Chimps \'r not us (Introduction)
Chimps have about 98% the same genes as us taken just on a total score. But they are not arranged the same way and all the modifiers of gene expression result in an overall difference that is estimated by various authors to be around 80%. Now a new study looking at newly found miRNAs, the very short modifiers (24 bases), finds that 56.7% are unique to humans. Lots of evolutionary change in the genome produced humans it seems:-"In the early days of the miRNA field, there was an emphasis on identifying miRNAs that are conserved across organisms: e.g., let-7 first described in 2000 (63, 64). Nonetheless, species-specific miRNAs (e.g., cel-lsy-6 in C. elegans) (62) have also been described and characterized as have been miRNAs that are present only in one or a few species of the same genus. Therefore, enforcing an organism-conservation requirement during miRNA searches is bound to limit the number of potential miRNAs that can be discovered, leaving organism- and lineage-specific miRNAs undiscovered (53-56). In our effort to further characterize the human miRNA repertoire, we liberated ourselves from the conservation requirement: not surprisingly then, 56.7% of our newly discovered miRNAs are human-specific whereas 94.4% are primate- specific (Table 2). Considering that many miRNA studies to date have focused on seeking and analyzing conserved miRNAs, it is not surprising that, of the human miRNAs in miRBase, we found a larger fraction to be conserved in rodents and invertebrates (Table 2). These findings strongly suggest the possibility of a wide-ranging species-specific miRNA-ome that has yet to be characterized. Indeed, it is reasonable to expect that at least some of these novel primate-specific miRNAs participate in unexplored aspects of regulatory processes that cannot be captured by the currently available mouse disease models. Thus, not only could these newly discovered miRNAs provide new molecular insights but they could also help us define novel biomarkers for tissue or disease states."-http://www.pnas.org/content/early/2015/02/18/1420955112.long
Complete thread:
- Chimps \'r not us -
David Turell,
2012-06-25, 01:08
- Chimps \'r not us - xeno6696, 2012-06-25, 18:20
- Chimps \'r not us -
David Turell,
2012-07-19, 21:09
- Chimps \'r not us - David Turell, 2012-11-09, 04:51
- Chimps \'r not us -
David Turell,
2013-09-27, 16:11
- Chimps \'r not us -
David Turell,
2015-03-03, 18:11
- Chimps 'r not us - David Turell, 2017-06-26, 23:57
- Chimps \'r not us -
David Turell,
2015-03-03, 18:11