Van Leeuwenhoek Lecture on BioScience: DNA Sequencing Technology
- 31 May 2018
- Gorlaeus Building
2333 CC Leiden
- LUMY 04.28
Van Leeuwenhoek Lecture
May's Van Leeuwenhoek Lecture on BioScience will be held by Dr. Jim Mullikin, director of the NIH Intramural Sequencing Center (NISC).
DNA Sequencing Technology Advancements and Its Applications to Better Understand the World Around Us
The light bulb is often used as a symbol for someone with a bright idea. In the book “Fifty Inventions That Shaped the Modern Economy”, Tim Harford compared the ancient times when wood fires were the only means of human-produced light to today’s modern LED light bulb and calculated this to be a 500,000-fold cost reduction in light production over the last few thousand years. Contrasting this to our early ability to determine the nucleic acid sequence of the DNA molecule since the days of Fred Sanger and his dideoxy chain-termination invention for DNA sequencing in 1977 to today’s sequencing-by-synthesis methods offers an incredible 400,000,000-fold cost reduction over a much shorter timeframe. Thus, there were a lot of bright ideas over the last 45 years making this tremendous advancement possible.
In this presentation I will cover some of the major advancements in DNA sequencing technologies and highlight two examples where DNA sequencing has acted like the microscope of van Leeuwenhoek’s day, letting us see and understand things we could not see before. The first of these examples is the application of DNA sequencing of samples extracted from ancient hominid bones and how this shed light on equally ancient admixtures of Neandertals and humans 50,000-80,000 years ago. DNA sequencing also led to the discovery of an entirely new hominid lineage by sequencing a sample which was thought to be a pinky of a Neandertal or human, but is now called an entirely new archaic human lineage named after the Denisova cave in Siberia where the tiny bone was found. The second example is how DNA sequencing helped resolve the epidemiological history of an antibiotic resistant bacteria outbreak in a hospital setting. Not only were we able to track the bacteria from the few mutations acquired over the course of the outbreak from samples acquired across both patients and hospital systems (respirator, sink drains, etc), but in a follow-up investigation we were able to follow the plasmids inferring antibiotic resistance across the bacterial isolates, identifying plasmid exchange from one bacterial isolate to another.
Jim Mullikin, Ph.D., is the director of the NIH Intramural Sequencing Center (NISC) and an associate investigator in the National Human Genome Research Institute’s Cancer Genetics and Comparative Genomics Branch. Dr. Mullikin develops and utilizes computer programs to analyze large data sets generated by systematic DNA sequencing projects. A computational genomicist, he collaborates extensively with biomedical researchers, analyzing data produced at NISC, by others or are available in public databases. Dr. Mullikin's group is currently developing new methods to better interpret the huge volumes of data produced by next-generation DNA sequencers. Dr. Mullikin holds a Ph.D. in physics (image and signal processing) from Delft University of Technology, the Netherlands.