Becoming available and genomic libraries of tissues and many different agencies. In this case, researchers in Valencia have been cloned and sequenced cDNA fragments of the venom-producing gland in Cerastes Viper and short disintegrins encoding and subunits of dimeric disintegrins. From the analysis of messenger RNA conclude that these molecules could be distributed over a larger number of tissue than initially believed. Furthermore, sequence comparison suggests a common ancestor for short disintegrins for dimeric disintegrins precursor chains.

The most interesting part of the study is that for the first time, shows the parallel evolution of the blocking sequence of the disintegrins from the venom of snakes and integrin alpha chains, which are cellular receptors. Also presented are specific patterns of evolutionary adaptation of the antagonists of snake venom ligand regions of the integrin receptor.

These studies are also directly related to the laboratory can produce potent inhibitors of angiogenesis, which could be used in the design of new ant tumor drugs directed against surface receptors of cancer cells.

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• parallel evolution of snakes

The coupling of these protein structures determined at what point is the origin of initiation of DNA replication. Described the mechanism directly involved in the regulation of a locus, under conditions of cellular stress, which seems essential to avoid the initiation of tumor growth: Ink4/Arc locus, coding for three tumor suppressor. Previously had been proposed that certain alterations in this gene could cause the appearance of tumores.2 The description of this genomic region as a regulator opens new avenues in drug research and avoid blocking the inactivation of tumor suppressor involved .

These new lines, followed by young researchers (increasingly more often, in our own country), to suggest alternatives to regulate senescence and apoptosis processes as yet unidentified, may represent the key to investigations not too remote in time pointing in a more accurate and effective in preventing tumors right there where its true origin or desencadenamiento.3 A tool and an approach to take into account.

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• dna sequencing
• molecular relationship between cell division and development of cancer
• séquençage principe Sanger ADN
• sanger-coulson method of dna sequencing
• sanger sequencing
• proteína SCC1
• molecular relationships between cancer and cell division
• maxam gilbert sequencing
• DNA sequencing 35S 32p
• sequenciation sanger method

The research was led by Manuel Serrano, one of the young scientists with their own research group at the CNIO, and the development of work have helped other groups in the center of cancer research, as well as Salamanca and Hospital October 12 . It appears that the work that led to the consolidation of the CNIO in 2003 is bearing fruit, with a handful of scientists are particularly active in leading-edge research on cancer, and their roots in the valuable work of training young researchers carried out especially by Margarita Salas and Gins Morata, among others, during the past two decades from the laboratories of the Center for Molecular Biology Severo Ochoa.

Lysine, threonine, methionine and isoleucine are essential amino acids that share the common precursor aspartate and which are synthesized in the chloroplasts of plant leaves or in the plastids of non-photosynthetic organs, such as seeds and roots. Until now it was believed that the aspartate was synthesized by the action of aspartate aminotransferase similar to that in mammals, although gene knockout mutants did not show any phenotype.

A study carried out in the Department of Biochemistry and Molecular Biology, University of Malaga has demonstrated the existence in plastids of plants of another form of aspartate aminotransferase enzyme very similar to cyanobacteria and has greater affinity for the enzyme glutamate previously characterized. In an article published in Plant Journal, the authors propose that the physiological role of this new enzyme is the conversion of glutamate to aspartate for the biosynthesis of lysine, threonine, methionine and isoleucine. It is estimated that about 18% of plant genes derived from cyanobacteria. This gene transfer to plants by endosymbiotic event would explain the absence of this enzyme in animals and the essential nature of these amino acids in the diet.

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• biosynthesis of essential amino acids
• compartment and biosynthesis and isoleucine

The natural solution to the problem is offered by the so-called topoisomerases, resulting in transient cuts the strands of DNA to relax the tension coil. A team from the Institute of Molecular Biology of Barcelona, CSIC has described the mechanism by which stress relaxes when helical DNA is condensed into chromosomes. The results of work directed by Joaquim Roca and published in EMBO Journal contradict the general view of the role of topoisomerases. So far, it was believed that the topoisomerase-I was the main relaxing the DNA, while topoisomerase-II was the only function and trigger untangle DNA before dividing. This study demonstrates that topoisomerase-II is also the main relaxing of tension when the DNA is folded into chromosomes.

The key finding has been to discover the precise type of cut made by each enzyme DNA: features of the two strands of double helix-II topoisomerase cuts both, allowing another DNA chain nearby temporary pass through this gate that just opened. Thus, it relieves tension and knots are removed. By contrast, the topoisomerase-I just cut one strand, and therefore is not effective in reducing tension in the whole molecule.

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• joaquim roca csic

It is clear from the comments, p38aMAP deficient cells are more resistant to enter apoptosis, by reducing the expression of proapoptotic proteins Bax and Fas, and enhancing the expression of a specific pattern of survival. The results also show an increased Akt activity in these cells leads to increased survival time of p38aMAP deficient cardiomyocytes. Akt is a key protein complex in the path of cell survival by inhibiting apoptotic signals, with a clear implication in cancer and other diseases. The conclusions of the study postulated a possible modulator of Akt activity mediated by the kinase negatively p38αMAP through regulating the interaction between caveolin-1 and protein phosphatase PP2A that requires a binding mechanism in the cell membrane. One more example of the different and complex levels of interaction that control cell signaling patterns determination and fate of animal cells.

Within this general scheme, CDK2 has been proposed as a key regulator of centrosome duplication. Research published in Oncogene, with Spanish participation Mariano Barbacid group, the National Cancer Centre (CNIO), has used mouse embryonic fibroblasts with the Cdk2 gene deletions, to show the effect of this protein in the process of doubling DNA during the S phase The authors have observed that CDK2 is not required for normal duplication of centrosomes or for mitotic spindle formation.

By contrast, Cdk2 deficiency appears to suspend the aberrant centrosome duplication induced by the activity of a viral oncogene, used as a tool for determining mechanisms of progression and tumor development. The results indicate a differential requirement for CDK2 activity in normal and impaired duplication of centrosomes, suggesting a role of CDK2 in licensing requirements for aberrant duplication of centrosomes. The conclusions of the work affect the chances of CDK2 as a potential therapeutic target for inhibition of chromosomal instability associated with the development of tumor cells.

Researchers have found that this gene acts as a reducer of glycolysis. p53 is operated against cellular stress. When the damage caused by cell stress is relatively mild, the p53 protein activates the mechanism of cell cycle arrest, resulting in the repair of DNA damage. If the damage is substantial or irreparable, p53 initiates the process of apoptosis.

One of the main agents that cause mutations in the DNA of cells are molecules called reactive oxygen species (ROS), which include the known free radicals. In case of mild cellular stress, p53 activates the gene Tigar, which decreases the rate of glycolysis and hence the presence of ROS in the cell. However, if cell stress is irreparable, it produces the opposite strategy and p53 induces a greater presence of ROS molecules to trigger apoptosis or cell death, preventing the proliferation of cells with altered DNA.

The authors have shown how, in the event of loss of Tigar, cells rapidly entered apoptosis with minimal stress. And propose a model of p53 function, whereby at first, after oxidative stress, this protein activated the antioxidant gene Tigar to gain control of ROS molecules and facilitate DNA repair before they increase the stress and will trigger a possible tumor proliferation.

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Aging is the major risk factor for tumor development and yet, until recently not well known the molecular reasons for this relationship, it was logical to assume that inactivation of a gene that prevents aging (such as causing Werner’s syndrome) could have a role in the development of cancer. According to the study, the loss of activity of this gene by methylation of their regulatory region, has been detected in various tumor types, including soft and solid, and being the first tumor suppressor gene with such wide distribution.

The function of this gene is to protect cells from injury, through its helicase and exonuclease activity that promotes DNA repair. However, its inactivation by methylation causes the onset of chromosome fragmentation and development of genomic instability prior to tumor development. The reintroduction of the defective gene in a cell-tumor properties in laboratory cell cultures and in mouse models, opening the door to improved treatment of certain tumors, based on the understanding of these interactions.

Since capital works on the establishment of patterns during embryonic development of insectos1 until the discovery of cell adhesion proteins central to the development of the Drosophila tracheal system, 2 Casanova and his group have developed a dynamic activity in this world that seeks to better understand how an organism develops and how it gains the inherent complexity of its various organs. But it is also important to highlight the importance of this work for a global evolutionary vision. Studying the details of character development limiter decipher what is possible in evolution.

Not everything is possible, since development and morphogenesis are limiting factors of the variation available to natural selection. It is something that is evident in works the same group, where different organs or systems with similar functions, but apparently different structure may be homologous in different groups of organisms. This is the case of the tracheal gills of insects and crustaceans, both respiratory function, but some internal and others external to organismo.3