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Topic: Reverse genetics

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Molecular genetics

Classical genetics

RNA interference

Luchino Visconti

Aspergillus niger

	Reverse Genetics
		Reverse genetics is a particular approach in discovering the function of a gene that usually goes in the opposite direction of what is called as forward genetic screens associated with classical genetics.
		To put it simply, while forward genetics has the goal of trying to find the genetic basis of a phenotype or trait, reverse genetics is aimed at finding the possible phenotypes that may be derived from a specific genetic sequence that is detailed in a DNA sequencing.
		Reverse genetics is an attempt to connect a given genetic sequence with specific effects on the organism.
	www.iscid.org /encyclopedia/Reverse_Genetics (250 words)

	Reverse genetics - Wikipedia, the free encyclopedia
		Reverse genetics is an approach to discovering the function of a gene that proceeds in the opposite direction of so called forward genetic screens that are more usual in classical genetics.
		Classical and reverse genetics are alike since using either approach investigators try to deduce information from the effects of damaging or changing a genes function.
		In contrast, for reverse genetics, the goal is to identifying a known gene's phenotype.
	en.wikipedia.org /wiki/Reverse_genetics (768 words)

	[No title]
		Reverse genetics may be essential for a quick response to the bird flu.
		Reverse genetics allows researchers to assemble designer flu viruses, using biotechnology tools to remove viral traits that make a particular strain lethal, while retaining components that stir antibody responses from the human immune system.
		Reverse genetics converts the eight influenza RNA genes into DNA, which can be readily manipulated in the lab to add or remove traits.
	web.missouri.edu /~glaserr/current_news/Article_Reverse.html (1242 words)

	Molecular genetics - Wikipedia, the free encyclopedia
		Molecular genetics is the field of biology which studies the structure and function of genes at a molecular level.
		It is so-called to differentiate it from other sub fields of genetics such as ecological genetics and population genetics.
		An important area within molecular genetics is the use of molecular information to determine the patterns of descent, and therefore the correct scientific classification of organisms: this is called molecular systematics.
	en.wikipedia.org /wiki/Molecular_genetics (254 words)

	Reverse genetics - Encyclopedia, History, Geography and Biography
		Reverse genetics is an approach to discovering the function of a gene that proceeds oppositely to how such discoveries typically unfold in the so called forward genetic screens more usual in classical genetics.
		For reverse genetics phenotype, rather than the being the starting point, is the end point.
		Reverse genetics, Random deletions, insertions and point mutations, Directed deletions and point mutations, Gene silencing and Interference using transgenes.
	www.arikah.net /encyclopedia/Reverse_genetics (839 words)

	APS Education Center - Advance Topics - An Introduction to Reverse Genetic Tools for Investigating Gene Function (Site not responding. Last check: 2007-11-05)
		The toolbox for genetic research is expanding rapidly, and this overview presents a suite of tools generally referred to as reverse genetics that can be used to investigate gene function.
		The goal in reverse genetics is to investigate the impact of induced variation within a specific gene and to infer gene function.
		Chemical mutagenesis is attractive for reverse genetics because it results in induced point mutations, which create a diverse range of alleles for genetic analysis.
	www.apsnet.org /education/AdvancedPlantPath/Topics/ReverseGenetics/default.htm (3110 words)

	MedImmune Receives FDA Approval to Use Reverse Genetics Technology for FluMist(R) Vaccine Production - Health - RedOrbit (Site not responding. Last check: 2007-11-05)
		Use of reverse genetics (also known as "plasmid rescue") technology enhances the safety, specificity, reliability and efficiency with which new vaccine strains can be produced.
		"Reverse genetics represents an important breakthrough in commercial influenza vaccine processes by improving the efficiency of producing new influenza vaccine strains on an annual basis," said George W. Kemble, Ph.D., vice president, research and development, vaccines.
		Most influenza vaccine manufacturing companies and governmental agencies are now using reverse genetics technology in their development of pandemic vaccine candidates because it allows them to avoid working directly with the infectious, circulating pandemic strains.
	www.redorbit.com /news/health/561538/medimmune_receives_fda_approval_to_use_reverse_genetics_technology_for/index.html?source=r_health (1223 words)

	MedImmune, Inc. :: MedImmune Expands Patent Estate for Reverse Genetics with New Rights from Mount Sinai School of ... (Site not responding. Last check: 2007-11-05)
		Reverse genetics is a method of altering the influenza genome to produce vaccine seeds that are then used to produce the vaccine.
		Reverse genetics is an important breakthrough for manufacturing all influenza vaccines, because it is more efficient and reliable than current methods used to produce vaccine seeds.
		For pandemic vaccines, reverse genetics is even more important because it does not require vaccine manufacturers to work directly with the infectious, circulating pandemic strain, rather only segments of its genome.
	sev.prnewswire.com /null/20051207/NYW05507122005-1.html (1520 words)

	Reverse genetics in the mouse and its application to the study of deafness. (Site not responding. Last check: 2007-11-05)
		Reverse genetics in the mouse and its application to the study of deafness.
		Reverse genetics in the mouse and its application to the study of deafness.Genetic variants of the laboratory mouse can serve as useful models for hereditary deafness syndromes in humans.
		Genetic analyses have refined the position of sh-1 to a chromosomal interval between break points of deletions involving the closely linked albino (c) locus.
	www.pdg.cnb.uam.es /UniPub/iHOP/gp/7012067.html (220 words)

	Plasterk Group (Site not responding. Last check: 2007-11-05)
		The purpose of genetics is to understand the complexity of life in terms of the complexity of the genome, and one encounters that complexity inevitably.
		Forward genetic studies start with a clean and well defined phenotype, and end with genes of diverse mechanistic roles, so that difficult choices have to be made which genes to study.
		Reverse genetics on the other hand start with a well defined set of genes, and the difficult ch oice has to be made, which of the many aspects of phenotype will be studied once a mutant animal is obtained.
	www.niob.knaw.nl /researchpages/plasterk/transpins.html (7992 words)

	HHMI's BioInteractive - What is chemical genetics?
		The term chemical genetics indicates that the approach uses chemistry to generate the small molecules and that it is based on principles that are similar to classical genetic screens.
		In classical reverse genetics, scientists start with a gene of interest and try to find what it does by looking at the phenotype when the gene is mutated.
		In a genetic screen the activity of a protein is altered indirectly—by mutating its gene—but in chemical genetics this change is direct and occurs in real time (when the molecule is added).
	www.hhmi.org /biointeractive/genomics/poster_a2.html (1052 words)

	[No title]
		The purpose of genetics is to understand the complexity of life in terms of the complexity of the genome, and one encounters that complexity inevitably.
		Forward genetic studies start with a clean and well defined phenotype, and end with genes of diverse mechanistic roles, so that difficult choices have to be made which genes to study.
		Reverse genetics on the other hand start with a well defined set of genes, and the difficult choice has to be made, which of the many aspects of phenotype will be studied once a mutant animal is obtained.
	elegans.swmed.edu /Worm_labs/Plasterk/homepage/shakes.html (8517 words)

	Genetics Glossary QR (Site not responding. Last check: 2007-11-05)
		A cross, with the phenotype of each sex reversed as compared with the original cross, to test the role of parental sex on inheritance pattern.
		In genetic mapping studies an offspring having a non-parental allele combination.
		A class of genetic elements that includes retroviruses and transposons that have an intermediate RNA stage.
	helios.bto.ed.ac.uk /bto/glossary/qr.htm (1889 words)

	Plant Genetics
		Plant genetics uses inherited differences as clues to study plant metabolic pathways or processes such as color development, growth, or response to stress.
		Genetic research on inheritance of measurable traits that vary over a continuous range has more than doubled crop yield and greatly increased yield stability.
		Research on genetic variation in an entire population, or between different populations, is known as population genetics.
	www.csrees.usda.gov /nea/plants/in_focus/pbgg_if_genetics.html (201 words)

	Cellectis : Reverse Genetics
		One of the major tasks of genetics is to associate phenotypes with the corresponding mutated genes.
		It was this kind of genetics that was performed by people like Johann Gregor Mendel in the 19th century with peas, Thomas H. Morgan in the early 20th with Drosophila, and more recently, by Barbara McClintock with maize.
		But reverse genetics requires having a means to selectively mutate a chosen gene.
	www.cellectis.com /reverse.php (419 words)

	Genetics (Site not responding. Last check: 2007-11-05)
		Genetics is the science of genes, heredity, and the variation of organisms.
		Within organisms, geneticinformation generally is carried in chromosomes, where it is represented in the chemical structure of particular DNA molecules.
		A more recent development is the rise of genomics, which attempts the study of large-scale genetic patterns across the genome for (and in principle, all the DNA in) a given species.
	www.therfcc.org /genetics-3063.html (826 words)

	Duke University Department of Molecular Genetics & Microbiology (Site not responding. Last check: 2007-11-05)
		Using genetically tractable organisms and either forward or reverse genetic strategies, gene function can be dissected within the context of the whole organism.
		Toward this goal, the Center for Experimental Genetics was established to foster the use of genetic approaches in studies of both basic biological processes and disease pathogenesis.
		ENU mutagenesis) to identify novel genetic alterations involved in biological processes or disease — so called "forward genetics." Other research programs rely on a genotype-driven approach, using the tools of genetic technology to manipulate specific genes in a desired way (eg.
	mgm.duke.edu /genetics (377 words)

	Alkaptonuria - classical vs reverse Genetics
		From the pattern of inheritance (pedigree) observed in families under his care, the physician Garrod deduced that the metabolic disease alkaptonuria was inherited as a simple recessive trait, in the manner then recently described by Mendel, and suggested a biochemical basis (Steps 1-3).
		Garrod's analysis is classical Genetics: he observed the pattern of inheritance of the phenotype in order to infer the the nature of the biochemical genotype.
		The molecular analysis is "reverse Genetics": detailed study of the gene locus genotype shows how it produces a disease phenotype.
	www.mun.ca /biology/scarr/MGA2_Foundations_8-1.html (249 words)

	Reverse Process May Be Key To Developing Swine Flu Vaccine (Site not responding. Last check: 2007-11-05)
		The researchers, who work in NADC's Virus and Prion Diseases of Livestock Research Unit, are using reverse genetics to create new flu viruses in efforts to explore individual components of the virus.
		Reverse genetics has been developed over the past decade for virus studies.
		What made reverse genetics attractive for exploring the new swine flu strains is that manipulations commonly done on DNA cannot be performed with RNA.
	www.ars.usda.gov /is/AR/archive/feb04/flu0204.htm (878 words)

	glossary
		reverse genetics," is an approach that searches for linkage of a trait to markers in the DNA, and which requires no knowledge of what causes the illness.
		As described, these are genetic loci, which are readily identifiable by molecular techniques, and which show substantial sequence variation among people.
		The term "positional cloning" is truly appropriate since the information used to identify the chromosomal region of interest is based only on the positional information contributed by the DNA markers.
	www.nyu.edu /classes/ytchang/book/glossary/reverseap.htm (170 words)

	Molecular genetics Summary
		Molecular genetics is the field of biology which studies the structure and function of genes at a molecular level.
		It is so-called to differentiate it from other sub fields of genetics such as ecological genetics and population genetics.
		An important area within molecular genetics is the use of molecular information to determine the patterns of descent, and therefore the correct scientific classification of organisms: this is called molecular systematics.
	www.bookrags.com /Molecular_genetics (2023 words)

	Reverse genetics by chemical mutagenesis in Caenorhabditis elegans - Nature Genetics (Site not responding. Last check: 2007-11-05)
		Traditional reverse genetics on yeast, mice and other organisms uses homologous recombination with transgenic DNA to interrupt a target gene.
		Because it requires no transgenesis or cell culturing, it may also be applicable to small organisms usually considered to be outside the realm of reverse genetics (for example, other nematodes and insects).
		Plasterk, R.H.A. Reverse genetics: from gene sequence to mutant worm, in Caenorhabditis elegans: Modern Biological Analysis of an Organism (eds Epstein, H. and Shakes, D.C.).
	www.nature.com /doifinder/10.1038/ng0997-119 (409 words)

	MedImmune cleared to offer Flumist the reverse genetics treatment
		Reverse genetics technology, also known as "plasmid rescue," enhances the safety, specificity, reliability and efficiency with which new vaccine strains can be produced and so has the potential to transform the face of the vaccine manufacturing industry.
		In the conventional vaccine manufacturing method, which dates back to the 1960s, two flu strains with the preferred features for a new vaccine are injected into an egg and their genes reassort naturally.
		Nevertheless, reverse genetics will have no impact on the formulation of Medimmune's Flumist and how it is administered, which means there is no reason to expect FluMist's record of disappointing sales, overproduction and under-adoption to change as a result of the new technology.
	www.in-pharmatechnologist.com /news/ng.asp?n=69126-medimmune-flumist-caiv-t-reverse-genetics (693 words)

	Reverse Genetics in Mammals Using RNAi
		Reverse genetics studies gene function by targeted mutations and observation of the functional consequences.
		Since the early 1980s, reverse genetics in mammals have primarily relied upon gene knockouts in mice using homologous recombination technology.
		Third, gene knockout is not an ideal approach with which to generate disease models that require genetic hypomorphism, because standard gene knockouts often result in embryonic lethality in the homozygote and the absence of a phenotype in the heterozygote.
	www.cellscience.com /reviews9/Reverse_Genetics_RNAi.html (374 words)

	Classical genetics Summary
		The term classical genetics (also referred to as "forward genetics") came about in response to the term "reverse genetics" which is itself a product of the post-genomic era.
		Quite literally reverse to what is normally (and still) done in classical genetics, this is how classical genetics is now sometimes referred to as forward genetics.
		For instance, if one can show that a given transcription factor activated Gene X by using genetic mutants, this can be more clearly defined by showing conclusively that the promoter region of gene X (when fused to a reporter construct) is activated in the presence of that transcription factor.
	www.bookrags.com /Classical_genetics (1271 words)

	Fort Dodge Animal Health Announces Licensure of a Reverse Genetics Avian Influenza Vaccine
		Reverse genetics, a cutting-edge technology being utilized in the development of human vaccines, has enabled Fort Dodge to take components from three different influenza viruses and bring them together in a single product.
		The reverse genetics technology used for the preparation of the Fort Dodge H5 influenza vaccine was developed by Erich Hoffmann, Ph.D., Division of Virology, St. Jude Children’s Research Hospital.
		This process, known as the eight plasmid reverse genetics system, is a significant advantage for future poultry vaccines because it allows the antigen content to be standardized, according to Robert Webster, Ph.D., holder of the Rose Marie Thomas Chair, Department of Infectious Diseases, at St. Jude.
	www.wyeth.com /news?nav=display&navTo=/wyeth_html/home/news/pressreleases/2006/1145475366899.html (732 words)

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