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:12/15/2016)... 2016 "Increase in mobile transactions is driving ... biometrics market is expected to grow from USD 4.03 ... at a CAGR of 29.3% between 2016 and 2022. ... growing demand for smart devices, government initiatives, and increasing ... component is expected to grow at a high rate ...
(Date:12/7/2016)... , December 7, 2016 According to a new ... Learning), Software Tool (Facial Expression, Voice Recognition), Service, Application Area, End User, And ... estimated to grow from USD 6.72 Billion in 2016 to USD 36.07 Billion ... Continue Reading ... ...
(Date:12/6/2016)... WARSAW, Ind. , Dec. 6, 2016  Zimmer Biomet ... that it has priced an offering of €500.0 million principal ... €500.0 million principal amount of its 2.425% senior unsecured notes ... is expected to occur on December 13, 2016, subject to the ... on an annual basis. ...
Breaking Biology News(10 mins):
(Date:1/13/2017)... ... January 13, 2017 , ... FireflySci, in response ... customers three new solutions for measurements where traditional cuvette applications are not convenient. ... has an oddly-shaped sample that would not fit into a typical cuvette inside ...
(Date:1/12/2017)... ... January 12, 2017 , ... Each year, Crain’s Detroit Business News ranks ... that evaluates the patent estate of a company, its impact and significance, and the ... leading the way in technologies that transform energy sources such as low dose X-ray ...
(Date:1/12/2017)... (PRWEB) , ... January 12, 2017 , ... Huffman ... of Stephen Beck, who will work in the company’s Lincoln office as a chemical ... processes to design control systems for customers in the life science manufacturing and water/wastewater ...
(Date:1/12/2017)... WASHINGTON, DC , January 12, 2017 ... set up the world,s biggest facility for producing mycorrhizae. ... translated the nutrient tapping potential of mycorrhizae and developed ... ...      (Logo: http://mma.prnewswire.com/media/456932/PRNE_TERI_Logo.jpg) The TERI ...
Breaking Biology Technology: