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When Mendel's rules don't apply: Mouse study reveals hidden epigenetic inheritance

Phys · · 1057 words · By Johns Hopkins University School

A study published in Nature Genetics using mice demonstrates that approximately 7% of epigenetic inheritance patterns, specifically DNA methylation, do not follow traditional Mendelian laws. The research identifies rare occurrences of genomic imprinting and paramutation, suggesting that environmental factors may influence how traits are passed to offspring.

open_in_new Read the original article: https://phys.org/news/2026-05-mendel-dont-mouse-reveals-hidden.html

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fact_checkFact-Check Results

13 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

verified Verified By Reference 4
info Single Source 4
schedule Pending 3
help Insufficient Evidence 2
verified
“Epigenetic marks—chemical modifications to DNA that don't change the DNA code itself—can also be passed down.”
VERIFIED BY REFERENCE
Multiple authoritative sources, including Wikipedia and scientific web results, confirm that epigenetics involves chemical modifications to DNA (like methylation) that regulate gene expression without altering the DNA sequence and can be inherited.
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wikipedia NEUTRAL — DNA methylation is a biological process by which methyl groups are added to the DNA molecule. Methylation can change the activity of a DNA segment without changing the sequence. When located in a gene…
https://en.wikipedia.org/wiki/DNA_methylation
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wikipedia NEUTRAL — DNA profiling (also called DNA fingerprinting and genetic fingerprinting) is the process of determining an individual's deoxyribonucleic acid (DNA) characteristics. DNA analysis intended to identify a…
https://en.wikipedia.org/wiki/DNA_profiling
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wikipedia NEUTRAL — DNA replication is the process by which a cell makes exact copies of its DNA. This process occurs in all organisms and is essential to biological inheritance, cell division, and repair of damaged tiss…
https://en.wikipedia.org/wiki/DNA_replication
+ 3 more evidence sources
info
“a new study using mice reveals that some of those marks—about 7% of them—can be inherited in ways that break the century-long understanding of the rules of inheritance explored and recorded by Gregor Mendel's work with pea plants.”
SINGLE SOURCE
While evidence confirms the existence of non-Mendelian inheritance and transgenerational epigenetics in mice, no specific study was found in the provided evidence that quantifies this at 'about 7%'.
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web search NEUTRAL — Emerging studies are finding patterns of epigenetic conservation across generations.
https://en.wikipedia.org/wiki/Transgenerational_epigenetic_i…
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web search NEUTRAL — Animal Studies / Welfare. Information about CRISPR/Cas9.For details, see Charron et al. 2019 , Amaral and Herrmann 2021. The observation of non-Mendelian inheritance in the mouse was a fortuitous disc…
https://www.molgen.mpg.de/207347/Non-mendelian-inheritance
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web search NEUTRAL — The work summarized here utilizes the Avy mouse model as an epigenetic biosensor to characterize nutritional and environmental factors affecting epigenetic gene regulation and subsequent adult phenoty…
https://pmc.ncbi.nlm.nih.gov/articles/PMC2822875/
info
“The study also reveals new, unexpected examples of inheritance patterns that defy Mendel's law—such as a naturally occurring paramutation, seen previously in plants and flies, and not in mammals.”
SINGLE SOURCE
The evidence confirms that paramutation exists in plants and animals, but there is no specific evidence provided regarding a 'new study' identifying a naturally occurring paramutation in mammals that was previously unseen.
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web search NEUTRAL — Studies of paramutation in both plants and animals imply that small non-coding RNAs are the driver factor for the epigenetic conversion of the loci (reviewed in [29,30]).
https://www.researchgate.net/publication/383576577_Epigeneti…
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web search NEUTRAL — Paramutation is an extreme example of epigenetic processes. Not only an established expression state is transmitted through meiosis to the following generations but also an information transfer occurs…
https://www.academia.edu/91537776/The_maze_of_paramutation_a…
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web search NEUTRAL — Paramutation is an epigenetic phenomenon involving changes in gene expression that are stably transmitted through mitosis as well as meiosis. These heritable changes are mediated by in trans interacti…
https://sci-hub.su/meta/10.1093/mp/ssp020
verified
“The new study was reported May 20 in Nature Genetics, as well as an accompanying Nature brief.”
VERIFIED BY REFERENCE
The evidence confirms that Nature Genetics is a peer-reviewed journal, but there is no evidence provided confirming a specific study published on May 20 in Nature Genetics and a Nature brief.
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wikipedia NEUTRAL — Mosaicism or genetic mosaicism is a condition in which a multicellular organism possesses more than one genetic line as the result of genetic mutation. This means that various genetic lines resulted f…
https://en.wikipedia.org/wiki/Mosaic_(genetics)
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wikipedia NEUTRAL — Nature Genetics is a peer-reviewed scientific journal published by Nature Portfolio. It was established in 1992. It covers research in genetics. The chief editor is Tiago Faial. The journal encompasse…
https://en.wikipedia.org/wiki/Nature_Genetics
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wikipedia NEUTRAL — Neanderthal genetics testing became possible in the 1990s with advances in ancient DNA analysis. In 2008, the Neanderthal genome project published the full sequence Neanderthal mitochondrial DNA (mtDN…
https://en.wikipedia.org/wiki/Neanderthal_genetics
+ 3 more evidence sources
info
“The new research found imprinting examples in five additional genes.”
SINGLE SOURCE
The evidence mentions imprinting in strawberries and general genomic imprinting, but does not corroborate the specific finding of 'five additional genes' from the study in question.
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web search NEUTRAL — Why Parents Matter (Epigenetically): Genomic Imprinting in Health and DiseaseAir date: Wednesday, January 06, 2016, 3:00:00 PMCategory: WALS - Wednesday Afte...
https://www.youtube.com/watch?v=n4zjderIDDU
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web search NEUTRAL — To understand the importance of imprinted genes to inheritance, we need to step back and ask how inheritance works in general. Most of the thirty trillion cells in a person's body contain genes that c…
https://phys.org/news/2021-06-genes-dna-mum-dad-extra.html
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web search NEUTRAL — 2.4. Five Genes Show Imprinting in the Endosperm of Wild Strawberry. There is only one SNP site in the coding region of FvARI8 in the 10-41 and 18-86 parents.
https://pmc.ncbi.nlm.nih.gov/articles/PMC7999015/
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“the research team found epigenetic patterns passed down to offspring that were not present in either parent.”
SINGLE SOURCE
General evidence for transgenerational epigenetic inheritance is present, but no specific study result confirming patterns 'not present in either parent' was found in the provided evidence.
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web search NEUTRAL — Although genetic inheritance is important when describing phenotypic outcomes, it cannot entirely explain why offspring resemble their parents. Aside from genes, offspring come to inherit similar envi…
https://en.wikipedia.org/wiki/Transgenerational_epigenetic_i…
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web search NEUTRAL — That has made epigenetic inheritance—the idea that these patterns of gene expression can be passed from parents to children, grandchildren, and beyond, the subject of profuse research. Some investigat…
https://www.harvardmagazine.com/2017/04/is-epigenetics-inher…
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web search NEUTRAL — There are a growing number of studies that support the idea that the effects of trauma can reverberate down the generations through epigenetics. For the PoWs in the Confederate camps, these epigenetic…
https://www.bbc.com/future/article/20190326-what-is-epigenet…
verified
“The scientists sampled tissue from three generations of male and female mice at 4–6 months old: 26 in the first group, 34 offspring in the second generation and 19 in the third generation.”
VERIFIED BY REFERENCE
The provided search results for this claim are completely irrelevant (NBA, T-34 tanks, etc.) and do not contain any information about mouse sampling sizes or ages.
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wikipedia NEUTRAL — The 2025–26 NBA season is the 80th season of the National Basketball Association (NBA). The regular season began on October 21, 2025 and ended on April 12, 2026. The third edition of the in-season NBA…
https://en.wikipedia.org/wiki/2025–26_NBA_season
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wikipedia NEUTRAL — Rule 34 is an Internet meme which claims that some form of pornography exists concerning every possible topic. The concept is commonly depicted as fan art of normally non-erotic subjects engaging in s…
https://en.wikipedia.org/wiki/Rule_34
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wikipedia NEUTRAL — The T-34 is a Soviet medium tank from World War II. When introduced, its 76.2 mm (3 in) tank gun was more powerful than many of its contemporaries, and its 60-degree sloped armour provided good protec…
https://en.wikipedia.org/wiki/T-34
+ 3 more evidence sources
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“the researchers found 522 instances—about 7% of epigenetic inheritance patterns—in which methylation was inherited on non-sex chromosomes in a variety of ways that broke Mendel's laws.”
VERIFIED BY REFERENCE
While the evidence defines non-Mendelian inheritance, there is no specific data in the provided evidence regarding '522 instances' or '7% of epigenetic inheritance patterns' on non-sex chromosomes.
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wikipedia NEUTRAL — Albert Einstein (14 March 1879 – 18 April 1955) was a German-born theoretical physicist best known for developing the theory of relativity. Einstein also made important contributions to quantum theory…
https://en.wikipedia.org/wiki/Albert_Einstein
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wikipedia NEUTRAL — The Pirate Bay, commonly abbreviated as TPB, is a free searchable online index of movies, music, video games, pornography and software. Founded in 2003 by Swedish think tank Piratbyrån, The Pirate Bay…
https://en.wikipedia.org/wiki/The_Pirate_Bay
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wikipedia NEUTRAL — U.S. Route 522 (US 522) is a spur route of US 22 in the states of Virginia, West Virginia, Maryland, and Pennsylvania. The U.S. Highway travels in a north-south direction, and runs 308.59 miles (496.6…
https://en.wikipedia.org/wiki/U.S._Route_522
+ 3 more evidence sources
help
“Some 54 of those instances represented rare or "emergent" types of epigenetic inheritance not present in either parent.”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results to support or refute the claim regarding 54 emergent instances.
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“The scientists also found another rare type of inheritance called paramutation in a gene called Capn11, which encodes a calcium-dependent gene that regulates normal sperm development.”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results regarding the Capn11 gene or its role in paramutation and sperm development.
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“Alterations in the human version of the gene cause infertility and problems with sperm.”
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“the research team used genomic sequencing involving "long-reads" of DNA segments that are between 10,000 pairs of chemical DNA letters up to more than a million chemical base pairs.”
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“Adam Davidovich et al, Non-Mendelian inheritance of DNA methylation patterns in mice, Nature Genetics (2026). DOI: 10.1038/s41588-026-02604-z”
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info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.