Navigation Links
Bird sex is something else

We’ve all heard about the birds and the bees. But apparently when it comes to birds, they have an unusual take on his and hers ?and the difference is genetic. Species with differentiated sex chromosomes (X and Y in humans, for example) get around the fact that males and females get different-sized portions of sex chromosome genes with a balancing act geneticists call dosage compensation. But research published today in the Journal of Biology shows that birds are extraordinary, because some bird genomes can live with an apparent overdose of sex-related genes.

US researchers Itoh, Melamed et al. working in Arthur Arnold’s University of California, Los Angeles laboratory used RNA microarray analysis for their dosage compensation study. The team sampled chickens and zebra finches, and compared the results with data from humans and mice. In several types of finch and embryonic chicken brain tissue, Z chromosome genes were expressed up to 40% higher in ZZ males than ZW females. This contrasts with findings from the mammal samples, where dosage compensation meant that the male: female ratio of X-linked genes is similar to that of autosomal genes.

In mammals, mismatched doses of X genes between males and females threaten to upset the gene network in one or both sexes. Fruit flies (Drosophila), roundworms (C. elegans) and humans each work around this dosage problem using different molecular pathways. By contrast, for birds it appears that most genes on the Z chromosome are not fully dosage-compensated, at least at the transcriptional level.

The study challenges current thinking about the role and mechanisms of dosage compensation in species with heteromorphic sex chromosomes. "Unlike mammals, birds have an ineffective dosage compensation," says Arnold. "The finding is surprising because dosage compensation was previously thought to be critical for survival. Birds, however, seem to be doing just fine without sexual equality of Z gene expression".
'"/>

Source:BioMed Central


Related biology news :

1. Theres something fishy about human brain evolution
2. Psst! Coffee drinkers: Fruit flies have something to tell you about caffeine

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/22/2016)... -- On Monday, the Department of Homeland Security (DHS) ... for the Biometric Exit Program. The Request for Information ... explains that CBP intends to add biometrics to confirm ... States , in order to deter visa overstays, ... Logo - http://photos.prnewswire.com/prnh/20160622/382209LOGO ...
(Date:6/16/2016)... , June 16, 2016 ... is expected to reach USD 1.83 billion by ... View Research, Inc. Technological proliferation and increasing demand ... are expected to drive the market growth. ... The development of advanced multimodal techniques ...
(Date:6/9/2016)... -- Paris Police Prefecture ... to ensure the safety of people and operations in several ... tournament Teleste, an international technology group specialised in ... that its video security solution will be utilised by ... safety across the country. The system roll-out is scheduled for ...
Breaking Biology News(10 mins):
(Date:12/2/2016)...  The Multiple Myeloma Research Foundation (MMRF) today announced ... SM —the largest and most comprehensive study driving new ... be presented at the 58 th American Society ... San Diego from December 3-6. The ... well as identify pathways and targets for new drug ...
(Date:12/2/2016)... ... 01, 2016 , ... ACEA Biosciences, Inc. announced today that it will be ... at the World Conference on Lung Cancer 2016, taking place in Vienna, Austria December ... clinical trials for AC0010 in patients with advanced non-small cell lung cancer harboring the ...
(Date:12/2/2016)... ... ... The Conference Forum has announced that the 3rd annual Immuno-Oncology 360° ... 1-3, 2017 at the Roosevelt Hotel in New York City. Led by advisors Dr ... approach, which addresses the most up-to-date information regarding business aspects, clinical advancements and scientific ...
(Date:12/2/2016)... ... ... Robots will storm the Prudential Center in Boston, MA during the ... held on the United Nations International Day of Persons with Disabilities, will highlight the ... Technologies is partnering with NTI to showcase how technology can help individuals with severe ...
Breaking Biology Technology: