Dictionary » C » Chromatin



noun, plural: chromatins

A complex of nucleic acids (e.g. DNA or RNA) and proteins (histones), which condenses to form a chromosome during cell division. In eukaryotic cells, it is found within the cell nucleus whereas in prokaryotic cells, it is found within the nucleoid. Its functions are to package DNA into a smaller volume to fit in the cell, strengthen the DNA to allow mitosis and meiosis, and to serve as a mechanism to control expression.


It can be easily recognized through staining, hence its name, which literally means coloured material.

Word origin: Greek khrōma, khrōmat-, color + -in.

Related terms: barr chromatin body, Y chromatin, chromatin body.

Compare: chromosome.

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X chromosome inactivation

... chromosome inactivation is happening through transcriptional repression of the X chromosome. The X chromosome of male germ cells is in a condensed chromatin state and is transcriptionally repressed during early spermatogenesis but to my knowledge this is not considered as "X chromosome inactivation". ...

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by cathbr
Thu Jul 18, 2013 3:56 pm
Forum: Molecular Biology
Topic: X chromosome inactivation
Replies: 1
Views: 1511

cell structure

Not exactly 1 chromatin fibre equals 1 chromosome.

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by understandbiology
Thu Jun 27, 2013 12:39 pm
Forum: Cell Biology
Topic: cell structure
Replies: 3
Views: 2803

Apoptosis in the substantia nigra

... nigra in four normal aged subjects. Morphological characteristics of apoptosis, such as contact loss with surrounding tissues, cell shrinkage and chromatin condensation, were found in 2% of the total number of melanized neurons analyzed. Although endoplasmic reticulum appeared normal, mitochrondria ...

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by MarkHolland
Sat Mar 30, 2013 3:03 pm
Forum: Cell Biology
Topic: Apoptosis in the substantia nigra
Replies: 1
Views: 2329

Log paper

Hi!! I just finished a chromatin practical and I have to create on a log paper the relationship between the molecular weight of the histons and their travel distance from the SDS-Page. I am quite confused about it. Do I have to plot ...

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by simina
Wed Feb 13, 2013 4:20 pm
Forum: General Discussion
Topic: Log paper
Replies: 2
Views: 1158

Re: Animal cell nucleus shape changes

... for a while. Transcription occurs in the nucleus, but then the mRNA is moved out of the nucleus to the cytosol where translation takes place. Chromatin is an important part of the contents of the nucleus, but other structures (for instance splicosomes) are also present and vital for gene expression. ...

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by jonmoulton
Fri Nov 16, 2012 4:03 pm
Forum: Cell Biology
Topic: Animal cell nucleus shape changes
Replies: 7
Views: 9259
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