HOME >> BIOLOGY >> NEWS
Millennia still mean early days for newly identified sex chromosome

A little fish called the threespine stickleback may help scientists understand how sex chromosomes evolve. Researchers have found that threespine sticklebacks have a Y chromosome that is less than ten-million years old, which is quite young in evolutionary time.

The evolution of a genetic sex-determination system is often accompanied by the evolution of sex chromosomes. Over the last century, insightful theoretical work has provided models for why sex chromosomes evolve and the genetic forces that shape their evolution. Recently, the complete sequencing of the human Y chromosome revealed a detailed picture of a three-hundred-million year old sex chromosome, but this does not explain how sex chromosomes begin to form in the first place. Some experimental data from young sex chromosome systems in plants and insects suggest that there are common themes underlying the formation of sex chromosomes. However, to determine if these mechanisms are generally applicable, more examples, particularly from other taxa, are needed.

In new work, Dr. Catherine Peichel and colleagues at the Fred Hutchinson Cancer Research Center, along with Dr. David Kingsley and colleagues at the Stanford University School of Medicine, have found that threespine stickleback fish have a genetic sex-determination system in which females are XX and males are XY. They provide evidence that even though the threespine stickleback Y chromosome is less than ten-million years old, it already has many hallmarks of a typical sex chromosome including poor homology with the X chromosome due to the presence of numerous repetitive elements on the Y chromosome. Future comparative analysis of this vertebrate Y chromosome with other evolving sex chromosome systems in plants, insects, and other fish will provide insight into the general mechanisms that shape the evolution of sex chromosomes.


'"/>

Contact: Heidi Hardman
hhardman@cell.com
617-397-2879
Cell Press
23-Aug-2004


Page: 1

Related biology news :

1. One-hundred-fifty year old lessons of John Snow still relevant today
2. Clinical judgement still counts strongly alongside genetic testing
3. Goal of ocean iron fertilization said still unproved
4. Copper may play role in starving cancer to standstill
5. New evidence suggests that monkey thought extinct still exists
6. Beagle 2 team still hopes to repeat Mars landing success
7. Governing commons still a struggle, but fight not without hope, according to new report
8. Americans knowledge of genetically modified foods remains low and opinions on safety still split
9. Global analysis finds a large portion of the earth is still wilderness
10. Leaf fall in ancient polar forests still a mystery
11. Lead poisoning still threatens albatross chicks on Midway Atoll

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/28/2017)... , March 28, 2017 The ... Hardware (Camera, Monitors, Servers, Storage Devices), Software (Video Analytics, ... Region - Global Forecast to 2022", published by MarketsandMarkets, ... 2016 and is projected to reach USD 75.64 Billion ... and 2022. The base year considered for the study ...
(Date:3/24/2017)... The Controller General of Immigration from Maldives Mr. Mohamed Anwar ... the prestigious international IAIR Award for the most innovative high security ePassport ... ... Maldives Immigration Controller General, Mr. ... on the right) have received the IAIR award for the "Most innovative ...
(Date:3/23/2017)... , March 23, 2017 The report "Gesture Recognition ... Biometric), Industry, and Geography - Global Forecast to 2022", published by MarketsandMarkets, the ... a CAGR of 29.63% between 2017 and 2022. ... ... ...
Breaking Biology News(10 mins):
(Date:4/20/2017)... , ... April 20, 2017 , ... NetDimensions appoints Bill ... , With over 20 years of experience in the learning technologies industry, Mastin joins ... company within Learning Technologies Group plc (LTG). At LEO, Mastin served as SVP of ...
(Date:4/20/2017)... ... April 20, 2017 , ... Open Therapeutics ... property (IP) sharing and commercialization model. , The Center for Advancing Innovation helps ... of this effort is bringing the IP to the attention of the entrepreneurial ...
(Date:4/19/2017)... (PRWEB) , ... April 18, 2017 , ... ... 1970s and has been a key device for generating monodisperse droplets of known ... droplet processes and for generating monodisperse solid particles by drying monodisperse droplets. ...
(Date:4/19/2017)... ... April 19, 2017 , ... Nobilis Therapeutics Announces ... Seeks to Leverage Clinical Data in its Upcoming Post Traumatic Stress Disorder Trial , ... 81 patient clinical trial assessing efficacy of its NBTX-001, a xenon-based therapeutic in the ...
Breaking Biology Technology:
Cached News: