Euchromatin


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euchromatin

[yü′krō·mə·tən]
(cell and molecular biology)
The portion of the chromosomes that stains with low intensity, uncoils during interphase, and condenses during cell division.

Euchromatin

 

(also active chromatin), the portion of the chromatin that retains the uncoiled form of elementary deoxyribonucleoprotein (DNP) threads in the interval between cell divisions (that is, in the interphase), as opposed to the portion of the chromatin known as heterochromatin, which retains the coiled form. Euchromatin also differs from heterochromatin in that it participates in the intensive synthesis of ribonucleic acid (RNA) and contains a larger quantity of nonhistone proteins. Euchromatin contains not only DNP but also ribonucleoprotein granules, which have a diameter of 200–500 angstroms and serve to complete the maturation of the RNA and its transfer into the cytoplasm. Euchromatin contains most of the structural genes of an organism (seeCHROMOSOME).

References in periodicals archive ?
The nuclei possess fine granulated euchromatin and heterochromatin with the latter adjacent to the nuclear envelope (Fig.
Sertoli cells with euchromatin nuclei and intact cytoplasmic organelles were seen.
As H3K9 is primarily found in the silenced region within the euchromatin, G9a has been implicated to play a role in the silencing of gene expression [28-30].
Z in chromatin is implicated in transcriptional activation and euchromatin maintenance (Redon et al.
The electron micrographs, of the untreated mouse mammary tumor cells were bounded by delicate plasma membranes and displayed large nuclei containing uniformly distributed euchromatin and conspicuous marginal heterochromatin abutting the nuclear membrane and a prominent nucleolus (Figs.
More importantly, this euchromatin state is maintained through the expression of CDX2 and CREBBP.
1998), the GABA-ir neurons could be classified as type 1 neuronal cells (NR1), which are the largest neurons having an oval or pyramidal shape (diameter, about 10 x 20 [micro]m), and contain an oval-shaped nucleus with complete euchromatin, and large nerve process.
Silent genes tend to be packaged as heterochromatin whereas active, functional genes are in euchromatin.
High content of euchromatin of nucleus and extended network of hyperplastic tubules of granular endoplasmic reticulum (GER) with flocculent material in the lumen showed a high level of protein synthesis.
In contrast, DNA in euchromatin is susceptible to nuclease digestion and is unavailable for qPCR.
Key epigenetic players are DNA methylation and histone post-translational modifications, which interplay with each other, with regulatory proteins and with non-coding RNAs, to remodel chromatin into domains such as euchromatin, constitutive or facultative heterochromatin and to achieve nuclear compartmentalization (1).
The distribution of mitomycin C-induced sister chromatid exchanges in the euchromatin and heterochromatin of the Indian muntjac, Chromosoma 64: 97-107.