Post reply

Reply to the message by David Turell

Name:

E-mail: (optional, won't be displayed directly)

Leave this field empty:

Homepage: (optional)

Leave this field empty:

Location: (optional)

Remember me (cookie)

Category:

Subject:

Formatting help

skip to input

format text bold: [b]bold text[/b]
format text italic: [i]italic text[/i]
insert hyperlink: [link=http://example.com/]link text[/link] / [link]http://example.com/[/link]
set text color: [color=#rgb]colored text[/color]
font size: [size=small]small text[/size]; [size=large]large text[/size]
insert list: [list][*]list item[/list]
insert image: [img]http://example.com/image.jpg[/img]; left: [img=left]http://example.com/image.jpg[/img]; right: [img=right]http://example.com/image.jpg[/img]; thumbnail: [img=thumbnail]http://example.com/image.jpg[/img]; thumbnail left: [img=thumbnail-left]http://example.com/image.jpg[/img]; thumbnail right: [img=thumbnail-right]http://example.com/image.jpg[/img]

:-)
;-)
:-P
:-D
:-|
:-(

Message:

> The new study:
> 
> https://science.sciencemag.org/content/372/6541/477.2?utm_campaign=ec_sci_2021-04-29&et_rid=17445044&et_cid=3755858
> 
> "Only eukaryotes and archaea use histones to package their DNA. This observation has prompted suggestions of an evolutionary affinity between these two domains of life. However, there are many differences between the structure of histones between the domains. Bowerman et al. extended earlier work to show how archaeal histones store and unpack DNA. In eukaryotes, a packet of four pairs of histones wraps around every ∼147 base pairs of DNA in a structure called a nucleosome. By contrast, the archaeal equivalent of a nucleosome, the archaeasome, forms a histone core with more than four histone pairs. Archaeasomes can expand, in effect stretching the coil, to open up the DNA in a way that is very different from how this process occurs in eukaryotes."
> 
> Comment: the theory that similar DNA storage means we descended from  Archaea is  not supported by this study. The storage methods are very different, but somewhat similar in that  we both use histones.