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heterochromatin Line breaks: het¦ero|chro¦ma¦tin
Pronunciation: /ˌhɛtərəʊˈkrəʊmətɪn/

Definition of heterochromatin in English:


[mass noun] Biology
Chromosome material of different density from normal (usually greater), in which the activity of the genes is modified or suppressed. Compare with euchromatin.
Example sentences
  • The organization of DNA into euchromatin and heterochromatin is implicated in gene silencing.
  • Numerous genes act to remodel and repress chromatin in heterochromatin and around euchromatic genes during development.
  • Thus, the density of genes in heterochromatin is about 1% of that in euchromatin.
Definition of heterochromatin in:
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