chromatin


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.

chromatin

 [kro´mah-tin]
the substance of the chromosomes, composed of DNA and basic proteins (histones), the material in the nucleus that stains with basic dyes.
sex chromatin the persistent mass of the material of the inactivated X chromosome in cells of normal females; called also Barr body.

chro·ma·tin

(krō'ma-tin),
The genetic material of the nucleus consisting of deoxyribonucleoprotein that occurs in two forms during the phase between mitotic divisions: as heterochromatin, seen as condensed, readily stainable clumps; as euchromatin, dispersed lightly staining or nonstaining material. During mitotic division the chromatin condenses into chromosomes.
[G. chrōma, color]

chromatin

(krō′mə-tĭn)
n.
A complex of nucleic acids and proteins, primarily histones, in the cell nucleus that stains readily with basic dyes and condenses to form chromosomes during cell division.

chro′ma·tin′ic adj.

chromatin

The threadlike stainable material seen in nuclei during interphase, which corresponds to chromosomes (nucleic acids/DNA, associated histones, and other proteins bundled into nucleosomes) in the eukaryotic nucleus.

chromatin

Genetics The stainable material of interphase nuclei corresponding to chromosomes; chromatin consists of nucleic acids–DNA and associated histone protein, which are packed into nucleosomes; euchromatin is loosely packed and accessible to RNA polymerases. See Salt & pepper chromatin. Cf Heterochromatin.

chro·ma·tin

(krō'mă-tin)
The genetic material of the nucleus, consisting of deoxyribonucleoprotein. During mitotic division, the chromatin condenses into chromosomes.
[G. chrōma, color]

chromatin

DNA. The elongated, fine-stranded complex of roughly equal quantities of DNA and the protein histone, from which chromosomes are made by condensing into a coil. The individual chromosomes cannot be distinguished in a chromatin strand.

chromatin

that part of the cell nucleus which becomes deeply stained with basic dyes. This is now known to be chromosomal material consisting of DNA together with HISTONE and nonhistone proteins.

chro·ma·tin

(krō'mă-tin)
The genetic ma terial of the nucleus, consisting of deoxy ribonucleoprotein. During mitotic division, the chromatin condenses into chromosomes.
[G. chrōma, color]
References in periodicals archive ?
Indeed, Schottas team has now shown that the density of epigenetic tags determines whether or not Foxa2 can bind and open up condensed chromatin. These results reveal important details of the process by which a network of transcription factors can control the activity of key genes, he says.
They expected that yeast genetically engineered to carry fewer copies of certain histone genes than normal or control yeast would have chromatin changes that would result in the yeast living less than controls.
With focusing on the chromatin integrity, evidence suggests a negative relationship between the incompetence of the chromatin material in sperm chromatin and the fertility potential of spermatozoa (25).
By combining their chromatin dye with electron-microscope tomography, they created ChromEMT.
Peak calling with visualization: Peak calling was, in case of this study, the computational method to identify genomewide chromatin regions with targeted H3 trimethylation significant to the other regions.
These acetylation modifications are critical for histone nuclear import and chromatin assembly.
Cooperative Function of Chromatin Remodeling Complex SWI/SNF with pRB.
Result: The cytological parameters of Robinson's grading system including cell dissociation, nuclear margins and nuclear chromatin showed weak correlation with tumor grade.
The adoption of a female attire by the males and females as males will be determined by examination of sex chromatin. Probable evidence of sex: In Males--Absence of breast tissue and the presence of penis and testicles.
INTEGRATION OF DNA REPLICATION, CHROMATIN MODIFICATION, AND DEVELOPMENT DURING DROSOPHILA OOGENESIS KRISTOPHER H.