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Ch. 15 - Gene Mutation, DNA Repair, and Transposition
Klug - Concepts of Genetics 12th Edition
Klug12th EditionConcepts of GeneticsISBN: 9780135564776Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoKlug 12th EditionCh. 15 - Gene Mutation, DNA Repair, and TranspositionProblema 12
Capitolo 15, Problema 12

Why are X rays more potent mutagens than UV radiation?

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Understand the nature of X rays and UV radiation in terms of their energy and wavelength. X rays have shorter wavelengths and higher energy compared to UV radiation.
Recognize that the higher energy of X rays allows them to penetrate deeper into biological tissues and cause more direct damage to DNA molecules.
Learn that X rays can cause ionization, which means they can remove tightly bound electrons from atoms, leading to breaks in the DNA strands (both single and double-strand breaks).
Contrast this with UV radiation, which primarily causes damage by inducing the formation of thymine dimers—covalent linkages between adjacent thymine bases—leading to distortions in the DNA structure but generally not causing strand breaks.
Conclude that because X rays cause more severe types of DNA damage (strand breaks and ionization) compared to the more localized damage caused by UV radiation, they are considered more potent mutagens.

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Types of Radiation and Their Energy Levels

X-rays are a form of ionizing radiation with higher energy than ultraviolet (UV) radiation. This higher energy allows X-rays to penetrate cells and tissues more deeply, causing more severe damage to DNA molecules compared to UV radiation.
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Types of Maternal Inheritance

Mechanisms of DNA Damage by Radiation

X-rays cause direct breaks in the DNA strands, including single- and double-strand breaks, which are difficult for the cell to repair. In contrast, UV radiation primarily induces thymine dimers, which distort the DNA but are generally easier for cellular repair mechanisms to fix.
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DNA Proofreading

Mutagenic Potency and Cellular Repair

The mutagenic potency of radiation depends on the extent and type of DNA damage and the efficiency of cellular repair systems. Because X-rays cause more complex and severe DNA damage, they have a higher chance of causing mutations that persist, making them more potent mutagens than UV radiation.
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Repair Pathways
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DNA damage brought on by a variety of natural and artificial agents elicits a wide variety of cellular responses involving numerous signaling pathways. In addition to the activation of DNA repair mechanisms, there can be activation of pathways leading to apoptosis (programmed cell death) and cell-cycle arrest. Why would apoptosis and cell-cycle arrest often be part of a cellular response to DNA damage?
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Contrast the various types of DNA repair mechanisms known to counteract the effects of UV radiation. What is the role of visible light in repairing UV-induced mutations?

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Mammography is an accurate screening technique for the early detection of breast cancer in humans. Because this technique uses X rays diagnostically, it has been highly controversial. Can you explain why? What reasons justify the use of X rays for such a medical screening technique?

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Describe a tautomeric shift and how it may lead to a mutation.

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Why are frameshift mutations likely to be more detrimental than point mutations, in which a single pyrimidine or purine has been substituted?

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Contrast and compare the mutagenic effects of deaminating agents, alkylating agents, and base analogs.

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