RNA interference (RNAi) is the process of mRNA degradation that is induced by double-stranded RNA in a sequence-specific manner. RNAi has been observed in all eukaryotes, from yeast to mammals. The RNAi pathway is thought to be an ancient mechanism for protecting the host and its genome against viruses and rogue genetic elements that use double-stranded RNA (dsRNA) in their life cycles. They have also been shown to play a role not only in mRNA and dsRNA stability/degradation, but also in regulation of translation, transcription, chromatin structure, and genome integrity. In plants and animals, RNA silencing has been adapted to play a critical role in regulation of cell growth and differentiation using a class of small RNAs. In the RNA interference process, the dsRNAs get processed into 20-25 nucleotide (nt) small RNAs by an RNase III-like enzyme called Dicer. Then, the small RNAs assemble into endoribonuclease-containing complexes known as RNA-induced silencing complexes (RISCs), unwinding in the process. The small RNA strands subsequently guide the RISCs to complementary RNA molecules, where they cleave and destroy the cognate RNA (effecter step). Cleavage of cognate RNA takes place near the middle of the region bound by the siRNA strand. The small RNAs that provide target specificity to the silencing machinery includes short interfering RNAs (siRNAs), repeat-associated siRNAs (rasiRNAs), and microRNAs (miRNAs) and is distinguished by their origin. siRNAs are processed from dsRNA precursors made up of two distinct strands of perfectly base-paired RNA, while miRNAs originate from a single, long transcript that forms imperfectly base-paired hairpin structures. siRNAs were originally identified as intermediates in the RNAi pathway after induction by exogenous dsRNA; however, endogenous sources of siRNAs have now been recognized. The endogenous siRNAs are derived from repetitive sequences within the genome, and are termed repeat-associated siRNAs, or rasiRNAs. miRNAs were discovered through their critical roles in development and cellular regulation, and represent a large class of evolutionarily conserved RNAs. miRNAs have always been recognized as being of endogenous origin. RNA interference has emerged as a natural mechanism for silencing gene expression over the past decade. This ancient cellular antiviral response can be harnessed to allow specific inhibition of the function of any chosen target genes, including those involved in causing diseases such as cancer, AIDS, and hepatitis. It is already proving to be an invaluable research tool, allowing much more rapid characterization of the function of known genes. More importantly, the technology considerably bolsters functional genomics to aid in the identification of novel genes involved in disease processes. Last but not the least the technology can be harnessed as a novel therapeutic agent and is suitable for combating viral diseases, cancers and inflammatory diseases.
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Anyone who has ever put on those extra five pounds during vacation or during the holidays is forever searching for the perfect way to get rid of those pesky inches quickly. With all the dieting options on the market, how is it even possible to find the best otc diet pill out there?
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The best antiaging solution available today, is halting the causes of aging before they can affect your skin. While aging begins almost at birth and starts to become evident in the 20`s, there are three factors that determine the appearance of aging, collagen, elastin and fat padding under the skin.
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Uricinex, Herbal Patch Plus, Black Cherry Fruit Extract and Black Cherry Concentrate are the different herbal based formulae that come under the non prescription category of medicine. None of these medicines contain harsh chemicals that are harmful to the patients who consume these medicines. All these herbal supplements attempt to eliminate the root cause of gout syndrome through different herbs that are found in nature. To find out the effectiveness of these medicines and to find out which one is the best amongst them, we will have to analyse the effectiveness of each of the ingredients that are used in these medicines.
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Dentist anesthesia includes all options possible when using an anesthetic to either calm a patient who is anxious before a dental procedure, numb a targeted area to minimize pain, or completely sedate a patient which would minimize consciousness.
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Those who are prescribed to consume Darvocet should inform the doctor if they are allergic to any drug, or if they are having any kind of breathing disorder including asthma, having a history of alcohol/drug addiction, go through low blood pressure, abdominal/intestinal disorder, any disease related to the kidneys or liver, have a brain tumor or had a head injury, have curvature of the spine, or any kind of mental illness. Persons habituated to having more than three alcoholic beverages every day or those who have suffered cirrhosis of the liver may be unable to digest Darvocet because of the Acetaminophen content in it.
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We all believe that we live in a free country and benefit from a democracy. We also believe that the government and the president control America.
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A medical transcriptionist is a vital part of any doctor's team. Transcription duties may be performed in the office itself, at a special department set aside in a hospital, or may be outsourced to a reputable company which specializes in providing excellent service. It is the responsibility of a transcriptionist and the doctor to make sure a patient's records are up to date and accurate.
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There are many reasons a woman may choose to get breast implants- reconstruction or augmentation- and in making that decision, she must weigh the differences in saline and silicone.
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Breast implant surgery like any other surgical operation is something that should be thought about and taken under careful consideration. Many women elect to receive breast implants for many reasons.
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