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Abstract
Leprosy is a chronic human disease caused by the yet-uncultured pathogen Mycobacterium leprae. Although readily curable with multidrug therapy (MDT), over 200,000 new cases are still reported annually. Here, we obtain M. leprae genome sequences from DNA extracted directly from patients’ skin biopsies using a customized protocol. Comparative and phylogenetic analysis of 154 genomes from 25 countries provides insight into evolution and antimicrobial resistance, uncovering lineages and phylogeographic trends, with the most ancestral strains linked to the Far East. In addition to known MDT-resistance mutations, we detect other mutations associated with antibiotic resistance, and retrace a potential stepwise emergence of extensive drug resistance in the pre-MDT era. Some of the previously undescribed mutations occur in genes that are apparently subject to positive selection, and two of these (ribD, fadD9) are restricted to drug-resistant strains. Finally, nonsense mutations in the nth excision repair gene are associated with greater sequence diversity and drug resistance.
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1 Global Health Institute, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
2 Global Health Institute, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; Department of Microbiology and Biotechnology Centre, Maharaja Sayajirao University of Baroda, Vadodara, India
3 Global Health Institute, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland; Swiss Tropical and Public Health Institute, Basel, Switzerland
4 Armauer Hansen Research Institute, Addis Ababa, Ethiopia
5 Laboratory of Molecular Biology Applied to Mycobacteria, Oswaldo Cruz Institute, Rio de Janeiro, Brazil
6 Leprosy Research Center, National Institute of Infectious Diseases, Tokyo, Japan
7 AUEN Polyclinic, Tokorozawa, Saitama Prefecture, Japan
8 Laboratório de Dermato-Imunologia, Instituto de Ciências Biológicas, Universidade Federal do Pará, Marituba, Pará, Brazil
9 Dermatology Division, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
10 Spatial Epidemiology Laboratory, Federal University of Pará, Castanhal, Pará, Brazil
11 Leprosy Laboratory, Oswaldo Cruz Institute, Rio de Janeiro, Brazil
12 Tropical Pathology and Public Health Institute, Federal University of Goiás, Goiânia, Brazil
13 Ministry of Health and Population, c/o National Leprosy Elimination Programme, Taiz, Yemen
14 Division of Infectious Diseases and Tropical Medicine, University Hospital, Ludwig-Maximilians-University, Munich, Germany
15 Laboratorio Interdisciplinario de Investigación Dermatológica, Servicio de Dermatología, Hospital Universitario, Universidad Autónoma de Nuevo León, Monterrey, Mexico
16 Programme National Lèpre de Guinée, Conakry, Guinea
17 Centre Interfacultaire de Formation et de Recherche en Environnement pour le Développement Durable, University of Abomey-Calavi, Jericho, Cotonou, Benin
18 Centre National d’Appui à la Lutte Contre la Maladie, Bamako, Mali
19 Programme National de Lutte contre la Lèpre, Ministry of Public Health, Niamey, Niger
20 Tropical Medicine Centre, University of Brasília, Brasília, Brazil
21 Laboratory of Molecular Biology Applied to Mycobacteria, Oswaldo Cruz Institute, Rio de Janeiro, Brazil; Department of Biomedical Sciences, Mycobacteriology Unit, Tropical Institute of Medicine, Antwerp, Belgium
22 Lauro Souza Lima Institute, Bauru, São Paulo, Brazil
23 Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO, USA