Scientists Find 7% of Mouse Epigenetic Traits Defy Mendel’s Laws
Updated
Updated · SciTechDaily · Jun 19
Scientists Find 7% of Mouse Epigenetic Traits Defy Mendel’s Laws
2 articles · Updated · SciTechDaily · Jun 19
Summary
A federally funded mouse study found 522 cases—about 7% of tracked DNA-methylation inheritance patterns—in which epigenetic marks passed across generations without following classic Mendelian rules.
Three generations of mice revealed 54 “emergent” events in which offspring showed methylation patterns absent in both parents, suggesting some inherited traits can arise through mechanisms beyond DNA-sequence transmission alone.
The team also identified five additional imprinted genes and a naturally occurring mammalian paramutation in Capn11, a sperm-development gene whose human counterpart has been linked to infertility and sperm abnormalities.
Using long-read sequencing and joint genomic-methylation analysis, the researchers argue that inheritance studies may need to combine genomics with epigenomics, with planned follow-up work extending the approach to human data.
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7% of Mouse DNA Methylation Patterns Break Mendel’s Laws: New Study Redefines Genetic Inheritance
Overview
A major study published in May 2026 by Johns Hopkins University and Texas A&M University revealed that about 7% of DNA methylation patterns in mice do not follow Mendel’s classic laws of inheritance. Using advanced long-read DNA sequencing, researchers found that these epigenetic marks—chemical changes to DNA—can be inherited in ways that challenge traditional genetic rules. This discovery marks a turning point in genetics, showing that heredity is more complex than previously thought and raising new questions about how traits are passed down through generations.