New theory... ?

Genetics as it applies to evolution, molecular biology, and medical aspects.

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
rlinsurf
Garter
Garter
Posts: 2
Joined: Mon Apr 21, 2008 8:21 pm

New theory... ?

Post by rlinsurf » Mon Apr 21, 2008 9:08 pm

Hi--

I'm new to this forum, and not much less to biology. So I hope you'll forgive my n00bness, especially for the extremely vague nature of this question.

I saw a documentary on PBS about some new genetic theory, which is about a macro realm, or perhaps a layer (?) above DNA, where the theory says, is where most adaptations occur, by chemicals acting on the DNA? Perhaps something like the e-realm or t-realm (I know that's wrong!)?

Can someone point me in the right direction?

Thanks :)

User avatar
jonmoulton
Viper
Viper
Posts: 442
Joined: Fri Feb 15, 2008 5:38 pm
Location: Philomath, Oregon, USA

Re: New theory... ?

Post by jonmoulton » Mon Apr 21, 2008 11:42 pm

I didn't see the documentary, but there is a layer of gene expression regulation that is controlled by RNA, especially by microRNAs (miRNA), and that is a fairly recent discovery. Is that what you are referring to?

rlinsurf
Garter
Garter
Posts: 2
Joined: Mon Apr 21, 2008 8:21 pm

Post by rlinsurf » Tue Apr 22, 2008 12:37 am

Hm. IIRC, it did have something to do with RNA. But there was another name for it. Is there some sort of layer involved? I'm sorry, I wish I could remember more. The thing that astonished me was when they said that in this layer, changes were far more rapid than in DNA, and that some huge number of changes (90%?) were possibly due to this effect. They also had a name for the layer, as I (tried) to remember above.

Darby
Viper
Viper
Posts: 1278
Joined: Thu Mar 02, 2006 5:29 pm
Location: New York, USA

Post by Darby » Tue Apr 22, 2008 2:56 am

There is a whole movement focused on changes in promoters and other gene expression mechanisms in driving evolutionary changes.

User avatar
canalon
Inland Taipan
Inland Taipan
Posts: 3909
Joined: Thu Feb 03, 2005 2:46 pm
Location: Canada

Post by canalon » Tue Apr 22, 2008 1:27 pm

Are you talking about epigenetics?
There are now quite a lot of data showing that besides genes quite a lot of things can be transmitted by other means, for example DNA methylation state, presence of some proteins, regulatory RNA etc...
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)

Darby
Viper
Viper
Posts: 1278
Joined: Thu Mar 02, 2006 5:29 pm
Location: New York, USA

Re: New theory... ?

Post by Darby » Tue Apr 22, 2008 4:04 pm


Post Reply

Who is online

Users browsing this forum: No registered users and 8 guests