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 cou
'/>"/>

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

Page: 1 2

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:7/9/2014)... fungal pathogens pose a greater threat to biodiversity ... of amphibians, bats, corals, bees and snakes. New ... in the prestigious journal Nature reveals ... to a deadly chytrid fungus implicated in global ... important because it is the basis of vaccination ...
(Date:7/9/2014)... Guelph scientist that involved fitting bumblebees with tiny ... neonicotinoid pesticide hampers bees, ability to forage for ... professor in Guelph,s School of Environmental Sciences, and ... July 9 in the British Ecological Society,s journal ... how long-term pesticide exposure affects individual bees, day-to-day ...
(Date:7/9/2014)... fever but often can be defeated with antibiotics and ... beat. Now, scientists have built a new weapon against such ... the journal ACS Applied Materials & Interfaces , their ... of them than medicine alone. , David Leong, Jianping Xie ... wait, undetectable in the human body or in places that ...
Breaking Biology News(10 mins):USF study: Amphibians can acquire resistance to deadly fungus 2Bee foraging chronically impaired by pesticide exposure: Study 2
... why a tuberculosis vaccine is not as effective for some ... not work as well for some as they do for ... issue of the Journal of Leukocyte Biology ( ... common environmental bacterium found in soil and water, can decrease ...
... State University have solved a long-standing conundrum about ... way into limestone, sand grains, mussel shells, coral ... According to the lead investigator, ASU professor ... what is "at the heart of an erosive ...
... New Rochelle, NY, November 30, 2010Access to quality reproductive ... aspect of a woman,s human rights, freedom, equity, and ... on Global Women,s Reproductive Health in the current issue ... by Mary Ann Liebert, Inc., explores the compelling medical, ...
Cached Biology News:Blame the environment: Why vaccines may be ineffective for some people 2Mystery dissolves with calcium pump discovery 2Mystery dissolves with calcium pump discovery 3Ensuring the rights of women worldwide to reproductive health care 2
(Date:1/14/2014)... Bellingham, Washington, USA, and Cardiff, UK (PRWEB) January 13, ... and photonics technology development leader with more than 20 ... international society for optics and photonics . Hainsey will ... “We are delighted to have Dr. Hainsey join SPIE ...
(Date:1/14/2014)... NY (PRWEB) January 14, 2014 During the ... now known as “The Doctor’s Plague.” In this time period, ... hands. This led, at times, to the death of vulnerable ... today don’t know that they may be unwittingly transmitting herpes ...
(Date:1/14/2014)... January 14, 2014 BioMedomics, Inc. , ... POC diagnostic platforms and novel disease specific POC tests, announced ... financing netting a total of $690,000. The investment is from ... the company. This group of private investors has significant successful ...
(Date:1/14/2014)... Translational Biosciences, a subsidiary of ... trial approval for the treatment of rheumatoid arthritis ... from the Comité Nacional de Bioética de la ... (RA) is an autoimmune disease in which the ...
Breaking Biology Technology:Photonics R&D Leader Bob Hainsey Joins SPIE Technical Staff 2Study: Fatigued Medical Interns Infect Their Patients with Herpes Viruses; The CBCD Sees a Parallel with “The Doctor’s Plague” 2Study: Fatigued Medical Interns Infect Their Patients with Herpes Viruses; The CBCD Sees a Parallel with “The Doctor’s Plague” 3BioMedomics, Inc. Closes $690K Round of Financing 2Panama’s First Umbilical Cord Stem Cell Clinical Trial for Rheumatoid Arthritis Approved by Comité Nacional de Bioética de la Investigación Institutional Review Board 2Panama’s First Umbilical Cord Stem Cell Clinical Trial for Rheumatoid Arthritis Approved by Comité Nacional de Bioética de la Investigación Institutional Review Board 3
... ("CTI") (Nasdaq and MTA: CTIC) announced today that it has been ... posted by Russell Investments on June 29, 2009 on ... and global equity indexes on an annual basis. , ... largest U.S. stocks as of the last trading day of May, ...
... Corp. (Nasdaq: BSTC ), a biopharmaceutical company developing ... added to the Russell 3000 and Russell 2000 Indexes effective ... 2009. The Russell family of U.S. indexes is reconstituted annually ... investable U.S. equity market. , , The Russell 3000 ...
... Micromet, Inc. (Nasdaq: MITI ), a ... of cancer, inflammation and autoimmune diseases, today announced that ... part of the annual reconstitution of the Russell indexes, ... "Investors recognize the Russell 3000 as an established benchmark ...
Cached Biology Technology:Cell Therapeutics Added to Russell 3000(R), Russell 2000(R) and Russell Global(R) Indexes 2Cell Therapeutics Added to Russell 3000(R), Russell 2000(R) and Russell Global(R) Indexes 3BioSpecifics Technologies Corp. Added to Russell 3000 and Russell 2000 Indexes 2Micromet Added to Russell 3000 Index 2Micromet Added to Russell 3000 Index 3Micromet Added to Russell 3000 Index 4
One-step, microplate or cuvet, colorimetric, detection range 0.78 ug/dL to 65 ug/dL Zn in serum, plasma, urine, saliva etc. Procedure: 10 min....
Zebrafish Ephrin-B2 Biotinylated Affinity Purified PAb...
... Customer Peptide Synthesis , Containing one Phospho-Amino Acid ... returned to customer conjugation of peptide to KLH protein , ... 102 days/each , Pre-immune bleed x1 /each ... Test bleed (app. 5 ml) x1 /each ...
The Varian 4000 GC/MS system offers three easily switchable ionization configurations: internal ionization (II), external ionization (EI) or hybrid chemical ionization (CI)...
Biology Products: