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


Page: 1 2

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:
TAG: Bird sex something else

(Date:7/10/2014)... , July 1, 2014 Smart ... way for convenience and improved security: NXT-ID, Inc. (OTCBB: NXTD), ... GOOG ), Apple Inc. (NASDAQ: AAPL ... Corporation (NYSE: MA) NXT-ID, Inc., (OTCQB: NXTD) a biometric ... to announce that the second series of 30 second spots ...
(Date:7/10/2014)... COMMACK, N.Y. , July 2, 2014 ... Inc. (ABD) to announce the appointment of the world-renowned ... its Board of Directors. Dr. Ginsburg, with ... two facilities: NY Presbyterian Hospital and Good Samaritan Regional ... Breathing Pacemaker since the late 1980,s and is considered ...
(Date:7/10/2014)... According to the new market research report, ... (Optical Prism, Pizeoelectric, Capacitive, and Adhesives), Application (Mobile Devices, ... and Geography - Global Trends & Forecasts to 2014 ... Market is projected to cross $14.35 Billion by 2020, ... to 2020. Browse more than 78 market ...
Breaking Biology News(10 mins):Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 2Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 3Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 4Advantages for Digital Wallets Eliminate Need to Carry Credit Cards - Large Scale CNBC Ad Campaign for Latest Smart Wallet to Commence July 7th 5Avery Biomedical Devices, Inc. announces the appointment of Mark E Ginsburg, M.D. to its Board of Directors 2Fingerprint Sensors Market worth $14.35 Billion by 2020 2Fingerprint Sensors Market worth $14.35 Billion by 2020 3
... presents Research & Entrepreneurship Day on April 30th, 2010 ... Stevens campus. R&E Day is a showcase of ... and student based research programs. It is also ... success in engineering solutions for the betterment of mankind. ...
... Tech biologist proposes to use a physics strategy called resonant ... they will be sensitive to antibiotics. In medicine, resonance ... thumps your chest. In physics, resonance is a periodic force ... a natural system,s frequency. Sound waves are an example of ...
... , A new study identifies cattle feed as a ... San Joaquin Valley a moderately-populated agricultural region ... ingredients in smog) than many densely-populated cities. The report, ... exhausts in forming ozone, is in ACS, Environmental ...
Cached Biology News:Research & Entrepreneurship Day 2010: Engineering Innovation 2Physics strategy tested as solution for antibiotic resistance 2
(Date:7/10/2014)... Terascala, the industry leader in ... a former vice president of product management for Flexera ... of marketing. Terascala’s software when combined with leading compute ... highest performance and most reliable solutions for processing big ... channel expansion and broaden its product portfolio. His leadership ...
(Date:7/10/2014)... 2014 Robert Harman, DVM, Founder and CEO ... proud to announce the relaunch of his highly informative blog, ... series called “ What are Stem Cells ?” Dr. ... straightforward foundation in the basics of stem cell therapy so ... right type of treatment when considering regenerative medicine. , A ...
(Date:7/10/2014)... EvoDerma ’s NOOME Anti-Aging Motion has been upgraded ... with a second treatment cup to help prevent and smooth ... is thinner on the edges for a softer contact with ... uneven surfaces on the face, neck and décolleté. Choose to ... areas such as the cheeks and neck, or opt for ...
(Date:7/10/2014)... POINT, Ind. , July 10, 2014 ... expanded its use of capnography for respiratory ... growing group of healthcare leaders in embracing ... measures how effectively patients are breathing and ... depression occurs. By measuring the amount of ...
Breaking Biology Technology:Terascala Expands Executive Team 2Terascala Expands Executive Team 3Robert Harman, DVM Talks About What Stem Cells are in His Latest Blog Series for Vet-Stem, Inc. 2Robert Harman, DVM Talks About What Stem Cells are in His Latest Blog Series for Vet-Stem, Inc. 3Introducing a New Bonus Treatment Cup for EvoDerma’s NOOME Anti-Aging Motion 2Franciscan St. Anthony Health-Crown Point Underscores Patient Safety Commitment Through Expanded Use of Capnography 2
... MELBOURNE, Australia, Oct. 5 Cytopia Limited (ASX: CYT) ... BioSciences Inc. ("YM") have signed an exclusive and binding ... YM will acquire all of the issued shares and ... scheme(s) of arrangement ("Scheme(s)") and shareholders (and optionholders if ...
... Corporation (NYSE: BSX ) today announced its exclusive ... This new trial follows in the tradition of ... each exclusively sponsored by Boston Scientific and conducted under ... Professor of Medicine at the University of Rochester. , ...
... , UPPSALA, Sweden, October 5 ... SuperConvection(TM), - At One Sixth the Price of ... of PCR Expected to Rapidly Penetrate the Market , ... developed a,miniaturized PCR-instrument - AmpXpress(TM) - to meet demands for lower,instrument ...
Cached Biology Technology:Cytopia Merger with Toronto-based YM BioSciences Inc. 2Cytopia Merger with Toronto-based YM BioSciences Inc. 3Cytopia Merger with Toronto-based YM BioSciences Inc. 4Cytopia Merger with Toronto-based YM BioSciences Inc. 5Cytopia Merger with Toronto-based YM BioSciences Inc. 6Cytopia Merger with Toronto-based YM BioSciences Inc. 7Boston Scientific Announces Exclusive Sponsorship and First Enrollments of MADIT-RIT Clinical Trial 2Boston Scientific Announces Exclusive Sponsorship and First Enrollments of MADIT-RIT Clinical Trial 3AlphaHelix Presents AmpXpress(TM) at the BIOTECHNICA Show 2
... Microarrays designed for genome-wide microRNA ... flexible and powerful Paraflo microfluidic on-chip ... as part of our comprehensive microRNA ... Content The Soil Nematode microRNA ...
... to the maintenance of appropriate levels ... important and diverse as those involved ... stress response, antigen presentation, modulation of ... cell cycle regulation, transcription, and signalling ...
... modified digital scanner serves as the spot-picking ... five standard rack positions on the tray, ... well plates on the remaining two racks.,The ... spots by mouse-click on the scanned gel ...
... Cleanroom-grade vinyl curtains or ... powder-coated steel support frame to ... cleanroom that meets cleanliness to ... HEPA filter/fan units, lights, and ...
Biology Products: