F INDINGS National Institutes of Health National Institute of General Medical Sciences Science Without Borders Geneticist Dyann Wirth: Understanding the.

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F INDINGS National Institutes of Health National Institute of General Medical Sciences Science Without Borders Geneticist Dyann Wirth: Understanding the DNA of Parasites

F INDINGS National Institutes of Health National Institute of General Medical Sciences Dyann Wirth Probes Parasites Geneticist Wirth wants to wipe out malaria by overcoming a parasite’s drug resistance. Plasmodia Are parasitic protozoans Cause malaria Infect humans and mosquitoes Question: How do Plasmodia survive antimalarial medicines?

F INDINGS National Institutes of Health National Institute of General Medical Sciences Answer: Genetic adaptation DNA: altered over time by adaptation to many events Encounters with body chemistry of mosquito Run-ins with anti-malarial medicines Interactions with human immune system Adaptation DNA Altered DNA passed on to offspring

F INDINGS National Institutes of Health National Institute of General Medical Sciences Deadly Differences Most widespread and dangerous Accounts for 80% of human malarial infections and 90% of deaths Four species of Plasmodium parasite cause malaria in humans Plasmodium falciparum How can scientists pinpoint what makes Plasmodium falciparum so deadly?

F INDINGS National Institutes of Health National Institute of General Medical Sciences Exploring Parasite Secrets Scientists study genetic variation: Across populations Single-nucleotide polymorphism (SNP) Patterns of SNPs Why do scientists study more than one genome? What is the name for these DNA patterns? Give an example of a SNP.

F INDINGS National Institutes of Health National Institute of General Medical Sciences Global Team Science Exploration begins with patient volunteers from malaria clinics on 3 continents

F INDINGS National Institutes of Health National Institute of General Medical Sciences Plasmodia Parasites in Human Blood Malaria parasite Plasmodium falciparum growing inside human red blood cells South America Asia Africa

F INDINGS National Institutes of Health National Institute of General Medical Sciences Wirth’s Experiments Wirth’s method identifies Differences and commonalities Genetic adaptation across populations Promising targets for intervention Analyze using computer with specialized software Recurring SNPs are promising targets for vaccines and new drugs Extract DNA sequences of parasite from blood of volunteers Identify recurring SNPs

F INDINGS National Institutes of Health National Institute of General Medical Sciences The Human Touch Human activity can spread drug resistance How do humans help mosquitoes spread resistance across extremely wide geographic areas? What human-made environments make great breeding sites for mosquito larvae?

F INDINGS National Institutes of Health National Institute of General Medical Sciences The MIDAS Touch Model of Infectious Disease Agent Study Brings together international network of scientists from different fields Simulates infectious disease outbreaks Identifies most effective interventions Prepares public health experts to control infectious disease disasters before they happen

F INDINGS National Institutes of Health National Institute of General Medical Sciences Research Applications How might knowledge that Wirth and her team have gained about Plasmodium DNA be used to develop an early warning system for malaria drug resistance?