231 research outputs found
Spectrum of mitochondrial genomic variation and associated clinical presentation of prostate cancer in South African men
BACKGROUND : Prostate cancer incidence and mortality rates are significantly increased in
African–American men, but limited studies have been performed within Sub–Saharan
African populations. As mitochondria control energy metabolism and apoptosis we speculate
that somatic mutations within mitochondrial genomes are candidate drivers of aggressive
prostate carcinogenesis.
METHODS : We used matched blood and prostate tissue samples from 87 South African men
(77 with African ancestry) to perform deep sequencing of complete mitochondrial genomes.
Clinical presentation was biased toward aggressive disease (Gleason score >7, 64%), and
compared with men without prostate cancer either with or without benign prostatic hyperplasia.
RESULTS : We identified 144 somatic mtDNA single nucleotide variants (SNVs), of which 80
were observed in 39 men presenting with aggressive disease. Both the number and frequency
of somatic mtDNA SNVs were associated with higher pathological stage.
CONCLUSIONS : Besides doubling the total number of somatic PCa-associated mitochondrial
genome mutations identified to date, we associate mutational load with aggressive
prostate cancer status in men of African ancestry.NIH R21- CA170081, Australian Prostate Cancer Research Centre NSW, the J. Craig Venter Institute, the Garvan Institute, the Petre Foundation, Australia, the Cancer Association of South Africa (CANSA).http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-0045hb201
Peeling back the layers: Deconstructing information literacy discourse in higher education
The discourses of information literacy practice create epistemological assumptions about how the practice should happen, who should be responsible and under what conditions instruction should be given. Analysis of a wide range of documents and texts emerging from the Higher Education (HE) sector suggest that information literacy (IL) is shaped by two competing and incongruent narratives. The outward facing narrative of information literacy (located in information literacy standards and guidelines) positions information literacy as an empowering practice that arms students with the knowledge and skills to battle the complexity of the modern information world. In contrast, the inward facing narrative (located in information literacy texts) positions students as lacking appropriate knowledge, skills and agency. This deficit perception, which has the capacity to influence pedagogical practice, is at odds with constructivist and action-oriented views that are espoused within information literacy instructional pedagogy. This presentation represents the first paper in a research programme that interrogates the epistemological premises and discourses of information literacy within HE
Evaluation of two sets of immunohistochemical and Western blot confirmatory methods in the detection of typical and atypical BSE cases
<p>Abstract</p> <p>Background</p> <p>Three distinct forms of bovine spongiform encephalopathy (BSE), defined as classical (C-), low (L-) or high (H-) type, have been detected through ongoing active and passive surveillance systems for the disease.</p> <p>The aim of the present study was to compare the ability of two sets of immunohistochemical (IHC) and Western blot (WB) BSE confirmatory protocols to detect C- and atypical (L- and H-type) BSE forms.</p> <p>Obex samples from cases of United States and Italian C-type BSE, a U.S. H-type and an Italian L-type BSE case were tested in parallel using the two IHC sets and WB methods.</p> <p>Results</p> <p>The two IHC techniques proved equivalent in identifying and differentiating between C-type, L-type and H-type BSE. The IHC protocols appeared consistent in the identification of PrP<sup>Sc </sup>distribution and deposition patterns in relation to the BSE type examined. Both IHC methods evidenced three distinct PrP<sup>Sc </sup>phenotypes for each type of BSE: prevailing granular and linear tracts pattern in the C-type; intraglial and intraneuronal deposits in the H-type; plaques in the L-type.</p> <p>Also, the two techniques gave comparable results for PrP<sup>Sc </sup>staining intensity on the C- and L-type BSE samples, whereas a higher amount of intraglial and intraneuronal PrP<sup>Sc </sup>deposition on the H-type BSE case was revealed by the method based on a stronger demasking step.</p> <p>Both WB methods were consistent in identifying classical and atypical BSE forms and in differentiating the specific PrP<sup>Sc </sup>molecular weight and glycoform ratios of each form.</p> <p>Conclusions</p> <p>The study showed that the IHC and WB BSE confirmatory methods were equally able to recognize C-, L- and H-type BSE forms and to discriminate between their different immunohistochemical and molecular phenotypes. Of note is that for the first time one of the two sets of BSE confirmatory protocols proved effective in identifying the L-type BSE form. This finding helps to validate the suitability of the BSE confirmatory tests for BSE surveillance currently in place.</p
Soybean meal or cotton by-products associated with urea as source of nitrogen in the diet of lactating goats
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