Navigation Links
Getting under the shell of the turtle genome

The genome of the western painted turtle (Chrysemys picta bellii) one of the most widespread, abundant and well-studied turtles in the world, is published this week in Genome Biology. The data show that, like turtles themselves, the rate of genome evolution is extremely slow; turtle genomes evolve at a rate that is about a third that of the human genome and a fifth that of the python, the fastest lineage analyzed.

As a group, turtles are long-lived, can withstand low temperatures including freezing solid, can survive for long periods with no oxygen, and their sex is usually determined by the temperature at which their eggs develop rather than genetically. The painted turtle is most anoxia-tolerant vertebrate and can survive up to four months under water depending on the temperature. Turtles and tortoises are also the most endangered major vertebrate group on earth, with half of all species listed as endangered. This is the first turtle, and only the second non-avian reptile genome to be sequenced, and the analysis reveals some interesting insights about these bizarre features and adaptations, many of which are only known in turtles.

The western painted turtle is a freshwater species, and the most widespread turtle native to North America. Bradley Shaffer and colleagues place the western painted turtle genome into a comparative evolutionary context, showing that turtles are more closely related to birds and crocodilians than to any other vertebrates. They also find 19 genes in the brain and 23 in the heart whose expression is increased in low oxygen conditions including one whose expression changes nearly 130 fold. Further experiments on turtle hatchlings indicated that common microRNA was involved in freeze tolerance adaptation.

This work consistently indicates that common vertebrate regulatory networks, some of which have analogs in human diseases, are often involved in the western painted turtle achieving its extraordinary physiological capacities. The authors argue that the painted turtle may offer important insights into the management of a number of human health disorders, particularly those involved with anoxia and hypothermia.

Contact: Dr. Hilary Glover
BioMed Central

Related biology news :

1. Why getting healthy can seem worse than getting sick
2. Light weights are just as good for building muscle, getting stronger, researchers find
3. Scripps Florida scientists identify neurotranmitters that lead to forgetting
4. University of Tennessee anthropologists find American heads are getting larger
5. Carbon is key for getting algae to pump out more oil
6. Getting to the root -- unearthing the plant-microbe quid pro quo
7. For young birds, getting stressed out can be a good thing
8. Getting (drugs) under your skin
9. Texas cotton getting a genetic tune-up
10. Overweight pregnant women not getting proper weight-gain advice
11. Cheating -- and getting away with it
Post Your Comments:
(Date:11/17/2015)... Paris from 17 th until 19 th ... from 17 th until 19 th November 2015.   ... the first combined scanner in the world which scans both ... two different scanners were required: one for passports and one ... same surface. This innovation is an ideal solution for electronic ...
(Date:11/12/2015)... Nov. 12, 2015  A golden retriever that stayed ... dystrophy (DMD) has provided a new lead for treating ... the Broad Institute of MIT and Harvard and the ... . Cell, pinpoints a protective ... the disease,s effects. The Boston Children,s lab of ...
(Date:11/10/2015)... 2015 About signature verification ... to identify and verify the identity of an ... the secure and accurate method of authentication and ... individual because each individual,s signature is highly unique. ... dynamic signature of an individual is compared and ...
Breaking Biology News(10 mins):
(Date:11/24/2015)... Malaysia , Nov. 24, 2015  Asia-Pacific ... contract research organisation (CRO) market. The trend of ... in lower margins but higher volume share for ... capacity and scale, however, margins in the CRO ... Organisation (CRO) Market ( ), finds ...
(Date:11/24/2015)... ... November 24, 2015 , ... Copper is an essential ... bound to proteins, copper is also toxic to cells. With a $1.3 million ... (WPI) will conduct a systematic study of copper in the bacteria Pseudomonas aeruginosa ...
(Date:11/24/2015)... PHILADELPIA, PA (PRWEB) , ... November 24, 2015 , ... ... young entrepreneurs at competitive events in five states to develop and pitch their BIG ... student projects from each state are competing for votes to win the title of ...
(Date:11/24/2015)... QUEBEC CITY , Nov. 24, 2015 /PRNewswire/ ... (the "Company") announced today that the remaining 11,000 ... Common Share Purchase Warrants (the "Series B Warrants") ... agreement were exercised on November 23, 2015, which ... Common Shares.  After giving effect to the issuance ...
Breaking Biology Technology: