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:6/14/2017)... PARIS , June 15, 2017  IBM (NYSE: IBM ... the international tech event dedicated to developing collaboration between startups ... on June 15-17. During the event, nine startups will ... deliver value in various industries. ... in the international market, with a 30 percent increase in ...
(Date:5/16/2017)...   Bridge Patient Portal , an enterprise ... EMR Systems , an electronic medical record solutions ... established a partnership to build an interface between ... Centricity™ products, including Centricity Practice Solution (CPS), Centricity ... new integrations will allow healthcare delivery networks using ...
(Date:4/19/2017)... The global military biometrics market ... by the presence of several large global players. The ... major players - 3M Cogent, NEC Corporation, M2SYS Technology, ... 61% of the global military biometric market in 2016. ... military biometrics market boast global presence, which has catapulted ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... At its national board ... Suneel I. Sheikh, the co-founder, CEO and chief research scientist of Minnesota-based Advanced ... for membership in ARCS Alumni Hall of Fame . ASTER Labs is ...
(Date:10/11/2017)... ... 2017 , ... Personal eye wash is a basic first aid supply for any work environment, ... eye do you rinse first if a dangerous substance enters both eyes? It’s one less ... with its unique dual eye piece. , “Whether its dirt and debris, or an acid ...
(Date:10/11/2017)... ... October 11, 2017 , ... ... today it will be hosting a Webinar titled, “Pathology is going digital. Is ... , on digital pathology adoption best practices and how Proscia improves lab economics ...
(Date:10/11/2017)... LAGUNA HILLS, Calif. , Oct. 11, 2017  SkylineDx ... London (ICR) and University of Leeds ... to risk-stratify patients with multiple myeloma (MM), in a multi-centric ... The University of Leeds is the ... UK, and ICR will perform the testing services to include ...
Breaking Biology Technology: