Arkansas researchers to track CWD using genetic information

Study will identify how groups of deer are related to one another throughout Arkansas and determine which populations are less susceptible to CWD.

May 3, 2018

2 Min Read
Arkansas researchers to track CWD using genetic information

University of Arkansas researchers Marlis and Michael Douglas are using genetic information to implement the first statewide study of chronic wasting disease (CWD) among white-tailed deer in Arkansas.

Funded by a $200,000 grant from the Arkansas Game & Fish Commission, the study will identify how groups of deer are related to one another throughout the state and determine which populations are less susceptible to the disease.

CWD is an incurable, fatal, transmittable disease found in deer, elk and moose. It is caused by a deformed protein called a prion, similar to bovine spongiform encephalopathy in cattle and scrapie in sheep. Currently, there is no evidence that CWD is a threat to humans or livestock.

The disease was originally identified in Colorado in 1967 and was confirmed in an Arkansas deer for the first time in 2016, the university said. The most recent statistics from Arkansas show that as of January 2018, there were 357 cases in deer and elk in 10 northern Arkansas counties, with the bulk of the infections occurring in Newton County.

The Douglases are leading the CWD study. Both are professors in the department of biological sciences; Marlis holds the Bruker professorship in life sciences, and Michael holds the 21st Century chair in global change biology. They and their graduate students, Tyler Chafin and Zach Zbinden, will perform DNA testing on 10 deer sampled per county in Arkansas, plus an additional 300 samples from the Arkansas Game & Fish Commission’s CWD Management Zone -- a cluster of counties in the northern part of the state centered on Newton County. The tissue samples will be collected from deer harvested by hunters or killed in roadside accidents.

By determining how deer populations are related throughout the state, the researchers will acquire a clearer understanding of their movement patterns, the announcement said.

“Understanding how deer disperse will give us an understanding of how the disease is spreading,” Marlis Douglas said, adding that this information will help the Game & Fish Commission "develop management strategies that either facilitate movements among deer groups or prevent them, depending on the circumstances.”

While groups of deer often interbreed, geographic barriers such as rivers, interstate highways or elevation changes can keep deer herds from mixing, she said. “This shows up in our genetic testing as populations being distinct from one another.”

Similar studies in other states have already shown that some deer populations carry a gene variant that may make them less susceptible to CWD, the university said, noting that a previous study by Marlis and Michael Douglas showed that the variant is present in some Arkansas deer.

Natural resource managers will have powerful tools to help contain the disease when researchers have a clear understanding of how deer populations intermix and an idea which deer carry the gene variant.

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