Related Experiment Video
Updated: Mar 24, 2026

Author Spotlight: Genetic Profiling for Fluorouracil Response in Gastric Cancer
Published on: May 10, 2024
Association between three exonuclease 1 polymorphisms and cancer risks: a meta-analysis
Zi-Yu Chen1, Si-Rong Zheng2, Jie-Hui Zhong1
1Department of Clinical Medicine, The First Clinical Medical College, Southern Medical University, Guangzhou, People's Republic of China; Institute of Genetic Engineering, School of Basic Medical Sciences, Southern Medical University, Guangzhou, People's Republic of China.
Exonuclease 1 (Exo1) Pro757Leu polymorphism may reduce cancer risk, while Glu589Lys may increase it, especially in smokers. The Glu670Gly polymorphism shows no significant cancer risk association. Further research is needed for definitive conclusions.
Area of Science:
- Genetics
- Oncology
- Molecular Biology
Background:
- Exonuclease 1 (Exo1) plays a crucial role in DNA repair pathways.
- Previous studies on Exo1 polymorphisms and cancer risk have yielded conflicting results.
- Understanding these associations is vital for cancer risk assessment.
Purpose of the Study:
- To conduct a meta-analysis on the association between three key Exo1 polymorphisms (Pro757Leu, Glu589Lys, Glu670Gly) and cancer susceptibility.
- To consolidate existing evidence and provide a more robust assessment of these genetic variations in relation to cancer risk.
- To investigate potential modifying effects, such as smoking status, on these associations.
Main Methods:
- Systematic literature search of PubMed and EMBASE databases for studies published before August 5, 2015.
- Inclusion of 16 eligible publications encompassing 10 studies (Pro757Leu), 12 studies (Glu589Lys), and 7 studies (Glu670Gly).
- Meta-analysis using pooled odds ratios and 95% confidence intervals, analyzed with STATA version 12.0.
Main Results:
- The Pro757Leu polymorphism was significantly associated with a reduced cancer risk.
- The Glu589Lys polymorphism showed an inverse association with overall cancer risk but a significant increase in cancer risk among smokers.
- No significant association was found between the Glu670Gly polymorphism and cancer risk.
Conclusions:
- The Exo1 Pro757Leu polymorphism may confer a protective effect against cancer.
- The Exo1 Glu589Lys polymorphism may act as a risk factor for cancer, particularly in smokers.
- The Exo1 Glu670Gly polymorphism appears to have no significant influence on cancer susceptibility, warranting further large-scale studies.
More Related Videos
08:15gDNA Enrichment by a Transposase-based Technology for NGS Analysis of the Whole Sequence of BRCA1, BRCA2, and 9 Genes Involved in DNA Damage Repair
Published on: October 6, 2014
08:53Identifying the Effects of BRCA1 Mutations on Homologous Recombination using Cells that Express Endogenous Wild-type BRCA1
Published on: February 17, 2011
Related Concept Videos
Nucleotide Excision Repair
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 Repair
Single Nucleotide Polymorphisms-SNPs
Non-LTR Retrotransposons
Pharmacogenetic Phenotypes: Alterations in Pharmacokinetics, Drug Targets and Biologic Milieu
Pharmacogenetics of Drug Targets: β₂-Adrenergic Receptors, Apo E, Thymidylate Synthase