Navigation Links
Ancient DNA helps clarify the origins of two extinct New World horse species

The Patagonian Hippidion horse genus and North American stilt-legged horses have found a new place on the evolutionary tree, according to a new article in the open access journal PLoS Biology. In the paper, Jaco Weinstock, Alan Cooper, and colleagues use ancient DNA to argue that the Hippidion genus is younger than previously thought and that American stilt-legged horses were American endemics, not Asian emigres. Their analysis has also whittled down the taxonomy of North American species to just two. "I think the biggest issue is that we showed the apparent lack of species diversity in North American horses in the Late Pleistocene - as horses are a poster child of evolution," says Cooper.

To explore the origins of the horses, the authors examined mitochondrial DNA (mtDNA) extracted from fossilized horse bones. Mitochondria, which have their own genome, contain a stretch of sequence that's useful for inferring evolutionary relationships: though the region undergoes high mutation rates, the patterns of mutations remain stable over thousands of generations. The mtDNA analysis of the South and North American horses provided evidence that stilt-legged horses, the Hippidion genus, and caballine, or true horses, all arose from a common lineage.

The authors showed that the Hippidion genus is only 3 million years old, a much more recent date than previously believed. "South American horses were thought to stem from a very old lineage of fossil forms in North America," Cooper says. "And instead, our data show that they probably diverged and moved into South America around three million years ago, during the great biotic interchange that occurred when the Panama Isthmus was established."

And while morphological similarities between American stilt-legged horses and certain Eurasian caballines (a group that includes both the domestic horse and the nearly extinct Przewalskii horse of Mongolia) suggest that the stilt-legged horses once trekked across the Be ring Strait, the new PLoS Biology study shows that the American and Eurasian horses' genomes are too distinct for this theory. "We found that the stilt-legged horse in North America was in fact a home-grown endemic, and had just converged morphologically, probably due to shared environments," Cooper explains.

The study also suggests that all the North American caballines--traditionally classified as multiple species based on their diverse size--belong to the same species. Thus, only two horse lineages lived in North America during the Late Pleistocene, the stilt-legged horses and the caballines. Though the different horses in each species "varied in size and shape quite a bit" regionally and temporally, Cooper explains, "we see no genetic evidence that these are different species."

If true, the study's new model could provide a tool for exploring how environmental adaptations give rise to morphological variation.

###

Citation: Weinstock J, Willerslev E, Sher A, Tong W, Ho SYW, et al. (2005) Evolution, systematics, and phylogeography of Pleistocene horses in the new world: A molecular perspective. PLoS Biol 3(8): e241.


'"/>

Source:PLoS Biology


Related biology news :

1. Ancient olfaction protein is shared by many bugs, offering new pest control target
2. Ancient immune defense mechanism is no match for HIV-1
3. Researchers Discover Ancient Origins Of Tuberculosis-causing Bacteria
4. Ancient DNA confirms single origin of Malagasy primates
5. Ancient anthropoid origins discovered in Africa
6. Ancient trans-Atlantic swarm brought locusts to the New World
7. Ancient humans brought bottle gourds to the Americas from Asia
8. Ancient DNA helps UF researchers unearth potential hemophilia therapy
9. Ancient DNA provides clues to the evolution of social behavior
10. Ancient ants arose 140-168 million years ago
11. Ancient fossil DNA found preserved in crystal
Post Your Comments:
*Name:
*Comment:
*Email:


(Date:4/24/2017)... WASHINGTON , April 24, 2017 ... counsel and partner with  Identity Strategy Partners, LLP ... "With or without President Trump,s March 6, ... Foreign Terrorist Entry , refugee vetting can be instilled ... refugee resettlement. (Right now, all refugee applications are ...
(Date:4/13/2017)... 2017 According to a new market research report ... Identity Administration, and Authorization), Service, Authentication Type, Deployment Mode, Vertical, and Region ... expected to grow from USD 14.30 Billion in 2017 to USD 31.75 ... ... MarketsandMarkets Logo ...
(Date:4/6/2017)... Forecasts by Product Type (EAC), ... End-Use (Transportation & Logistics, Government & Public Sector, Utilities ... Generation Facility, Nuclear Power), Industrial, Retail, Business Organisation (BFSI), ... you looking for a definitive report on the $27.9bn ... ...
Breaking Biology News(10 mins):
(Date:5/23/2017)... ... 2017 , ... NetDimensions has been ranked as a Leader ... Corporate Learning, 2017. , Aragon Research defines Leaders as organizations who possess comprehensive ... those strategies. NetDimensionsā€™ ranking as a Leader due to its strengths in: , ...
(Date:5/23/2017)... Diego, CA (PRWEB) , ... May 23, 2017 , ... ... matrix of polymeric molecules, can cause diverse pathologies ranging from food poisoning and catheter ... impact of biofilms is in the tens of billions of dollars per year, there ...
(Date:5/22/2017)... ... 22, 2017 , ... Cancer diagnostics and pathology workflow solution ... the Association for Pathology Informatics Annual Summit at the Wyndham Grand ... Cancer Diagnostic Cockpit and Consultation Portal, Inspirata will present research it led to ...
(Date:5/18/2017)... ... May 18, 2017 , ... Dr. Ralph Mobbs ... the Prince Of Wales Private Hospital. The procedure was performed on a 46-year-old ... failed conservative treatments prior to undergoing surgery. , The AxioMed viscoelastic disc is ...
Breaking Biology Technology: