Abstract
During the first decade of the twentieth century, the German bacteriologist Fred Neufeld, later Director of the Robert Koch-Institute in Berlin, first described the differentiation of pneumococci into serotypes on the basis of type-specific antisera. This finding was essential for subsequent research at the Rockefeller Institute of Medical Research (RIMR) in New York, and elsewhere, aiming for the conquest of human pneumococcal pneumonia, including antiserum therapy, the discovery that the type-specific antigens were carbohydrates, and the development of effective multivalent pneumococcal polysaccharide vaccines. Moreover, on the basis of pneumococcal serotypes Fred Griffith, in 1928 in London, discovered pneumococcal transformation, and Oswald T. Avery and coworkers, in 1944 at RIMR, identified DNA as the transforming substance. This sequence of events, leading to today’s knowledge that genes consist of DNA, was initiated by a farsighted move of Simon Flexner, first Director of the RIMR, who asked Neufeld to send his pneumococcal typing strains, thus setting the stage for pneumococcal research at RIMR. Here, we describe Fred Neufeld’s contributions in this development, which have remained largely unknown.
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Notes
The phrase “the sugarcoated microbe” has been envisaged by Avery as the title of a book he wanted to write but never did. It was adopted by McCarty as a chapter title [17].
Both authors of this article have been members of the scientific staff of the Rockefeller University, formerly named Rockefeller Institute for Medical Research (RIMR), New York: R.M.K. having spent a substantial part of his professional life there, K.E. several years as a junior scientist. Neither of the authors had the good fortune to know Avery while he was still an active investigator. R.M.K. met Avery in 1950 at a conference on streptococcal research at the Streptococcal Diseases Laboratory, Warren Air Force Base, Cheyenne, Wyoming. He reviewed his research on M protein isolation, a virulence factor of Group A streptococci, with both Avery and Rebecca Lancefield. Avery’s advice was: “Treat M protein more gently.” Avery retired from the RIMR and from active science in 1948. MacLeod left Rockefeller in 1941 to become professor of microbiology at New York University School of Medicine. McCarty remained at Rockefeller University for many years until his death in 2005. He was active during retirement in research, editing the Journal of Experimental Medicine, and many related activities. Both of the authors had the good fortune to work in close association with McCarty—Mac as he was known to all his associates—whose laboratory and office were next door to ours. He was our respected teacher and advisor in many aspects of science and everyday life. It is perhaps not surprising that, as a result, both of us developed a deep and lasting interest in the concepts and experiments that eventually led to the identification of DNA as the transforming principle. This discovery, published in 1944, became the basis of today’s knowledge that genes consist of DNA, and is perhaps the most consequential discovery in the biosciences of the twentieth century.
All quotations from documents in German translated by K. E.
Levinthal moved to England in 1933, and became professor of microbiology at Edinborough. His correspondence and papers were discarded after his death.
This aspect was analysed in depth by Mendelson [33]: The “microbe-hunters” among microbiologist followed Robert Koch who concluded from his successful handling of the cholera epidemic of Hamburg in 1892: “Had one in Hamburg not tracked the cholera into its remotest nook and cranny in so energetic a way and rendered innocious every discoverable trace of the infectious material, then it certainly would not have been possible, in my conviction, to master the fuel that was spread over the city in such a massive way”. In contrast, Neufeld attacked this attitude by calling upon his colleagues: “…to give up at last the notion that it is their duty to track down every last bacillus (or in typhus every last louse) into its remotest nook and cranny and to kill it” [32]. Neufeld thus held what became known as the “holistic view”, i.e. the coexistence of man and microbes in some form of equilibrium, with epidemics being mere disturbances of that equilibrium. See also reference [22].
M. G. Sevag described a method of deproteinizing solutions which was used by Avery et al. in the purification of the DNA fraction that had transforming activity (quoted in [11]). Neufeld was very supportive of Sevag, for example by approaching Flexner to consider one of Sevag’s papers for the Journal of Experimental Medicine.
This animal model was not further pursued. It was replaced by studies on a spontaneous pneumococcal epidemic of animal house guinea pigs, in line with Neufeld's philosophy that studying natural infections was more informative than artificial animal models [22].
Both reviews are transcripts of lectures given by Neufeld about a year before publication.
Griffith died in 1941 during an air raid on London. No correspondence between Griffith and Neufeld in the 1930s has been found.
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Acknowledgments
The authors are grateful for the assistance of Ms Heide Tröllmich, Archivist of the Robert Koch Institute for access by K. E. to the Fred Neufeld files containing extensive papers and correspondence, and for the assistance of Mr Charles Greifenstein, Archivist of the American Philosophical Society for access by R. M. K. to the Simon Flexner files. There is extensive correspondence in both archives between Simon Flexner and Fred Neufeld. We are grateful also to Prof. Hans-Hartmut Peter and to Sir Peter Lachmann for helpful suggestions and comments.
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Eichmann, K., Krause, R.M. Fred Neufeld and pneumococcal serotypes: foundations for the discovery of the transforming principle. Cell. Mol. Life Sci. 70, 2225–2236 (2013). https://doi.org/10.1007/s00018-013-1351-z
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DOI: https://doi.org/10.1007/s00018-013-1351-z