Male-mediated developmental toxicity

Area of Science:

• Reproductive Toxicology
• Developmental Biology
• Genetics

Background:

• Male-mediated developmental toxicity has been a recognized concern since the early 1990s.
• Historical awareness heightened due to reports linking paternal occupational exposures to childhood leukemia.
• Both human and animal studies have informed the understanding of paternal effects on offspring development.

Purpose of the Study:

• To review and synthesize current knowledge on male-mediated developmental toxicity.
• To highlight the evolving understanding of sperm's role in transmitting parental exposures.
• To emphasize the complex genetic and epigenetic mechanisms involved.

Main Methods:

• Review of historical human and animal studies on paternal exposure effects.
• Inclusion of recent molecular findings on sperm components (histones, protamines, RNA).
• Consideration of epidemiological data and molecular approaches to assess transmitted damage.

Main Results:

• Animal studies indicated potential transmission of genetic damage from paternal radiation/chemical exposure.
• Sperm chromatin structure, histone retention, protamine incorporation, DNA methylation, and RNA transcripts are implicated.
• Recent molecular studies confirm transmission of DNA damage from smoking fathers and radiation-exposed fathers (Chernobyl).

Conclusions:

• Paternally transmitted damage to offspring is a complex phenomenon.
• It involves both direct genetic alterations and epigenetic modifications.
• Understanding these mechanisms is crucial for assessing risks associated with paternal exposures.