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Turtles next to lizards on family tree, discovery based on microRNAs shows

Date:
July 26, 2011
Source:
Mount Desert Island Biological Laboratory
Summary:
For decades, paleontologists and molecular biologists have disagreed about whether turtles are more closely related to birds and crocodiles or to lizards. Now scientists have developed a new technique using microRNAs for classifying animals, and the secret is out. Turtles are closer kin to lizards than crocodiles.

Variety of reptiles. Turtles are closer kin to lizards than crocodiles, new research has determined.
Credit: defun / Fotolia

Famous for their sluggishness, turtles have been slow to give up the secrets of their evolution and place on the evolutionary tree. For decades, paleontologists and molecular biologists have disagreed about whether turtles are more closely related to birds and crocodiles or to lizards. Now, two scientists from the Mount Desert Island Biological Laboratory in Bar Harbor, Maine, and their colleagues from Dartmouth College and Harvard and Yale Universities have developed a new technique using microRNAs for classifying animals, and the secret is out. Turtles are closer kin to lizards than crocodiles.

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To reach their conclusion, published in Biology Letters, the research team looked at a newly discovered class of molecules called microRNA. Most of the genetic material or DNA that scientists study provides the code for building proteins, large molecules that form an essential part of every organism. But microRNAs are much smaller molecules that can switch genes on and off and regulate protein production. They are also remarkably similar within related animal groups and provide important clues for identification.

"Different microRNAs develop fairly rapidly in different animal species over time, but once developed, they then remain virtually unchanged," said Kevin Peterson, a paleobiologist at MDIBL and Dartmouth College. "They provide a kind of molecular map that allows us to trace a species' evolution."

Peterson worked with Ben King, a bioinformatician at MDIBL. "My role in the study was to enhance our software so we could find new and unique microRNAs in the lizard genome," King said. "We identified 77 new microRNA families, and four of these turned out to also be expressed in the painted turtle. So we had the evidence we needed to say that turtles are a sister group to lizards and not crocodiles."

Though few creatures have been as puzzling as the turtle, the research team plans to use its microRNA analysis on other animals to help determine their origins and relationships as well. It is also developing a web-based platform to share the software with other researchers around the world.

In addition to King and Peterson, the research team included Tyler Lyson and Jacques Gauthier from Yale University, Eric Sperling from Harvard University, and Alysha Heimberg from Dartmouth College.


Story Source:

The above story is based on materials provided by Mount Desert Island Biological Laboratory. Note: Materials may be edited for content and length.


Journal Reference:

  1. T. R. Lyson, E. A. Sperling, A. M. Heimberg, J. A. Gauthier, B. L. King, K. J. Peterson. MicroRNAs support a turtle + lizard clade. Biology Letters, 2011; DOI: 10.1098/rsbl.2011.0477

Cite This Page:

Mount Desert Island Biological Laboratory. "Turtles next to lizards on family tree, discovery based on microRNAs shows." ScienceDaily. ScienceDaily, 26 July 2011. <www.sciencedaily.com/releases/2011/07/110725123711.htm>.
Mount Desert Island Biological Laboratory. (2011, July 26). Turtles next to lizards on family tree, discovery based on microRNAs shows. ScienceDaily. Retrieved November 25, 2014 from www.sciencedaily.com/releases/2011/07/110725123711.htm
Mount Desert Island Biological Laboratory. "Turtles next to lizards on family tree, discovery based on microRNAs shows." ScienceDaily. www.sciencedaily.com/releases/2011/07/110725123711.htm (accessed November 25, 2014).

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