Navigation Links
An ancestral link between genetic and environmental sex determination
Date:3/25/2011

Researchers from Osaka University and the National Institute for Basic Biology, Japan, have found a highly significant connection between the molecular mechanisms underlying genetic and environmental sex determination. The scientists report in the open-access journal PLoS Genetics the identification of a gene responsible for the production of males during environmental sex determination in the crustacean Daphnia.

Ways in which an individual organism's sex is determined are diverse among animal lineages and can be broadly divided into two major categories: genetic and environmental. In genetic sex determination (GSD), sex-specific differentiation results from intrinsic genetic differences between males and females, whereas environmental sex determination (ESD) relies upon environmental signals to induce male or female sex determination. In contrast to GSD models, the genetics of ESD organisms are poorly understood.

The researchers cloned Doublesex (Dsx) genes from Daphnia magna, a freshwater brachiopod crustacean that clones itself to produce males in response to certain environmental cues. The Dsx genes play an important role in controlling sexual differences in organisms using GSD such as nematodes, insects, and vertebrates. Knocking out one particular Dsx gene, DapmaDsx1, in male embryos resulted in the production of female traits including ovarian maturation, whereas ectopic expression of DapmaDsx1 in female embryos resulted in the development of male-like phenotypes.

The researchers infer that there is an ancient, previously unidentified link between genetic and environmental sex determination. This study was confined only to the role of Dsx in ESD, so it would be highly desirable to establish the link between the environmental signal and Dsx expression. However, this work lends support to the "Doublesex hypothesis" of sex determination, in which many different sorts of upstream regulatory pathways could converge on Dsx-family genes, which would serve as the basis of sexual differentiation mechanisms across the animal kingdom.


'/>"/>

Contact: Taisen Iguchi
taiseni@hotmail.co.jp
Public Library of Science
Source:Eurekalert

Related biology news :

1. Ancestral Eve crystal may explain origin of lifes left-handedness
2. Native Americans descended from a single ancestral group, DNA study confirms
3. Ancestral genome of present-day African great apes & humans had burst of DNA sequence duplication
4. Study provides explanation for connection between low birth weight and obesity later in life
5. The connection between a cells cytoskeleton and its surface receptors
6. New technology pinpoints genetic differences between cancer and non-cancer patients
7. Worldwide sulfur emissions rose between 2000-2005, after decade of decline
8. Gulf grows between research practice and participant preferences in genetic studies
9. Link between fracture prevention and treatment adherence not fully understood by patients
10. Genetic relationship between Hungarian and Turkish apricots confirmed
11. UNC scientists pinpoint link between light signal and circadian rhythms
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:3/23/2016)... Massachusetts , March 23, 2016 /PRNewswire/ ... im Interesse erhöhter Sicherheit Gesichts- und Stimmerkennung ... Xura, Inc. (NASDAQ: MESG ), ... bekannt, dass das Unternehmen mit SpeechPro zusammenarbeitet, ... aus der Finanzdienstleistungsbranche, wird die Möglichkeit angeboten, ...
(Date:3/21/2016)... -- Unique technology combines v ...   Xura, Inc. (NASDAQ: ... communications services, today announced it is working alongside SpeechPro ... particularly those in the Financial Services Sector, the ability ... a mobile app, alongside, and in combination with, traditional ...
(Date:3/15/2016)... -- --> --> According ... "Digital Door Lock Systems Market - Global Industry Analysis, Size, ... digital door lock systems market in terms of revenue was ... to grow at a CAGR of 31.8% during the period ... (MSMEs) across the world and high industrial activity driving inclusive ...
Breaking Biology News(10 mins):
(Date:5/25/2016)... Portland, Oregon (PRWEB) , ... May 25, 2016 ... ... Base Set features a variety of fracture-specific plating options designed to address fractures ... provide industry-leading fracture fixation solutions. , The Acumed Ankle Plating System 3 is ...
(Date:5/25/2016)... ... , ... Lady had been battling arthritis since the age of two and ... Lady’s owner Hannah sought the help of Dr Jeff Christiansen of Superior Veterinary ... ligament and help with the pain of Lady’s arthritis. Dr Christiansen suggested that in ...
(Date:5/24/2016)... ... 24, 2016 , ... Media Cybernetics, global image analysis leader, ... branding reflects a results-driven revitalization for a company with a renewed focus on ... a crisp, refreshed logo and a new web presence. , “I believe that ...
(Date:5/23/2016)... and LONDON , May 23, 2016 ... Could See Frontage Boost Efficiency by 40% - Frontage ... - Frontage Enforce Quality, Compliance and Traceability Within the Bioanalytical ... with labs in the United States and ... to be deployed across its laboratory facilities. In addition to ...
Breaking Biology Technology: