Zygotic chromosomal structural aberrations after paternal drug treatment
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Published on: December 16, 2016
Anne Marie Downey, Bernard Robaire1
1Departments of Pharmacology and Therapeutics and of Obstetrics and Gynecology, McGill University, Montreal, Quebec, Canada.
Abstract:
In recent years, the field of male-mediated reproductive toxicology has received growing attention. It is now well-established that many drugs, chemicals, and environmental factors can harm male germ cells by inducing DNA damage. Male germ cells have extensive repair mechanisms that allow detection and repair of damaged DNA during the early phases of spermatogenesis. However, during the later phase of spermiogenesis, when the haploid spermatids undergo chromatin condensation and become transcriptionally quiescent, their ability to repair damaged DNA is lost. [1] ,[2] It is also thought that the highly compacted chromatin of the sperm can protect DNA against damage. [3] Therefore, it is expected that late spermatids will be most susceptible to DNA damaging agents. Unrepaired or misrepaired damage in the germ cells leads to the generation of spermatozoa with DNA damage that can be transmitted to the next generation. Fortunately, the maternal DNA repair machinery is capable of recognizing and repairing, at least to some degree, damaged paternal DNA after fertilization in the zygote. Therefore, the efficiency of the maternal repair machinery will greatly influence the risk of transmitting paternal DNA damage to offspring. [4].
Insights
Environmental toxins can damage male germ cells, especially during later sperm development stages when DNA repair is limited. This paternal DNA damage may be passed to offspring, though maternal repair mechanisms offer some protection.
Area of Science:
- Reproductive Toxicology
- Spermatogenesis
- DNA Damage and Repair
Background:
- Male-mediated reproductive toxicology is an emerging field of study.
- Exposure to drugs, chemicals, and environmental factors can induce DNA damage in male germ cells.
- Germ cell DNA repair mechanisms are active during early spermatogenesis but lost during late spermiogenesis.
Purpose of the Study:
- To highlight the susceptibility of late spermatids to DNA damaging agents.
- To discuss the transmission of paternal DNA damage to offspring.
- To emphasize the role of maternal DNA repair in mitigating inherited damage.
Main Methods:
- Review of existing literature on male reproductive toxicology and DNA repair.
- Analysis of the stages of spermatogenesis concerning DNA repair capacity.
- Examination of paternal DNA damage transmission and maternal repair efficiency.
Main Results:
- Late spermatids are most vulnerable to DNA damaging agents due to diminished repair capacity.
- Unrepaired or misrepaired DNA damage in germ cells can result in damaged spermatozoa.
- Maternal DNA repair in the zygote can partially correct paternal DNA damage.
Conclusions:
- The later stages of spermiogenesis represent a critical window for DNA damage in male germ cells.
- Paternal DNA damage can be transmitted to offspring, posing a risk to reproductive health.
- Maternal repair efficiency is a key factor in determining the inheritance risk of paternal DNA damage.
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