MECHANISM OF DNA DAMAGE ASSOSCIATED WITH ESTROGEN RECEPTOR ALPHA – INTERPLAY OF NON-CANONICAL DNA SECONDARY STRUCTURES

Breast cancer is the second leading cause of cancer mortality among women. Many risk factors for breast cancer are related to estrogen exposure and high serum estrogen levels. Studies have demonstrated the critical role of estrogen in breast carcinogenesis, but less clear how estrogen acts as an initiator of carcinogenesis. Studies have also suggested associations between exposures to endocrine disrupting chemicals may also increase risk of breast cancer. Endocrine disrupting chemicals or xenoestrogens can mimic the effects of estrogen by binding with the receptors and alter the endocrine system. However, there is a lack of detailed mechanistic understanding. The focus of our first study is to investigate the effects of two xenoestrogens – Benophenone-3 (BP-3) and Propyl Paraben (PP) in the breast epithelial cells at concentrations relevant to human exposures and are commonly found in cosmetics, personal care products and sunscreens. While all women are exposed to endogenous and exogenous estrogens, only 1 in 8 women are expected to develop breast cancer suggesting that the cancer-promoting effects of estrogen exposure vary among individuals. Our study demonstrated that E2-induced DNA damage is most pronounced in rodents that are genetically susceptible to mammary tumors and among women who are at high risk of breast cancer. We also found increased E2-induced DNA damage in human breast tissues from women with inherited breast cancer risk alleles affecting DNA double-strand break repair. Our data demonstrate genetic differences in sensitivity to E2-stimulated DNA damage in rodents and that similar variation is observed in normal breast tissues from women. Lastly, we investigated the mechanism by which E2 and BP-3 induce DNA damage in breast cancer cell lines. We showed that treatment with E2 and BP-3 promotes another non-canonical DNA secondary structure called G quadruplexes (G4s) in ER+ breast cancer cells. The induction of G4 formation and DNA damage with E2 and BP-3 in breast cancer cells is mediated by reactive oxygen species (ROS). Therefore, our data suggest a mechanism in which E2 and BP3 induce R loop stabilization is dependent on ROS which contributes to the formation of DNA G4s and colocalize with sites of DNA damage

プロトン伝導性リン酸塩ガラスの熱安定性とプロトン移動度への条件付きガラス形成酸化物WO3, Ga2O3, およびV2O5添加の効果

othe

System Identification of a Micro Aerial Vehicle

The purpose of this thesis was to implement an Model Predictive Control based system identification method on a micro-aerial vehicle (DJI Matrice 100) as outlined in a study performed by ETH Zurich. Through limited test flights, data was obtained that allowed for the generation of first and second order system models. The first order models were robust, but the second order model fell short due to the fact that the data used for the model was not sufficient

プロトン伝導性リン酸塩ガラスの熱安定性とプロトン移動度への条件付きガラス形成酸化物WO3, Ga2O3, およびV2O5添加の効果

Tohoku University博士（学術）thesi

Document Management System

The debate of using paper documents over computer documents has been a long topic of interest, there has been a lot of research done on the topic. Also, experiments have been done to evaluate the performance of users working with computers v/s working manually with no definitive conclusions (Chris Anderson, 2010) (Askwal, 1985) (Noyes and Graland, 2008). However, one cannot deny the time it takes to store and go through papers manually. Every year, new policies help the user understand the guidelines and operational procedures that they have to follow while being employed by a company. Keeping track of such documents as well as assigning tasks to certain users for revising such are tasks that are lengthy and cumbersome, and are not automated. The software proposed in this paper would help an organization maintain documents, reducing unnecessary tasks and the disk space on the machine

AIDS: The Dreadful Breach in the Immune System (World AIDS Day Guest Comment)

World AIDS Day Guest Comment by Dr. Aman Sharm

Glyphosate Resistance of <em>Chloris virgata</em> Weed in Australia and Glyphosate Mobility Are Connected Problems

The purpose of this review paper is to address two major aspects of glyphosate application on farmers’ fields. The first aspect is the development of glyphosate resistance in weeds like Chloris virgata, and the second aspect is glyphosate mobility, which is directly controlled by soil sorption processes and indirectly by molecule degradation processes. This is a global problem, as excessive glyphosate residues in groundwater, drinking water, and urine of subsistence farmers from intensive agricultural localities have been reported, which can pose a risk to human health. Approaches like biochar as a possible strategy to control glyphosate leaching and crop competition as a cultural method to control glyphosate-resistant weed like Chloris virgata can be the potential solutions of the glyphosate resistance and glyphosate mobility

Privacy preserving data mining

A fruitful direction for future data mining research will be the development of technique that incorporates privacy concerns. Specifically, we address the following question. Since the primary task in data mining is the development of models about aggregated data, can we develop accurate models without access to precise information in individual data records? We analyze the possibility of privacy in data mining techniques in two phasesrandomization and reconstruction. Data mining services require accurate input data for their results to be meaningful, but privacy concerns may influence users to provide spurious information. To preserve client privacy in the data mining process, techniques based on random perturbation of data records are used. Suppose there are many clients, each having some personal information, and one server, which is interested only in aggregate, statistically significant, properties of this information. The clients can protect privacy of their data by perturbing it with a randomization algorithm and then submitting the randomized version. This approach is called randomization. The randomization algorithm is chosen so that aggregate properties of the data can be recovered with sufficient precision, while individual entries are significantly distorted. For the concept of using value distortion to protect privacy to be useful, we need to be able to reconstruct the original data distribution so that data mining techniques can be effectively utilized to yield the required statistics. Analysis Let xi be the original instance of data at client i. We introduce a random shift yi using randomization technique explained below. The server runs the reconstruction algorithm (also explained below) on the perturbed value zi = xi + yi to get an approximate of the original data distribution suitable for data mining applications. Randomization We have used the following randomizing operator for data perturbation: Given x, let R(x) be x+€ (mod 1001) where € is chosen uniformly at random in {-100…100}. Reconstruction of discrete data set P(X=x) = f X (x) ----Given P(Y=y) = F y (y) ---Given P (Z=z) = f Z (z) ---Given f (X/Z) = P(X=x | Z=z) = P(X=x, Z=z)/P (Z=z) = P(X=x, X+Y=Z)/ f Z (z) = P(X=x, Y=Z - X)/ f Z (z) = P(X=x)*P(Y=Z-X)/ f Z (z) = P(X=x)*P(Y=y)/ f Z (z) Results In this project we have done two aspects of privacy preserving data mining. The first phase involves perturbing the original data set using ‘randomization operator’ techniques and the second phase deals with reconstructing the randomized data set using the proposed algorithm to get an approximate of the original data set. The performance metrics like percentage deviation, accuracy and privacy breaches were calculated. In this project we studied the technical feasibility of realizing privacy preserving data mining. The basic promise was that the sensitive values in a user’s record will be perturbed using a randomizing function and an approximate of the perturbed data set be recovered using reconstruction algorithm