Johns Hopkins Finds 522 Non-Mendelian DNA Methylation Patterns in Mice, Challenging Classic Inheritance
Updated
Updated · The Brighter Side of News · May 30
Johns Hopkins Finds 522 Non-Mendelian DNA Methylation Patterns in Mice, Challenging Classic Inheritance
2 articles · Updated · The Brighter Side of News · May 30
Three generations of mice revealed 522 inherited DNA methylation patterns on non-sex chromosomes that did not follow classic Mendelian rules, accounting for about 7% of the epigenetic inheritance patterns tracked.
Oxford Nanopore long-read sequencing let researchers measure DNA sequence and methylation on the same molecules, helping distinguish allele-specific marks that short-read methods often miss.
The team also identified 54 emergent patterns in which offspring showed methylation states absent in both parents, plus at least 51 regions controlled by distant trans-acting factors.
One standout result was evidence of a naturally occurring paramutation in a mammal at the Capn11 gene, alongside two additional likely cases tied to IAP retroviral elements.
Published in Nature Genetics, the study suggests inherited traits and disease risk may require combined genomic and epigenomic analysis, though the work was limited to two mouse strains, two tissues and stable lab conditions.
If genes aren't the whole story, what is this 'epigenetic engine' that can predict and even cause disease?
How can children inherit biological traits that neither of their parents ever had?
Beyond Mendel: 2026 Nature Genetics Study Uncovers 522 Epigenetic Inheritance Events in Mice
Overview
A groundbreaking study published in May 2026 has fundamentally changed our understanding of heredity by showing that epigenetic patterns, specifically DNA methylation, can be inherited across generations in mice, independent of the DNA sequence. The research team identified 522 cases of non-Mendelian inheritance of these methylation patterns and used innovative experimental and computational methods to map both genetic and epigenetic data at the same time. DNA methylation, which adds a chemical group to DNA without changing its code, can turn genes on or off, revealing a new layer of inheritance that challenges classic genetic theories.