title: Whole genome mapping and re-organization of the nuclear and mitochondrial genomes of Babesia microti isolates.
abstract: Babesia microti is the primary causative agent of human babesiosis, an emerging pathogen that causes a malaria-like illness with possible fatal outcome in immunocompromised patients. The genome sequence of the B. microti R1 strain was reported in 2012 and revealed a distinct evolutionary path for this pathogen relative to that of other apicomplexa. Lacking from the first genome assembly and initial molecular analyses was information about the terminal ends of each chromosome, and both the exact number of chromosomes in the nuclear genome and the organization of the mitochondrial genome remained ambiguous. We have now performed various molecular analyses to characterize the nuclear and mitochondrial genomes of the B. microti R1 and Gray strains and generated high-resolution Whole Genome maps. These analyses show that the genome of B. microti consists of four nuclear chromosomes and a linear mitochondrial genome present in four different structural types. Furthermore, Whole Genome mapping allowed resolution of the chromosomal ends, identification of areas of misassembly in the R1 genome, and genomic differences between the R1 and Gray strains, which occur primarily in the telomeric regions. These studies set the stage for a better understanding of the evolution and diversity of this important human pathogen.
authors.affiliation: Centre d'étude d'agents Pathogènes et Biotechnologies pour la Santé - UMR 5236, Montpellier, France ; Institut de Biologie Computationnelle, Montpellier, France.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Cornillot
authors.forename: Amina
authors.initials: A
authors.lastname: Dassouli
authors.forename: Aprajita
authors.initials: A
authors.lastname: Garg
authors.forename: Niseema
authors.initials: N
authors.lastname: Pachikara
authors.forename: Sylvie
authors.initials: S
authors.lastname: Randazzo
authors.forename: Delphine
authors.initials: D
authors.lastname: Depoix
authors.forename: Bernard
authors.initials: B
authors.lastname: Carcy
authors.forename: Stéphane
authors.initials: S
authors.lastname: Delbecq
authors.forename: Roger
authors.initials: R
authors.lastname: Frutos
authors.forename: Joana C
authors.initials: JC
authors.lastname: Silva
authors.forename: Richard
authors.initials: R
authors.lastname: Sutton
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Krause
authors.forename: Choukri Ben
authors.initials: CB
authors.lastname: Mamoun
mesh_terms: D000818:Animals; D041001:Babesia microti / Q000235:genetics*; D054629:Genome, Mitochondrial / Q000235:genetics*; D018503:Genome, Protozoan / Q000235:genetics*
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