title: Inter-strain variability of insertion/deletion events in the Encephalitozoon cuniculi genome: a comparative KARD-PFGE analysis.
abstract: We applied a two-dimensional pulsed-field gel electrophoresis procedure to the genomes of two karyotype variants assigned to two different strains of the microsporidian Encephalitozoon cuniculi, termed D (strain III) and F (strain II). Data obtained for BssHII and MluI restriction fragment length polymorphisms in each chromosome are compiled and compared to the reference strain I variant A. Six Insertion/Deletion (InDels) are found in subterminal position, some of these being characteristic of either D or F. Like in strain 1, the terminal fragments extending between each telomere and rDNA locus are conserved in length for each chromosome. They are however smaller than in reference variant. This size reduction is estimated to be 2.5 kbp for the strain III isolate and 3.5 kbp for the strain II isolate. We hypothesize that for the three E. cuniculi strains, all chromosome extremities are prone to a constant process of sequence homogenization through mitotic recombination between conserved regions.
authors.affiliation: Parasitologie Moléculaire et Cellulaire, LBP, UMR CNRS 6023, Université Blaise Pascal, Aubière, France.
authors.forename: J F
authors.initials: JF
authors.lastname: Brugere
authors.forename: E
authors.initials: E
authors.lastname: Cornillot
authors.forename: T
authors.initials: T
authors.lastname: Bourbon
authors.forename: G
authors.initials: G
authors.lastname: Metenier
authors.forename: C P
authors.initials: CP
authors.lastname: Vivarès
mesh_terms: D000818:Animals; D001426:Bacterial Proteins / Q000378:metabolism; D004275:DNA, Ribosomal / Q000235:genetics; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism; D004285:Dogs; D016521:Electrophoresis, Gel, Pulsed-Field; D009670:Encephalitozoon cuniculi / Q000145:classification* / Q000235:genetics*; D017353:Gene Deletion; D014644:Genetic Variation; D018503:Genome, Protozoan; D007621:Karyotyping; D051379:Mice; D016133:Polymerase Chain Reaction; D011995:Recombination, Genetic; D015183:Restriction Mapping / Q000379:methods*; D016615:Telomere / Q000235:genetics
chemical_list: D001426:Bacterial Proteins; D004275:DNA, Ribosomal; C044171:endodeoxyribonuclease BSSHII; C035041:endodeoxyribonuclease MluI; D015252:Deoxyribonucleases, Type II Site-Specific