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Identifying DNA Mutations in Purified Hematopoietic Stem/Progenitor Cells
Published on: February 24, 2014
ALDH2 mutations and defense against genotoxic aldehydes in cancer and inherited bone marrow failure syndromes
Anthony Yiu-Ho Woo1, Lina Jia1
1School of Life Sciences and Biopharmaceutics, Shenyang Pharmaceutical University, Shenyang, Liaoning 110016, China.
Abstract:
Reactive aldehydes, for instance, formaldehyde and acetaldehyde, are important endogenous or environmental mutagens by virtue of their abilities to produce a DNA lesion called interstrand crosslink (ICL). Aldehyde-metabolizing enzymes such as aldehyde dehydrogenases (ALDHs) and the Fanconi anemia (FA) pathway constitute the main defense lines against aldehyde-induced genotoxicity. Biallelic mutations of genes in any one of the FA complementation groups can impair the ICL repair mechanism and cause FA, a heterogeneous disorder manifested by bone marrow failure (BMF), congenital abnormality and a strong predisposition to cancer. The defective ALDH2 polymorphism rs671 (ALDH2*2) is a known risk and prognostic factor for alcohol drinking-associated cancers. Recent studies suggest that it also promotes BMF and cancer development in FA, and its combination with alcohol dehydrogenase 5 (ADH5) mutations causes aldehyde degradation deficiency syndrome (ADDS), also known by its symptoms as aplastic anemia, mental retardation, and dwarfism syndrome. ALDH2*2 and another pathogenic variant in the alcohol-metabolizing pathway, ADH1B1*1, is prevalent among East Asians. Also, other ALDH2 genotypes with disease-modifying potentials have lately been identified in different populations. Therefore, it would be appropriate to summarize current knowledge of genotoxic aldehydes and defense mechanisms against them to shed new light on the pathogenic effects of ALDH2 variants together with other genetic and environmental modifiers on cancer and inherited BMF syndromes. Lastly, we also presented potential treatment strategies for FA, ADDS and cancer based on the manipulation of aldehyde-induced genotoxicity.
Insights
Genotoxic aldehydes cause DNA damage, but aldehyde-metabolizing enzymes offer protection. ALDH2 variants increase cancer and bone marrow failure risks, necessitating new therapeutic strategies.
Area of Science:
- Biochemistry
- Genetics
- Toxicology
Background:
- Reactive aldehydes like formaldehyde and acetaldehyde are mutagens that form DNA interstrand crosslinks (ICLs).
- Aldehyde-metabolizing enzymes, including aldehyde dehydrogenases (ALDHs) and the Fanconi anemia (FA) pathway, are crucial for defense against aldehyde genotoxicity.
- Mutations in the FA pathway cause Fanconi anemia (FA), leading to bone marrow failure (BMF), congenital abnormalities, and cancer predisposition.
Purpose of the Study:
- To summarize knowledge on genotoxic aldehydes and their defense mechanisms.
- To elucidate the pathogenic effects of ALDH2 variants and other modifiers on cancer and inherited BMF syndromes.
- To present potential therapeutic strategies targeting aldehyde-induced genotoxicity.
Main Methods:
- Review of scientific literature on aldehyde genotoxicity, FA pathway, and ALDH2 variants.
- Analysis of genetic and environmental factors influencing aldehyde metabolism and DNA repair.
- Exploration of therapeutic interventions for FA, aldehyde degradation deficiency syndrome (ADDS), and associated cancers.
Main Results:
- The ALDH2 polymorphism rs671 (ALDH2*2) is a risk factor for alcohol-related cancers and promotes BMF and cancer in FA.
- Combined ALDH2*2 and ADH5 mutations cause aldehyde degradation deficiency syndrome (ADDS), presenting as aplastic anemia, intellectual disability, and dwarfism.
- ALDH2*2 and ADH1B1*1 variants are prevalent in East Asians, with other ALDH2 genotypes showing population-specific disease-modifying potential.
Conclusions:
- ALDH2 variants, in conjunction with other genetic and environmental factors, significantly impact cancer and inherited BMF syndromes.
- Understanding aldehyde-induced genotoxicity pathways is key to developing targeted treatments for FA, ADDS, and cancer.
- Manipulation of aldehyde metabolism and DNA repair pathways offers promising therapeutic avenues.
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