heterochromatin

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het·er·o·chro·ma·tin

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

heterochromatin

(ˌhɛtərəʊˈkrəʊmətɪn)
n
(Biology) the condensed part of a chromosome that stains strongly with basic dyes in nondividing cells and has little genetic activity. Compare euchromatin

het•er•o•chro•ma•tin

(ˌhɛt ər əˈkroʊ mə tɪn)

n.
the dense, highly stainable part of a chromosome.
[1930–35]
References in periodicals archive ?
C-banding of mitotic metaphase revealed constitutive heterochromatin blocks (thin C-bands) in the paracentromeric region in most chromosomal elements, with the exception of one small pair of autosomes (thick C-bands).
Approximately 15-20% of this non-coding part of human DNA is constitutive heterochromatin.
The researchers looked in detail at the mysterious tightly packed portions of the genome, called constitutive heterochromatin.
The constitutive heterochromatin (C-banding) was performed according to Sumner (1972), with some minor adjustments (Lui et al.
Constitutive heterochromatin regions were observed on the centromeres of chromosomes in all four species by using C-banding.
C-band results showed that all constitutive heterochromatin was confined to the X chromosome, differing from the pattern observed in Cavia and Galea.
Detection of constitutive heterochromatin (C-banding) was performed according to Sumner (1972), with some minor modifications.
Constitutive heterochromatin regions (C-bands) were revealed using the method of Summer (1972), using propidium iodide as a counterstain.
C banding by constitutive heterochromatin was located in pericentromeric and telomeric position.
Morphological variations of constitutive heterochromatin are frequently detected during routine cytogenetic analysis.
The latest research for examining constitutive heterochromatin, pathology-related inclusions and sumoylation are also discussed.