Navigation Links
MBL researchers probe how an ancient microbe thrives and evolves without sex

A January 2004 finding by biologists at the Josephine Bay Paul Center for Comparative Molecular Biology and Evolution added important evidence to the radical conclusion that a group of diminutive aquatic animals called bdelloid rotifers have evolved for tens of millions of years without sexual reproduction, in apparent violation of the rule that abandonment of sexual reproduction is a biological dead end. Now, MBL scientists are beginning to understand just what's different about these creatures' DNA that has enabled them to succeed where other asexual species have failed.

In a paper published in this week's Proceedings of the National Academy of Sciences (PNAS), MBL scientists Irina R. Arkhipova and Matthew Meselson provide evidence that suggests bdelloid rotifers--which probably gave up sex at least 50 million years ago but have still evolved into 370 species--handle DNA transposons more efficiently than other asexual species. Transposons are small snippets of "junk DNA" that sexual reproduction compensates for, but which often go unchecked and are believed to contribute to mutation (and eventually extinction) in species that reproduce asexually.

To learn more about the bdelloid rotifers' unique ability to evolve without sex, Arkhipova and Meselson studied portions of different bdelloid rotifer genomes and surveyed the diversity, structural organization, and patterns of evolution of DNA transposons.

The scientists found that DNA transposons in bdelloid rotifers are in a different, perhaps less damaging, location than those found in other creatures. Many bdelloid DNA transposons have the same surrounding sequences, which may indicate preferences for specific locations. Indeed, many of them appear to be located at the tip of the chromosome in an area called the telomere, different from the gene-rich portions of the genome, whereas most species tend to have DNA transposons dispersed throughout their genome.


Source:Marine Biological Laboratory

Page: 1

Related biology news :

1. NYU researchers simulate molecular biological clock
2. Vital step in cellular migration described by UCSD medical researchers
3. ASU researchers finds novel chemistry at work to provide parrots vibrant red colors
4. UCSD researchers maintain stem cells without contaminated animal feeder layers
5. Why do insects stop breathing? To avoid damage from too much oxygen, say researchers
6. New protein discovered by Hebrew University researchers
7. First real-time view of developing neurons reveals surprises, say Stanford researchers
8. Agilent Technologies releases automated literature search tool for biology researchers
9. Self-assembled nano-sized probes allow Penn researchers to see tumors through flesh and skin
10. Yale researchers identify molecule for detecting parasitic infection in humans
11. US life expectancy about to decline, researchers say
Post Your Comments:

(Date:11/17/2015)... -- Vigilant Solutions announces today that Mr. Dick W. ... --> --> Mr. Boyce ... at TPG Capital, one of the largest global investment ... revenue.  He founded and led TPG,s Operating Group, which ... 1997 to 2013.  In his first role, he served ...
(Date:11/12/2015)... , Nov. 12, 2015  A golden retriever that ... muscular dystrophy (DMD) has provided a new lead for ... Hospital, the Broad Institute of MIT and Harvard and ... . Cell, pinpoints a ... "escape" the disease,s effects. The Boston Children,s lab of ...
(Date:11/11/2015)... --  MedNet Solutions , an innovative SaaS-based eClinical technology company ... to announce that it will be a Sponsor of the ... be held November 17-19 in Hamburg , ... iMedNet , MedNet,s easy-to-use, proven and affordable ... been able to deliver time and cost savings of up ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... Halozyme Therapeutics, Inc. (NASDAQ: HALO ) will be ... York on Wednesday, December 2 at 9:30 a.m. ET/6:30 ... CEO, will provide a corporate overview. th Annual ... 1:00 p.m. ET/10:00 a.m. PT . Jim Mazzola , ... corporate overview. --> th Annual Oppenheimer Healthcare Conference ...
(Date:11/24/2015)... 24, 2015 /PRNewswire/ - Aeterna Zentaris Inc. (NASDAQ:  AEZS) (TSX: ... behalf of the Toronto Stock Exchange, confirms that as ... no corporate developments that would cause the recent movements ... --> About Aeterna Zentaris Inc. ... --> Aeterna Zentaris is a specialty biopharmaceutical company ...
(Date:11/24/2015)... ... November 24, 2015 , ... The Academy of Model Aeronautics (AMA), led by ... known as Multirotor Grand Prix, to represent the First–Person View (FPV) racing community. , ... have embraced this type of racing and several new model aviation pilots have joined ...
(Date:11/24/2015)... 24, 2015 /PRNewswire/ - Aeterna Zentaris Inc. (NASDAQ: ... the remaining 11,000 post-share consolidation (or 1,100,000 pre-share ... "Series B Warrants") subject to the previously disclosed ... 23, 2015, which will result in the issuance ... to the issuance of such shares, there will ...
Breaking Biology Technology: