Information about Transition (genetics)
- Not to be confused with the evolutionary concept of a transitional fossil.
In genetics, a transition is a mutation changing a purine to another purine nucleotide (A <-> G) or a pyrimidine to another pyrimidine nucleotide (C <-> T). Approximately two out of every three single nucleotide polymorphisms (SNPs) are transitions.
They can be caused by oxidative deamination and tautomerization.[1]
5-Methylcytosine is more prone to transition than unmethylated cytosine, due to spontaneous deamination.
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Transitional fossils are the fossilized remains of transitional forms of life that illustrate an evolutionary transition. They can be identified by their retention of certain primitive (plesiomorphic) traits in comparison with their more derived relatives, as they are
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Purine (1) is a heterocyclic aromatic organic compound, consisting of a pyrimidine ring fused to an imidazole ring. Purines make up one of the two groups of nitrogenous bases. Pyrimidines make up the other group.
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For the programming language Adenine, see .
Adenine is a purine with a variety of roles in biochemistry including cellular respiration, in the form of both the energy-rich adenosine triphosphate (ATP) and the cofactors nicotinamide adenine
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Guanine is one of the five main nucleobases found in the nucleic acids DNA and RNA; the others being adenine, cytosine, thymine, and uracil. With the formula C5H5N5
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Pyrimidine is a heterocyclic aromatic organic compound similar to benzene and pyridine, containing two nitrogen atoms at positions 1 and 3 of the six-member ring.[1] It is isomeric with two other forms of diazine.
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Not to be confused with cysteine.
Cytosine is one of the five main nucleobases found in the nucleic acids DNA and RNA. It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an amine group at position 4 and
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5-methyluracil a pyrimidine nucleobase. As the name implies, thymine may be derived by methylation of uracil at the 5th carbon. In RNA thymine is replaced with uracil in most cases.
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single nucleotide polymorphism, or SNP (pronounced snip), is a DNA sequence variation occurring when a single nucleotide - A, T, C, or G - in the genome (or other shared sequence) differs between members of a species (or between paired chromosomes in an individual).
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single nucleotide polymorphism, or SNP (pronounced snip), is a DNA sequence variation occurring when a single nucleotide - A, T, C, or G - in the genome (or other shared sequence) differs between members of a species (or between paired chromosomes in an individual).
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Oxidative deamination is a form of deamination that generates oxoacids in the liver.
The presence of nitrous acid can cause transition mutations, by converting cytosine to uracil.
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The presence of nitrous acid can cause transition mutations, by converting cytosine to uracil.
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Tautomers are organic compounds that are interconvertible by a chemical reaction called tautomerization. As most commonly encountered, this reaction results in the formal migration of a hydrogen atom or proton, accompanied by a switch of a single bond and adjacent
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5-Methylcytosine is a methylated form of cytosine in which a methyl group is attached to carbon 5, altering its structure without altering its base-pairing properties.
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In vivo
5-Methylcytosine is an epigenetic modification formed by the action of DNA methyltransferases...... Click the link for more information.
Not to be confused with cysteine.
Cytosine is one of the five main nucleobases found in the nucleic acids DNA and RNA. It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an amine group at position 4 and
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Deamination is the removal of an amine group from a molecule.
In the human body, deamination takes place in the liver. It is the process by which amino acids are broken down. The amino group is removed from the amino acid and converted to ammonia.
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In the human body, deamination takes place in the liver. It is the process by which amino acids are broken down. The amino group is removed from the amino acid and converted to ammonia.
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In molecular biology, transversion refers to the substitution of a purine for a pyrimidine or vice versa[1]. It can only be reverted by a spontaneous reversion. Because this type of mutation changes the chemical structure dramatically, the consequences of this change
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