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Adaptive potential of
Coffea canephora
from Uganda in response to climate change. Mol Ecol 2022; 31:1800-1819. [DOI: 10.1111/mec.16360] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 11/12/2021] [Accepted: 01/06/2022] [Indexed: 11/28/2022]
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A High-Throughput Molecular Pipeline Reveals the Diversity in Prevalence and Abundance of Pratylenchus and Meloidogyne Species in Coffee Plantations. PHYTOPATHOLOGY 2018; 108:641-650. [PMID: 29291356 DOI: 10.1094/phyto-10-17-0343-r] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Coffee yields are adversely affected by plant-parasitic nematodes and the pathogens are largely underreported because a simple and reliable identification method is not available. We describe a polymerase chain reaction-based approach to rapidly detect and quantify the major Pratylenchus and Meloidogyne nematode species that are capable of parasitizing coffee. The procedure was applied to soil samples obtained from a number of coffee farms in Brazil, Vietnam, and Indonesia to assess the prevalence of these species associated both with coffee (Coffea arabica and C. canephora) and its intercropped species Musa acuminata (banana) and Piper nigrum (black pepper). Pratylenchus coffeae and P. brachyurus were associated with coffee in all three countries but there were distinct profiles of Meloidogyne spp. Meloidogyne incognita, M. exigua, and M. paranaensis were identified in samples from Brazil and M. incognita and M. hapla were detected around the roots of coffee in Vietnam. No Meloidogyne spp. were detected in samples from Indonesia. There was a high abundance of Meloidogyne spp. in soil samples in which Pratylenchus spp. were low or not detected, suggesting that the success of one genus may deter another. Meloidogyne spp. in Vietnam and Pratylenchus spp. in Indonesia were more numerous around intercropped plants than in association with coffee. The data suggest a widespread but differential nematode problem associated with coffee production across the regions studied. The issue is compounded by the current choice of intercrops that support large nematode populations. Wider application of the approach would elucidate the true global scale of the nematode problem and the cost to coffee production. [Formula: see text] Copyright © 2018 The Author(s). This is an open access article distributed under the CC BY 4.0 International license .
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Overexpression of BdMATE Gene Improves Aluminum Tolerance in Setaria viridis. FRONTIERS IN PLANT SCIENCE 2017; 8:865. [PMID: 28642761 PMCID: PMC5462932 DOI: 10.3389/fpls.2017.00865] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Accepted: 05/09/2017] [Indexed: 05/02/2023]
Abstract
Acidic soils are distributed worldwide, predominantly in tropical and subtropical areas, reaching around 50% of the arable soil. This type of soil strongly reduces crop production, mainly because of the presence of aluminum, which has its solubility increased at low pH levels. A well-known physiological mechanism used by plants to cope with Al stress involves activation of membrane transporters responsible for organic acid anions secretion from the root apex to the rhizosphere, which chelate Al, preventing its absorption by roots. In sorghum, a membrane transporter gene belonging to multidrug and toxic compound extrusion (MATE) family was identified and characterized as an aluminum-activated citrate transporter gene responsible for Al tolerance in this crop. Setaria viridis is an emerging model for C4 species and it is an important model to validate some genes for further C4 crops transformation, such as sugarcane, maize, and wheat. In the present work, Setaria viridis was used as a model plant to overexpress a newly identified MATE gene from Brachypodium distachyon (BdMATE), closely related to SbMATE, for aluminum tolerance assays. Transgenic S. viridis plants overexpressing a BdMATE presented an improved Al tolerance phenotype, characterized by sustained root growth and exclusion of aluminum from the root apex in transgenic plants, as confirmed by hematoxylin assay. In addition, transgenic plants showed higher root citrate exudation into the rhizosphere, suggesting that Al tolerance improvement in these plants could be related to the chelation of the metal by the organic acid anion. These results suggest that BdMATE gene can be used to transform C4 crops of economic importance with improved aluminum tolerance.
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Abstract
Coffee is a valuable beverage crop due to its characteristic flavor, aroma, and the stimulating effects of caffeine. We generated a high-quality draft genome of the species Coffea canephora, which displays a conserved chromosomal gene order among asterid angiosperms. Although it shows no sign of the whole-genome triplication identified in Solanaceae species such as tomato, the genome includes several species-specific gene family expansions, among them N-methyltransferases (NMTs) involved in caffeine production, defense-related genes, and alkaloid and flavonoid enzymes involved in secondary compound synthesis. Comparative analyses of caffeine NMTs demonstrate that these genes expanded through sequential tandem duplications independently of genes from cacao and tea, suggesting that caffeine in eudicots is of polyphyletic origin.
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Lipid transfer proteins in coffee: isolation of Coffea orthologs, Coffea arabica homeologs, expression during coffee fruit development and promoter analysis in transgenic tobacco plants. PLANT MOLECULAR BIOLOGY 2014; 85:11-31. [PMID: 24469961 DOI: 10.1007/s11103-013-0166-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Accepted: 12/06/2013] [Indexed: 06/03/2023]
Abstract
The aim of the present study was to perform a genomic analysis of non-specific lipid-transfer proteins (nsLTPs) in coffee. Several nsLTPs-encoding cDNA and gene sequences were cloned from Coffea arabica and Coffea canephora species. In this work, their analyses revealed that coffee nsLTPs belong to Type II LTP characterized under their mature forms by a molecular weight of around 7.3 kDa, a basic isoelectric points of 8.5 and the presence of typical CXC pattern, with X being an hydrophobic residue facing towards the hydrophobic cavity. Even if several single nucleotide polymorphisms were identified in these nsLTP-coding sequences, 3D predictions showed that they do not have a significant impact on protein functions. Northern blot and RT-qPCR experiments revealed specific expression of Type II nsLTPs-encoding genes in coffee fruits, mainly during the early development of endosperm of both C. arabica and C. canephora. As part of our search for tissue-specific promoters in coffee, an nsLTP promoter region of around 1.2 kb was isolated. It contained several DNA repeats including boxes identified as essential for grain specific expression in other plants. The whole fragment, and a series of 5' deletions, were fused to the reporter gene β-glucuronidase (uidA) and analyzed in transgenic Nicotiana tabacum plants. Histochemical and fluorimetric GUS assays showed that the shorter (345 bp) and medium (827 bp) fragments of nsLTP promoter function as grain-specific promoters in transgenic tobacco plants.
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Identification of expressed sequences in the coffee genome potentially associated with somatic embryogenesis. GENETICS AND MOLECULAR RESEARCH 2013; 12:1698-709. [PMID: 23765976 DOI: 10.4238/2013.may.21.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Brazil possesses the most modern and productive coffee growing farms in the world, but technological development is desired to cope with the increasing world demand. One way to increase Brazilian coffee growing productivity is wide scale production of clones with superior genotypes, which can be obtained with in vitro propagation technique, or from tissue culture. These procedures can generate thousands of clones. However, the methodologies for in vitro cultivation are genotype-dependent, which leads to an almost empirical development of specific protocols for each species. Therefore, molecular markers linked to the biochemical events of somatic embryogenesis would greatly facilitate the development of such protocols. In this context, sequences potentially involved in embryogenesis processes in the coffee plant were identified in silico from libraries generated by the Brazilian Coffee Genome Project. Through these in silico analyses, we identified 15 EST-contigs related to the embryogenesis process. Among these, 5 EST-contigs (3605, 9850, 13686, 17240, and 17265) could readily be associated with plant embryogenesis. Sequence analysis of EST-contig 3605, 9850, and 17265 revealed similarity to a polygalacturonase, to a cysteine-proteinase, and to an allergenine, respectively. Results also show that EST-contig 17265 sequences presented similarity to an expansin. Finally, analysis of EST-contig 17240 revealed similarity to a protein of unknown function, but it grouped in the similarity dendrogram with the WUSCHEL transcription factor. The data suggest that these EST-contigs are related to the embryogenic process and have potential as molecular markers to increase methodological efficiency in obtaining coffee plant embryogenic materials.
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Construction and characterization of a BAC library from the Coffea arabica genotype Timor Hybrid CIFC 832/2. Genetica 2013; 141:217-26. [PMID: 23677718 DOI: 10.1007/s10709-013-9720-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Accepted: 05/02/2013] [Indexed: 10/26/2022]
Abstract
Most of the world's coffee production originates from Coffea arabica, an allotetraploid species with low genetic diversity and for which few genomic resources are available. Genomic libraries with large DNA fragment inserts are useful tools for the study of plant genomes, including the production of physical maps, integration studies of physical and genetic maps, genome structure analysis and gene isolation by positional cloning. Here, we report the construction and characterization of a Bacterial Artificial Chromosome (BAC) library from C. arabica Timor Hybrid CIFC 832/2, a parental genotype for several modern coffee cultivars. The BAC library consists of 56,832 clones with an average insert size of 118 kb, which represents a dihaploid genome coverage of five to sixfold. The content of organellar DNA was estimated at 1.04 and 0.5 % for chloroplast and mitochondrial DNA, respectively. The BAC library was screened for the NADPH-dependent mannose-6-phosphate reductase gene (CaM6PR) with markers positioned on four linkage groups of a partial C. arabica genetic map. A mixed approach using PCR and membrane hybridization of BAC pools allowed for the discovery of nine BAC clones with the CaM6PR gene and 53 BAC clones that were anchored to the genetic map with simple sequence repeat markers. This library will be a useful tool for future studies on comparative genomics and the identification of genes and regulatory elements controlling major traits in this economically important crop species.
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A minimal cytomegalovirus intron A variant can improve transgene expression in different mammalian cell lines. Biotechnol Lett 2012; 35:21-7. [PMID: 22955677 DOI: 10.1007/s10529-012-1043-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2012] [Accepted: 08/21/2012] [Indexed: 11/28/2022]
Abstract
The expression enhancement by cytomegalovirus promoter and different intron A (IA) variants were evaluated in CHO-K1, HepG2, HEK-293 and COS-7 cells by assessing the levels of luciferase activity. This data along with mRNA levels measurement indicated that the construct harboring an IA variant with a 200-nucleotide deletion (Δ200) had the greatest impact on increasing luciferase expression among all constructs evaluated. Based on these results, we redesigned pCMV-IA variants and cloned them into plasmids expressing a humanized antibody. These plasmids were then used to transfect CHO-K1 cells. Production of the antibody was not augmented with the Δ200 promoter variant. The 600-nucleotide deletion (Δ600) and whole IA promoter variants expressed similar levels of the recombinant protein. These data indicate that the IA-based enhanced expression of transgenes depends on a small region within the intron.
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Cervical cytological abnormalities and factors associated with high-grade squamous intraepithelial lesions among HIV-infected women from Rio de Janeiro, Brazil. Int J STD AIDS 2012; 23:12-7. [PMID: 22362681 DOI: 10.1258/ijsa.2009.009409] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Although cervical cancer remains a major public health problem in Brazil, knowledge of cervical cytological abnormalities among HIV-infected women remains scarce. At baseline evaluation of a cohort followed in Rio de Janeiro, Brazil, 703 HIV-infected women underwent cytology-based cervical cancer screening and human papillomavirus (HPV) DNA testing. Poisson regression analysis was used to evaluate the association of factors with the presence of high-grade squamous intraepithelial lesions (HSIL). Cervical cytology was abnormal in 24.3% of the women; 4.1% had HSIL. Beyond HPV infection, factors independently associated with the presence of HSIL was age (≥25 and ≤40 years, prevalence ratio [PR] 2.60, 95% confidence interval [CI] 1.11-6.10), and more than three pregnancies was protective (PR 0.33, 95% CI 0.11-0.94). High coverage of cervical cancer screening is warranted to prevent morbidity and mortality from cervical cancer in this population.
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Differentially expressed genes and proteins upon drought acclimation in tolerant and sensitive genotypes of Coffea canephora. JOURNAL OF EXPERIMENTAL BOTANY 2012; 63:4191-212. [PMID: 22511801 PMCID: PMC3398449 DOI: 10.1093/jxb/ers103] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The aim of this study was to investigate the molecular mechanisms underlying drought acclimation in coffee plants by the identification of candidate genes (CGs) using different approaches. The first approach used the data generated during the Brazilian Coffee expressed sequence tag (EST) project to select 13 CGs by an in silico analysis (electronic northern). The second approach was based on screening macroarrays spotted with plasmid DNA (coffee ESTs) with separate hybridizations using leaf cDNA probes from drought-tolerant and susceptible clones of Coffea canephora var. Conilon, grown under different water regimes. This allowed the isolation of seven additional CGs. The third approach used two-dimensional gel electrophoresis to identify proteins displaying differential accumulation in leaves of drought-tolerant and susceptible clones of C. canephora. Six of them were characterized by MALDI-TOF-MS/MS (matrix-assisted laser desorption-time of flight-tandem mass spectrometry) and the corresponding proteins were identified. Finally, additional CGs were selected from the literature, and quantitative real-time polymerase chain reaction (qPCR) was performed to analyse the expression of all identified CGs. Altogether, >40 genes presenting differential gene expression during drought acclimation were identified, some of them showing different expression profiles between drought-tolerant and susceptible clones. Based on the obtained results, it can be concluded that factors involved a complex network of responses probably involving the abscisic signalling pathway and nitric oxide are major molecular determinants that might explain the better efficiency in controlling stomata closure and transpiration displayed by drought-tolerant clones of C. canephora.
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Low CXCL13 expression, splenic lymphoid tissue atrophy and germinal center disruption in severe canine visceral leishmaniasis. PLoS One 2012; 7:e29103. [PMID: 22242159 PMCID: PMC3252310 DOI: 10.1371/journal.pone.0029103] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2011] [Accepted: 11/21/2011] [Indexed: 11/29/2022] Open
Abstract
Visceral leishmaniasis is associated with atrophy and histological disorganization of splenic compartments. In this paper, we compared organized and disorganized splenic lymphoid tissue from dogs naturally infected with Leishmania infantum assessing the size of the white pulp compartments, the distribution of T, B and S100+ dendritic cells, using immunohistochemistry and morphometry and the expression of CCR7 and the cytokines, CXCL13, lymphotoxin (LT)-α, LT-β, CCL19, CCL21, TNF-α, IL-10, IFN-γ and TGF-β, using by real time RT-PCR. The lymphoid follicles and marginal zones were smaller (3.2 and 1.9 times, respectively; Mann-Whitney, P<0.02) in animals with disorganized splenic tissue in comparison to those with organized splenic lymphoid tissue. In spleens with disorganized lymphoid tissue, the numbers of T cells and S100+ dendritic cells were decreased in the follicles, and the numbers of B cells were reduced in both the follicles and marginal zones. CXCL13 mRNA expression was lower in animals with disorganized lymphoid tissue (0.5±0.4) compared to those with organized lymphoid tissue (2.7±2.9, both relative to 18S expression, P = 0.01). These changes in the spleen were associated with higher frequency of severe disease (7/12) in the animals with disorganized than in animals with organized (2/13, Chi-square, P = 0.01) splenic lymphoid tissue. The data presented herein suggest that natural infection with Leishmania infantum is associated with the impairment of follicular dendritic cells, CXCL13 expression, B cell migration and germinal center formation and associates these changes with severe clinical forms of visceral leishmaniasis. Furthermore the fact that this work uses dogs naturally infected with Leishmania infantum emphasizes the relevance of the data presented herein for the knowledge on the canine and human visceral leishmaniasis.
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RBCS1 expression in coffee: Coffea orthologs, Coffea arabica homeologs, and expression variability between genotypes and under drought stress. BMC PLANT BIOLOGY 2011; 11:85. [PMID: 21575242 PMCID: PMC3121667 DOI: 10.1186/1471-2229-11-85] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2011] [Accepted: 05/16/2011] [Indexed: 05/08/2023]
Abstract
BACKGROUND In higher plants, the inhibition of photosynthetic capacity under drought is attributable to stomatal and non-stomatal (i.e., photochemical and biochemical) effects. In particular, a disruption of photosynthetic metabolism and Rubisco regulation can be observed. Several studies reported reduced expression of the RBCS genes, which encode the Rubisco small subunit, under water stress. RESULTS Expression of the RBCS1 gene was analysed in the allopolyploid context of C. arabica, which originates from a natural cross between the C. canephora and C. eugenioides species. Our study revealed the existence of two homeologous RBCS1 genes in C. arabica: one carried by the C. canephora sub-genome (called CaCc) and the other carried by the C. eugenioides sub-genome (called CaCe). Using specific primer pairs for each homeolog, expression studies revealed that CaCe was expressed in C. eugenioides and C. arabica but was undetectable in C. canephora. On the other hand, CaCc was expressed in C. canephora but almost completely silenced in non-introgressed ("pure") genotypes of C. arabica. However, enhanced CaCc expression was observed in most C. arabica cultivars with introgressed C. canephora genome. In addition, total RBCS1 expression was higher for C. arabica cultivars that had recently introgressed C. canephora genome than for "pure" cultivars. For both species, water stress led to an important decrease in the abundance of RBCS1 transcripts. This was observed for plants grown in either greenhouse or field conditions under severe or moderate drought. However, this reduction of RBCS1 gene expression was not accompanied by a decrease in the corresponding protein in the leaves of C. canephora subjected to water withdrawal. In that case, the amount of RBCS1 was even higher under drought than under unstressed (irrigated) conditions, which suggests great stability of RBCS1 under adverse water conditions. On the other hand, for C. arabica, high nocturnal expression of RBCS1 could also explain the accumulation of the RBCS1 protein under water stress. Altogether, the results presented here suggest that the content of RBCS was not responsible for the loss of photosynthetic capacity that is commonly observed in water-stressed coffee plants. CONCLUSION We showed that the CaCe homeolog was expressed in C. eugenioides and non-introgressed ("pure") genotypes of C. arabica but that it was undetectable in C. canephora. On the other hand, the CaCc homeolog was expressed in C. canephora but highly repressed in C. arabica. Expression of the CaCc homeolog was enhanced in C. arabica cultivars that experienced recent introgression with C. canephora. For both C. canephora and C. arabica species, total RBCS1 gene expression was highly reduced with WS. Unexpectedly, the accumulation of RBCS1 protein was observed in the leaves of C. canephora under WS, possibly coming from nocturnal RBCS1 expression. These results suggest that the increase in the amount of RBCS1 protein could contribute to the antioxidative function of photorespiration in water-stressed coffee plants.
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An EST-based analysis identifies new genes and reveals distinctive gene expression features of Coffea arabica and Coffea canephora. BMC PLANT BIOLOGY 2011; 11:30. [PMID: 21303543 PMCID: PMC3045888 DOI: 10.1186/1471-2229-11-30] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2010] [Accepted: 02/08/2011] [Indexed: 05/10/2023]
Abstract
BACKGROUND Coffee is one of the world's most important crops; it is consumed worldwide and plays a significant role in the economy of producing countries. Coffea arabica and C. canephora are responsible for 70 and 30% of commercial production, respectively. C. arabica is an allotetraploid from a recent hybridization of the diploid species, C. canephora and C. eugenioides. C. arabica has lower genetic diversity and results in a higher quality beverage than C. canephora. Research initiatives have been launched to produce genomic and transcriptomic data about Coffea spp. as a strategy to improve breeding efficiency. RESULTS Assembling the expressed sequence tags (ESTs) of C. arabica and C. canephora produced by the Brazilian Coffee Genome Project and the Nestlé-Cornell Consortium revealed 32,007 clusters of C. arabica and 16,665 clusters of C. canephora. We detected different GC3 profiles between these species that are related to their genome structure and mating system. BLAST analysis revealed similarities between coffee and grape (Vitis vinifera) genes. Using KA/KS analysis, we identified coffee genes under purifying and positive selection. Protein domain and gene ontology analyses suggested differences between Coffea spp. data, mainly in relation to complex sugar synthases and nucleotide binding proteins. OrthoMCL was used to identify specific and prevalent coffee protein families when compared to five other plant species. Among the interesting families annotated are new cystatins, glycine-rich proteins and RALF-like peptides. Hierarchical clustering was used to independently group C. arabica and C. canephora expression clusters according to expression data extracted from EST libraries, resulting in the identification of differentially expressed genes. Based on these results, we emphasize gene annotation and discuss plant defenses, abiotic stress and cup quality-related functional categories. CONCLUSION We present the first comprehensive genome-wide transcript profile study of C. arabica and C. canephora, which can be freely assessed by the scientific community at http://www.lge.ibi.unicamp.br/coffea. Our data reveal the presence of species-specific/prevalent genes in coffee that may help to explain particular characteristics of these two crops. The identification of differentially expressed transcripts offers a starting point for the correlation between gene expression profiles and Coffea spp. developmental traits, providing valuable insights for coffee breeding and biotechnology, especially concerning sugar metabolism and stress tolerance.
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Post-secretory events alter the peptide content of the skin secretion of Hypsiboas raniceps. Biochem Biophys Res Commun 2008; 377:1057-61. [PMID: 18976634 DOI: 10.1016/j.bbrc.2008.10.102] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2008] [Accepted: 10/16/2008] [Indexed: 01/02/2023]
Abstract
A novel family of antimicrobial peptides, named raniseptins, has been characterized from the skin secretion of the anuran Hypsiboas raniceps. Nine cDNA molecules have been successfully cloned, sequenced, and their respective polypeptides were characterized by mass spectrometry and Edman degradation. The encoded precursors share structural similarities with the dermaseptin prepropeptides from the Phyllomedusinae subfamily and the mature 28-29 residue long peptides undergo further proteolytic cleavage in the crude secretion yielding consistent fragments of 14-15 residues. The biological assays performed demonstrated that the Rsp-1 peptide has antimicrobial activity against different bacterial strains without significant lytic effect against human erythrocytes, whereas the peptide fragments generated by endoproteolysis show limited antibiotic potency. MALDI imaging mass spectrometry in situ studies have demonstrated that the mature raniseptin peptides are in fact secreted as intact molecules within a defined glandular domain of the dorsal skin, challenging the physiological role of the observed raniseptin fragments, identified only as part of the crude secretion. In this sense, stored and secreted antimicrobial peptides may confer distinct protective roles to the frog.
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Spidroins from the Brazilian spider Nephilengys cruentata (Araneae: Nephilidae). Comp Biochem Physiol B Biochem Mol Biol 2007; 147:597-606. [PMID: 17490908 DOI: 10.1016/j.cbpb.2007.03.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2007] [Revised: 03/28/2007] [Accepted: 03/31/2007] [Indexed: 10/23/2022]
Abstract
Spiders produce up to six different kinds of silk, each one for a specific biological function. Spider silks are also known for their unique mechanical properties. The possibility of producing new materials with similar properties motivated research on these silk proteins (spidroins). Using expression sequence tags, we identified four spidroins produced by major ampullate, minor ampullate, flagelliform and tubuliform silk glands from the Brazilian spider Nephilengys cruentata (Araneae: Nephilidae). The new protein sequences showed substantial similarity to other spidroins previously described, with high content of alanine and glycine due to the presence of the highly repetitive motifs (polyAla, (GA)n, (GGX)n, (GPGGX)n). Similarities among sequences were also observed between the different spidroins with the exception of tubuliform spidroin, which presents a unique complex amino acid sequence with high amounts of serine and low amounts of glycine.
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Novel dermaseptins from Phyllomedusa hypochondrialis (Amphibia). Biochem Biophys Res Commun 2006; 347:739-46. [PMID: 16844081 DOI: 10.1016/j.bbrc.2006.06.168] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2006] [Accepted: 06/27/2006] [Indexed: 11/22/2022]
Abstract
Six new antimicrobial peptides structurally related to the dermaseptin family have been isolated from the skin secretion of the amphibian Phyllomedusa hypochondrialis. The primary structures of these molecules named as DShypo 01, 02, 03, 04, 06, and 07 were determined by de novo MS/MS experiments, Edman degradation, and cDNA sequencing. The fifth peptide was found to be precisely the same DS 01 from Phyllomedusa oreades previously described by our group. The majority of the peptides purified from the crude skin secretion could be directly localized and mapped onto a freshly dissected dorsal skin fragment using mass spectrometry-imaging techniques. Comparisons between peptides and commercial drugs on their antibacterial and anti-Leishmania amazonensis efficiencies, associated with peptide lytic effects on mammalian blood cells and surface plasmon resonance interaction studies on immobilized DMPC vesicles, were also performed.
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Impact of fungal drug transporters on fungicide sensitivity, multidrug resistance and virulence. PEST MANAGEMENT SCIENCE 2006; 62:195-207. [PMID: 16475240 DOI: 10.1002/ps.1150] [Citation(s) in RCA: 118] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Drug transporters are membrane proteins that provide protection for organisms against natural toxic products and fungicides. In plant pathogens, drug transporters function in baseline sensitivity to fungicides, multidrug resistance (MDR) and virulence on host plants. This paper describes drug transporters of the filamentous fungi Aspergillus nidulans (Eidam) Winter, Botrytis cinerea Pers and Mycosphaerella graminicola (Fückel) Schroter that function in fungicide sensitivity and resistance. The fungi possess ATP-binding cassette (ABC) drug transporters that mediate MDR to fungicides in laboratory mutants. Similar mutants are not pronounced in field resistance to most classes of fungicide but may play a role in resistance to azoles. MDR may also explain historical cases of resistance to aromatic hydrocarbon fungicides and dodine. In clinical situations, MDR development in Candida albicans (Robin) Berkhout mediated by ABC transporters in patients suffering from candidiasis is common after prolonged treatment with azoles. Factors that can explain this striking difference between agricultural and clinical situations are discussed. Attention is also paid to the risk of MDR development in plant pathogens in the future. Finally, the paper describes the impact of fungal drug transporters on drug discovery.
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Construction and characterization of a Coffea canephora BAC library to study the organization of sucrose biosynthesis genes. TAG. THEORETICAL AND APPLIED GENETICS. THEORETISCHE UND ANGEWANDTE GENETIK 2005; 111:1032-41. [PMID: 16133319 DOI: 10.1007/s00122-005-0018-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2005] [Accepted: 06/14/2005] [Indexed: 05/04/2023]
Abstract
The first bacterial artificial chromosome (BAC) library of Robusta coffee (Coffea canephora) was constructed, with the aim of developing molecular resources to study the genome structure and evolution of this perennial crop. Clone 126, which is highly productive and confers good technological and organoleptic qualities of beverage, was chosen for development of this library. The BAC library contains 55,296 clones, with an average insert size of 135 Kb per plasmid, therefore representing theoretically nine haploid genome equivalents of C. canephora. Its validation was achieved with a set of 13 genetically anchored single-copy and 4 duplicated RFLP probes and yielded on average 9 BAC clones per probe. Screening of this BAC library was also carried out with partial cDNA probes coding for enzymes of sugar metabolism like invertases and sucrose synthase, with the aim of characterizing the organization and promoter structure of this important class of genes. It was shown that genes for both cell wall and vacuolar forms of invertases were probably unique in the Robusta genome whereas sucrose synthase was encoded by at least two genes. One of them (CcSUS1) was cloned and sequenced, showing that our BAC library is a valuable tool to rapidly identify genes of agronomic interest or linked to cup quality in C. canephora.
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Histoplasmosis as a late infectious complication following heart transplantation in a patient with Chagas' disease. Arq Bras Cardiol 2001; 76:403-8. [PMID: 11359189 DOI: 10.1590/s0066-782x2001000500007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Infectious complications following heart transplantation are an important cause of morbidity and mortality. Generally, bacterial infections are predominant; however, fungal infections can be responsible for up to 25% of infectious events. We report the case of a patient who presented with histoplasmosis as an infectious complication five years after heart transplantation due to a chagasic cardiopathy. This association has rarely been reported in the international literature.
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[The Delegation of the Current Professional Group of Young European Physicians (PWG) in the Committee for Surgery of the European Union of Specialists (UEMS)]. Chirurg 2000; 71:suppl 245-6. [PMID: 11043145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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The ABC transporter AtrB from Aspergillus nidulans mediates resistance to all major classes of fungicides and some natural toxic compounds. MICROBIOLOGY (READING, ENGLAND) 2000; 146 ( Pt 8):1987-1997. [PMID: 10931903 DOI: 10.1099/00221287-146-8-1987] [Citation(s) in RCA: 106] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This paper reports the functional characterization of AtrBp, an ABC transporter from Aspergillus nidulans. AtrBp is a multidrug transporter and has affinity to substrates belonging to all major classes of agricultural fungicides and some natural toxic compounds. The substrate profile of AtrBp was determined by assessing the sensitivity of deletion and overexpression mutants of atrB to several toxicants. All mutants showed normal growth as compared to control isolates. DeltaatrB mutants displayed increased sensitivity to anilinopyrimidine, benzimidazole, phenylpyrrole, phenylpyridylamine, strobirulin and some azole fungicides. Increased sensitivity to the natural toxic compounds camptothecin (alkaloid), the phytoalexin resveratrol (stilbene) and the mutagen 4-nitroquinoline oxide was also found. Overexpression mutants were less sensitive to a wide range of chemicals. In addition to the compounds mentioned above, decreased sensitivity to a broader range of azoles, dicarboximides, quintozene, acriflavine and rhodamine 6G was observed. Decreased sensitivity in overexpression mutants negatively correlated with levels of atrB expression. Interestingly, the overexpression mutants displayed increased sensitivity to dithiocarbamate fungicides, chlorothalonil and the iron-activated antibiotic phleomycin. Accumulation of the azole fungicide [(14)C]fenarimol by the overexpression mutants was lower as compared to the parental isolate, demonstrating that AtrBp acts by preventing intracellular accumulation of the toxicant. Various metabolic inhibitors increased accumulation levels of [(14)C]fenarimol in the overexpression mutants to wild-type levels, indicating that reduced accumulation of the fungicide in these mutants is due to increased energy-dependent efflux as a result of higher pump capacity of AtrBp.
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The role of ABC transporters from Aspergillus nidulans in protection against cytotoxic agents and in antibiotic production. MOLECULAR & GENERAL GENETICS : MGG 2000; 263:966-77. [PMID: 10954082 DOI: 10.1007/pl00008697] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This paper describes the characterization of atrC and atrD (ABC transporters C and D), two novel ABC transporter-encoding genes from the filamentous fungus Aspergillus nidulans, and provides evidence for the involvement of atrD in multidrug transport and antibiotic production. BLAST analysis of the deduced amino acid sequences of AtrCp and AtrDp reveals high homology to ABC transporter proteins of the P-glycoprotein cluster. AtrDp shows a particularly high degree of identity to the amino acid sequence of Afu Mdr1p, a previously characterized ABC transporter from the human pathogen A. fumigatus. Northern analysis demonstrates an increase in transcript levels of atrC and atrD in fungal germlings upon treatment with natural toxic compounds and xenobiotics. The atrC gene has a high constitutive level of expression relative to attrD, which suggests its involvement in a metabolic function. Single knock-out mutants for atrC and atrD were generated by gene replacement using pyrG from A. oryzae as a selectable marker. DeltatrD mutants display a hypersensitive phenotype to compounds such as cycloheximide, the cyclosporin derivative PSC 833, nigericin and valinomycin, indicating that AtrDp is involved in protection against cytotoxic compounds. Energy-dependent efflux of the azole-related fungicide fenarimol is inhibited by substrates of AtrDp (e.g. PSC 833, nigericin and valinomycin), suggesting that AtrDp plays a role in efflux of this fungicide. Most interestingly, (delta)atrD mutants display a decrease in penicillin production, measured indirectly as antimicrobial activity against Micrococcus luteus. These results suggest that ABC transporters may be involved in secretion of penicillin from fungal cells.
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MESH Headings
- ATP Binding Cassette Transporter, Subfamily B, Member 1/genetics
- ATP-Binding Cassette Transporters/genetics
- Amino Acid Sequence
- Anti-Bacterial Agents/metabolism
- Aspergillus nidulans/drug effects
- Aspergillus nidulans/genetics
- Biological Transport, Active
- Conserved Sequence
- Cyclosporins/pharmacology
- Drug Resistance, Multiple/genetics
- Fungal Proteins/genetics
- Fungicides, Industrial/metabolism
- Gene Expression Regulation, Fungal
- Genes, Fungal
- Genomic Library
- Ionophores/pharmacology
- Molecular Sequence Data
- Nigericin/pharmacology
- Pyrimidines/metabolism
- Restriction Mapping
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Transcription, Genetic
- Valinomycin/pharmacology
- Xenobiotics/pharmacology
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Electrocardiographic changes during low-dose, short-term therapy of cutaneous leishmaniasis with the pentavalent antimonial meglumine. Braz J Med Biol Res 1999; 32:297-301. [PMID: 10347787 DOI: 10.1590/s0100-879x1999000300008] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The pentavalent antimonial (Sb5+) meglumine is the drug of choice for the treatment of cutaneous leishmaniasis (CL) in Brazil. Although the cardiotoxicity of high-dose, long-term Sb5+ therapy is well known, the use of low-dose, short-term meglumine has been considered to be safe and relatively free from significant cardiac effects. In order to investigate the cardiotoxicity of low-dose, short-term therapy with meglumine in cutaneous leishmaniasis, 62 CL patients treated with meglumine were studied. A standard ECG was obtained before and immediately after the first cycle of treatment (15 mg Sb5+ kg-1 day-1). The electrocardiographic interpretation was carried out blindly by two investigators using the Minnesota Code. There were no significant differences in qualitative ECG variables before and after meglumine treatment. However, the corrected QT interval was clearly prolonged after antimonial therapy (420.0 vs 429.3 ms, P < 10(-6)). QTc augmentation exceeded 40 ms in 12 patients, 7 of whom developed marked QTc interval enlargement (500 ms) after meglumine therapy. This previously unrecognized cardiac toxicity induced by short-term, low-dose antimonial therapy has potentially important clinical implications. Since sudden death has been related to QTc prolongation over 500 ms induced by high-dose antimonial therapy, routine electrocardiographic monitoring is probably indicated even in CL patients treated with short-term, low-dose meglumine schedules. Until further studies are conducted to establish the interactions between pentavalent antimonials and other drugs, special care is recommended when using meglumine in combination with other medications, in particular with drugs that also increase the QTc interval.
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Glycoconjugates isolated from Trypanosoma cruzi but not from Leishmania species membranes trigger nitric oxide synthesis as well as microbicidal activity in IFN-gamma-primed macrophages. THE JOURNAL OF IMMUNOLOGY 1997. [DOI: 10.4049/jimmunol.159.12.6131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
In the present study, we investigated the role of glycosylphosphatidylinositol-anchored mucin-like glycoproteins (GPI-mucins) from Trypanosoma cruzi trypomastigotes in triggering the synthesis of nitric oxide as well as the microbicidal activity in murine macrophages. Our results show that GPI-mucins isolated from trypomastigote membranes are potent inducers of nitric oxide synthesis by IFN-gamma-primed macrophages, even at concentrations as low as 10 ng/ml. Our data also indicate the important role of glycosylphosphatidylinositol anchors from GPI-mucins as the second signal responsible for induction of nitric oxide synthesis by macrophages. To further investigate the role of these parasite molecules in inducing parasiticidal function, we cultured macrophages in the presence or absence of trypomastigote GPI-mucins and/or IFN-gamma and then infected these cells with either Leishmania spp. or T. cruzi. IFN-gamma was sufficient to induce microbial activity in macrophages infected with T. cruzi trypomastigotes. In contrast, killing of different species of Leishmania was further enhanced when macrophages exposed to IFN-gamma were also costimulated with trypomastigote-derived GPI-mucins. Our results also indicate that different glycolipids obtained from Leishmania major or Leishmania donovani (i.e., lipophosphoglycans or glycoinositolphospholipids) were unable to potentiate nitric oxide synthesis and/or microbicidal activity displayed by IFN-gamma-primed macrophages.
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Glycoconjugates isolated from Trypanosoma cruzi but not from Leishmania species membranes trigger nitric oxide synthesis as well as microbicidal activity in IFN-gamma-primed macrophages. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1997; 159:6131-9. [PMID: 9550414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
In the present study, we investigated the role of glycosylphosphatidylinositol-anchored mucin-like glycoproteins (GPI-mucins) from Trypanosoma cruzi trypomastigotes in triggering the synthesis of nitric oxide as well as the microbicidal activity in murine macrophages. Our results show that GPI-mucins isolated from trypomastigote membranes are potent inducers of nitric oxide synthesis by IFN-gamma-primed macrophages, even at concentrations as low as 10 ng/ml. Our data also indicate the important role of glycosylphosphatidylinositol anchors from GPI-mucins as the second signal responsible for induction of nitric oxide synthesis by macrophages. To further investigate the role of these parasite molecules in inducing parasiticidal function, we cultured macrophages in the presence or absence of trypomastigote GPI-mucins and/or IFN-gamma and then infected these cells with either Leishmania spp. or T. cruzi. IFN-gamma was sufficient to induce microbial activity in macrophages infected with T. cruzi trypomastigotes. In contrast, killing of different species of Leishmania was further enhanced when macrophages exposed to IFN-gamma were also costimulated with trypomastigote-derived GPI-mucins. Our results also indicate that different glycolipids obtained from Leishmania major or Leishmania donovani (i.e., lipophosphoglycans or glycoinositolphospholipids) were unable to potentiate nitric oxide synthesis and/or microbicidal activity displayed by IFN-gamma-primed macrophages.
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Multidrug resistance in Aspergillus nidulans involves novel ATP-binding cassette transporters. MOLECULAR & GENERAL GENETICS : MGG 1997; 254:417-26. [PMID: 9180695 DOI: 10.1007/s004380050434] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Two single-copy genes, designated atrA and atrB (ATP-binding cassette transporter A and B), were cloned from the filamentous fungus Aspergillus nidulans and sequenced. Based on the presence of conserved motifs and on hydropathy analysis, the products encoded by atrA and atrB can be regarded as novel members of the ATP-binding cassette (ABC) superfamily of membrane transporters. Both products share the same topology as the ABC transporters PDR5 and SNQ2 from Saccharomyces cerevisiae and CDR1 from Candida albicans, which are involved in multidrug resistance of these yeasts. Significant homology also occurs between the ATP-binding cassettes of AtrA and AtrB, and those of mammalian ABC transporters (P-glycoproteins). The transcription of atrA and, in particular, atrB in mycelium of A. nidulans is strongly enhanced by treatment with several drugs, including antibiotics, azole fungicides and plant defense toxins. The enhanced transcription is detectable within a few minutes after drug treatment and coincides with the beginning of energy-dependent drug efflux activity, reported previously in the fungus for azole fungicides. Transcription of the atr genes has been studied in a wild-type and in a series of isogenic strains carrying the imaA and/or imaB genes, which confer multidrug resistance to various toxic compounds such as the azole fungicide imazalil. atrB is constitutively transcribed at a low level in the wild-type and in strains carrying imaA or imaB. Imazalil treatment enhances transcription of atrB to a similar extent in all strains tested. atrA, unlike atrB, displays a relatively high level of constitutive expression in mutants carrying imaB. Imazalil enhances transcription of atrA more strongly in imaB mutants, suggesting that the imaB locus regulates atrA. Functional analysis demonstrated that cDNA of atrB can complement the drug hypersensitivity associated with PDR5 deficiency in S. cerevisiae.
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[A canine survey in a recent focus of cutaneous leishmaniasis in the city of Sabará, the metropolitan area of Belo Horizonte]. Rev Soc Bras Med Trop 1996; 29:323-9. [PMID: 8768580 DOI: 10.1590/s0037-86821996000400003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
In 1992, a dog naturally infected with Leishmania was found in a periurban area of Sabará, state of Minas Gerais, where human cutaneous leishmaniasis had been previously described. The parasite was classified as Leishmania, subgenus Viannia, which L. braziliensis, the main species of parasite present in the southeast Brazil, also belongs. In order to assess the importance of the dog in the transmission cycle of the disease, a canine survey was undertaken. Six hundred thirty-one dogs were examined and the prevalence of seropositive dogs for crude Leishmania amazonensis antigen was 3.2%. The presence of infected people and seropositive dogs either near or in the same house was observed. This fact suggests some transmission in the domiciliary environment, with the dogs being a risk factor for human infection in that periurban area. In the other hand, the low percentage of seropositive dogs points towards a secondary importance of these animals in the transmission of Leishmaniasis in that recent focus of the disease.
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Behavior therapy for transsexualism. Indian J Psychiatry 1995; 37:148-50. [PMID: 21743738 PMCID: PMC2971501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Transsexualism is a rare disorder, and there is little literature available on its treatment. A case is presented of transsexualism with homosexual orientation in a 24 year old male. Since the disorder appeared to have behavioral antecedents, it was treated with a behavior therapy package comprising relaxation, aversion therapy with aversion relief, modelling, hypnosis, orgasmic reconditioning, behavioral counselling and sex education. Therapy resulted in normalization of gender identity, but the homosexual orientation persisted.
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Effect of negative ion atmospheric loading on cognitive performance in human volunteers. Indian J Psychiatry 1992; 34:253-9. [PMID: 21776128 PMCID: PMC2982078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Negative ion atmospheric loading has been reported to affect a range of psychological functions, from alertness to circadian rhythms, and has been suggested to benefit a variety of medical conditions, from allergies to migraine. In a double-blind study planned to assess the effect of negative ions on cognitive performance in human volunteers, 65 female graduate course students were randomized into ionized atmosphere (n = 34) and control (n = 31) groups. The following cognitive tasks were administered: Digit Symbol Substitution Test, Addition Test, Visual Memory (Complex Figure) Test, Verbal Memeory (Complex Passage) Test, Ideational Fluency Test and Clerical Speed and Accuracy test. On all but the last two tests, the negative ion groupperfonned significantly better (to a 15-40% extent) than controls. It is concluded that negative ionization of the atmosphere by artificial means may be of benefit in certain common, practical situation in which depletion of these ions occurs.
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30
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Meditation from an Indian perspective. Indian J Psychiatry 1991; 33:293. [PMID: 21897474 PMCID: PMC2988316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
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Meditation versus medication. Indian J Psychiatry 1991; 33:39-43. [PMID: 21897460 PMCID: PMC2988294] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/29/2022] Open
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True hallucinations in non-psychotic states. CANADIAN JOURNAL OF PSYCHIATRY. REVUE CANADIENNE DE PSYCHIATRIE 1989; 34:704-6. [PMID: 2804881 DOI: 10.1177/070674378903400714] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
While hallucinations are known to occur as conversion symptoms in non-psychotic psychiatric states such as hysteria and grief, there is a lack of distinction between true and pseudo-hallucinations in such cases. We discuss the rationale which has necessitated this distinction, affirm that true hallucinations can occur in non-psychotic states, discuss the characteristics of such hallucinations, and postulate certain factors which may lead to hallucinations in non-psychotic states being judged as "true."
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Abstract
Earlier, we reported that true hallucinations may present as a conversion symptom. We here reiterate this and suggest that cultural sanction may be one factor that can lead to hallucinations being classified as true in non-psychotic psychiatric states.
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