Navigation Links
Male or female?
Date:4/23/2014

This news release is available in French and German.

Man or woman? Male or female? In humans and other mammals, the difference between sexes depends on one single element of the genome: the Y chromosome. It is present only in males, where the two sexual chromosomes are X and Y, whereas women have two X chromosomes. Thus, the Y is ultimately responsible for all the morphological and physiological differences between males and females.

But this has not always been the case. A very long time ago, the X and Y were identical, until the Y started to differentiate from the X in males. It then progressively shrank to such an extent that, nowadays, it only contains about 20 genes (the X carries more than one thousand genes). When did the Y originate and which genes have been kept? The answer has just been brought to light by the team of Henrik Kaessmann, Associate Professor at the CIG (UNIL) and group leader at the SIB Swiss Institute of Bioinformatics, and their collaborators in Australia. They have established that the first sex genes appeared concomitantly in mammals around 180 million years ago.

4,3 billion genetic sequences

By studying samples from several male tissues in particular testicles from different species, the researchers recovered the Y chromosome genes from the three major mammalian lineages: placentals (which include humans, apes, rodents and elephants), marsupials (such as opossums and kangaroos) and monotremes (egg-laying mammals, such as the platypus and the echidna, a kind of Australian porcupine). In total, the researchers worked with samples from 15 different mammals, representi
'/>"/>

Contact: Irene Perovsek
irene.perovsek@isb-sib.ch
41-216-924-054
Swiss Institute of Bioinformatics
Source:Eurekalert

Page: 1 2 3

Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/30/2014)... is a subject of major interest in neuroscience. ... during the distinct stages of Wallerian degeneration: transcription ... dedifferentiation. Although gene expression responses in the distal ... injury are known, differences in gene expression between ... Dengbing Yao and co-workers from Nantong University, China ...
(Date:7/30/2014)... multitude of cells types. Researchers would like to understand how ... cells that make up the organs and other structures of ... chains of sugars that dangle from proteins on surfaces of ... San Diego, has created synthetic molecules that can stand in ... to direct the process, they report in the Journal ...
(Date:7/30/2014)... scientists unveiled the first high-resolution map of the ... country of Per. The new and improved methodology ... change for future market-based carbon economies. The ... ecological diversity and it provides the critical input ... conservation, land use, and enforcement purposes. The technique ...
Breaking Biology News(10 mins):Peru's carbon quantified: Economic and conservation boon 2Peru's carbon quantified: Economic and conservation boon 3
... to John Ellis for his pioneering contributions to biochemistry, ... Professor in the Department of Biological Sciences at the ... of the Springer book How Science Works: Evolution. Dr. ... London, and completed postdoctoral studies at Oxford University. In ...
... centuries-old religious ceremony of an indigenous people in southern Mexico ... of fish, according to researchers from Texas A&M University. ... World, the Zoque people of southern Mexico would venture each ... Cueva del Azufre to implore their deities for a bountiful ...
... most frustrating problems faced by doctors who treat pancreatic cancer ... 38,000 people in the United States die of the disease ... For almost three decades, scientists and physicians have known ... virtually all pancreatic cancers, making it an important target for ...
Cached Biology News:Moved by religion: Mexican cavefish develop resistance to toxin 2Moved by religion: Mexican cavefish develop resistance to toxin 3UNC team discovers promising target for new pancreatic cancer treatments 2
(Date:7/29/2014)... SoundConnect , an award ... proud to announce the strategic additions of implementation, ... Boston, Charleston and Atlanta offices. SoundConnect’s organizational ... for hosted solutions, collaboration and mobility that improve ... , SoundConnect was founded in 2004, with the ...
(Date:7/29/2014)... number of significant technological challenges in their quest ... created for the James Webb Space Telescope. , ... a scientist at NASA,s Goddard Space Flight Center ... microshutter arrays that is, those activated by ... as the current technology,s magnetically activated arrays. This ...
(Date:7/29/2014)... 29, 2014   Sequenom, Inc. (NASDAQ: ... innovative genetic analysis solutions, and Mayo Medical Laboratories ... in the United States , have ... and applications. "We have great appreciation for ... and we welcome the opportunity to partner with the ...
(Date:7/29/2014)... Quantum Cheshire Cat: Can a particle be separated from ... Nature Communications , published the results of the first ... field, conducted by Chapman University in Orange, CA, and ... seen a cat without a grin," thought Alice in ... most curious thing I ever saw in my life!" ...
Breaking Biology Technology:SoundConnect Organization and Culture is Evolving 2Revolutionary microshutter technology hurdles significant challenges 2Revolutionary microshutter technology hurdles significant challenges 3Revolutionary microshutter technology hurdles significant challenges 4Sequenom Enters Into License Agreement With Mayo Medical Laboratories 2Sequenom Enters Into License Agreement With Mayo Medical Laboratories 3Sequenom Enters Into License Agreement With Mayo Medical Laboratories 4The quantum Cheshire cat: Scientists separate a particle from its properties 2The quantum Cheshire cat: Scientists separate a particle from its properties 3The quantum Cheshire cat: Scientists separate a particle from its properties 4
... Enlarge and Worsen Over Time , , CHICAGO, June 15 ... enlarged leg veins as a cosmetic issue without recognizing they can ... their doctors for other health symptoms, Vein Clinics of America is ... from affecting their everyday routine. , , To view the ...
... 15 /PRNewswire-FirstCall/ - Oncothyreon Inc. (Nasdaq: ... appointment of Scott Peterson, Ph.D., as Vice President, ... Dr. Peterson will be responsible for overseeing those ... will support the advancement of the Company,s pipeline ...
... June 15 Congressional Quarterly presents a 360-degree look ... follow-on versions of biotech drugs. This CQ Forum will ... groups, and leading researchers regarding the complex structures of ... Will the availability of these products save money for ...
Cached Biology Technology:Video: Varicose Veins, Much More Than a Cosmetic Issue, Can Prove a Health Risk 2Video: Varicose Veins, Much More Than a Cosmetic Issue, Can Prove a Health Risk 3Video: Varicose Veins, Much More Than a Cosmetic Issue, Can Prove a Health Risk 4Oncothyreon appoints Scott Peterson as Vice President of Research and Development 2Oncothyreon appoints Scott Peterson as Vice President of Research and Development 3
... >95%NEN Radiolabeled Ligands\n\nReceptor-related research has long been ... radiolabeled ligands selected to keep pace with ... of products and services for receptor research ... radioligands. If you do not find exactly ...
... Software reads and processes raw ... microarray data for analysis. ... one 2-year license for Feature ... , * one CD-ROM ...
Anti-WT-1 Liquid. In 10 μM PBS, 0.2 % BSA, pH 7.6. Recognizes the ~47-55 kDa Wilm's tumor protein in Wilm's tumor tissue. ...
... optimized for siRNA applications, contains magnetic nanoparticles ... nucleic acid of interest. Exploiting magnetic force ... rapidly drawn towards and delivered into the ... Reagent can be used for adherent cells; ...
Biology Products: