Nonrandom distribution of methotrexate-induced aberrations on human chromosomes. Detection of further folic acid sensitive fragile sites
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Summary
This summary is machine-generated.Eleven folic acid sensitive fragile sites were identified, with some unique to individuals. This suggests inherent chromatin properties dictate chromosomal fragility and individual sensitivity to folic acid deficiency.
Area Of Science
- Human Genetics
- Cytogenetics
- Molecular Biology
Background
- Chromosomal fragile sites are specific regions prone to breakage.
- Folic acid is essential for DNA synthesis and repair.
- The genetic basis for individual variation in fragile site expression is not fully understood.
Purpose Of The Study
- To identify and characterize folic acid sensitive fragile sites.
- To investigate the individual-specific nature of these fragile sites.
- To explore the underlying mechanisms of chromosomal fragility.
Main Methods
- Analysis of chromosomal fragile sites in human cells.
- Induction of fragile sites using folic acid deficiency and specific agents like methotrexate and fluorodeoxyuridine.
- Comparative analysis of fragile site expression across individuals.
Main Results
- Eleven folic acid sensitive fragile sites were detected in one individual, with eight being novel.
- These sites exhibited specific sensitivities to folic acid deficiency.
- Fragile site 3p14 was present in all individuals, and homologous sites showed differential sensitivity to induced lesions, suggesting inherent chromatin properties.
Conclusions
- Folic acid sensitivity is an inherent property of individual chromosomal chromatin at fragile sites.
- This inherent property influences nonrandom fragility and individual sensitivity.
- The findings contribute to understanding the genetic basis of chromosomal instability.