title: The Contributions - and Collapse - of Lamarckian Heredity in Pasteurian Molecular Biology: 1. Lysogeny, 1900-1960.
abstract: This article shows how Lamarckism was essential in the birth of the French school of molecular biology. We argue that the concept of inheritance of acquired characters positively shaped debates surrounding bacteriophagy and lysogeny in the Pasteurian tradition during the interwar period. During this period the typical Lamarckian account of heredity treated it as the continuation of protoplasmic physiology in daughter cells. Félix d'Hérelle applied this conception to argue that there was only one species of bacteriophage and Jules Bordet applied it to develop an account of bacteriophagy as a transmissible form of autolysis and to analyze the new phenomenon of lysogeny. In a long-standing controversy with Bordet, Eugène Wollman deployed a more morphological understanding of the inheritance of acquired characters, yielding a particulate, but still Lamarckian, account of lysogeny. We then turn to André Lwoff who, with several colleagues, completed Wollman's research program from 1949 to 1953. We examine how he gradually set aside the Lamarckian background, finally removing inheritance of acquired characters from the resulting account of bacteriophagy and lysogeny. In the conclusion, we emphasize the complex dual role of Lamarckism as it moved from an assumed explanatory framework to a challenge that the nascent molecular biology had to overcome.
authors.affiliation: Centre Cavaillès, USR 3608, ENS Paris, 29 rue d'Ulm, 75005, Paris, France. laurentloison@yahoo.fr.
authors.forename: Laurent
authors.initials: L
authors.lastname: Loison
authors.affiliation: IHPST, UMR 8590, Université Paris-1, 13 rue du four, 75006, Paris, France.
authors.forename: Jean
authors.initials: J
authors.lastname: Gayon
authors.affiliation: Virginia Polytechnic Institute and State University, Blacksburg, USA.
authors.forename: Richard M
authors.initials: RM
authors.lastname: Burian
mesh_terms: D001435:Bacteriophages / Q000502:physiology; D005602:France; D040941:Heredity; D049673:History, 20th Century; D008242:Lysogeny; D008967:Molecular Biology / Q000266:history*
keywords: André Lwoff; Bacteriophage; Eugène Wollman; Inheritance of acquired characters; Jules Bordet; Lamarckism; Lysogeny; Molecular biology; Pasteur Institute