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Related Concept Videos

Overview of DNA Repair02:25

Overview of DNA Repair

In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
Chemically...
Fixing Double-strand Breaks02:04

Fixing Double-strand Breaks

The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Fixing Double-strand Breaks02:04

Fixing Double-strand Breaks

The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
Nucleotide Excision Repair01:38

Nucleotide Excision Repair

DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Nucleotide Excision Repair01:08

Nucleotide Excision Repair

Overview

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Demonstration of the DNA Fiber Assay for Investigating DNA Damage and Repair Dynamics Induced by Nanoparticles
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Methods to determine DNA structural alterations and genetic instability.

Guliang Wang1, Junhua Zhao, Karen M Vasquez

  • 1Department of Carcinogenesis, University of Texas MD Anderson Cancer Center, Science Park-Research Division, Smithville, TX 78957, USA.

Methods (San Diego, Calif.)
|February 28, 2009
PubMed
Summary
This summary is machine-generated.

Non-B DNA structures, though linked to human diseases, remain poorly understood. This review examines methods for studying non-B DNA-induced genetic instability to clarify disease development mechanisms.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Genomics

Background:

  • Chromosomal DNA exists in various non-canonical (non-B) conformations.
  • Over 10 non-B DNA forms identified; many are mutagenic and linked to human diseases.
  • Mechanisms underlying non-B DNA-induced genetic instability are largely undefined.

Purpose of the Study:

  • To review current methodologies for investigating non-B DNA structure-induced genetic instability.
  • To discuss the advantages and disadvantages of each method.
  • To highlight the importance of understanding these mechanisms for human disease insights.

Main Methods:

  • Review of existing literature on methodologies.
  • Analysis of techniques used to study non-B DNA structures.
  • Discussion of experimental approaches and their limitations.

Main Results:

  • Identification and categorization of various methods for studying non-B DNA.
  • Evaluation of the strengths and weaknesses of each technique.
  • Synthesis of current knowledge on non-B DNA structure-induced genetic instability.

Conclusions:

  • Further research into non-B DNA-induced genetic instability mechanisms is crucial.
  • Understanding these structures will improve insights into DNA metabolism and disease.
  • Elucidating these mechanisms can advance human disease prevention and treatment strategies.