cytosine

[si´to-sēn]

a pyrimidine base found in nucleic acids.

cytosine arabinoside cytarabine.

cy·to·sine (Cyt),

(sī'tō-sēn),

A pyrimidine found in nucleic acids.

Farlex Partner Medical Dictionary © Farlex 2012

cytosine

(sī′tə-sēn′)

n. Abbr. C

A pyrimidine base, C₄H₅N₃O, that is the constituent of DNA and RNA involved in base-pairing with guanine.

cy·to·sine

(Cyt) (sī'tō-sēn)

A pyrimidine found in nucleic acids.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

cytosine

A pyrimidine base, one of those forming the genetic code of DNA and RNA.

Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Fig. 128 Cytosine . Molecular structure.

cytosine (C)

one of four types of nitrogenous bases found in DNA, having the single-ring structure of a class known as PYRIMIDINES. Cytosine forms part of a DNA unit called a NUCLEOTIDE and always forms complementary pairs with a DNA purine base called a GUANINE. Cytosine also occurs in RNA molecules.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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References in periodicals archive

To differentiate a set of statistically significantly methylated cytosine sites against potential technical randomness due to incomplete bisulfite conversion, the p values for the methylation state of both the DNA and RNA methylation are calculated by Fisher's exact test against the background conversion odds after the filtering of the sites mapped to introns and secondary structures.

Topological Characterization of Human and Mouse [m.sup.5]C Epitranscriptome Revealed by Bisulfite Sequencing

Frederick, "Cytosine-cytosine+ base pairing stabilizes dna quadruplexes and cytosine methylation greatly enhances the effect," Biochemistry, vol.

Effects of 5-Hydroxymethylcytosine Epigenetic Modification on the Stability and Molecular Recognition of VEGF i-Motif and G-Quadruplex Structures

Because purine bases and cytosine are found in both RNA and DNA, the concentrations of purine and cytosine are higher than that of uracil [17].

The relationship between odd- and branched-chain fatty acids and microbial nucleic acid bases in rumen

Detection of MUC1 -variable number tandem repeat single cytosine insertion

Genetic Testing of the mucin 1 gene-Variable Number Tandem Repeat Single Cytosine Insertion Mutation in a Chinese Family with Medullary Cystic Kidney Disease

To further confirm the cytosine methylation status at the EGFR c.2369 position, an independent sample cohort was tested by use of a different detection method, MS-HRM followed by pyrosequencing.

Reducing Artifactual EGFR T790M Mutations in DNA from Formalin-Fixed Paraffin-Embedded Tissue by Use of Thymine-DNA Glycosylase

Although the migration time CV values for five consecutive runs were 0.26% for cytosine, 0.20% for methylcytosine, and 0.30% for guanosine, respectively, the tailing of the cytosine peak indicated the presence of a contaminating element comigrating with Cyt.

Evaluation of Global Genomic DNA Methylation in Human Whole Blood by Capillary Electrophoresis UV Detection

The activation of the immune system, by consequence, begins with the recognition of the microorganisms by the macrophages with an activation pathway of the TLR2 and TLR4, leading to the apparition of inflammatory cytosines with the consequent expression of RANKL for the osteoclasts activation and survival mechanisms [5, 19].

GAKG-RGEKG an Epitope That Provokes Immune Cross-Reactivity between Prevotella sp. and Human Collagen: Evidence of Molecular Mimicry in Chronic Periodontitis

The results for Cytosine (C) agreed with that of Xia et al [25] and also for Cytosine (C), Thymine (T) and Adenine (A) with Xia et al [26] for samples of human plasma.

Gas Chromatographic Determination of Purines and Pyrimidines from DNA Using Ethyl Chloroformate as Derivatizing Reagent

These data indicated that full methylation of internal cytosine occurred most frequently in all the four types at CCGG context in the maize genome.

Epigenetic regulation during internode elongation of maize (Zea mays)

Methylation of cytosine to 5-methylcytosine (5-mC) is a major epigenetic event which interferes with the binding of proteins to DNA resulting in the exquisite control of gene expression and cell differentiation.

AnaSpec Now Offers 5-Hydroxymethyl Cytosine Monoclonal Antibody (Clone 4D9)

The formation of excimers is important not only to understand the distinct photophysics of oligonucleotides and DNA but also to account for the intrinsic and distinct photoinduced reaction of cytosine and thymine, which form CPDs.

Competing deactivation channels for excited [pi]-stacked cytosines

The genotypes B, C, D and E have thymine in nt 1858, F has cytosine or thymine and A generally has cytosine.

Hepatitis B virus in the State of Alagoas, Brazil: genotypes characterization and mutations of the precore and basal core promoter regions