Diagnóstico molecular de pérdida de heterocigosidad para 1p/19q en tumores oligodendrogliales por PCR multiplex en el Instituto Nacional de Enfermedades Neoplásicas, Lima- Perú.

A heterozygosity loss of 1p/19q has clinical prognostic value and is strongly associated with classical histologic features of oligodendroglioma. Objectives: The present article proposes a molecular method to determine the loss of heterozygosity (LOH) for 1p/19q and to allow the classification of oligodendroglial tumors. Material and Methods: Fresh samples from the National Institute of Neoplastic Diseases Tumor BioBank and paraffin-embedded tissue biopsies of oligodendroglial tumors with pathological diagnosis of oligodendroglioma and oligoastrocytoma were used. The proposed methods are Multiplex PCR and amplification of fragments by capillary electrophoresis of PCR products, and were applied to a total of 39 cases which presented histological grade II and III. Results: The results obtained allow an adequate molecular classification of oligodendroglial tumors.La pérdida de heterocigosidad 1p/19q tiene valor pronóstico clínico y está fuertemente asociada con características histológicas clásicas de oligodendroglioma. Objetivos: El presente artículo, propone un método molecular para determinar la pérdida de heterocigosidad (LOH por sus siglas en inglés) para 1p/19q y permitir la clasificación de tumores oligodendrogliales. Material y Métodos: Se utilizaron muestras en fresco del Banco de Tejidos Tumorales del Instituto Nacional de Enfermedades Neioplásicas (INEN) y biopsias de tejido embebido en parafina de tumores oligodendrogliales, con diagnóstico patológico de oligodendroglioma y oligoastrocitoma. Los métodos propuestos son PCR Multiplex y amplificación de fragmentos por electroforesis capilar de los productos de PCR, y fueron aplicados a un total de 39 casos que presentaban grado histológico II y III. Resultados: Los resultados obtenidos permiten una adecuada clasificación molecular de los tumores oligodendrogliales

Association between Ancestry-Specific 6q25 Variants and Breast Cancer Subtypes in Peruvian Women

Background: Breast cancer incidence in the United States is lower in Hispanic/Latina (H/L) compared with African American/ Black or Non-Hispanic White women. An Indigenous American breast cancer-protective germline variant (rs140068132) has been reported near the estrogen receptor 1 gene. This study tests the association of rs140068132 and other polymorphisms in the 6q25 region with subtype-specific breast cancer risk in H/Ls of high Indigenous American ancestry. Methods: Genotypes were obtained for 5,094 Peruvian women with (1,755) and without (3,337) breast cancer. Associations between genotype and overall and subtype-specific risk for the protective variant were tested using logistic regression models and conditional analyses, including other risk-associated polymorphisms in the region. Results: We replicated the reported association between rs140068132 and breast cancer risk overall [odds ratio (OR), 0.53; 95% confidence interval (CI), 0.47-0.59], as well as the lower odds of developing hormone receptor negative (HR-) versus HR+ disease (OR, 0.77; 95% CI, 0.61-0.97). Models, including HER2, showed further heterogeneity with reduced odds for HR+HER2+ (OR, 0.68; 95% CI, 0.51-0.92), HR-HER2+ (OR, 0.63; 95% CI, 0.44-0.90) and HR-HER2- (OR, 0.77; 95% CI, 0.56-1.05) compared with HR+HER2-. Inclusion of other risk-associated variants did not change these observations. Conclusions: The rs140068132 polymorphism is associated with decreased risk of breast cancer in Peruvians and is more protective against HR- and HER2+ diseases independently of other breast cancer-associated variants in the 6q25 region. Impact: These results could inform functional analyses to understand the mechanism by which rs140068132-G reduces risk of breast cancer development in a subtype-specific manner. They also illustrate the importance of including diverse individuals in genetic studies.National Institutes of HealthRevisión por pare

Detection of <i>Bursaphelenchus Xylophilus</i>, Causal Agent of Pine Wilt Disease on <i>Pinus pinaster</i> in Northwestern Spain

The pine wood nematode, Bursaphelenchus xylophilus (Steiner &amp; Buhrer) Nickle, a quarantine organism, causes serious damage to pines worldwide. In Europe, it was first detected in Portugal in 1999 (3) and the pathogen was thought to be restricted to this area. However, in 2008, B. xylophilus was isolated from a single tree in the Cáceres Region (Extremadura) of Spain, bordering Portugal (2). The region of Galicia has approximately 383,632 ha of Pinus pinaster Aiton that constitutes more than 40% of the surface of Spain. Since 1999, we have analyzed 5,155 samples to monitor the presence of the pathogen. In 2008, a Spanish national contingency plan established three delimiting sampling areas, including a high risk area 20 km from the border with Portugal (2 × 2 km grid), a medium risk area 80 km wide (4 × 4), and another area covering the whole region (8 × 8). The plan required collecting samples from symptomatic trees. In 2010, in the high risk area, 307 sites were surveyed in coniferous forests. At each site, wood chip samples were collected from five pine trees. The collected wood chips were then incubated for 15 days in the lab and nematodes were extracted by Baermann's funnel method. B. xylophilus was detected from a decayed mass of P. pinaster from the As Neves Municipality (Pontevedra, Galicia). Affected specimens showed typical symptoms associated with pine wilt, including needle discoloration and death of branches. B. xylophilus was identified by morphological and molecular methods. Morphological characteristics included high lips, constricted heads, and short stylets with reduced basal knobs. Females had rounded tails, some with a short mucro, and flat vulva, while males had spicules curved with a cucullus. Measurements of these nematodes (10 females: body length = 720.99 ± 123.87 μm, a = 41.07 ± 5.83, b = 9.22 ± 3.44, c = 26.57 ± 4.13, V = 73.2, stylet length = 14.91 ± 1.65 μm; 10 males: body length = 576.4 ± 88.16 μm, a = 38.12 ± 5.36, b = 7.83 ± 0.39, c = 23.07 ± 2.59, stylet length = 14.63 ± 1.95 μm, spicules length = 22.5 ± 2.21 μm) were similar to the isolates found in Portugal described by Penas et al.(4) and smaller than described by Mota et al. (3). Molecular diagnosis was done following the protocols recommended by the EPPO (1): (i) Amplification of satellite DNA of B. xylophilus by PCR obtaining fragments of 160, 320, and 480 bp; (ii) PCR amplification of a region of 77 bp satellite DNA of B. xylophilus by Taqman Real Time; and (iii) PCR-restriction fragment length polymorphism of the internal transcribed spacer (ITS) region of Bursaphelenchus spp. nrDNA obtaining the restriction pattern for B. xylophilus. The ITS product amplified by PCR was also sequenced, showing a 99% homology with the sequences of B. xylophilus deposited in GenBank. A sequence of this nematode was submitted to GenBank database and assigned the number HQ646254. On the basis of these diagnostic characteristics, we have confirmed that B. xylophilus is now present in Galicia (northwestern Spain), which is one of the most productive and important region of Spain for forestry. References: (1) EPPO Bull. 39:344, 2009. (2) EPPO Rep. Serv. 3:2010/051, 2010. (3) M. M. Mota et al. Nematology 1:727, 1999. (4) A. C. Penas et al. J. Nematol. Morphol. Syst. 10:137, 2008. </jats:p

Sopa de leche

Receta extraída del cuaderno Gran Reposteria del Mundo: confitura

Sopa dorada

Receta extraída del cuaderno que trata del modo de hacer dulces que lo dedica L.P. para el uso de la Sra. María Mercedes Picoaga en Lima-Perú en el año 1828

Empanada

Receta extraída del cuaderno que trata del modo de hacer dulces que lo dedica L.P. para el uso de la Sra. María Mercedes Picoaga en Lima-Perú en el año 1828.La harina de maíz se cierne bien, después se hecha a la batea lo que bastare. Se hecha una libra de azúcar, quince huevos, un poco de vino, agua de azar y se hace batir en un punto de bizcochuelo. Estando ya en sazón se ponen los ingredientes que digo, sino bajará el punto del batimiento, y estando ya hecha la masa en lugar de salsa, entra manjar blanco, pasas, jugo, canela pastillas de boca, agua de azar, todo junto se pone en mediano, y se forman empanadas, y se mete al horno en cocimiento

Empanada dulce de maiz

Receta extraída del cuaderno que trata del modo de hacer dulces que lo dedica L.P. para el uso de la Sra. María Mercedes Picoaga en Lima-Perú en el año 1828.La harina de maíz se cierne bien, después se hecha a la batea lo que bastare. Se hecha una libra de azúcar, quince huevos, un poco de vino, agua de azar y se hace batir en un punto de bizcochuelo. Estando ya en sazón se ponen los ingredientes que digo, sino bajará el punto del batimiento, y estando ya hecha la masa en lugar de salsa, entra manjar blanco, pasas, jugo, canela pastillas de boca, agua de azar, todo junto se pone en mediano, y se forman empanadas, y se mete al horno en cocimiento

Empanada dulce en hoja

Receta extraída del cuaderno que trata del modo de hacer dulces que lo dedica L.P. para el uso de la Sra. María Mercedes Picoaga en Lima-Perú en el año 1828.La harina de maíz se cierne bien, después se hecha a la batea lo que bastare. Se hecha una libra de azúcar, quince huevos, un poco de vino, agua de azar y se hace batir en un punto de bizcochuelo. Estando ya en sazón se ponen los ingredientes que digo, sino bajará el punto del batimiento, y estando ya hecha la masa en lugar de salsa, entra manjar blanco, pasas, jugo, canela pastillas de boca, agua de azar, todo junto se pone en mediano, y se forman empanadas, y se mete al horno en cocimiento