Heterochromatin: Difference between revisions
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Heterochromatin, one of two [[Chromatin|chromatin]] types derived from a [[Chromosome|chromosome]] acts as to ensure repression of gene [[Transcription|transcription]] or silencing. | Heterochromatin, one of two [[Chromatin|chromatin]] types derived from a [[Chromosome|chromosome]] acts as to ensure repression of gene [[Transcription|transcription]] or silencing. There are two types of heterochromatin; [[constitutive heterochromatin|constitutive heterochromatin]] and [[facultative heterochromatin|facultative heterochromatin]]. | ||
[[X chromosome|X-chromosome]] inactivation is an example of hetrochromatin silencing genes where the heterochromatin takes the form of a structure known as a [[Barr body|Barr body]]. X chromosome inactivation is due to Xist transcription being activated in later development of the embryo whereas Tsix transcription is inactivated in the X chromosome being silenced. Tsix transcription remains activated in the active form of the X chromosome whereas Xist is silenced. | |||
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Latest revision as of 16:52, 3 December 2017
Heterochromatin, one of two chromatin types derived from a chromosome acts as to ensure repression of gene transcription or silencing. There are two types of heterochromatin; constitutive heterochromatin and facultative heterochromatin.
X-chromosome inactivation is an example of hetrochromatin silencing genes where the heterochromatin takes the form of a structure known as a Barr body. X chromosome inactivation is due to Xist transcription being activated in later development of the embryo whereas Tsix transcription is inactivated in the X chromosome being silenced. Tsix transcription remains activated in the active form of the X chromosome whereas Xist is silenced.