Navigation Links
A new explanation for evolutionary changes in genetic sex-determination systems
Date:10/19/2007

In animals with separate sexes, embryos commit to becoming male or female at an early stage. Often this key decision is made by sex determination genes on the sex chromosomes. The genes involved in sexual development have changed remarkably little during evolution. In contrast, the sex determination genes and the sex chromosomes themselves are among the most rapidly changing features of the genome.

A research team formed by Sander van Doorn (Santa Fe Institute, USA) and Mark Kirkpatrick (University of Texas at Austin, USA) suggests an answer to the puzzle of why sex chromosomes evolve so rapidly. In a theoretical study published in the October 17, 2007 issue of NATURE they demonstrate that sexual conflict can establish novel sex-determining genes and sex chromosomes. The proposed mechanism extends the established theory on the origin of sex chromosomes, and it explains how sex determination can move from an ancestral sex chromosome to an autosome, a non-sex-chromosome, that then invades to become a new sex chromosome.

The mechanism suggested by these authors begins with an autosome that carries two genes with particular features. One of these two genes is under sexually antagonistic selection. This means that some versions of the gene (alleles) are more beneficial in males than in females, while other alleles are more beneficial for females. The other gene influences the sex of the individual. Natural selection produces an association between the two genes an allele that is most beneficial in males will occur most often with the allele of the other gene that makes the individual male. It is then possible that this new male-making, male-benefiting (or female-making, female-benefiting) combination of genes spreads through the population, eventually replacing the old pair of sex chromosomes.

Genes with sexually antagonistic fitness effects and mutations that influence sex determination appear to be common in nature
'/>"/>

Contact: G.S. van Doorn
vandoorn@santafe.edu
505-946-2786
Santa Fe Institute
Source:Eurekalert

Page: 1 2

Related biology news :

1. Simple explanation for complex pattern of feather development
2. Nobel Laureate finds elegant explanation for DNA transcribing enzymes high fidelity
3. Family trees of ancient bacteria reveal evolutionary moves
4. Revolutionary nanotechnology illuminates brain cells at work
5. The evolutionary triumph of flower power
6. Multi-species genome comparison sheds new light on evolutionary processes, cancer mutations
7. The first laugh: New study posits evolutionary origins of two distinct types of laughter
8. Getting an evolutionary handle on life after reproduction
9. Evolutionary conservation of a mechanism of longevity from worms to mammals
10. Finding rewrites the evolutionary history of the origin of potatoes
11. Evolutionary biology research techniques predict cancer
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:9/18/2014)... A new GSA Bulletin study uses tree ... Puerco and Chaco Wash in northern New Mexico, USA. ... cedar and willow, investigators were able to precisely date ... then combined this data with aerial imagery, LiDAR, longitudinal ... these arroyos. , Arroyos are deep, oversized channels that ...
(Date:9/18/2014)... Mass. A novel robotic system that can operate ... being tested as part of a biomedical research partnership ... the aim of determining if the robot, in conjunction ... faster, more accurate, less costly, and less discomforting for ... to deliver prostate cancer therapies with greater precision. , ...
(Date:9/18/2014)... season that prompts millions of Americans to undertake jaunts into ... last a little longer within a century, according to new ... some areas of the United States as summer temperatures linger ... journal Global Ecology and Biogeography . For instance, the ... state tree of New Hampshire could change color one ...
Breaking Biology News(10 mins):Tree rings and arroyos 2Tree rings and arroyos 3Tree rings and arroyos 4Tree rings and arroyos 5Tree rings and arroyos 6Tree rings and arroyos 7Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 2Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 3Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 4Trial begins for MRI-compatible robot designed to improve accuracy of prostate biopsies 5Fall foliage season may be later, but longer on warmer Earth 2Fall foliage season may be later, but longer on warmer Earth 3Fall foliage season may be later, but longer on warmer Earth 4
... It is well known that plants growing under unfavourable conditions ... it is estimated that in the US, abiotic stress reduces ... A spectacular example of the effect of stress in ... by bonsai trees, in which every aspect of their stature, ...
... of invasive marine is one of many research results ... the First World Conference on Marine Biodiversity, Ciudad de ... report that invasive species of marine macroalgae spread at ... that covered by invasive terrestrial plants. The difference ...
... the changing fortunes of human societies in Asia have ... seasonal monsoons. A new paper published online ... that variations in monsoon climate over longer time scales ... the world,s highest. The climate over much of ...
Cached Biology News:The bonsai effect: Wounded plants make jasmonates, inhibiting cell division, stunting growth 2Marine invasive species advance 50km per decade, World Conference on Marine Biodiversity told 2Marine invasive species advance 50km per decade, World Conference on Marine Biodiversity told 3Marine invasive species advance 50km per decade, World Conference on Marine Biodiversity told 4Sedimentary records link Himalayan erosion rates and monsoon intensity through time 2Sedimentary records link Himalayan erosion rates and monsoon intensity through time 3
(Date:9/19/2014)... NEW YORK , Sept. 19, 2014  An ... common forms of inherited neuropathies – Charcot-Marie-Tooth disease (CMT) ... feet and legs, causing extreme muscle atrophy, weakness, and ... in the US and millions worldwide. CMT is a ... use of their legs, requiring mobility devices such as ...
(Date:9/19/2014)... , Sept. 19, 2014  Nektar Therapeutics (NASDAQ: ... preclinical studies characterizing the analgesic profiles of a ... opioid receptor agonist molecules. The preclinical research candidates ... chemistry platform. The analgesic properties of ... medical literature. 1,2 Kappa opioid receptors are ...
(Date:9/19/2014)... BioTech News Coverage: Progress made ... of studies and trials.  Companies in focus are: GenSpera ... LLY ), Gilead Sciences Inc. (NASDAQ: ... and Arena Pharmaceuticals Inc. (NASDAQ: ARNA) GenSpera, ... for the treatment of cancer, announced that the United ...
(Date:9/19/2014)... 2014 Cereal grain scientists, quality ... gather October 5–8, 2014, for the AACC International ... Center in Providence, Rhode Island. The comprehensive scientific ... food scientists, chemists, microbiologists, nutritionists, and those interested ... management. To date, 1,000 attendees have registered for ...
Breaking Biology Technology:September is Charcot-Marie-Tooth (CMT) Awareness Month - Scheduled events, activities and important partnerships announced throughout the month! 2Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 2Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 3Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 4Nektar Presents Positive Preclinical Data on Oral, Peripherally-Acting Kappa Agonist Molecules at 2014 American Academy of Pain Management Meeting 5Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 2Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 3Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 4Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 5Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 6Biotech Companies Pushing Sector Higher With Recent Therapeutic Advancements & Patent Approvals - Company Wins Summary Judgment For Prodrug Patent 7Latest Research on Cereal Grain Quality, Health Benefits and Food Production to be Presented During the AACC International Annual Meeting 2Latest Research on Cereal Grain Quality, Health Benefits and Food Production to be Presented During the AACC International Annual Meeting 3
... Amsterdam Molecular Therapeutics (Euronext: AMT), a leader ... it has filed,a request for re-examination of the Marketing ... Agency.,Glybera is a gene therapy for the genetic disorder ... dossier will be completed by the end of 2011. ...
... research with theme songs, a team from the National ... of Maryland (UMD) might be tempted to choose the ... for the promising, but still experimental nanocomposite fire retardants ... demonstrated that the more widely and uniformly dispersed nanoscale ...
... 2011 Waters Corporation (NYSE: WAT ) ... Center (GUMC) into its Centers of Innovation Program ... Amrita Cheema, PhD, the directors of this pioneering program ... in Washington, DC.   (Logo: http://photos.prnewswire.com/prnh/20110707/NE31586LOGO) ...
Cached Biology Technology:Amsterdam Molecular Therapeutics Files Glybera® European Marketing Application for Re-examination 2Promising fire retardant results when clay nanofiller has space 2Waters Recognizes Albert J. Fornace Laboratory at Georgetown University Medical Center as a Center of Innovation 2Waters Recognizes Albert J. Fornace Laboratory at Georgetown University Medical Center as a Center of Innovation 3Waters Recognizes Albert J. Fornace Laboratory at Georgetown University Medical Center as a Center of Innovation 4Waters Recognizes Albert J. Fornace Laboratory at Georgetown University Medical Center as a Center of Innovation 5
Collected from sexually mature, mixed sex, mixed breed guinea pigs. Pricing: $120/unit for 1 - 10 units...
...
... Protein, 1. Based on the methodology ... kit gives essentially colorless backgrounds in ... Protein provides convenient, reproducible and sensitive ... in less than two hours.The visualization ...
Mouse monoclonal [IFR0104] to Salmonella enteriditis ( Abpromise for all tested applications)....
Biology Products: