Concept
Epigenetics
Epigenetics refers to heritable or stable gene-regulation changes that do not alter the DNA sequence itself, such as DNA methylation.
Epigenetic marks sit between genome and environment — a staple of modern genetics teaching.
Evidence
What the evidence shows
Drawn from 6 studies in this library. Each finding starts with a plain-language takeaway, then the denser detail. Supports means evidence for a finding; Challenges means evidence against a stated position; Qualifies marks scope with a short note on each study’s contribution. Challenged positions are labeled — they are not findings.
Multiple empirical papers in this library examine epigenetics with mechanistic biological findings.
- Epigenetic locking of Foxp3 in Tregs
- Genetics shapes methylation and expression
- A DNA methylation clock for human age
Study Role Design N Population Outcome Epigenetic locking of Foxp3 in Tregs Supports Animal / in-vitroBisulphite sequencing and ChIP of foxp3/TSDR in natural vs TGF-β–induced regulatory T cells Epigenetic comparison of Treg populations — no single primary analytic N in stored text Natural and induced Foxp3+ regulatory T cells (and comparator thymocytes) Demethylation of foxp3 regulatory regions predicting Treg stability Genetics shapes methylation and expression Supports Cross-sectionalIllumina 27K promoter methylation in Yoruba HapMap LCLs linked to genotypes and RNA-seq N=77 · 77 LCLs; RNA-seq available for 69 HapMap Yoruba lymphoblastoid cell lines Genetic and expression correlates of inter-individual DNA methylation A DNA methylation clock for human age Supports Computational / modellingElastic-net DNA methylation age predictor trained/validated across multi-tissue Illumina datasets N=7844 · 7,844 non-cancer samples from 82 datasets used in the overall analysis (cancer sets analysed separately) Human tissues and cell types with Illumina DNA methylation arrays Multi-tissue epigenetic age from 353 clock CpGs TSDR-like element is demethylated in stable Tregs; weak demethylation predicts unstable induced Foxp3.
Inter-individual methylation variation tracks genetics and correlates with expression.
353 clock CpGs track age accurately across tissues; stem cells appear epigenetically young.
VTRNA2-1 shows concordant multi-tissue methylation differences, is partly set by periconceptional environment, and remains stable ≥10 years; ME regions are depleted for CGIs/SINEs and enriched for LINEs/ERVs.
Open questions
Tensions and limits
Some items are genuine disagreements on the same question. Others mark different assays, populations, or outcomes — limits on how far one study travels — not a forced fight between papers.
Systems and scales differ across epigenetics studies (species, tissues, methods), so mechanisms should not be over-generalised.
- Epigenetic locking of Foxp3 in Tregs
- Genetics shapes methylation and expression
- A DNA methylation clock for human age
Study Role Design N Population Outcome Epigenetic locking of Foxp3 in Tregs Supports Animal / in-vitroBisulphite sequencing and ChIP of foxp3/TSDR in natural vs TGF-β–induced regulatory T cells Epigenetic comparison of Treg populations — no single primary analytic N in stored text Natural and induced Foxp3+ regulatory T cells (and comparator thymocytes) Demethylation of foxp3 regulatory regions predicting Treg stability Genetics shapes methylation and expression Supports Cross-sectionalIllumina 27K promoter methylation in Yoruba HapMap LCLs linked to genotypes and RNA-seq N=77 · 77 LCLs; RNA-seq available for 69 HapMap Yoruba lymphoblastoid cell lines Genetic and expression correlates of inter-individual DNA methylation A DNA methylation clock for human age Supports Computational / modellingElastic-net DNA methylation age predictor trained/validated across multi-tissue Illumina datasets N=7844 · 7,844 non-cancer samples from 82 datasets used in the overall analysis (cancer sets analysed separately) Human tissues and cell types with Illumina DNA methylation arrays Multi-tissue epigenetic age from 353 clock CpGs
Common misconceptions
Epigenetics findings from one model organism always transfer to humans.
Model systems teach mechanism; transfer to other species is a separate empirical claim.
Exam-style questions
Short-answer questions that ask you to explain or compare, not recall.
What is Epigenetics?
Epigenetics refers to heritable or stable gene-regulation changes that do not alter the DNA sequence itself, such as DNA methylation.
Why does Epigenetics matter for biology undergraduates?
Epigenetic marks sit between genome and environment — a staple of modern genetics teaching.
The studies
6 studies in this library bear on Epigenetics, ordered by citations.
- A DNA methylation clock for human age
A 353-CpG epigenetic clock predicts age across diverse human tissues.
- Epigenetic locking of Foxp3 in Tregs
Stable regulatory T cells fully demethylate a conserved foxp3 region; TGF-β–induced Tregs do not.
- Genetics shapes methylation and expression
In HapMap LCLs, promoter methylation associates with genetic variants and transcript levels.
- Three CpGs track blood aging
Age-related blood DNA methylation at a few CpGs predicts chronological age with ~3.3-year MAD.
- VTRNA2-1: an environment-sensitive human epiallele
Independent genome-wide methylation screens converge on VTRNA2-1 as a systemic metastable epiallele shaped by periconceptional environment and stable for years.
- Histone acylations respond to plant stress
Rice histone butyrylation and crotonylation mark active chromatin and shift under starvation/submergence.
Learn alongside
Change log
What changed
Dated edits to this page's evidence: studies added or removed from a claim, claims added or withdrawn, and new explanations tagged here. Rewordings are not listed.
- Concept page published