Tag Archives: 2016 report

Partners in Progress

Edwin Jones and Saied Mostaghimi

Edwin Jones, left, and Saied Mostaghimi

A message from the directors

Today’s world is changing rapidly.

We are facing pressures from a growing population, emerging health threats from new diseases, and challenges of keeping our drinking water safe.

But Virginia Cooperative Extension and the Virginia Agricultural Experiment Station — the two agencies that make up Agency 229 — have been working hard to help Virginia and its citizens overcome those challenges.

The stories in the pages that follow highlight the work we are undertaking in Virginia and around the world. Whether we are preparing students for new opportunities in the workforce, informing farmers of new food safety regulations, providing water testing and education to private water system owners, or helping producers increase their profits through value-added marketing, our mission is to improve the standard of living and quality of life for Virginians.

We encourage you to visit our websites — www.ext.vt.edu and www.vaes.vt.edu — to learn more about our research and programs that are making an impact in communities across Virginia.

Sincerely,

Edwin J. Jones
Associate Dean and Director, Virginia Cooperative Extension

Saied Mostaghimi
Associate Dean and Director, Virginia Agricultural Experiment Station

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Exploring genetics to combat malaria and Zika

Fralin Life Science Institute’s Vector-Borne Disease Research Group team members, from left: Zhijian “Jake” Tu, professor of biochemistry; Brantley Hall, biochemistry graduate student; Atashi Sharma, entomology graduate student; and Igor Sharakhov, associate professor of entomology

Fralin Life Science Institute’s Vector-Borne Disease Research Group team members, from left: Zhijian “Jake” Tu, professor of biochemistry; Brantley Hall, biochemistry graduate student; Atashi Sharma, entomology graduate student; and Igor Sharakhov, associate professor of entomology

The Zika virus has quickly become a major health threat, and researchers at Virginia Tech are looking for ways to curtail its spread.

The virus, which is primarily spread to humans by the bite of an infected mosquito, has been passed on to a growing number of Americans since early 2016, and the World Health Organization has declared it a Public Health Emergency of International Concern.

Biochemist Zhijian “Jake”  Tu is one of several Virginia Tech researchers zeroing in on the Zika virus. Tu is studying genes that turn biting female mosquitoes into males, and he is exploring genetic strategies to stop the transmission of the Zika virus by reducing the number of female mosquitoes. Male mosquitoes do not bite and are harmless to humans, while female mosquitoes bite humans to get the blood they need for egg production.

With support from an NIH grant and building on their previous discoveries that were published in the journal Science, Tu and some of his colleagues in the Vector-Borne Disease Research Group — Zach Adelman, Jinsong Zhu, and Maria Sharakhova — are investigating the molecular mechanisms and applications of male-determining factor in Aedes agypti mosquitoes, the species that transmits Zika.

Tu, Zhu, and Igor Sharakhov also received NIH funding to study sex determination in a family of malaria-spreading mosquitoes. Working with a large international consortium, the researchers sequenced the “Y” chromosome — the genetic drive of sex determination and male fertility — in Anopheles gambiae mosquitoes. The findings were published in the Proceedings of the National Academy of Sciences.

“Although the master switch genes that govern sex determination are completely different in Aedes and Anopheles mosquitoes, the approach that targets the female mosquitoes will have broad applications in efforts to control numerous mosquito-borne infectious diseases, including old foes such as malaria and emerging threats such as Zika,”  Tu said.

While Zika had only previously been associated with mild symptoms in humans, it can produce more severe symptoms in areas where the virus has recently been introduced because populations have no pre-existing immunity. It has also been linked to a birth defect called “microcephaly,” in which infected pregnant women give birth to brain-damaged babies with abnormally small heads.

About 10 Virginia Tech researchers with expertise in the fields of disease modeling, epidemic mapping, mosquito genetics, and novel insecticides are now focusing on Zika, developing ways to predict the spread of the virus and stop it from doing more damage.

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