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Mutagenicity and Carcinogenicity

Mutagenicity and Carcinogenicity

Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...

Oxidations of Aldehydes and Ketones to Carboxylic Acids

Oxidations of Aldehydes and Ketones to Carboxylic Acids

Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...

Spontaneous and Induced Mutations

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).

Lethal Alleles

Lethal Alleles

Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...

Aldehydes and Ketones with Alcohols: Hemiacetal Formation

Aldehydes and Ketones with Alcohols: Hemiacetal Formation

Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound forms the hemiacetal or half acetal. As depicted below, in a hemiacetal, the carbon is directly linked to an OH and OR group.

Oxidation of Alcohols

Oxidation of Alcohols

In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:

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Aldehyde-Associated Mutagenesis─Current State of Knowledge.

Sriram Vijayraghavan¹, Natalie Saini¹

¹Department of Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, South Carolina 29425, United States.

Chemical Research in Toxicology

|June 26, 2023

Summary

Environmental aldehydes are genotoxic, damaging DNA and increasing cancer risk. This review details their DNA adducts and mutagenicity, crucial for understanding tumorigenesis.

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Area of Science:

Environmental Health
Molecular Toxicology
Genetics

Background:

Aldehydes are ubiquitous environmental contaminants from diverse sources like food, smoke, and industrial waste.
Exposure to aldehydes can lead to cellular damage, including DNA damage, protein cross-linking, and lipid peroxidation, increasing disease risk.
Genetic predisposition to aldehyde sensitivity exacerbates health outcomes, particularly in conditions involving impaired DNA repair pathways.

Purpose of the Study:

To review the genotoxic effects of environmental aldehydes.
To focus on DNA adducts responsible for aldehyde-induced mutagenicity.
To explore the role of aldehydes in tumorigenesis.

Main Methods:

Summarization of chemical structures of aldehydes and their DNA adducts.
Discussion of in vitro and in vivo methodologies for assessing aldehyde-associated mutagenesis.
Highlighting recent studies on aldehyde-associated mutation signatures and spectra.

Main Results:

Aldehydes form specific DNA adducts that underlie their mutagenic potential.
Various experimental approaches are available to measure aldehyde-induced mutagenesis.
Distinct mutation patterns are associated with aldehyde exposure.

Conclusions:

Aldehyde-associated mutagenicity is a significant area of research with implications for cancer development.
Understanding DNA adducts and mutation signatures is key to assessing aldehyde risks.
Further research is needed to address challenges and explore future perspectives in this field.