Ajit Varki

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Ajit Varki is a physician-scientist who is distinguished professor of medicine and cellular and molecular medicine, co-director of the Glycobiology Research and Training Center[1] at the University of California, San Diego (UCSD), and co-director of the UCSD/Salk Center for Academic Research and Training in Anthropogeny (CARTA).[2] He is also executive editor of the textbook Essentials of Glycobiology[3] and Distinguished Visiting Professor at the Indian Institute of Technology, Madras. He is a specialist advisor to the Human Gene Nomenclature Committee.

Honors[edit]

Varki is an elected member of the American Academy of Arts and Sciences,[4] the Institute of Medicine,[5] the American Society for Clinical Investigation,[6] and the Association of American Physicians. He is recipient of a MERIT award from the NIH,[7] an American Cancer Society Faculty Research Award, and the two highest honors in the field of glycobiology, the Karl Meyer Award of the Society for Glycobiology (2005)[8] and the International Glycoconjugate Organization (IGO) Award (2007).[9] He was also elected to serve as president of the Society for Glycobiology (1996),[10] Editor-in-Chief of the Journal of Clinical Investigation (1992–97),[11] and president of the American Society for Clinical Investigation (1998–99).[12]

Research interests[edit]

The research group led by Varki has made many contributions over the last few decades[13] towards understanding the biological roles of the sugar chains or "glycans" found on all vertebrate cell surfaces and glycoproteins. In this field of Glycobiology, his present focus is on the Sialic Acids, which are found at the outermost position on such glycans, and which can be recognized by intrinsic receptors such as Selectins and the Siglecs (which he co-discovered and named as a sub-group of I-type Lectins), and also by the binding proteins of various pathogens. The group studies the significance of these interactions in biology, evolution and disease.[14] A particular focus is on multiple differences in sialic acid biology between humans and our closest evolutionary cousins, the great apes. These represent unusual events that occurred during human evolution and are relevant to understanding aspects of human uniqueness in health and disease.[15]

General interests[edit]

Varki has emphasized the key role of Physician-Scientists in the success of the US biomedical enterprise, and advocated for the support and preservation of this track at the national level.[16] He also played a key role in advocating for a chimpanzee genome project,[17] while emphasizing the need for ethical treatment of chimpanzees in research.[18] He continues to advocate for and facilitate interactions amongst scientists with interests in explaining the origin of the human species. In this regard, he coined the term "Phenome", in the context of recommending a "Great Ape Phenome Project".[19] While Editor-in-Chief of the Journal of Clinical Investigation, Varki made it the first major biomedical journal to be freely available on the web in 1996, presaging the general "Open Access" movement that came years later.[20] He also created the first viable model for a major "Open Access" textbook, the 2nd. Edition of the textbook Essentials of Glycobiology.[21] Varki is also very concerned about improving the support systems for women who pursue academic scientific careers, while also wishing to bear children. Varki and his wife Nissi enjoy entertaining, including a Christmas Carols celebration serving Tandoori goose.

Diet and disease[edit]

Varki's group has recently shown that a diet rich in red meat can result in accumulation of a non-human sialic acid molecule called Neu5Gc ("Gc") in the intestines and other tissues. This can allow type of dangerous E.coli toxin to affect the human body.[22] Also, humans develop antibodies against this foreign Gc molecule, increasing the risk of diseases like cancer.[23]

Education and biography[edit]

Varki went to the Bishop Cotton Boys' School, Bangalore, India during which time he was also strongly influenced by his maternal grandfather Pothan Joseph, a famous journalist and founding editor of many Indian newspapers, including Deccan Herald. He went on to receive basic training in physiology, medicine, biology, and biochemistry at the Christian Medical College, Vellore, continuing to maintain the first rank in his class throughout his schooling. He then did postgraduate training at the University of Nebraska and Washington University in St. Louis, USA, leading to board certification in internal medicine, hematology, and oncology. Following a postdoctoral fellowship with Stuart Kornfeld in St. Louis, he joined the faculty of UCSD in 1982. Significant past appointments include: associate dean for physician-scientist training,[24] co-head, Division of Hematology/Oncology, UCSD (1987–89), the interim directorship of the UCSD Cancer Center (1996–97), scientific advisor to the Complex Carbohydrate Research Center (University of Georgia), the Yerkes Primate Center (Emory University), member of the National Advisory Committee of PubMed Central (NLM/NIH), and coordinator for the multidisciplinary UCSD Project for Explaining the Origin of Humans.

Selected publications[edit]

Beyond his primary research accomplishments, Varki has written many widely cited and influential review articles, commentaries and letters on a variety of topics. Some examples are listed below. His publications have been cited over 30,000 times and he has an h-index of 87.[25]

  • Varki A, Holmes E, Yamada T, Agre P, Brenner S (April 2006). "Physician-scientists are needed now more than ever". Nature 440 (7085): 740. doi:10.1038/440740b. PMID 16598232. 
  • Varki A (September 2006). "Nothing in glycobiology makes sense, except in the light of evolution". Cell 126 (5): 841–5. doi:10.1016/j.cell.2006.08.022. PMID 16959563. 
  • Varki A, Angata T (January 2006). "Siglecs—the major subfamily of I-type lectins". Glycobiology 16 (1): 1R–27R. doi:10.1093/glycob/cwj008. PMID 16014749. 
  • Varki A (April 2007). "Glycan-based interactions involving vertebrate sialic-acid-recognizing proteins". Nature 446 (7139): 1023–9. doi:10.1038/nature05816. PMID 17460663. 
  • Crocker PR, Paulson JC, Varki A (April 2007). "Siglecs and their roles in the immune system". Nature Reviews Immunology 7 (4): 255–66. doi:10.1038/nri2056. PMID 17380156. 

See also[edit]

External links[edit]

References[edit]

  1. ^ "GRTC: About". United States: Glycobiology Research and Training Center. Archived from the original on February 13, 2012. Retrieved February 23, 2013. 
  2. ^ "Center for Academic Research Training in Anthropogeny (CARTA)". Carta.anthropogeny.org. Retrieved January 4, 2012. 
  3. ^ "Essentials of Glycobiology". Ncbi.nlm.nih.gov. October 3, 2011. Retrieved January 4, 2012. 
  4. ^ "Academy Elects 225th Class of Fellows and Foreign Honorary Members". Amacad.org. April 26, 2005. Retrieved January 4, 2012. 
  5. ^ "Institute of Medicine of the National Academies Directory – Ajit Varki". Iom.edu. Retrieved January 4, 2012. 
  6. ^ "The American Society for Clinical Investigation Membership List". The-asci.org. Retrieved January 4, 2012. 
  7. ^ "New Initiative to Study the Glycobiology of Cancer Could Aid Understanding of Cancer Risk and Detection". Cancer.gov. August 22, 2007. Retrieved January 4, 2012. 
  8. ^ "Karl Meyer Award Background and Past Winners". Glycobiology.org. Retrieved January 4, 2012. 
  9. ^ "''UCSD News''. March 8, 2007. By Debra Kain. "UCSD’s Ajit Varki to Receive Glycobiology’s Highest International Honor"". Ucsdnews.ucsd.edu. March 8, 2007. Retrieved January 4, 2012. 
  10. ^ "Society for Glycobiology: Committees: Past Presidents". Glycobiology.org. Retrieved January 4, 2012. 
  11. ^ "Historical Highlights: Blasts from the past". Journal of Clinical Investigation: 1017–1033. October 15, 2004. doi:10.1172/JCI23321. Retrieved January 4, 2012. 
  12. ^ "American Society for Clinical Investigation Council History". The-asci.org. Retrieved January 4, 2012. 
  13. ^ "San Diego Science Festival 2009 Nifty Fifty – Profile for Dr. Ajit Varki". Scholarnexus.com. May 23, 2007. Retrieved January 4, 2012. 
  14. ^ "Varki Lab Website". Cmm.ucsd.edu. Retrieved January 4, 2012. 
  15. ^ Bruce Lieberman. "Human evolution: Details of being human. By Bruce Lieberman. ''Nature News''. Published online 2 July 2008. Nature 454, 21–23 (2008).". Nature.com. doi:10.1038/454021a. Retrieved January 4, 2012. 
  16. ^ Emerging opportunities and career paths for the young physician-scientist. By Ajit Varki & Leon E. Rosenberg. Nature Medicine 8, 437 – 439 (2002) doi:10.1038/nm0502-437
  17. ^ Ajit Varki1 (August 1, 2000). "A Chimpanzee Genome Project Is a Biomedical Imperative. By Ajit Varki. ''Genome Res''. 2000. 10: 1065–1070.". Genome.cshlp.org. doi:10.1101/gr.10.8.1065. Retrieved January 4, 2012. 
  18. ^ The ethics of research on great apes. By Pascal Gagneux, James J. Moore & Ajit Varki. Nature 437, 27–29 (September 1, 2005). doi:[http://dx.doi.org/10.1038%2F437027a 10.1038/437027a; Published online August 31, 2005]
  19. ^ "Great Ape Phenome Project? By Varki A, Wills C, Perlmutter D, Woodruff D, Gage F, Moore J, Semendeferi K, Bernirschke K, Katzman R, Doolittle R, Bullock T. ''Science''. 1998 Oct 9;282(5387):239-40.". Sciencemag.org. October 9, 1998. doi:10.1126/science.282.5387.239d. Retrieved January 4, 2012. 
  20. ^ "Reflecting on 80 years of excellence. By Ushma Savla, Executive Editor. ''J Clin Invest''. 2004 October 15; 114(8): 1006–1016.". Ncbi.nlm.nih.gov. doi:10.1172/JCI200423290. Retrieved January 4, 2012. 
  21. ^ "Essentials of Glycobiology". Ncbi.nlm.nih.gov. October 3, 2011. Retrieved January 4, 2012. 
  22. ^ Kain, Debra (October 29, 2008). "Eating Red Meat Sets Up Target for Disease-Causing Bacteria". Ucsdnews.ucsd.edu. Retrieved January 4, 2012. 
  23. ^ Kain, Debra (November 13, 2008). "How Eating Red Meat Can Spur Cancer Progression". Ucsdnews.ucsd.edu. Retrieved January 4, 2012. 
  24. ^ "UCSD Office of the Associate Dean for Physician-Scientist Training". Meded.ucsd.edu. Retrieved January 4, 2012. 
  25. ^ "Jorge Hirsch's research and public service page". Physics.ucsd.edu. Retrieved January 4, 2012.