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Abstract
Understanding genetic regulation is a problem of fundamental importance. Recent studies have made it increasingly evident that, whereas the cellular genetic regulation system embodies multiple disparate elements engaged in numerous interactions, the central issue is the genuine function of the DNA molecule as information carrier. Compelling evidence suggests that the DNA, in addition to the digital information of the linear genetic code (the semantics), encodes equally important continuous, or analog, information that specifies the structural dynamics and configuration (the syntax) of the polymer. These two DNA information types are intrinsically coupled in the primary sequence organisation, and this coupling is directly relevant to regulation of the genetic function. In this review, we emphasise the critical need of holistic integration of the DNA information as a prerequisite for understanding the organisational complexity of the genetic regulation system.
Nearly half of our DNA has been written off as junk, the discards of evolution: sidelined or broken genes, viruses that got stuck in our genome and were dismembered or silenced, none of it relevant to the human organism or human evolution.
But research over the last decade has shown that some of this genetic "dark matter" does have a function, primarily in regulating the expression of host genes -; a mere 2% of our total genome -; that code for proteins. Biologists continue to debate, however, whether these regulatory sequences of DNA play essential or detrimental roles in the body or are merely incidental, an accident that the organism can live without.
A new study led by researchers at University of California, Berkeley, and Washington University explored the function of one component of this junk DNA, transposons, which are selfish DNA sequences able to invade their host genome. The study shows that at least one family of transposons -; ancient viruses that have invaded our genome by the millions -; plays a critical role in viability in the mouse, and perhaps in all mammals. When the researchers knocked out a specific transposon in mice, half their mouse pups died before birth.
This is the first example of a piece of "junk DNA" being critical to survival in mammals.
The mouse and humans share 99% of their protein coding genes in their genomes -; we are very similar with each other. So, what constitutes the differences between mice and humans? One of the major differences is gene regulation -; mice and humans have the same genes, but they can be regulated differently. Transposons have the capacity to generate a lot of gene regulatory diversity and could help us to understand species-specific differences in the world."
Lin He, Study Senior Author and Professor, Molecular and Cell Biology, University of California - Berkeley
originally posted by: Lumenari
a reply to: neoholographic
***Spoiler Alert***
Mankind as we know it isn't from here.
We try to keep telling y'all, nobody listens....
~signed, the Hopi~
originally posted by: hiddeninsite
a reply to: crappiekat
www.newsweek.com...
originally posted by: Lumenari
a reply to: neoholographic
***Spoiler Alert***
Mankind as we know it isn't from here.
We try to keep telling y'all, nobody listens....
~signed, the Hopi~
originally posted by: M5xaz
originally posted by: Lumenari
a reply to: neoholographic
***Spoiler Alert***
Mankind as we know it isn't from here.
We try to keep telling y'all, nobody listens....
~signed, the Hopi~
A long time ago, in a galaxy far, far away....?...