Phylogeography of Borrelia burgdorferi in the eastern United States reflects multiple independent Lyme disease emergence events.
Since its first description in coastal Connecticut in 1976, both the incidence of Lyme disease and the geographic extent of endemic areas in the US have increased dramatically. The rapid expansion of Lyme disease into its current distribution in the eastern half of the US has been due to the range expansion of the tick vector, Ixodes scapularis, upon which the causative agent, Borrelia burgdorferi is dependent for transmission to humans. In this study, we examined the phylogeographic population structure of B. burgdorferi throughout the range of I. scapularis-borne Lyme disease using multilocus sequence typing based on bacterial housekeeping genes. We show that B. burgdorferi populations from the Northeast and Midwest are genetically distinct, but phylogenetically related. Our findings provide strong evidence of prehistoric population size expansion and east-to-west radiation of descendent clones from founding sequence types in the Northeast. Estimates of the time scale of divergence of northeastern and midwestern populations suggest that B. burgdorferi was present in these regions of North America many thousands of years before European settlements. We conclude that B. burgdorferi populations have recently reemerged independently out of separate relict foci, where they have persisted since precolonial times.
Hoen
Anne Gatewood
AG
Department of Epidemiology and Public Health, Yale School of Medicine, New Haven, CT 06520, USA.
Margos
Gabriele
G
Bent
Stephen J
SJ
Diuk-Wasser
Maria A
MA
Barbour
Alan
A
Kurtenbach
Klaus
K
Fish
Durland
D
D000483:Alleles; D015373:Bacterial Typing Techniques; D001483:Base Sequence; D025065:Borrelia burgdorferi / Q000145:classification / Q000235:genetics* / Q000502:physiology; D004269:DNA, Bacterial / Q000235:genetics; D008193:Lyme Disease / Q000382:microbiology; D010802:Phylogeny; D014481:United States
D004269:DNA, Bacterial
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