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This year’s Bloch Lecture will be given by Denis Duboule, a pioneer in revealing the roles of Hox genes in development and evolution. Duboule earned his PhD in Biology in 1984 and is currently Professor of Developmental Genetics and Genomics at the École polytechnique fédérale de Lausanne (EPFL) and at the Department of Genetics and Evolution of the University of Geneva.
Duboule has made numerous contributions to our understanding of vertebrate development, genome organization and evolution. He discovered the spatial and temporal colinearity of mammalian Hox genes: the one-dimensional arrangement of Hox genes within Hox clusters determines their expression along spatial and temporal domains during development. He determined how long-range enhancers and chromatin domains regulate Hox gene expression, and he proposed how differences in Hox gene regulation contributed to the fin-to-limb transition. His genome engineering studies revealed the functions of Hox genes in body patterning and human genetic syndromes.
Duboule was elected as a Fellow of the Royal Society, a foreign member of the National Academy of Sciences, and Knight of the Legion of Honour. He is a recipient of the Louis-Jeantet Prize for Medicine.

By Jim Henle

Konrad E. Bloch was an outstanding scientist who helped shape the discipline of biochemistry in its formative years. One of the founders of biochemical studies at Harvard, he was part of the pioneer generation that included George Wald, Paul Doty, John Edsall and Frank Westheimer. Best known for his studies of cholesterol, he was awarded the Nobel Prize in Medicine or Physiology in 1964 (shared with Feodor Lynen) for investigations in the mechanism and regulation of cholesterol and fatty acid metabolism. Especially noteworthy were the studies on the biological synthesis of the molecule and, according to the Nobel Prize website, “on various aspects of terpene and sterol biogenesis…enzymatic formation of unsaturated fatty acids and…in various aspects of biochemical evolution.”

Arriving at Harvard from the University of Chicago in 1954, he was appointed Higgins Professor of Biochemistry, a position he held until his retirement in 1982. He was part of the core group at Harvard that founded the Committee on Higher Degrees in Biochemistry. With the somewhat later arrival of James Watson, Matthew Meselson, Walter Gilbert, Mark Ptashne and Guido Guidotti, Harvard had achieved a remarkably dynamic and productive core group in biochemistry and molecular biology, of which Dr. Bloch was a signal part. The late Dean Jeremy Knowles described him as “a marvelously perceptive biochemist and a wise, generous and cultivated man who forged the connections between chemistry and biochemistry. He was one of that distinguished line of European biochemists whose deep understanding of metabolism laid the chemical foundations of today’s biology.” [quoted in Harvard Gazette, Oct. 19, 2000]
Dr. Bloch was born in Neisse, then part of Germany, in 1912; he was racially excluded from his studies at Munich in 1934 upon the Nazi advent to power. His subsequent odyssey began in Switzerland, and he was spared a likely fatal return to Germany by the intervention of John Anderson, a Yale biochemist, who helped him with a visa to the US. In America, his studies resumed at Columbia; after a brief stay in Chicago, he came to Harvard.
His work was widely recognized; in addition to the Nobel, he received the US National Medal of Science, and many other awards and honorary degrees. In addition to his scientific output, he wrote intriguing popularizing works such as “Blondes in Venetian Paintings, the Nine-banded Armadillo, and Other Essays in Biochemistry”. He died in 2000, at the age of 88. In 1986, the annual Konrad Bloch lecture was inaugurated in his honor.The author wishes to express his gratitude to Prof. Guido Guidotti for reviewing the text for accuracy.
The Bloch lecture, sponsored by Pfizer, honors Harvard faculty member and Nobel-prize recipient Konrad Bloch (1912-2000), a pioneer in the field of cholesterol and lipid metabolism.