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Cytogenetic damage measured in human sperm following cancer chemotherapy
1School of Public Health, University of North Carolina at Chapel Hill, USA. robbins2@niehs.nih.gov
Abstract:
Germ-line cytogenetic damage is well documented in laboratory animals exposed to anti-cancer agents, but has been harder to verify in the human. This paper reviews published studies demonstrating cytogenetic damage in human sperm following exposure to anti-cancer chemicals, as measured by the human-sperm/ hamster-egg cytogenetic technique and fluorescence in situ hybridization. These two assays have provided important information on one step in the pathway leading to induced, transmissible germ line damage in the human. By way of introduction, a short review of the traditional human endpoints used to address the question of induced, transmissible genetic damage in human germ cells (mutation epidemiology) related to anti-cancer chemicals is presented.
Insights
Anti-cancer drugs can cause germ-line cytogenetic damage in humans. Studies using human-sperm/hamster-egg assays and fluorescence in situ hybridization confirm this damage in sperm, indicating a risk of heritable genetic effects.
Area of Science:
- Reproductive toxicology
- Human genetics
- Cancer research
Background:
- Germ-line cytogenetic damage is established in animal models exposed to anti-cancer agents.
- Verifying such damage in humans has been challenging.
- Traditional human endpoints for transmissible genetic damage are also reviewed.
Purpose of the Study:
- To review published studies on cytogenetic damage in human sperm after exposure to anti-cancer chemicals.
- To highlight the role of specific assays in assessing germ line damage.
- To provide context on established methods for evaluating induced genetic damage.
Main Methods:
- Review of published studies utilizing the human-sperm/hamster-egg cytogenetic technique.
- Review of published studies utilizing fluorescence in situ hybridization (FISH).
- Examination of mutation epidemiology data for anti-cancer chemical exposure.
Main Results:
- The human-sperm/hamster-egg assay and FISH have demonstrated cytogenetic damage in human sperm.
- These assays provide crucial data on early steps in induced germ line damage.
- Published data confirm the potential for anti-cancer agents to induce genetic damage in human germ cells.
Conclusions:
- Cytogenetic damage in human sperm following anti-cancer drug exposure is verifiable.
- Specific assays are valuable tools for assessing germ line damage risk.
- Further research is needed to fully understand the implications of induced, transmissible genetic damage in humans.