Programming cell growth into different cluster shapes using diffusible signals.

Advances in genetic engineering technologies have allowed the construction of artificial genetic circuits, which have been used to generate spatial patterns of differential gene expression. However, the question of how cells can be programmed, and how complex the rules need to be, to achieve a desired tissue morphology has received less attention. Here, we address these questions by developing a mathematical model to study how cells can collectively grow into clusters with different structural morphologies by secreting diffusible signals that can influence cellular growth rates. We formulate how growth regulators can be used to control the formation of cellular protrusions and how the range of achievable structures scales with the number of distinct signals. We show that a single growth inhibitor is insufficient for the formation of multiple protrusions but may be achieved with multiple growth inhibitors, and that other types of signals can regulate the shape of protrusion tips. These examples illustrate how our approach could potentially be used to guide the design of regulatory circuits for achieving a desired target structure.

A Shift Towards Biotechnology: Social Opinion in the EU.

Consumers' attitude to genetic engineering provides information to stakeholders who are interested in its adoption, which is essential considering the emerging growth of new breeding techniques. This short article analyses, compares, and describes the knowledge, doubts, and concerns of Europeans about biotechnology and genetic engineering over the past 20 years.

Generation of transgenic goats by pronuclear microinjection: a retrospective analysis of a commercial operation (1995-2012).

Production of transgenic founder goats involves introducing and stably integrating an engineered piece of DNA into the genome of the animal. At LFB USA, the ultimate use of these transgenic goats is for the production of recombinant human protein therapeutics in the milk of these dairy animals. The transgene or construct typically links a milk protein specific promoter sequence, the coding sequence for the gene of interest, and the necessary downstream regulatory sequences thereby directing expression of the recombinant protein in the milk during the lactation period. Over the time period indicated (1995-2012), pronuclear microinjection was used in a number of programs to insert transgenes into 18,120, 1- or 2- cell stage fertilized embryos. These embryos were transferred into 4180 synchronized recipient females with 1934 (47%) recipients becoming pregnant, 2594 offspring generated, and a 109 (4.2%) of those offspring determined to be transgenic. Even with new and improving genome editing tools now available, pronuclear microinjection is still the predominant and proven technology used in this commercial setting supporting regulatory filings and market authorizations when producing founder transgenic animals with large transgenes (> 10 kb) such as those necessary for directing monoclonal antibody production in milk.

Genome Editing and Its Applications in Model Organisms.

Technological advances are important for innovative biological research. Development of molecular tools for DNA manipulation, such as zinc finger nucleases (ZFNs), transcription activator-like effector nucleases (TALENs), and the clustered regularly-interspaced short palindromic repeat (CRISPR)/CRISPR-associated (Cas), has revolutionized genome editing. These approaches can be used to develop potential therapeutic strategies to effectively treat heritable diseases. In the last few years, substantial progress has been made in CRISPR/Cas technology, including technical improvements and wide application in many model systems. This review describes recent advancements in genome editing with a particular focus on CRISPR/Cas, covering the underlying principles, technological optimization, and its application in zebrafish and other model organisms, disease modeling, and gene therapy used for personalized medicine.

Patenting drought tolerance in organisms.

Dehydration is a major form of osmotic stress in cells. Physiological and molecular basis of dehydration stress responses in cells and organisms has been intensively researched over past years. Almost all of the patented dehydration stress tolerance genes from different organisms were used in engineering drought tolerance in crop plants. In spite of the moral, religious and ethical controversies surrounding use of foreign DNA sequences in crop plants, the numbers of such patents has grown tremendously in recent years. In future, we might witness another rise in patents on use of dehydration stress related gene sequences in creating environmental stress tolerant biological control agents for plant disease and insect pest management in agriculture. This review summarizes some of the recent published patents related to drought tolerance genes and their use.

Engineering microbial consortia: a new frontier in synthetic biology.

Microbial consortia are ubiquitous in nature and are implicated in processes of great importance to humans, from environmental remediation and wastewater treatment to assistance in food digestion. Synthetic biologists are honing their ability to program the behavior of individual microbial populations, forcing the microbes to focus on specific applications, such as the production of drugs and fuels. Given that microbial consortia can perform even more complicated tasks and endure more changeable environments than monocultures can, they represent an important new frontier for synthetic biology. Here, we review recent efforts to engineer synthetic microbial consortia, and we suggest future applications.

DNA patenting: the end of an era?

Debates on patenting DNA must evolve to reflect the global decline in filings and regional disparities in patenting activity.

Genetic engineering and functional foods / Engenharia genética e alimentos funcionais

Functional foods are the food-industry response to the continuous ly increasing request of consumers for foods that are both attractive and healthy. The main targets of functional foods are intestinal health, immune system activity, mental performance, caries, menopause symptoms, cancer, cardiovascular disease, diabetes, osteoporosis and child skeletal development. Most of the functional foods designed so far are derived from traditional foods by adding so-called functional ingredients, by modifying the technological process during industrial food preparation or by modifying the composition of the raw material used for food production. However, gene technology is thought to be a powerful technique to improve the nutritional quality of food raw materials. The modification of product quality characteristics using gene technology depends on a well-establishe dunder standing of the pathways for biosynthesis of plant products, a rapidly expanding knowledge about the genetic control of these pathways, and an increasing availability of cloned genes for key enzymatic steps. Quality-improved crops derived from genetic engineering are expected to reach the market in the near future. Crops with an improved protein quality, with an improved nutritional quality of the plant oil, crops rich in vitamins, minerals, antioxidants or low in undesired compounds as well as crops with an altered secondary metabolite production or altered carbohydrate composition have been developed by genetic engineering. These examples give an idea of the genetic engineering potential to produce health-promoting foods

Los alimentos funcionales son la respuesta de la industria de alimentos a la creciente demanda de los consumidores por alimentos que sean al mismo tiempo atrayentes y saludables. Los principales objetivos de los alimentos funcionales son la salud intestinal, del sistema inmunológico,el desempeño mental, las caries, los síntomas dela menopausia, cáncer, enfermidades cardiovasculares, diabetes, osteoporosis y desenvolvimiento óseo en niños. La mayoría de los alimentos funcionales desarrollados hasta el momento son derivados de los alimentos tradicionales a los cuales se les adicionan los ingredientes funcionales, se les modifica el proceso tecnológico de industrialización o se les altera la composición de materias primas utilizadas en su producción. Sin embargo, se tiene por cierto que la tecnología genética es un instrumento poderoso para mejorar la calidad nutricional de las materias primas alimenticias. La modificación de las características de calidad del producto utilizando tecnología genética depende de un conocimiento asentado de las vías metabólicas de síntesis de productos vegetales, un conocimiento en rápida expansión sobre el control genético de tales vías y una creciente disponibilidad de genes clonados para la expresión de enzimas claves de algunos passos de esas vías. Se espera que cultivos con calidad mejorada originarios de ingeniería genéticalleguen al mercado en un futuro próximo.Cultivos con mejor calidad de proteínas y lípidos, con mayor concentración de vitaminas, minerales y antioxidantes, con bajos tenores decompuestos indeseables y también cultivos com metabolitos secundarios modificados o composición alterada de carbohidratos son ejemplos de logros ya alcanzados por la ingeniería genética. Los ejemplos mencionados permiten visualizar el potencial de la ingeniería genética para la producción de alimentos promotores de la salud

Os alimentos funcionais são a resposta da indústria alimentícia à sempre crescente demanda dos consumidores por alimentos ao mesmo tempo atraentes e saudáveis. Os principais alvos dos alimentos funcionais são a saúde intestinal, a atividade do sistema imune, o desempenho mental, cáries, sintomas da menopausa, câncer, doenças cardiovasculares, diabetes, osteoporose e desenvolvimento ósseo de crianças. A maioria dos alimentos funcionais desenvolvidos, até o momento, são derivados de alimentos tradicionais pela adição dos ditos ingredientes funcionais, modificação dos processos tecnológicos durante o preparo industrial dos alimentos ou alteração da composição das matérias-primas usadas na produção dos alimentos. Contudo, acredita-se que a tecnologia genética seja um poderoso instrumento para melhorar a qualidade nutricional das matérias-primas alimentícias. A modificação das características de qualidade do produto usando a tecnologia genética depende de um conhecimento bem embasado sobre as rotas metabólicas de síntese de produtos vegetais, um conhecimento em rápida expansão sobre o controle genético de tais rotas metabólicas, e uma crescente disponibilidade de genes clonados para expressão de enzimas-chave de alguns passos destas rotas. Espera-se que culturas com qualidade melhorada derivadas da engenharia genética cheguem ao mercado num futuro próximo. Culturas com qualidade proteica melhorada, com melhor qualidade nutricional do óleo vegetal derivado, culturas ricas em vitaminas, minerais, antioxidantes ou com baixos teores de compostos indesejáveis, bem como culturas com produção de metabólitos secundários alterados ou composição alterada de carboidratos já foram desenvolvidas pela engenharia genética. Estes exemplos dão uma ideia do potencial da engenharia genética para produzir alimentos promotores de saúde

Global trends in plant transgenic science and technology (1973-2003).

Transgenic science and technology are fundamental to state-of-the-art plant molecular genetics and GM crop improvement. Monitoring the scale and growth of this area of science is important to scientists, national and international research organizations, funding bodies, policy makers and, because of the GM debate, to society as a whole. Literature statistics covering the past 30 years reveal a dramatic increase in plant transgenic science in Asia during the past decade, a sustained expansion in North America and, recently, a slow down in the rest of the world. With the exception of the output of China and India, publications focusing on the development of transgenic technology have been slowing down, worldwide, since the early mid-1990s, a trend that contrasts with the increase in GM crop-related studies.

Importance of input perturbations and stochastic gene expression in the reverse engineering of genetic regulatory networks: insights from an identifiability analysis of an in silico network.

Gene expression profiles are an increasingly common data source that can yield insights into the functions of cells at a system-wide level. The present work considers the limitations in information content of gene expression data for reverse engineering regulatory networks. An in silico genetic regulatory network was constructed for this purpose. Using the in silico network, a formal identifiability analysis was performed that considered the accuracy with which the parameters in the network could be estimated using gene expression data and prior structural knowledge (which transcription factors regulate which genes) as a function of the input perturbation and stochastic gene expression. The analysis yielded experimentally relevant results. It was observed that, in addition to prior structural knowledge, prior knowledge of kinetic parameters, particularly mRNA degradation rate constants, was necessary for the network to be identifiable. Also, with the exception of cases where the noise due to stochastic gene expression was high, complex perturbations were more favorable for identifying the network than simple ones. Although the results may be specific to the network considered, the present study provides a framework for posing similar questions in other systems.