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Histones

Histones

proteins that dna tightly coils around to form chromosomes.


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DNA

I think this is a case where winding the DNA onto histones protects it from the nuclease, so the DNA is cut only in regions between the histones. If the same length of DNA is wound around each histone and every DNA segment between histones gets cut, ...

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by jonmoulton
Thu Feb 14, 2013 4:32 pm
 
Forum: Genetics
Topic: DNA
Replies: 8
Views: 5175

What are the potential benefits of epigenetics research?

my research is that...Epigenetic processes, primarily DNA methylation and covalent modifications of histones, regulate the transcriptional activity of genes in a manner that can be modified by environmental cues. This allows variation in the expression of the transcriptome ...

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by einfopedia
Wed Mar 28, 2012 7:31 am
 
Forum: Evolution
Topic: What are the potential benefits of epigenetics research?
Replies: 4
Views: 5129

Theories - Origin of Life

... We are observing levels of information and control above and beyond genome information. The proteins involved in epigenetic control (such as histones) are themselves encoded by the genome. They don’t appear out of nowhere. Yes, there are some proteins which affect the expression of other ...

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by AstraSequi
Tue Mar 27, 2012 2:41 am
 
Forum: Evolution
Topic: Theories - Origin of Life
Replies: 559
Views: 755228

Re: pro vs eu chromosomes

As Jackbean said, most eukaryotic chromosomes consist of multiple sets of linear DNA molecules. I believe eukaryotic chromosomes also have histones, which are absent in (most) non-archaean prokaryotes. Of course, eukaryotic chromosomes are housed in the nucleus and interact with the nuclear ...

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by awkko808
Fri Dec 16, 2011 8:31 am
 
Forum: Microbiology
Topic: pro vs eu chromosomes
Replies: 2
Views: 1311

Origin of the Nucleus

Raven's Biology briefly mentions that the nucleus may have originated from an archaean. Some archaea have histones and similar DNA-processing enzymes, which supports this hypothesis. I haven't seen too much research on this, though.

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by aptitude
Wed Dec 07, 2011 7:16 am
 
Forum: Evolution
Topic: Origin of the Nucleus
Replies: 3
Views: 2571
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