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Published on: January 7, 2019
Target cell frequency is a genetically determined risk factor in radiation leukaemogenesis
M Jawad1, G Giotopoulos, C Cole
1Department of Genetics, University of Leicester, University Road, Leicester LE1 7RH, UK.
The British Journal of Radiology
|August 22, 2007
Summary
Radiation exposure increases leukemia risk. Studies show that the number of stem cells at risk, not just mutation rate, significantly impacts radiation-induced acute myeloid leukemia (r-AML) development.
Area of Science:
- Radiation biology
- Cancer genetics
- Hematopoiesis
Background:
- Ionizing radiation exposure elevates the risk of radiation-induced acute myeloid leukemia (r-AML).
- r-AML develops from accumulated mutations in hematopoietic stem cells, influenced by mutation rate and genetic susceptibility.
- While genetic factors are recognized, the role of target cell number in radiation leukaemogenesis is often overlooked.
Purpose of the Study:
- To review evidence from inbred mouse models demonstrating that target cell frequency is a significant risk factor in radiation-induced leukaemogenesis.
- To explore the relationship between genetic susceptibility loci, target cell frequency, and the development of radiation-induced acute myeloid leukemia (r-AML), thymic lymphoma (r-TL), and spontaneous plasmacytoma (PCT).
Main Methods:
- Analysis of genetic studies in inbred mouse models with varying susceptibility to radiation-induced r-AML and thymic lymphoma (r-TL).
- Exploitation of mouse strains differing in spontaneous TL and pristane-induced plasmacytoma (PCT) to identify susceptibility loci.
- Identification of quantitative trait loci (QTL) associated with the frequency of hematopoietic stem cells, progenitor cells, and mature blood cells.
Main Results:
- Inbred mouse strains exhibit significant differences in hematopoiesis, influencing the frequency of various blood cell types.
- Co-localization of QTL for malignancy risk and target cell frequency was observed across r-AML, r-TL, and PCT.
- This co-localization provides strong evidence that target cell frequency is a critical risk factor in radiation leukaemogenesis.
Conclusions:
- Target cell frequency is a crucial, yet often underestimated, risk factor in radiation-induced acute myeloid leukemia (r-AML).
- Genetic studies in mouse models reveal a significant interplay between susceptibility loci, target cell numbers, and the development of radiation-induced hematopoietic malignancies.
- Understanding target cell frequency is essential for a comprehensive assessment of radiation-induced cancer risk.
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