Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:


Human evolution at the crossroads: Integrating genetics and paleontology


Advances in genetics during the last decade not only have influenced modern medicine, they also have changed how human evolution is studied, says an anthropologist from the University of Illinois at Urbana-Champaign.

Using her own research on the teeth of baboons as a case in point, Leslea J. Hlusko said that some of the traits considered important to human evolution, such as the thickness of molar enamel, may be too simplistically interpreted by some paleontologists.

Hlusko organized a Monday symposium on human evolution at the annual meeting of the American Association for the Advancement of Science. She brought together experts who study phylogenetics, ancient DNA, developmental genetics, quantitative genetics and primate evolution so that they could share the same stage to discuss their current work, and where they may be able to go on together in an effort to understand the evolution of our ancestors. The session was discussed Sunday at a news briefing.

Hlusko’s call for an integration of paleontology and genetics is also the focus of a perspective article that will appear online Monday ahead of print publication by the Proceedings of the National Academy of Sciences.

"Data from developmental genetics and biomedicine, coupled with advances in computer technology, now provide us with a wealth of new information from which to better understand the genetic and non-genetic influences underlying primate, including human, evolution," Hlusko said in an interview. "By combining these different data sets with the fossil record, we don’t have to be just paleontologists, or just geneticists. Because selection operates on the genome through our anatomies, it makes better sense to conduct our research with a similarly integrative approach. Recent advances in genetics have now made this method more feasible for primate studies."

Research on early hominids, she argues, has benefited from an abundance of new fossil finds, but the emerging data are leading to competing interpretations of human origins and evolution instead of providing clarity. Research that integrates paleontology and genetics may provide some resolution to these debates, she said.

As an example, her recent study of teeth in more than 400 savanna baboons housed at the Southwest Foundation in San Antonio shows that, contrary to long-held assumptions, enamel thickness varies widely within a population. She and her colleagues also found that the underlying genetic architecture may have enabled rapid evolutionary changes in enamel thicknesses that could reflect changes in dietary habits over time.

The study, published online ahead of print by the American Journal of Physical Anthropology, is the largest genetic analysis of primate enamel thickness done so far.

"People have assumed that it is hard to change certain traits -- that if an organism has evolved thick enamel, its descendents cannot easily go back to thin enamel," she said. "The thinking has been that if hominid fossils 5 million years old have thick enamel, they are human ancestors. If they have thinner enamel, they must be chimpanzees."

That assumption, Hlusko said, "may be over simplified." Using their baboon study, Hlusko and colleagues argue that "when used uncritically, enamel thickness has the potential to confound rather than to clarify phylogenetic studies of higher primates."

The Monday morning AAAS session reflects a desire to "see integrative paleontological and genetic approaches as the norm rather than the exception in primate and human evolutionary studies," Hlusko said at a news briefing on Sunday. This integrative approach was first developed by scientists working outside the study of primates, such as Rudolf Raff of Indiana University, also a participant in the AAAS symposium. One of the goals for the symposium and Hlusko’s PNAS article is to highlight the application of integrative biology to human evolutionary studies.

"Although many of the scientists currently involved in this integrative approach are united by their common interest in human evolution, I’ve realized over the last few years that many of us sometimes seem to speak different languages," she said.

"We often think about genetics and evolution from very different perspectives," Hlusko continued. "These conceptual divides lead to a bit of isolation and separation, and are actually holding back progress in both research and training. This symposium will give us an opportunity to come together and talk across our differences."

The true advancement in the understanding of human evolution will come primarily from two sources, Hlusko said: recovery of new fossils (fieldwork); and the integration between genetics, development and paleontology.

Speakers in the symposium who discussed their current research, in addition to Hlusko, a paleontologist incorporating quantitative genetic approaches, were Alan Walker of Pennsylvania State University, a primate paleontologist who discussed efforts to understand contradictory paleontological and genetic phylogenies; Chi-hua Chiu of Rutgers University, who gave a developmental genetics perspective on human evolution; and Hendrik Poinar of McMaster University in Canada, who studies the molecular components extracted from ancient fossils (ancient DNA).

Speaking in more general terms about the current state of integrated hominid paleontological/genetics research and where it may be headed were Kenneth M. Weiss of Pennsylvania State University, a developmental geneticist, and Raff, the author of the 1996 book "The Shape of Life: Genes, Development and the Evolution of Animal Form" and founder of "EvoDevo" (evolutionary-developmental biology).

Jim Barlow | EurekAlert!
Further information:

More articles from Life Sciences:

nachricht Don't Give the Slightest Chance to Toxic Elements in Medicinal Products
23.03.2018 | Physikalisch-Technische Bundesanstalt (PTB)

nachricht North and South Cooperation to Combat Tuberculosis
22.03.2018 | Universität Zürich

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Space observation with radar to secure Germany's space infrastructure

Satellites in near-Earth orbit are at risk due to the steady increase in space debris. But their mission in the areas of telecommunications, navigation or weather forecasts is essential for society. Fraunhofer FHR therefore develops radar-based systems which allow the detection, tracking and cataloging of even the smallest particles of debris. Satellite operators who have access to our data are in a better position to plan evasive maneuvers and prevent destructive collisions. From April, 25-29 2018, Fraunhofer FHR and its partners will exhibit the complementary radar systems TIRA and GESTRA as well as the latest radar techniques for space observation across three stands at the ILA Berlin.

The "traffic situation" in space is very tense: the Earth is currently being orbited not only by countless satellites but also by a large volume of space...

Im Focus: Researchers Discover New Anti-Cancer Protein

An international team of researchers has discovered a new anti-cancer protein. The protein, called LHPP, prevents the uncontrolled proliferation of cancer cells in the liver. The researchers led by Prof. Michael N. Hall from the Biozentrum, University of Basel, report in “Nature” that LHPP can also serve as a biomarker for the diagnosis and prognosis of liver cancer.

The incidence of liver cancer, also known as hepatocellular carcinoma, is steadily increasing. In the last twenty years, the number of cases has almost doubled...

Im Focus: Researchers at Fraunhofer monitor re-entry of Chinese space station Tiangong-1

In just a few weeks from now, the Chinese space station Tiangong-1 will re-enter the Earth's atmosphere where it will to a large extent burn up. It is possible that some debris will reach the Earth's surface. Tiangong-1 is orbiting the Earth uncontrolled at a speed of approx. 29,000 km/h.Currently the prognosis relating to the time of impact currently lies within a window of several days. The scientists at Fraunhofer FHR have already been monitoring Tiangong-1 for a number of weeks with their TIRA system, one of the most powerful space observation radars in the world, with a view to supporting the German Space Situational Awareness Center and the ESA with their re-entry forecasts.

Following the loss of radio contact with Tiangong-1 in 2016 and due to the low orbital height, it is now inevitable that the Chinese space station will...

Im Focus: Alliance „OLED Licht Forum“ – Key partner for OLED lighting solutions

Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP, provider of research and development services for OLED lighting solutions, announces the founding of the “OLED Licht Forum” and presents latest OLED design and lighting solutions during light+building, from March 18th – 23rd, 2018 in Frankfurt a.M./Germany, at booth no. F91 in Hall 4.0.

They are united in their passion for OLED (organic light emitting diodes) lighting with all of its unique facets and application possibilities. Thus experts in...

Im Focus: Mars' oceans formed early, possibly aided by massive volcanic eruptions

Oceans formed before Tharsis and evolved together, shaping climate history of Mars

A new scenario seeking to explain how Mars' putative oceans came and went over the last 4 billion years implies that the oceans formed several hundred million...

All Focus news of the innovation-report >>>



Industry & Economy
Event News

New solar solutions for sustainable buildings and cities

23.03.2018 | Event News

Virtual reality conference comes to Reutlingen

19.03.2018 | Event News

Ultrafast Wireless and Chip Design at the DATE Conference in Dresden

16.03.2018 | Event News

Latest News

For graphite pellets, just add elbow grease

23.03.2018 | Materials Sciences

Unique communication strategy discovered in stem cell pathway controlling plant growth

23.03.2018 | Agricultural and Forestry Science

Sharpening the X-ray view of the nanocosm

23.03.2018 | Physics and Astronomy

Science & Research
Overview of more VideoLinks >>>