heterochromatin

Noun

Meaning

heterochromatin (countable and uncountable, plural heterochromatins)

(cytology) Heterochromatic tightly coiled chromosome material; believed to be genetically inactive

Synonyms

Related terms

Examples

An example of facultative heterochromatin is X chromosome inactivation in female mammals: one X chromosome is packaged as facultative heterochromatin and silenced, while the other X chromosome is packaged as euchromatin and expressed. Source: Internet

In most organisms, constitutive heterochromatin occurs around the chromosome centromere and near telomeres. Source: Internet

Methylation of lysine 9 of histone H3 has long been associated with constitutively transcriptionally silent chromatin (constitutive heterochromatin ). Source: Internet

Not all euchromatin is necessarily transcribed, but in general that which is not is transformed into heterochromatin to protect the genes while they are not in use. Source: Internet

These regions contain few genes, and it is unclear whether any significant phenotypic effect results from typical variation in repeats or heterochromatin. Source: Internet

These two complexes localize in a siRNA -dependent manner on chromosomes, at the site of heterochromatin assembly. Source: Internet

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