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# Epigenetics

Changes in gene expression without a change in sequence, and the disorders they cause.

6 pages

## Topics

- [**Epigenetics: DNA and histone methylation** Epigenetics means chemical marks on DNA and histones that switch genes on or off without…](https://durgical.com/en/biochemistry/topics/epigenetics-dna-and-histone-methylation/)
- [**5-Methylcytosine** 5-Methylcytosine is cytosine with an extra methyl group; it is the main epigenetic mark on DNA…](https://durgical.com/en/biochemistry/molecules/5-methylcytosine/)
- [**Epigenetic disorders, environment and methylation testing** Diseases can come from faulty epigenetic marks or from genes that write and read them…](https://durgical.com/en/biochemistry/topics/epigenetic-disorders-environment-and-methylation-testing/)

## Conditions and syndromes

- [**Prader–Willi and Angelman syndromes (imprinting)** Prader–Willi and Angelman syndromes come from the same chromosome 15 region: Prader–Willi when…](https://durgical.com/en/conditions/prader-willi-and-angelman-syndromes/)
- [**Beckwith–Wiedemann syndrome** An overgrowth syndrome with a large tongue, abdominal wall defect, low blood sugar at birth and…](https://durgical.com/en/conditions/beckwith-wiedemann-syndrome/)
- [**Rett syndrome** A genetic brain disorder, mostly in girls, where skills are lost after 6–18 months of normal…](https://durgical.com/en/conditions/rett-syndrome/)

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This section is an index: it gathers pages from Biochemistry, Pathology, Embryology and other sections without repeating them. Educational content; it does not replace a geneticist's assessment or genetic counselling.

Representative model, for educational purposes only.

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Source: https://durgical.com/en/genetics/epigenetics/
License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Cite as: DurgiPedia (durgical.com), https://durgical.com/en/genetics/epigenetics/