8 research outputs found
Evidence for abundant transcription of non-coding regions in the Saccharomyces cerevisiae genome
Background: Recent studies in a growing number of organisms have yielded
accumulating evidence that a significant portion of the non-coding region in
the genome is transcribed. We address this issue in the yeast Saccharomyces
cerevisiae.
Results: Taking into account the absence of a significantly large yeast EST
database, we use microarray expression data collected for genomic regions
erroneously believed to be coding to study the expression pattern of non-coding
regions in the Saccharomyces cerevisiae genome. We find that at least 164 out
of 589 (28%) such regions are expressed under specific biological conditions.
In particular, looking at the probes that are located opposing other known
genes at the same genomic locus, we find that 88 out of 341 (26%) of these
genes support antisense transcription. The expression patterns of these
antisense genes are positively correlated. We validate these results using
RT-PCR on a sample of 6 non-coding transcripts.
Conclusions: 1. The yeast genome is transcribed on a scale larger than
previously assumed. 2. Correlated transcription of antisense genes is abundant
in the yeast genome. 3. Antisense genes in yeast are non-coding.Comment: Journal version available at
http://www.biomedcentral.com/1471-2164/6/93/abstrac
Superconductivity and Quantum Spin Disorder in Cuprates
A fundamental connection between superconductivity and quantum spin
fluctuations in underdoped cuprates, is revealed. A variational calculation
shows that {\em Cooper pair hopping} strongly reduces the local magnetization
. This effect pertains to recent neutron scattering and muon spin rotation
measurements in which varies weakly with hole doping in the poorly
conducting regime, but drops precipitously above the onset of
superconductivity
Toward earlier detection of choroidal neovascularization secondary to age-related macular degeneration: Multicenter evaluation of a preferential hyperacuity perimeter designed as a home device
Purpose: The primary purpose of this study was to evaluate the ability of a home device preferential hyperacuity perimeter to discriminate between patients with choroidal neovascularization (CNV) and intermediate age-related macular degeneration (AMD), and the secondary purpose was to investigate the dependence of sensitivity on lesion characteristics. Methods: All participants were tested with the home device in an unsupervised mode. The first part of this work was retrospective using tests performed by patients with intermediate AMD and newly diagnosed CNV. In the second part, the classifier was prospectively challenged with tests performed by patients with intermediate AMD and newly diagnosed CNV. The dependence of sensitivity on lesion characteristics was estimated with tests performed by patients with CNV of both parts. Results: In 66 eyes with CNV and 65 eyes with intermediate AMD, both sensitivity and specificity were 0.85. In the retrospective part (34 CNV and 43 intermediate AMD), sensitivity and specificity were 0.85 ± 0.12 (95% confidence interval) and 0.84 ± 0.11 (95% confidence interval), respectively. In the prospective part (32 CNV and 22 intermediate AMD), sensitivity and specificity were 0.84 ± 0.13 (95% confidence interval) and 0.86 ± 0.14 (95% confidence interval), respectively. Chi-square analysis showed no dependence of sensitivity on type (P = 0.44), location (P = 0.243), or size (P = 0.73) of the CNV lesions. Conclusion: A home device preferential hyperacuity perimeter has good sensitivity and specificity in discriminating between patients with newly diagnosed CNV and intermediate AMD. Sensitivity is not dependent on lesion characteristics. © The Ophthalmic Communications Society, Inc