Super-resolution imaging of chromosomal DNA in time and space
Prof. Ting Wu | Department of Genetics, Harvard Medical School, USA

The nearly two meters of DNA must be folded to fit into a ten micrometer large nucleus of a mammalian cell and still remain accessible for the complex molecular machineries of gene transcription, DNA replication and DNA repair. Exploring three-dimensional chromatin structure is therefore pivotal to understand the mechanisms governing genome organisation. Fluorescence microscopy has in recent years advanced into super-resolution imaging where improved resolution bridge the gap between electron microscopy and light microscopy. At this resolution a detailed exploration of structures within a cell can be made.
Prof. Wu has pioneered the technology for imaging of chromatin by developing oligonucleotide paints for Fluorescent in situ hybridisation (FISH) which allows for super-resolution studies of specific gene loci as small as tens of kilobases. She has recently further developed dual-Oligopaints to visualize 3D folding and organisation of individual chromosomes. Prof. Wu has long been interested in ultra conserved elements (UCE) between distantly related mammals. She has proposed a model where UCEs are important for genome integrity and her team have shown a relationship between UCEs and copy number variants in diseases such as cancer. She is also part of the Consortium for Space Genetics where she addresses the impact of ionizing radiation on DNA damage and chromatin structure.
Prof. Ting Wu had her training at Harvard Medical School in genetics. Wu started her independent career as assistant professor at Harvard Medical School in 1993 and became a full professor 2007. Ting Wu is a pioneer in biomedical research receiving the prestigious National Institutes of Health Director’s Pioneer Award in 2012 and she has also several awards for teaching.
Selected references
  • Beliveau BJ, Joyce ER, Apostolopoulos N, Yilmaz F, Fonseka CY, McCole RB, Chang Y, Li JB, Senaratne TN, Williams BR, Rouillard J-M, Wu, C-t. A versatile design and synthesis platform for visualizing genomes with Oligopaint FISH probes. Proc. Nat. Acad. Sci. USA 2012 109:21301-6.
  • Wang S, Su J-H, Beliveau BJ, Bintu B, Moffitt JR, Wu C-t, Zhuang X. Spatial organization of chromatin domains and compartments in single chromosomes. Science 2016 353:598-602. doi: 10.1126/science.aaf8084. Epub 2016 Jul 21.
  • Joyce EF, Erceg J, Wu CT. Pairing and anti-pairing: a balancing act in the diploid genome. Curr Opin Genet Dev. 2016 Apr 8;37:119-128. doi: 10.1016/j.gde.2016.03.002
  • Boettiger AN, Bintu B, Moffitt JR, Wang S, Beliveau BJ, Fudenberg G, Imakaev M, Mirny LA, Wu C-t, Zhuang X. Super-resolution imaging reveals distinct chromatin folding for different epigenetic states. Nature. 2016 529:418-22. doi: 10.1038/nature16496.
  • McCole RB, Fonseka CY, Koren A, Wu CT. Abnormal dosage of ultraconserved elements is highly disfavored in healthy cells but not cancer cells. PLoS Genet. 2014 Oct 23;10(10):e1004646. doi: 10.1371/journal.pgen.1004646