Modifiers of epigenetic reprogramming show paternal effects in the mouse

Area of Science:

• Epigenetics and Developmental Biology
• Mammalian Genetics
• Transgenerational Inheritance

Background:

• Epigenetic information is increasingly recognized as heritable across generations in mammals.
• Extensive reprogramming occurs in gametes and early embryos, yet transgenerational epigenetic inheritance persists.
• Disruptions in parental gamete epigenetic establishment can impact offspring phenotypes, even in non-carriers of the mutation.

Purpose of the Study:

• To investigate whether disruptions in paternal epigenetic reprogramming affect offspring phenotypes in mice.
• To determine if the untransmitted paternal genotype influences offspring traits.

Main Methods:

• Utilizing mouse models with heterozygous mutations in reprogramming genes.
• Analyzing adult offspring for phenotypic changes, including transcription and chromosome ploidy.
• Comparing offspring phenotypes to assess paternal inheritance effects.

Main Results:

• Paternal inheritance of epigenetic disruptions led to observable phenotypic changes in adult offspring.
• Detected alterations in gene transcription patterns in affected offspring.
• Observed changes in chromosome ploidy in adult animals exposed to paternal epigenetic effects.

Conclusions:

• Paternal epigenetic effects, influencing offspring phenotype without direct inheritance of the mutation, occur in mammals.
• The untransmitted genotype of male parents can significantly impact the phenotype of their offspring.
• These findings suggest a novel mechanism of transgenerational influence in mammals.