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Currently playing with some ideas for a project and needed some guidance. I am wondering, both in Drosophila melanogaster and in general, is the amount of heterochromatin a cell/nucleus can produce limited/consistent or variable?

Does one cell in a D. melanogaster produce a similar amount of heterochromatin as another cell in the same fly or another fly (assuming same conditions - environment etc.) or is the heterochromatin production quite variable? How is heterochromatin production regulated?

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Heterochromatin profile is of course different in different cells but I am not sure if absolute heterochromatin content will vary greatly. This DNAse hypersensitivity region data is for human cells but same principles apply to all organisms. If I have to take a guess then I would say that quiescent cells are likely to have more heterochromatin. Heterochromatin production is regulated by different epigenetic mechanisms but I cannot comment (I feel it is unlikely) if there is a mechanism to control absolute heterochromatin content.

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