About 2% of the world's children are allergic to eggs. They are also unable to accept a lot of routine vaccinations, because the vaccinations are produced by eggs.
Molecular biologists feel that the problem can be solved by powerful crispr genome editing. Most egg allergies are caused by one of the 4 proteins in the egg. When a gene, encoding one of the proteins, is changed, the protein can not be triggered in the serum of the allergic person. The use of CRISPR to edit chicken genes can get eggs that do not cause allergic reactions.
The team hopes to hatch the first generation of genetically modified chicken as a validation of the concept later this year. However, in order to be approved for the listing of the genetically modified eggs, it needs a long period of time.
Chicken is just one of a group of animals that will soon be transformed. Today, the tools owned by researchers can only manipulate a small part of the class of animal genes, and this process is usually not highly efficient and easy. With the advent of CRISPR, they are able to change the genes of many organisms more precisely and simply. In the past two years, when scientists tried to use CRISPR in such as agriculture, pharmaceutical production&recovery and disappeared species, the prospect for editing genes of monkey, mammoth elephant, mosquitoes and other animals is frequently reported in the newspapers. Animals that have been transformed by CRISPR have even been sold as pets in the market.
Regulators, however, are still planning on how to treat such animals, especially those that are used as food or to be released into the wild. Concerns about safety and ecological impact are everywhere. Even the US National Intelligence Director is involved, and said that the easy access to genome editing, low-cost and rapid development, will increase the risk to create harmful biological agents.
The rapid application of CRISPR in animals provides opportunities for researchers and policy makers in the discussion. Such discussions will help determine which CRISPR applications will be most useful to humans, other species and science, and highlight the limits of the technology.
2016年3月23日星期三
2016年2月29日星期一
Progress in the Detection of Liver Disease of Mass Spectrometry Technology
Liver disease is a serious hazard to human health disease. Its etiology is complicated, including infection, tumor and other common factors, as well as including special autoimmune factors, congenital diseases, etc. Clinical most common chronic liver disease is cause by hepatitis B virus (HBV) and hepatitis C virus (HCV) and there are 3.7 billion and 1.3 million patients in the world. Chronic hepatitis often slow progress to liver fibrosis or cirrhosis and may eventually develop to hepatocellular carcinoma (HCC). Hepatic cell cancer has a high mortality rate. According to the World Health Organization, each year around the world there are 600 000 people died of HCC. In addition to virus infection, drug and poison damage, malnutrition and alcoholism, metabolic disorders and other factors are also the main reasons of liver disease.
Mass spectrometry technology development status
Gas chromatography - mass spectrometry (GC/MS) and Liquid Chromatography - Mass Spectrometry (LC/MS) technology are the most commonly used detection methods. Especially the technology has attracted wide attention of scholars in the metabonomics research value. Metabonomics study mostly the endogenous small molecules within the relative molecular weight of 1000. It usually uses nuclear magnetic resonance (NMR), high performance liquid chromatography (HPLC) technologies to separate and detect human urine or plasma metabolites in biological sample spectra, and determine the pathological and physiological state of birth of the object and find out the related biomarkers combined with pattern recognition method. Compared to proteomics research, metabolite molecular detection is easier, and more suitable as markers of disease.
The application of mass spectrometry in the detection of alcoholic liver disease
Some scholars found part protein or metabolite molecules with ALD diagnosis through conditional mouse model establishment of alcohol dependence and mass spectrometric detection. They used proteomics technology of alcohol induced mouse model for analysis of differential protein expression. They extracted cytoplasmic membrane of liver cells, and detected by using bidirectional technology and iTRAQ technology. As a result, a total of 15 different proteins were detected, and the keratin - 8 was tested for significance in two different methods. They thought the molecules might play a role in the liver damage by alcohol.
2016年1月13日星期三
Research methods of biological evolution and point mutation
During the long development process system, a point mutation provides the material for the biological evolution. At present, molecular biology experiments are used to construct the mutant gene, and to study the directed evolution of the organism.
Biological evolution
Virus achieves the diversity and evolution through gene mutation (spontaneous mutation and induced mutation), chromosome aberration (transfer, insertion, deletion, recombination, rearrangement, etc.) and natural selection. In general, the DNA virus survives with the host, whereas the RNA virus uses a variety of hosts—when faced with a risk of the host, it transfers to another host to replicate.
There are at least about 400,000 species of plant species that have been experienced the evolution from aquatic to terrestrial life and from the lower plant to the higher plant. Plants that can't leave the water—the eukaryotic algae; the transitional land plant—the moss; the terrestrial plant—the vascular plant.
The evolution of the human species is related a variety of environmental factors, including temperature adaptability evolution, UV radiation adaptive evolution, sunshine time adaptive evolution, precipitation adaptive evolution, hypobaric hypoxia adaptive evolution, environmental pathogens adaptive evolution and environmental sources adaptation evolution, etc.
point mutation
Oligonucleotide induced gene point mutation
A gene is cloned into a plasmid vector. A pair of primers are synthesized by artificial synthesis of a pair of primers. The mutation is located near the center of the primer, and the two ends have enough sequences to guarantee their pairing and PCR amplification.
In vitro induction of polymerase chain reaction (PCR)
Including error prone PCR, DNA shuffling, staggered extension, DNA family shuffling, RD-PCR reorganization, messy, temporary template fitted technology, single stranded DNA mediated family shuffling and fusion PCR.
Conclusion and prospect
Evolution is an inevitable result of any living being in constant development and change. Molecular biology has provided powerful means and methods for the research of directed evolution. But it also has problems. For example, accidentally, DNA mutation will continue towards opposite human evolution direction. Once these mutations escape the control of the immune system, they will cause cancer.
2015年12月22日星期二
Human/Microbial WGS Promotion at Christmas Season
On the special festival—Christmas Day, CD Genomics introduces Human WGS and Microbial WGS services promotion to thank all the people who are always support it faithfully.
Christmas, this name is the abbreviation of "Christ's mass". Mass is a kind of church service. Christmas is a religious festival. Because we celebrate it as a birth of Jesus, it is also known as christmas. On this day, all the Christian churches in the world hold a special ceremony. The annual United States Christmas sales season is not only to make the national crazy, but also affects the hearts of International consumers. The time from Thanksgiving to Christmas is the most important shopping season in the United States. American business’s big promotion at Christmas is great larger than that on Black Friday, which attracts a vast number of customers.
Whole Genome Sequencing (WGS) is a high throughput sequencing platform for different individuals or groups, and carries on the analysis of biological information at the level of individual or group. The genetic variation of DNA levels can be fully excavated, which provides important information for screening disease genes and studying the pathogenesis & genetic mechanisms.
CD Genomics launches the great discount for cutomers with Human WGS and Microbial WGS.
20% off with any amount of Human/Microbial WGS services
Human whole genome sequencing, experts said that quick and simple sequencing method, will effectively promotes the clinical field of cancer and genetic diseases diagnosis technology, and brings new clues for food safety gene detection.
When pathogenic bacteria cause infectious diseases, preventive medicine workers will face the following important questions: 1. Where are the pathogenic bacteria from? What may be the transmission route? 2. What survival ability, virulence and drug resistance characteristics do pathogens have? 3. What routines are pathogenic causes of disease? High throughput sequencing technology and the rapid development of information technology provide a new idea and solution for the above problems.
Merry Christmas to all!
2015年11月18日星期三
What Are Knockout Mice
What are knockout mice? Is it typically alluded to the research facility white mice? Indeed, mice have numerous sorts, and the white mice is only one sort of those. Typically the ordinary white mice are pharmaceutical utilized for clinical trials, while the knockout gene mice are for more complex biomedical exploration.
Quality knockout mice: in the mouse embryonic undeveloped cells by the method for quality alteration, we change the objective quality, and after that embed the "adjusted" embryonic undifferentiated organisms into the early fetuses to frame allophenic mice. At the point when the allophenic mice grow up, the "altered" quality and the quality that has not been adjusted exist in the body in the same time. In the event that the germ cells of a few mice have been "altered", the mice will bring forth a transgenic mice. (what are transgenic mice?)
Quality knockout utilizing quality homologous recombination:
Quality knockout was produced in 80's with the utilization of DNA homologous recombination standard. In the mid 80's, the segregation and society of embryonic stem (ES) cells in vitro had established a framework for the gene knockout. Quality knockout is still the most widely recognized strategy for developing quality knockout animals model.
Impelled quality knockout is additionally taking into account Cre/loxp framework, yet it can control Cre expression and Cre quality expression framework keeping in mind the end goal to control the time, and to accomplish the objective of hereditary alteration of particular qualities in 1oxP creatures. It can be utilized to control Cre expression.
"knockout mice" itself is an extremely spearheading strategy in the biomedical field, and due to the comparability in the middle of human and mouse qualities, it is conceivable to have the potential for the investigation of human hereditary maladies, for example, coronary illness, diabetes et cetera.
Quality knockout innovation is principally utilized as a part of the foundation of creature model, and the most develop test creatures are mice. The quality knockout model for expansive warm blooded animals is still at the exploratory stage.
Quality knockout mice: in the mouse embryonic undeveloped cells by the method for quality alteration, we change the objective quality, and after that embed the "adjusted" embryonic undifferentiated organisms into the early fetuses to frame allophenic mice. At the point when the allophenic mice grow up, the "altered" quality and the quality that has not been adjusted exist in the body in the same time. In the event that the germ cells of a few mice have been "altered", the mice will bring forth a transgenic mice. (what are transgenic mice?)
Quality knockout utilizing quality homologous recombination:
Quality knockout was produced in 80's with the utilization of DNA homologous recombination standard. In the mid 80's, the segregation and society of embryonic stem (ES) cells in vitro had established a framework for the gene knockout. Quality knockout is still the most widely recognized strategy for developing quality knockout animals model.
Impelled quality knockout is additionally taking into account Cre/loxp framework, yet it can control Cre expression and Cre quality expression framework keeping in mind the end goal to control the time, and to accomplish the objective of hereditary alteration of particular qualities in 1oxP creatures. It can be utilized to control Cre expression.
"knockout mice" itself is an extremely spearheading strategy in the biomedical field, and due to the comparability in the middle of human and mouse qualities, it is conceivable to have the potential for the investigation of human hereditary maladies, for example, coronary illness, diabetes et cetera.
Quality knockout innovation is principally utilized as a part of the foundation of creature model, and the most develop test creatures are mice. The quality knockout model for expansive warm blooded animals is still at the exploratory stage.
What are transgenic mice?
What are transgenic mice?
The exogenous recombinant genes are transfected into the genome of the animal receptor, and the genes can be expressed in vivo of the animals. Transgenic animal expression system includes exogenous gene, expression vector and receptor cell. the transfer of genome are nuclear transplantation and animal cloning technology. Artificial synthesis, design of genes and genome of the transgenic technology belong to synthetic biology.
In 1974, Rudolf Jaenisch created the first mouse to carry exogenous genes by injecting DNA of SV40 virus into the blastocyst of mice. Later, researchers injected the Murine leukemia virus into the mouse embryos, which were stably inherited in the mice, and the exogenous genes could be stably expressed in the offspring. These mice that are genetic stably and can express exogenous genes are that we call transgenic mice now in general.
What are transgenic animals model?
For ordinary transgenic genes, the expression region will depend on the promoter. If we choose the promoter expressing the whole body, like Rosa26, CAG, etc, the whole body-expressed transgenic mice can be produced. If the promoter of a number of tissue-specific genes is chosen, we will gain transgenic mice expressing the specific tissue. For example, under the role of AP2 promoter, the transgenic mice with specific expression of adipose tissue will be gained.
It should be noted that this strategy is to inject the gene fragment directly into the zygote of mice. The transgenic fragment will be randomly inserted into the mouse genome. Because it is completely random, it may be inserted into some of the inhibition zone leading to the gene transfer, but also it may be inserted into some of the enhanced zone leading to the gene high-expression. The first generation of transgenic mice are called founder. Because of the randomness, each founder is not the same. Each founder’s original species is called line. The expression of different lines may be different.
The exogenous recombinant genes are transfected into the genome of the animal receptor, and the genes can be expressed in vivo of the animals. Transgenic animal expression system includes exogenous gene, expression vector and receptor cell. the transfer of genome are nuclear transplantation and animal cloning technology. Artificial synthesis, design of genes and genome of the transgenic technology belong to synthetic biology.
In 1974, Rudolf Jaenisch created the first mouse to carry exogenous genes by injecting DNA of SV40 virus into the blastocyst of mice. Later, researchers injected the Murine leukemia virus into the mouse embryos, which were stably inherited in the mice, and the exogenous genes could be stably expressed in the offspring. These mice that are genetic stably and can express exogenous genes are that we call transgenic mice now in general.
What are transgenic animals model?
For ordinary transgenic genes, the expression region will depend on the promoter. If we choose the promoter expressing the whole body, like Rosa26, CAG, etc, the whole body-expressed transgenic mice can be produced. If the promoter of a number of tissue-specific genes is chosen, we will gain transgenic mice expressing the specific tissue. For example, under the role of AP2 promoter, the transgenic mice with specific expression of adipose tissue will be gained.
It should be noted that this strategy is to inject the gene fragment directly into the zygote of mice. The transgenic fragment will be randomly inserted into the mouse genome. Because it is completely random, it may be inserted into some of the inhibition zone leading to the gene transfer, but also it may be inserted into some of the enhanced zone leading to the gene high-expression. The first generation of transgenic mice are called founder. Because of the randomness, each founder is not the same. Each founder’s original species is called line. The expression of different lines may be different.
2015年11月5日星期四
Doctorate of Japanese female scientist Obo Kataharuko is officially canceled
Japan's Waseda University reported the official cancelation of Obo Kataharuko's doctoral degree on November second. Waseda University a year prior found that Obo Kataharuko's doctoral suggestion had the issue of picture misappropriation, and asked for that modify in one year and re-submitted papers according to the academic standards. Yet, the last certification of the Waseda University demanded that Obo Kataharuko's adjusted papers fail to meet the necessities of the study, so her doctoral degree was scratched off formally.
Obo Kataharuko had requested to widen the terms from the modification, yet which was rejected by the Waseda University for whole deal impermanent hold issue of paper. Obo Kataharuko, who proceeded onward from Waseda University in 2011, got a doctorate from the University.
Obo Kataharuko circulated papers on the United Kingdom "nature" magazine in mid 2014, ensuring that the viable advancement of another "comprehensive cell" - "STAP cells", scrounging up a buzz in the exploratory world. Regardless, soon, reiterated test's examination gathering pointed out that there were various inquiries in her paper. After an intensive examination, Japan's Institute of science and science reported that the paper is "produced" and "modifying" in April 2014, and in September this year proclaimed that the assumed new comprehensive cell was truly gotten from the security of embryonic undifferentiated life forms.
This academic deception event is clearing. Obo Kataharuko herself surrendered from the Institute of Japanese science and science. Event included American scientist Charles·Vacanti furthermore surrendered from the Harvard joined forces mending office. The more unmistakable calamity is that Obo Kataharuko's aide I Yoshiki presented suicide.
Reference
Exhaustive cells can isolate into a grouping of different sorts of cells. This limit can people to make and transplant in xenograft tumor models, besides to keep up a key separation from the occasion of rejection reaction. The latest investigation results are that the human skin cells are changed into the across the board cells through quality transformation(gene knockdown methods). Exhaustive cells are in like manner "IPS cells
Obo Kataharuko had requested to widen the terms from the modification, yet which was rejected by the Waseda University for whole deal impermanent hold issue of paper. Obo Kataharuko, who proceeded onward from Waseda University in 2011, got a doctorate from the University.
Obo Kataharuko circulated papers on the United Kingdom "nature" magazine in mid 2014, ensuring that the viable advancement of another "comprehensive cell" - "STAP cells", scrounging up a buzz in the exploratory world. Regardless, soon, reiterated test's examination gathering pointed out that there were various inquiries in her paper. After an intensive examination, Japan's Institute of science and science reported that the paper is "produced" and "modifying" in April 2014, and in September this year proclaimed that the assumed new comprehensive cell was truly gotten from the security of embryonic undifferentiated life forms.
This academic deception event is clearing. Obo Kataharuko herself surrendered from the Institute of Japanese science and science. Event included American scientist Charles·Vacanti furthermore surrendered from the Harvard joined forces mending office. The more unmistakable calamity is that Obo Kataharuko's aide I Yoshiki presented suicide.
Reference
Exhaustive cells can isolate into a grouping of different sorts of cells. This limit can people to make and transplant in xenograft tumor models, besides to keep up a key separation from the occasion of rejection reaction. The latest investigation results are that the human skin cells are changed into the across the board cells through quality transformation(gene knockdown methods). Exhaustive cells are in like manner "IPS cells
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