Euchromatin

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Related to euchromatic: heterochromatic

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 ?
Recent studies suggest that classical euchromatic variants of 9q12/qh+ and heteromorphism on chromosome 6q may be responsible for recurrent abortions (15, 16).
3) International Human Genome Sequencing Consortium, "Initial Sequencing and Analysis of the Human Genome," Nature 409 (2001): 860-920; International Human Genome Sequencing Consortium, "Finishing the Euchromatic Sequence of the Human Genome," Nature 431 (2004): 931-45.
3A) an euchromatic nucleus and a cytoplasm containing rough endoplasmic reticulum, Golgi bodies, and mitochondria.
It is suggested that euchromatic sequences may be involved in the increment of genome size in this species (Libertini et al.
International Human Genome Consortium, "Finishing the Euchromatic Sequence of the Human Genome" (2004) 431 Nature 931.
To describe the different C-banding patterns, three autosomal morphs, denoted A, B, and C, were recognized on the basis of previous reports (10,12) (Figure 2): A morph (a subterminal C-heterochromatic block is present at one chromosomal end; the other end is euchromatic or has a very small C-band); B morph (C-heterochromatic blocks are clearly present at both chromosomal ends); and C morph (the chromosome is totally euchromatic or has a very small C-band).
TFL2/LHP1, the plant homologue of animal HP1, surprisingly does not primarily localize to heterochromatin but it participates in the regulation of specific genes in euchromatic regions.