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Roger Tsien


Roger Tsien

Roger Y. Tsien
Born (1952-02-01) February 1, 1952 (age 62)
New York City, United States
Residence San Diego
Citizenship United States
Nationality American
Fields Biochemistry
Institutions UC San Diego
UC Berkeley
Alma mater Harvard University
University of Cambridge
Known for GFP
Calcium imaging
Notable awards Nobel Prize in Chemistry (2008)
E. B. Wilson Medal (2008)
Rosenstiel Award (2006)
Wolf Prize in Medicine (2004)
Keio Medical Science Prize (2004)
Dr A.H. Heineken Prize (2002)
Artois-Baillet Latour Health Prize (1995)
Gairdner Foundation International Award (1995)

Roger Yonchien Tsien (born February 1, 1952) is a Chinese American biochemist. He is a professor at the Department of Chemistry and Biochemistry, University of California, San Diego.[1] He was awarded the 2008 Nobel Prize in chemistry "for his discovery and development of the green fluorescent protein (GFP) with two other chemists: Martin Chalfie of Columbia University and Osamu Shimomura of Boston University and Marine Biological Laboratory.[2]

Personal life

According to the Qian (Tsien) clan genealogy book, Tsien is a 34th-generational descendant of King Qian Liu of the Wuyue Kingdom of ancient China.[3]

Tsien has a number of accomplished engineers in his extended family, including his father Hsue-Chu Tsien who was a mechanical engineer and his mother's brothers who were engineering professors at MIT. Both of Tsien's parents came from Zhejiang Province, China. The famous rocket scientist Tsien Hsue-shen, regarded as the co-founding father of JPL of Caltech and later the director of the Chinese ballistic-missile and space programs, is a cousin of Tsien's father.[4] Tsien's brother Richard Tsien is also a renowned scientist currently at New York University. Tsien, who calls his own work molecular engineering, once said, "I'm doomed by heredity to do this kind of work."[5]

Tsien was born in New York, in 1952.[6] He grew up in Livingston, New Jersey[6] and attended Livingston High School there.[7]

Tsien suffered from asthma as a child, and as a result, he was often indoors. He spent hours conducting chemistry experiments in his basement laboratory. When he was 16, he won first prize in the nationwide Westinghouse talent search with a project investigating how metals bind to thiocyanate.[6]

He attended Harvard University on a National Merit Scholarship, where he was elected to Phi Beta Kappa as a junior.[8] He graduated summa cum laude with a Bachelor of Science in chemistry and physics in 1972. According to his freshman-year roommate, economist and Iowa politician Herman Quirmbach, “It’s probably not an exaggeration to say he’s the smartest person I ever met... [a]nd I have met a lot of brilliant people.”[9]

After completing his bachelor's degree, he joined the Physiological Laboratory at the University of Cambridge in Cambridge, England with the aid of a Marshall Scholarship.[10] He received his PhD in physiology from Churchill College, University of Cambridge in 1977, with the doctoral dissertation The Design and Use of Organic Chemical Tools in Cellular Physiology (1976) supervised by Prof. Jeremy Sanders.[10]

Tsien was a Research Fellow at Gonville and Caius College, University of Cambridge from 1977 to 1981.[10] He was appointed to the faculty at the University of California, Berkeley, from 1982 to 1989. Since 1989 he has been working at the University of California, San Diego, as Professor of Pharmacology and Professor of Chemistry and Biochemistry,[1] and an investigator of the Howard Hughes Medical Institute.[11][12]


Tsien is renowned for revolutionizing the fields of cell biology and neurobiology by allowing scientists to peer inside living cells and watch the behavior of molecules in real time.

In 2004, Tsien was awarded the Wolf Prize in Medicine "for his seminal contribution to the design and biological application of novel fluorescent and photolabile molecules to analyze and perturb cell signal transduction."[13]

In 2008, Tsien shared the Nobel Prize in Chemistry with Osamu Shimomura and Martin Chalfie for "the green fluorescent protein: discovery, expression and development."[2] [14]

Development of GFPs and other fluorescent proteins

The multicolored fluorescent proteins developed in Tsien's lab are used by scientists to track where and when certain genes are expressed in cells or in whole organisms. Typically, the gene coding for a protein of interest is fused with the gene for a fluorescent protein, which causes the protein of interest to glow inside the cell and allows microscopists to track its location in real time. This is such a popular technique that it has added a new dimension to the fields of molecular biology, cell biology, and biochemistry.[15]

Since the discovery of the wild type GFP, numerous different mutants of GFP have been engineered and tested.[16] The first significant leap forward was a single point mutation (S65T) reported by Tsien in 1995 in Nature.[17] This mutation dramatically improved the fluorescent (both intensity and photostability) and spectral characteristics of GFP. A shift of the major excitation peak to 488 nm with the emission peak staying at 509 nm thus can be clearly observed, which matched very well the spectral characteristics of commonly available FITC facilities. All these then largely amplified the practicality of using GFP by scientists in their research. Tsien mainly contributed to much of our understanding of how GFP works and for developing new techniques and mutants of GFP.

Former trainees include Atsushi Miyawaki and Alice Y. Ting.

Timelines of GFP-development involved by Tsien:[14]

  • 1994: Tsien showed the mechanism that GFP chromophore is formed in a chemical reaction which requires oxygen but without help from the other proteins.
  • 1994–1998: Tsien and collaborators made various GFP mutants by genetic modification and structural tweaking. Newly created variants of GFP can shine more brightly and show different colours, such as yellow, cyan, and blue.
  • 2000–2002: Tsien produced stable variants of DsRED, which can glow in shades of red, pink, and orange. Remarkably, since then complicated marcromolecular networks of living organisms can be labelled or marked by using "all the colours of the rainbow".

Other detailed highlights involved by Tsien:[18]

  • 2002: The critical structural difference between GFP and DsRed was revealed. One extra double-bond in the chromophore of DsRed extends its conjugation thus causes the red-shift.
  • 2002: Monomeric DsRed (mRFP) was first developed.
  • 2004: New "fruit" FPs were generated (by in vitro and in vivo directed evolutions).

In 2009, a new kind of IFP was developed by Tsien's group, and further reported and described by Science. The new IFPs are developed from bacterial phytochromes instead of from multicellular organism like jellyfish. Under normal conditions, bacterial phytochromes absorb light for signaling instead of fluorescence, but they can be turned fluorescent after deleting some of the signaling parts by genetic means such as site-directed mutagenesis. In order to fluorescence, tetrapyrrole is also required, however, it's abundant in living bodies.[19]

Calcium imaging

Tsien is a key pioneer of calcium imaging and well known for developing various dyes which change color in the presence of particular ions such as calcium. One such dye, Fura-2, is widely used to track the movement of calcium within cells. Indo-1, another popular calcium indicator, was also developed by Tsien's group in 1985.

Aequorin is also a useful tool to indicate calcium level inside cells; however, it has some limitations, primarily is that its prosthetic group coelenterazine is consumed irreversibly when emits light, thus requires continuous addition of coelenterazine into the media. To overcome such issues, Tsien's group also developed the calmodulin-based sensor, named Cameleon.[20]


FlAsH-EDT2 is a biochemical method for specific covalent labeling inside live cells. It's a method based on recombinant protein molecules, and was developed by Tsien and his colleagues in 1998.[21]

  • "FLASH-EDT2": Fluorescein arsenical helix binder, bis-EDT adduct,
  • "EDT": 1,2-ethanedithiol.

Fluorescence-assisted cancer surgery

According to experimental (in mouse) results from Tsien's group, cancer surgery can be guided and assisted by fluorescent peptides. The peptides are used as probes, and are harmless to living tissues and organs. Their lifetime in the body is only 4 or 5 days. The human testing is hoped to be ready within two or three years.[22]

Industrial and educational activities

Tsien is also a notable biochemical inventor and holds or co-holds about 100 patents till 2010. In 1996, Tsien co-founded the Aurora Biosciences Corporation, which started its public commerce in 1997. In 2001, Aurora was acquired by the Vertex Pharmaceuticals. Similarly, Tsien was also a scientific co-founder of Senomyx in 1999.[6]

Dr. Tsien also helps promote science education to promising young scientists through the first-ever

Awards and honors

Roger Y. Tsien has received numerous honors and awards in his life, including:

Named lectureship

See also


Related readings

External links

  • Nobel Prize in Chemistry, 2008
  • Tsien lab Website
  • Dr H.P. Heineken Prize for Biochemistry and Biophysics 2002
  • Tsien Nobel Prize lecture
  • The Wolf Prize in Medicine in 2004 (detail)
  • Research done by Roger Y. Tsien
  • The Chemistry of Fluorescent Indicators: the Work of Roger Y. Tsien

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