed analyses were performed using chemical and enzymatic probes. Also, mutants that uncoupled rplT expression from that of rpmI, were isolated. The mutations fall at positions that would base-pair in the secondary structure. Our model is that L20 binds to its operator within infC and represses the translation of rpmI. When the rpmI mRNA is not translated, it can base-pair with the ribosomal binding site of rplT, sequestering it, and abolishing rplT expression. If the rpmI mRNA is translated, i.e. covered by ribosomes, the inhibitory structure cannot form leaving the translation initiation site of rplT free for ribosomal binding and for full expression. Although translational coupling in ribosomal protein operons has been suspected to be due to the formation of secondary structures that sequester internal ribosomal binding sites, this is the first time that such a structure has been shown to exist.


Subject(s)
Bacterial Proteins/genetics , Escherichia coli Proteins , Peptide Initiation Factors/genetics , Protein Biosynthesis , RNA, Messenger/genetics , Ribosomal Proteins/genetics , Base Sequence , DNA, Bacterial , Gene Expression Regulation, Bacterial , Molecular Sequence Data , Nucleic Acid Conformation , Operon , Prokaryotic Initiation Factor-3 , RNA, Messenger/chemistry , Restriction Mapping , Transcription, Genetic
18.
J Mol Biol ; 227(3): 621-34, 1992 Oct 05.
Article in English | MEDLINE | ID: mdl-1383551

ABSTRACT

The expression of the gene for threonyl-tRNA synthetase (thrS) is negatively autoregulated at the translational level in Escherichia coli. The synthetase binds to a region of the thrS leader mRNA upstream from the ribosomal binding site inhibiting subsequent translation. The leader mRNA consists of four structural domains. The present work shows that mutations in these four domains affect expression and/or regulation in different ways. Domain 1, the 3' end of the leader, contains the ribosomal binding site, which appears not to be essential for synthetase binding. Mutations in this domain probably affect regulation by changing the competition between the ribosome and the synthetase for binding to the leader. Domain 2, 3' from the ribosomal binding site, is a stem and loop with structural similarities to the tRNA(Thr) anticodon arm. In tRNAs the anticodon loop is seven nucleotides long, mutations that increase or decrease the length of the anticodon-like loop of domain 2 from seven nucleotides abolish control. The nucleotides in the second and third positions of the anticodon-like sequence are essential for recognition and the nucleotide in the wobble position is not, again like tRNA(Thr). The effect of mutations in domain 3 indicate that it acts as an articulation between domains 2 and 4. Domain 4 is a stable arm that has similarities to the acceptor arm of tRNA(Thr) and is shown to be necessary for regulation. Based on this mutational analysis and previous footprinting experiments, it appears that domains 2 and 4, those analogous to tRNA(Thr), are involved in binding the synthetase which inhibits translation probably by interfering with ribosome loading at the nearby translation initiation site.


Subject(s)
Gene Expression Regulation, Enzymologic/genetics , Protein Biosynthesis/genetics , RNA, Messenger/genetics , RNA, Transfer, Thr/genetics , Threonine-tRNA Ligase/genetics , Base Sequence , Escherichia coli/genetics , Gene Expression Regulation, Bacterial/genetics , Molecular Sequence Data , Mutagenesis, Site-Directed/genetics , Nucleic Acid Conformation , RNA, Bacterial/genetics , RNA, Messenger/metabolism , RNA, Transfer, Thr/metabolism , Recombinant Fusion Proteins/genetics , Threonine-tRNA Ligase/metabolism
19.
Virology ; 186(2): 684-92, 1992 Feb.
Article in English | MEDLINE | ID: mdl-1310192

ABSTRACT

The sequences of the four larger proteins of rotavirus group C (Cowden strain) are presented and compared with the sequences of the corresponding group A proteins. They exhibit a significant level of homology, allowing gene coding assignment for the group C rotavirus. The coding strategy of the group C virus RNA segment is the same as that for the group A large segments as one long open reading frame is present in each segment. The genome segment 1 encodes the structural protein VP1 which presents the RNA-dependent RNA polymerase consensus motifs. The VP1 protein is the most highly conserved between the rotaviruses of groups A and C. The genome segment 2 encodes the VP2 protein. The deduced protein sequence does not present the putative leucine zippers identified in the group A protein but its amino terminal is hydrophilic and highly charged as previously noted for the group A protein. The genome segment 3 encodes for a protein homologous to the group A outer capsid protein VP4. As observed among the various group A sequences, the amino terminal is the region presenting the fewest similarities. A cleavage region and a putative fusion motif similar to those present in the group A viruses have been identified. For this protein the comparison has been extended to the IDIRV [corrected] VP3 previously sequenced and indicates that groups A and C VP4 proteins are much more related to each other than to the group B equivalent. The genome segment 4 encodes for a protein showing an approximate 40% sequence identity to the minor core protein, VP3, of the group A rotavirus. This remarkable conservation of primary structures argues for severe functional constraint on the evolution of these proteins.


Subject(s)
Rotavirus/genetics , Viral Proteins/genetics , Amino Acid Sequence , Animals , Base Sequence , Capsid/genetics , Capsid/metabolism , Capsid Proteins , Cloning, Molecular , DNA, Viral , Guanosine Triphosphate/metabolism , Molecular Sequence Data , Rotavirus/classification , Sequence Alignment , Swine , Viral Core Proteins/genetics
20.
Can J Psychiatry ; 36(5): 317-22, 1991 Jun.
Article in English | MEDLINE | ID: mdl-1884331

ABSTRACT

This paper reports the results of what is believed to be the first systematic survey of the Canadian judiciary about work-related stress. County and District Court judges from four provinces who were attending an educational event on two successive years (N = 104) reported in writing, anonymously, their perceptions of the most stressful aspects of being a judge. A similar survey of their spouses (N = 48) added another perspective to the findings. The overwhelming majority of respondents reported aspects of the work itself (for example, sentencing, child custody cases, judgements, decision-making, and jury trials) as being their primary source of occupational stress. This is not in keeping with the results of most studies, which find that workers view job factors such as role conflict, employer/employee relationships, and career decisions as being more stressful than the actual work they perform. Qualitative material from individual and group interviews suggests that additional preparation and training for the bench and mechanisms for reducing isolation and improving communication might alleviate the stress experienced by judges, while helping them to cope more effectively with their increasingly complex and difficult roles.


Subject(s)
Criminal Law , Job Satisfaction , Occupational Diseases/psychology , Stress, Psychological/complications , Adult , Aged , Burnout, Professional/psychology , Female , Florida , Humans , Male , Middle Aged , Risk Factors , Social Environment
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