DNA Papers 14: Matthew Meselson, Franklin Stahl, and semiconservative replication of DNA

The penultimate episode of the DNA Papers podcast series revisits a paper that demonstrated the semiconservative mode of DNA replication, which had been predicted by complementary base-paired double helix model of the molecule discussed in episode 13 of this series: Meselson, Matthew, and Franklin W. Stahl. “The replication of DNA in Escherichia coli.” Proceedings of the National Academy of Sciences 44, no. 7 (July 15, 1958): 671–82. https://doi.org/10.1073/pnas.44.7.671 The papers offers the details an experiment designed and performed by a pair of young molecular biologists, Matthew Meselson and Franklin Stahl at Caltech. They deployed the newly developed technique of density gradient centrifugation in combination with the use of heavy isotopes of nitrogen to show that during the replication of a DNA molecule, each progeny helix contained one strand that was conserved, or passed down directly from the parent and one new strand synthesized from the conserved template. Listen to our expert guests from different disciplines as they share their insights into what has been described as “the most beautiful experiment in biology”: Allan Franklin University of Colorado Boulder Michel Morange IHPST, Université Paris I William C. Summers Yale University Janina Wellmann Max Planck Institute for the History of Science Recorded on March 27, 2024 For additional resources on this topic, please see https://www.chstm.org/video/144