heterochromatin

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Related to Heterochromatin tissue: Constitutive heterochromatin

heterochromatin

 [het″er-o-kro´mah-tin]
that state of chromatin in which it is dark-staining, genetically inactive, and tightly coiled.
constitutive heterochromatin the chromatin in regions of the chromosomes that are invariably heterochromatic; it contains highly repetitive sequences of DNA that are genetically inactive and serves as a structural element of the chromosome.
facultative heterochromatin the chromatin in regions of the chromosomes that become heterochromatic in certain cells and tissues; for example, it makes up the inactive X chromosome in female somatic cells.

het·er·o·chro·ma·tin

(het'ĕr-ō-krō'mă-tin),
The part of the chromonema that remains tightly coiled and condensed during interphase and thus stains readily.

heterochromatin

/het·ero·chro·ma·tin/ (-kro´mah-tin) that state of chromatin in which it is dark-staining, genetically inactive, and tightly coiled.

heterochromatin

(hĕt′ə-rō-krō′mə-tĭn)
n.
Tightly coiled chromosomal material that stains deeply during interphase and is believed to be genetically inactive.

heterochromatin

[-krō′mətin]
Etymology: Gk, heteros, different, chroma, color
the part of a chromosome that is inactive in gene expression but may function in controlling metabolic activities, transcription, and cell division. It stains most intensely during interphase and usually remains in a condensed state throughout the cell cycle. It consists of two types: constitutive heterochromatin, which is present in all cells and is characteristic of the Y chromosome, and facultative heterochromatin, which is present in the inactivated X chromosome of the mammalian female. Compare euchromatin. See also chromatin. heterochromatic, adj.

het·er·o·chro·ma·tin

(het'ĕr-ō-krō'mă-tin)
The part of the chromonema that remains tightly coiled and condensed during interphase and thus stains readily.

heterochromatin

A length of chromatin in the genome that is permanently highly condensed and whose DNA is not transcribed.

heterochromatin

any chromosomal segments or whole chromosomes that appear darkly stained during interphase of the CELL CYCLE (as compared to EUCHROMATIN) due to tight condensation, which may indicate genetic inactivity. Hetero chromatin may be condensed at all times (constitutive) or only at certain times (facultative). see C-BANDING.

heterochromatin

that state of chromatin in which it is dark-staining, genetically inactive, and tightly coiled.