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:2/21/2017)... 2017 Der weltweite Biobanking-Sektor wird ... einem Gespräch mit mehr als 50 Vertretern aus verschiedenen Branchen ... gilt, um diese Prognose zu realisieren. ... Zu den ... finanziellen Mittel für die Biobank, die Implementierung Zeit sparender ...
(Date:2/14/2017)... , Feb. 14, 2017  Wake Forest Baptist ... as its new chief executive officer (CEO). Freischlag joins ... John D. McConnell , M.D., who last year ... at the Medical Center, after leading it since 2008. ... full scope of Wake Forest Baptist,s academic health system, ...
(Date:2/13/2017)... 13, 2017 Former 9/11 Commission border counsel ... Janice Kephart of Identity Strategy Partners, LLP, ... Trump,s "Executive Order: Protecting the Nation From Foreign ... "As President Trump,s ,Travel Ban, Executive Order ... essentially banned the travel ban, it is important that ...
Breaking Biology News(10 mins):
(Date:3/27/2017)... , March 27, 2017  The global market ... 2016, according to a new report from Kalorama ... testing is performed to evaluate disease progression, monitor ... among other reasons.  The healthcare market research firm,s ... , provides an overview of the medical laboratory ...
(Date:3/27/2017)... 2017  Trovagene, Inc. (NASDAQ: TROV), a precision medicine ... Bill Welch , will be presenting at this ... AM EDT at the Essex House in ... Scientific Officer, Mark Erlander , Ph.D., will also ... The presentation will be webcast live at ...
(Date:3/24/2017)... Research and Markets has announced the addition ... Strategic Business Report" report to their offering. ... This report analyzes the Global ... Annual estimates and forecasts are provided for the period 2014 through ... research. The report profiles 25 companies including many ...
(Date:3/23/2017)... ... March 23, 2017 , ... AxioMed president, Jake Lubinski, describes ... characteristics when deformed, which is identical to how the human discs work to ... and return to its natural state along a hysteresis curve, exactly like a ...
Breaking Biology Technology: