Acetylation, methylation and phosphorylation of histone tails alter chromatin openness and gene activity.
Histone acetylation neutralises lysine charge, loosens chromatin and activates genes; HDACs remove acetyls. Methylation can activate (H3K4me3) or repress (H3K27me3, H3K9me3). Readers, writers and erasers form the histone code.
HDAC inhibitors are used as cancer drugs.
Acetylation, methylation and phosphorylation of histone tails alter chromatin openness and gene activity.
Histone Modification is one of the 52 topics in Molecular Biology. It is rated Intermediate, so it suits learners who already know the core vocabulary. Related topics in this area include DNA Methylation, DNA Packaging, Gene Expression.
H3K9me3 marks constitutive heterochromatin.
Work through the Beginner topics in Molecular Biology first, such as Central Dogma, DNA Replication, Base Pairing, then return to Histone Modification. Intermediate topics assume the Beginner vocabulary.
The closest topics to Histone Modification are DNA Methylation, DNA Packaging, Gene Expression, Transcription Factors. Comparing them side by side is a good way to see how the ideas connect.
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Histone Modification. To practise the whole of Molecular Biology, use the Molecular Biology quiz.
Histone Modification: Acetylation, methylation and phosphorylation of histone tails alter chromatin openness and gene activity. DNA Methylation: Addition of methyl groups to cytosine, usually silencing gene expression. Read both side by side and note what each one explains.
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with DNA Methylation and explain the difference aloud. Finally, take the Molecular Biology quiz and come back to this page for any question you miss.
Addition of methyl groups to cytosine, usually silencing gene expression.
🧫 Molecular BiologyDNA wraps around histone proteins to form nucleosomes that coil into compact chromatin.
🧫 Molecular BiologyThe process by which information in a gene is used to make a functional product.
🧫 Molecular BiologyProteins that bind specific DNA sequences to turn genes on or off.
🧫 Molecular Biology