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Mutations

Mutations

Abnormal Proliferation

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...

Cancer Prevention

Cancer Prevention

Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
Some...

Mutations

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...

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...

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).

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Related Experiment Video

Updated: Jun 24, 2026

Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer

Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer

Published on: July 29, 2010

[Environmental carcinogens and p53 gene mutation].

Zhen Xu¹, Yinlong Jin

¹Institute for Environmental Health and Related Product Safety, Chinese Center for Disease Control and Prevention, Beijing 100021, China.

Wei Sheng Yan Jiu = Journal of Hygiene Research

|June 24, 2004

Summary

The p53 gene, a key tumor suppressor, is frequently altered by environmental carcinogens, influencing cancer development. Understanding these interactions is crucial for cancer prevention and therapy.

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Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer

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The Lambda Select cII Mutation Detection System

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Yeast As a Chassis for Developing Functional Assays to Study Human P53

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Area of Science:

Molecular Biology
Genetics
Oncology

Context:

The p53 gene is a critical tumor suppressor involved in vital cellular functions like DNA repair and apoptosis.
Environmental carcinogens are implicated in 60-90% of human cancers.
Carcinogen-induced mutations in the p53 gene vary based on the carcinogen and cancer type.

Purpose:

To review major environmental carcinogens that impact the p53 gene and protein.
To discuss the carcinogenic effects of these environmental agents on p53.
To highlight the role of p53 alterations in environmental carcinogenesis.

Summary:

This review focuses on environmental carcinogens and their effects on the p53 tumor suppressor gene and protein.
It details how various carcinogens induce specific p53 mutations, contributing to cancer etiology.
The article synthesizes current knowledge on the link between environmental exposures and p53 gene alterations.

Impact:

Provides insights into the mechanisms of environmental carcinogenesis.
Informs strategies for cancer prevention by identifying key environmental risk factors.
Contributes to understanding p53's role in diverse cancer types and its therapeutic implications.