Malformación Vascular Linfática en un Recién Nacido / Vascular Lymphatic Malformation in a Newborn

Las malformaciones vasculares son enfermedades poco frecuentes que representan errores en el desarrollo de los vasos sanguíneos. Las malformaciones vasculares linfáticas (MVL) consisten en lesiones congénitas del sistema linfático compuestas por canales y cavidades de diferente tamaño que resultan en la acumulación de linfa. Las malformaciones macroquísticas se manifiestan como tumoraciones palpables, de consistencia blanda pero no compresible. La localización más frecuente es en la cabeza y el cuello Se presenta el caso de un neonato con una malformación vascular linfática localizada en zona postero-lateral de cuello. Se arribó al diagnóstico en base a la clínica y las características ecográficas. El tratamiento fue muy satisfactorio luego de dos procedimientos de escleroterapias, presentando una excelente evolución

Vascular malformations are rare conditions associated to anomalies in blood vessel development. Lymphatic vascular malformations are congenital lesions consisting of channels and sacs of different size caused by lymph fluid acumulation. Macrocystic vascular malformations present as non-compresible soft tissue masses. They are generally found withinthe head and neck (70%-80%). We present the case of a newborn with a lymphatic vascular malformation in the posterior cervical área. The diagnosis was made on the basis of clinical and ultrasound findings. Sclerotherapy was succesful wihout signs of recurrence

Analysis of genetic diversity and population structure in Argentine and Bolivian Creole cattle using five loci related to milk production

Data from five protein-coding loci related to dairy production were used to study the genetic diversity and population structure of Argentine and Bolivian Creole cattle breeds. Genomic DNA was extracted from blood samples of six Creole cattle breeds: Argentine (n = 230), Patagonian (n = 25); "Saavedreño" (n = 140), "Chaqueño Boliviano" (n = 30), "Yacumeño" (n = 27), and "Chusco" (n = 11). kappa-casein, beta-lactoglobulin, growth hormone and prolactin were measured by PCR-RFLP, while alphaS1-casein was typed by PCR-ASO. The results are discussed, focusing on: historical origin, recent differentiation and selection events, Zebu gene introgression, and population structure. This work shows that: (i) For the studied genes, the observed gene frequency profiles of Argentine and Bolivian Creole cattle breeds were close to the data reported for Iberian breeds and for other South-American Creole cattle breeds which are historically related; (ii) although Zebu gene introgression has been reported at the studied loci, these breeds seem to be far from the Zebu gene frequency profiles; and (iii) the Argentine and Bolivian Creole cattle showed significant levels of subdivision, but each population has maintained its degree of genetic variability

Genetic variability and population structure in loci related to milk production traits in native Argentine Creole and commercial Argentine Holstein cattle

Muitas raças de gado foram submetidas a alta pressäo de seleçäo para caracteres de produçäo. Conseqüentemente, a estrutura genética e a distribuiçäo alélica da populaçäo poderiam diferir em raças sob alta pressäo de seleçäo, quando comparadas a raças näo selecionadas. Foi feita a análise das freqüências dos genes de K-caseína, aS1-caseína e prolactina em rebanhos de gado Creole argentino (AC) e Holstein argentino (AH). Os valores de FST calculados mediram o grau de diferenciaçäo genética de subpopulaçöes, dependendo de variaçöes na freqüência dos genes. A raça AC apresentou variaçäo consideravelmente maior entre os rebanhos nos loci de aS1-caseína e K-caseína. Estratégias de conservaçäo devem considerar a populaçäo inteira de AC de forma a manter a variabilidade genética encontrada nesta raça nativa.