chromatin


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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

/chro·ma·tin/ (kro´mah-tin) the substance of chromosomes, the portion of the cell nucleus that stains with basic dyes. See euchromatin and heterochromatin.
sex chromatin  Barr body; the persistent mass of the inactivated X chromosome in cells of normal females.

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

[krō′mətin]
Etymology: Gk, chroma, color
the material within a cell nucleus from which the chromosomes are formed. It consists of fine, threadlike strands of DNA attached to proteins called histones and is readily stained with basic dyes. Chromatin occurs in two forms, euchromatin and heterochromatin, which are distinguishable during the phases of the cell cycle by their different degrees of staining, which in turn depends how tightly they are coiled. During cell division, portions of the chromatin condense and coil to form the chromosomes. Also called chromoplasm, karyotin. See also chromatid, euchromatin, heterochromatin, sex chromatin. chromatinic, adj.
enlarge picture
Rim of chromatin outlining the nuclear membrane

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.

chromatin

nuclear genetic material, which condenses (during cell division) into chromosomes

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]

chromatin (krō´mətin),

n the genetic material present in the nucleus, consisting of DNA and associated proteins, seen as irregular clumps in quiescent cells.

chromatin

the substance of the chromosomes, composed of nucleic acids and basic proteins (histones), the material in the nucleus that stains with basic dyes.

sex chromatin
Barr body; the persistent mass of the material of the inactivated X chromosome in cells of normal females. See also drumstick.
References in periodicals archive ?
Recently, toluidine blue, a nuclear stain used to evaluate chromatin integrity [4, 26, 31] has been used successfully to morphometric analysis by CASMA [4, 34, 38], and this combination has opened the possibility to evaluate simultaneously the sperm head morphometry and chromatin integrity as well as their relationship and could be a powerful tool to improve the results of spermiogram [33].
After centrifugation at 14,000 X g for 10 min, the supernatant was collected as the S2 fraction and combined with S1 as the chromatin fraction.
The chromatin is usually coarse and clumped, and nucleoli may be of astounding size.
Researchers found that poly-ADP-ribose (PAR), one of the main actors in chromatin de-compaction and DNA damage repair is the cornerstone for the nuclear ATP synthesis.
This chromatin body is absent male cells but may appear in certain types of inter-sex where the external sex appears at first to be the male.
Most importantly, they found that the nucleosomes are assembled in irregular groups across the chromatin and nucleosome-free-DNA regions separate these groups.
Statistical analysis: Statistical analyses were done using t-test and Mann Whitney test for sperm apoptosis and sperm chromatin by SPSS (version 16).
These pathways have been studied and most of the components that transmit the signal from perception site to chromatin have been identified for the major plant hormones, such as auxin, gibberellins, cytokinins, ethylene, and abscisic acid as well as for brassionosteroids, jasmonic and salicylic acid (Santner & Estelle, 2009, Wang & Irving, 2011).
Published in the journal Cell, the results highlight the role of the transcription factor dATF-2 in chromatin assembly, marking a major advance in our understanding of non-Mendelian inheritance.
The assessment of the sex chromatin in animals is based on the premise that it represents the sexual status (XX and XY) chromosomes of a particular animal.
Chromatin immunoprecipitation assays; methods and protocols.
Their DNA repair antibody catalog includes antibodies for the study of double-stranded DNA break repair, chromatin interactions, zinc finger domains, DNA replication, and more.