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Ch. 14 - Gene Mutation, DNA Repair, and Transposition
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics16
- Ch. 2 - Mitosis and Meiosis28
- Ch. 3 - Mendelian Genetics37
- Ch. 4 - Modification of Mendelian Ratios53
- Ch. 5 - Sex Determination and Sex Chromosomes32
- Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement37
- Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes36
- Ch. 8 - Genetic Analysis and Mapping in Bacteria and Bacteriophages24
- Ch. 9 - DNA Structure and Analysis38
- Ch. 10 - DNA Replication29
- Ch. 11 - Chromosome Structure and DNA Sequence Organization22
- Ch. 12 - The Genetic Code and Transcription36
- Ch. 13 - Translation and Proteins27
- Ch. 14 - Gene Mutation, DNA Repair, and Transposition34
- Ch. 15 - Regulation of Gene Expression in Bacteria22
- Ch. 16 - Regulation of Gene Expression in Eukaryotes37
- Ch. 17 - Recombinant DNA Technology27
- Ch. 18 - Genomics, Bioinformatics, and Proteomics30
- Ch. 19 - The Genetics of Cancer21
- Ch. 20 - Quantitative Genetics and Multifactorial Traits37
- Ch. 21 - Population and Evolutionary Genetics45
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Klug 10th EditionCh. 14 - Gene Mutation, DNA Repair, and TranspositionProblema 9
Klug 10th EditionCh. 14 - Gene Mutation, DNA Repair, and TranspositionProblema 9Capitolo 14, Problema 9
Describe a tautomeric shift and how it may lead to a mutation.
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Define a tautomeric shift as a spontaneous chemical change in the structure of a nucleotide base, where the base temporarily changes to an alternative form called a tautomer. This involves the repositioning of protons and electrons, altering the hydrogen bonding properties of the base.
Explain that the common tautomeric shifts occur in the bases adenine, cytosine, guanine, and thymine, causing them to pair incorrectly during DNA replication. For example, a keto form might shift to an enol form, changing its base-pairing preference.
Describe how during DNA replication, if a base is in its rare tautomeric form, it can pair with the wrong complementary base (e.g., thymine in its enol form pairing with guanine instead of adenine).
Illustrate that this mispairing leads to the incorporation of an incorrect nucleotide in the newly synthesized strand, which, if not corrected by DNA repair mechanisms, becomes a permanent mutation after the next round of replication.
Summarize that tautomeric shifts are a source of spontaneous point mutations because they cause transient mispairing that can be fixed into the DNA sequence, potentially altering the genetic code.
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Tautomeric Shift
A tautomeric shift is a spontaneous chemical change in the structure of a nucleotide base, where it temporarily converts to an alternative form (tautomer) with different hydrogen bonding properties. This shift can alter base pairing during DNA replication, leading to mismatches.
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09:52
Spontaneous Mutations
Base Pairing and DNA Replication
During DNA replication, bases pair specifically (A with T, G with C). If a base undergoes a tautomeric shift, it may pair incorrectly, causing the DNA polymerase to incorporate the wrong nucleotide, which can result in a permanent mutation after subsequent replications.
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11:59Steps to DNA Replication
Mutation Formation
Mutations arise when incorrect base pairing caused by tautomeric shifts is not corrected by DNA repair mechanisms. These mismatches become fixed in the DNA sequence after replication, potentially altering gene function or regulation.
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10:48Mutations and Phenotypes
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