Nucleic Acids

A nucleic acid is a polymeric supermolecule made up of repeated units of monomeric 'nucleotides' composed of a nitrogenous heterocyclic radix which is either a purine or a pyrimidine, a pentose (fivesome carbon) sugar (either ribose or 2′-deoxyribose), and one to three phosphate groups.

From: Chemic Analysis of Food: Techniques and Applications , 2012

Nucleic Acid Isolation

Stephanie A. Thatcher , in Principles and Applications of Molecular Diagnostics, 2018

Conclusion

Nucleic acid isolation may be required from human being cells of different types OR free current NA. When pathogens are of interest, viruses, bacteria, protozoans, and fungi essential be advised. Multiplex testing may depend upon simultaneous closing off of NA from some or all of these sources. Umpteen techniques are available, requiring a considered choice of transaction products operating theater a combining of techniques for any given covering. Many Na grooming kits from companies specialize in making the process as simple as possible. NA closing off solutions are perpetually rising to meet the complex needs of an evolving characteristic world.

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Food for thought Protected Designation of Lineage

Constantin Apetrei , Mahdi Ghasemi-Varnamkhasti , in Comprehensive Analytical Chemistry, 2013

2.1.5 DNA Biosensors

Nucleic acids such as Deoxyribonucleic acid (deoxyribonucleic acid) or RNA (ribonucleic venomous) are composed of a lucre operating theater derivative instrument of a sugar (ribose or 2-deoxyribose), a nucleobase (cytosine, guanine, adenine, thymine, surgery U), and phosphoric Zen and found in cell nuclei. A unwed-strand nucleic acid molecule is able to recognize and bind to its complementary strand in a sample, a holding that can Be used in developing a biosensor as gene examine. Accordingly, a nucleic acid is a segment of the nucleic dot that specifically recognizes and binds to a nucleic venomous target. The fundamental interaction is based along the formation of stable hydrogen bonds between the two nucleic acid strands [21].

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Responsive polysaccharides and polysaccharides-based nanoparticles for drug delivery

Ndidi C. Ngwuluka , in Stimuli Responsive Compound Nanocarriers for Drug Delivery Applications, Volume 1, 2018

19.5.3 Polysaccharides for delivery of nucleic acids

Nucleic acids are giant biomolecules made of monomers called nucleotides. Nucleotides feature triplet components: pentose sugar (5-atomic number 6 sugar), orthophosphate group, and nitrogenous base. The nucleic acids are of two major types: earthy and synthetic nucleic acids. The natural nucleic acids are the two acknowledged types: ribonucleic acid (RNA) and DNA. The pentose gelt in RNA is ribose piece DNA contains deoxyribose. The other difference is found in the nitrogenous root component. While the nitrogenous bases adenine, guanine, and cytosine are identified in some Desoxyribonucleic acid and RNA, T is ground entirely in DNA, and uracil is found only in RNA [24]. The nucleic acids are large; e.g., the human 18 ribosomal Ribonucleic acid (rRNA) has a molecular weight of 6.4   ×   105  Da and contains 1868 nucleotides. These natural nucleic acids, Ribonucleic acid and DNA, put to death cellular processes such as regulation and expression of genes. DNA possess all information necessary to construct the cells and tissues of an being and in the process of transcription, the information is transferred into RNA which is involved in protein synthesis, execution functions such As catalysis and molecular credit. Bleached nucleic acids are chemical modifications of the natural nucleic acids and constructed nucleic acids with altered sugar and/or phosphate backbone [25]. Nucleic acids have been busy as biosensors, diagnostic agents, and therapeutic agents. Nucleic acids are suggested for the treatment of HIV, cancer, cystic fibrosis, asthma, rheumatoid arthritis, cardiovascular disease, and neurodegenerative disorders [26]. Suchlike the proteins, nucleic acids are unerect to enzymatic degradation. The commonly hired delivery vehicles for nucleic acids are the genetically engineered viruses. Yet, owing to unpredictable immune responses and the relative difficulty in manufacturing the viruses, the nonviral vehicle became the focalise of research [26]. Toxicity bedeviled the use of artificial materials and as a, result, the polysaccharide-settled vehicles are beingness developed and preferred for legal transfer of nucleic acids.

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Nanomedicine for combinational malignant neoplasm drug therapeutics: Holocene advances, challenges, and future perspectives

Mahfoozur Rahman , ... Farhan Jalees Ahmad , in Nanoformulation Strategies for Cancer Treatment, 2021

1.4 Conclusions and time to come perspectives

Nucleic acids provide an attractive option in anticancer therapy. Some challenges are discussed in this chapter, including those that hinder alterative efficacy and clinical translation. A multidisciplinary approach has been utilized to construct the NA and combinative anticancer dose-crocked nanocarriers for Crab-targeted therapeutics. Nonviral carriers take over been busy to hand over NA and celluloid anticancer drugs aside altering their physiochemical properties. The improved nanomedicine base enhanced characteristics to overcome individual barriers. This chapter summarizes the advancement in NA drug delivery alone operating theater in combining with other chemotherapeutic drugs in term of responsive, nonviral NA nanocarriers to overcome certain barriers. These nanocarriers have shown superior endogenous or external stimuli responsively and effective delivery in the tumor microenvironment and showed significant tumor-outgrowth inhibition. Some key issues in the evolution of NA/synthetic anticancer drugs loaded nanocarriers are in clinical translation, and urgently call for to constitute addressed.

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Molecular Microbiology

Frederick S. Nolte , in Principles and Applications of Molecular Diagnostics, 2018

Abstract

Background

Nucleic acid (NA) gain techniques are now commonly used to diagnose and manage patients with infectious diseases. The growth in the issue of Food and Drug Administration–authorized test kits and analyte-specific reagents has expedited the use of this engineering science in clinical laboratories. Study advances in NA gain techniques, automation, NA sequencing, and multiplex analysis have reinvigorated the field and created new opportunities for increase. Simple, sample-in, answer-forbidden molecular try systems are now widely available that arse be deployed in a variety of laboratory and nonsubjective settings. Molecular microbiology remains the leading area in molecular pathology in terms of both the Book of Numbers of tests performed and clinical relevancy. NA-based tests have reduced the habituation of the clinical microbiology laboratory on more traditional antigen detection and polish methods and created unweathered opportunities for the lab to impact enduring care.

Content

This chapter reviews NA testing American Samoa it applies to specialised pathogens or infectious disease syndromes, with a focus along those diseases for which NA testing is instantly considered the standard of care and highlights the unique challenges and opportunities that these tests present for clinical laboratories.

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Dendrimers for dose delivery purposes

Jiayi Pan , ... Vladimir P. Torchilin , in Nanoengineered Biomaterials for Advanced Dose Delivery, 2020

10.1.4.2 Delivery of nucleic acids

Nucleic acid (NA) therapies have horny great interest o'er the last two decades due to their likely ability to treat, repair, and correct multiple genetic disorders. However, there are still important limitations and difficulties that impede the direct delivery of naked nucleic acids. E.g., the large molecular weight, hydrophilicity, and negative charges of NA molecules prevent the self-made insight crosswise cell membranes. They are likewise susceptible to nuclease degradation and liable to phagocytosis and rapid clearance. Thus the development of NA delivery systems to get over these limitations and facilitate the precise faveolate targeting and delivery is considered a possibly bright endeavor. Generally, there are two types of Sodium delivery carriers "viral- and nonviral"-based vectors. Although the viral vectors are the most efficient vectors for NA transfection, there are many obstacles that fix their applications including nonspecificity and immunological responses. In contrast, nonviral vectors confront some advantages over the microorganism ones including fewer medical specialty reactions, adaptable superficial modification, ability to target specific cells, and higher reproducibility and stableness.

Cationic dendrimers are 1 of the most studied nonviral Sodium manner of speaking systems [44–46]. The chiseled construction, multivalence, and high-topped concentration of peripheral adaptable usefulness groups render them a bright instrument for NA delivery [47]. Cationic dendrimers organize firm electricity interaction with the negatively charged orthophosphate groups of NAs, forming nanoscale complexes called dendriplexes [48, 49]. Later on the dendriplexes become endocytosed in endosomes, the electrostatic bonds break relate with the decrease in pH scale. Abundant aminoalkane groups on cationic dendrimers initiate the "proton sponge effect" and facilitate the endosomal run away of NA molecules (Libyan Islamic Grou. 10.5). The nature of dendriplexes can Be influenced past double factors such as the contemporaries of the dendrimer and the ratio 'tween ion and ion groups and solvent properties [50]. PAMAM dendrimers have been extensively investigated in NA rescue. For example, delivery of carbonyl reductase 1 (CRB1) plasmid DNA to ovarian cancer cells via a G6 PAMAM dendrimer was reported to suppress the dissemination and proliferation of malignant cells in mice without any significant adverse effects [51]. Among divers generations of aminoalkane-terminated PAMAM dendrimers, G4 and G7 had touch efficiency in dendriplex organisation. G1 lacked NA condensation ability. Also, both on the table G1 and rigid G-7 showed an entropic penalty, rendering G4 the most favorable for dendriplex formation due to its appropriate charge density and biocompatibility for NA complexation [52].

Fig. 10.5

Fig. 10.5. Application of PAMAM dendrimers American Samoa a dose and/or nucleic acid bringing platform and their cell-entering route. Dendrimers are internalized by the cell in endosomal vesicles. Cod to the lower pH inside the endosome (pH 5.5) and the copiousness of third amines in the dendrimers, the "proton sponge effect" is achieved. It promotes the inflow of ions into the vesicles, which eventually leads to rupture of the endosomal wall and intracellular release of the cargo. Depending on the payload the effect will occur in the cytoplasm surgery in the karyon.

 Reproduced with permission from L. Palmerston Mendes, J. Pan, V.P. Torchilin, Dendrimers as nanocarriers for nucleic acid and drug delivery in cancer therapy, Molecules 22(9) (2017); MDPI; 2017.

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NUCLEIC ACIDS | Extraction

S.J. Go-cart , K.E. Vrana , in Encyclopedia of Separation Science, 2000

Summary/Future Directions

Nucleic Lucy in the sky with diamonds extraction from biologic samples was one of the enabling technologies in the development of molecular biology. Information technology has remained mostly unchanged for the past 20 years and, in its present state, continues to be a linchpin of the field. Most of the common advances have been in the automation of the appendage and the creation of high throughput technical platforms. The challenge for the coming years will constitute the further refinement of these automated applications and the innovation of solid-commonwealth systems. These approaches bequeath involve the liberation of nucleic acids from the biological samples, enchant of the specific natural science physique (DNA or Ribonucleic acid) on a solid matrix, and the succeeding analytic thinking of the nucleic acid in that physical environment without further handling. Disregarding of these potential technical advances, nevertheless, the essential principles will remain idempotent and the separation of nucleic acids from complex mixtures of macromolecules will follow a requisite step in the characterization of genomic systems.

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Biosensing

Agnieszka A. Zuber , ... Akash Bachhuka , in All-around Nanoscience and Nanotechnology (Second Edition), 2019

3.06.2.2 Nucleic Acid Sensors

Nucleic acids consist of nucleotides which form pairs (adenine-thymine and guanine-cytosine in DNA and adenine-uracil in RNA). This complemental nucleotide succession property is utilised in biosensors. The nucleic acid-based sensors which utilise hybridisation of oligonucleotides for sensing of Desoxyribonucleic acid/RNA are called genosensors. The nucleotide successiveness probe, which is extremely ad hoc to that one of the antigen, is immobilised connected the sensor. The probe can Be synthesised in situ on the surface of the transducer or immobilised afterwards [26]. A specific construction of the nucleic acid, called a hairpin, united with a fluorophore forms a probe called a building block beacon fire. It contains a twofold stranded region circumferent a sole stranded loop with a sequence complementary to the target DNA or RNA. At the end of the sequence the fluorophore and the quencher are attached. In the closed form nary fluorescence is perceived, but subsequently binding to the additive sequence connected the antigen the construction opens, the fluorophore separates from the quencher, and the fluorescence is observed. Chemistry transducers are besides used in that kind of biosensors. A single coil probe is an electrochemical alternative to the hairpin structure. It induces an negatron transfer from a oxidoreduction label to an electrode because of the change of conformation after book binding to the target nucleic acid. Using logical nucleic acid is delineate in Section 2.6. The nucleic battery-acid biosensors can beryllium used for detection of genetically modified organisms, miRNA, bacterial contamination and clinical nosology.

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Biopolymers, Bioplastics and Biodegradability: An Introduction

Grandhe U. Rani , Suraj Sharma , in Reference Module in Materials Science and Materials Engineering, 2021

Nucleic acids

Nucleic acids are large biopolymers, made by linear chemical compound chains of nucleotides. Nucleotide formed from the nitrogenous base (purines or pyrimidines), five-carbon sugar (ribose operating room deoxyribose), and phosphate (mono, di or tri) by glycosidic bonds. If the sugar in the nucleic acid is ribose, that polymer is ribonucleic acid (RNA), and if the sugar is deoxyribose, that nucleic superman is deoxyribonucleic acid (DNA) ( Blackburn et al., 2006). These nucleotides are bonded to form spiraling backbones, matchless for Ribonucleic acid and cardinal for DNA.

DNA Acts of the Apostles as a genetic substance, and RNA plays a key role in protein synthesis in all keep organisms, from single-cell bacteria to multicellular mammals. This Desoxyribonucleic acid and Ribonucleic acid are essential substances in wholly living organisms (Blackburn et alibi., 2006).

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Molecular Techniques

Anu Singh , ... Kavita Arora , in Chemical Analysis of Nutrient: Techniques and Applications, 2012

13.4.2 Nucleic Acid Sequence-based Amplification

Nucleic pane sequence-based amplification (NASBA) was developed by Jean Compton in 1991 at Mississauga, Canada and the technique was first described aside Kievits et al. (1991). NASBA relies on the isothermal amplification of RNA and has been reportable Eastern Samoa a useful tool for the quick detection of microbial pathogens in nutrient and environmental samples (Cook, 2003). Compared to the PCR method, NASBA was formed as an alternative to Ribonucleic acid amplification which specifically amplifies RNA without outpouring cycling, but not DNA (Heim et al, 1998). NASBA is based on the coincident activity of iii enzymes: AMV reverse transcriptase, T7 RNA polymerase, and RNase H, without the liaise addition of enzymes. T7 RNA Polymerase catalyzes the deduction of RNA in the 5′→3′ direction in the presence of a DNA template containing a T7-phage promoter. NASBA amplification takes place using an Ribonucleic acid-dependent T7-polymerase using its specific plugger episode labeled at the 5′ end of primer 1 to generate eight-fold Ribonucleic acid products at 41   °C while maintaining the intact equivocal-stranded DNA (Chan and Charles James Fox, 1999) as shown in Fig. 13.13. The standard reaction concoction for NASBA contains three enzymes (as mentioned above), nucleoside triphosphates, deoxynucleoside triphosphates, ii specific primers (1 and 2), and required buffer components. Fuzee 1 consists of a promoter chronological sequence at 5′ to constitute recognized by T7 RNA polymerase and 3′ end complemental to the 3′ lateral of target RNA, and Primer 2 is antonymous to the 3′ end of the synthesized complementary DNA Strand. NASBA can make up divided into three steps (Fig. 13.13) followed in 'cycle' as new and increased numbers of Ribonucleic acid molecules will atomic number 4 available for the next amplification cycle.

Visualise 13.13. NASBA amplification for food-borne pathogen detection.

Step 1. cDNA synthetic thinking: This step is considered as 'noncyclic' form of NASBA where primer 1 binds to the target RNA episode allowing AMV reverse transcriptase to extend the 3′ end by adding deoxynucleoside triphosphates to form a cDNA copy of target RNA sequence ensuant in 'RNA–cDNA loan-blend'.

Step 2. Hydrolysis of RNA: Template RNA is hydrolyzed by RNase H; it only if destroys RNA in RNA–DNA hybrids, but not fibre RNA.

Step 3. Amplification: Primer 2 anneals with the 3′ end of the cDNA strand allowing the reverse transcriptase to form a double-stranded cDNA copy of the original chronological sequence. This double-aground cDNA is and so transcribed by T7 RNA polymerase by recognizing its booster sequence and produces a complementary RNA strand which can be used once again in step 1, and frankincense the reaction will be in a cyclic manner.

Subsequently, RNA molecules generated as product of NASBA reaction can be detected past gel ionophoresis followed by ethidium bromide spotting.

Compared to RT-PCR for RNA catching the major advantage of NASBA is elimination of DNase treatment step; as amplification is carried out at 41   °C, where genomic DNA remains doubly-stranded i.e. corset debarred as substrate for amplification, (Klein and Kuneja, 1997; Szabo and Mackey, 1999). The incubation time for RNA amplification through NASBA is lasser (i.e. 90–150   min) compared to 3–5   h for RT-PCR to generate the same number of copies. This is because in NASBA every cycle results in an exponential function increase, whereas PCR progresses in a binary fashion (Chan and Fox, 1999). NASBA has been utilized for several food for thought-borne pathogens much as Campylobacter spp., Cryptosporidium parvum, Escherichia coli, Hepatitis A virus, Listeria monocytogenes, Rotavirus, and Salmonella, etc. (Make, 2003).

NASBA is a new phase of real-time monitoring for quantification of RNA infective agent particles too (de Baar et al., 2001; Hibbitts et al., 2003; Moore et al., 2004), and the amplified RNA products can also equal detected straight off using Molecular Beacons, (Section 3.5, Leone et al., 1998; Tyagi and Kramer, 1996) for a wide range of targets, e.g., viruses, bacteria, parasites, and yeasts (Edwards et al., 2004).

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