title: Rearrangement hotspots in the sex chromosome of the Palearctic black fly Simulium bergi (Diptera, Simuliidae).
abstract: An extreme example of nonrandom rearrangements, especially inversion breaks, is described in the polytene chromosomes of the black fly Simulium bergi Rubtsov, 1956 from Armenia and Turkey. A total of 48 rearrangements was discovered, relative to the standard banding sequence for the subgenus Simulium Latreille, 1802. One rearrangement, an inversion (IIS-C) in the short arm of the second chromosome, was fixed. Six (12.5%) of the rearrangements were autosomal polymorphisms, and the remaining 41 (85.4%) were sex linked. More than 40 X- and Y-linked rearrangements, predominantly inversions, were clustered in the long arm of the second chromosome (IIL), representing about 15% of the total complement. The pattern conforms to a nonrandom model of chromosome breakage, perhaps associated with an underlying molecular mechanism.
authors.affiliation: Department of Agricultural and Environmental Sciences, 130 McGinty Court, Clemson University, Clemson, SC 29634-0310 USA.
authors.forename: Peter H
authors.initials: PH
authors.lastname: Adler
authors.affiliation: Department of Parasitology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey.
authors.forename: Alparslan
authors.initials: A
authors.lastname: Yildirim
authors.affiliation: Department of Parasitology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey.
authors.forename: Zuhal
authors.initials: Z
authors.lastname: Onder
authors.affiliation: Department of Parasitology, Faculty of Veterinary Medicine, Kafkas University, Kars, Turkey.
authors.forename: G Taskin
authors.initials: GT
authors.lastname: Tasci
authors.affiliation: Department of Parasitology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey.
authors.forename: Onder
authors.initials: O
authors.lastname: Duzlu
authors.affiliation: Department of Microbiology, Faculty of Medicine, Kafkas University, Kars, Turkey.
authors.forename: M Ozkan
authors.initials: MO
authors.lastname: Arslan
authors.affiliation: Department of Parasitology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey.
authors.forename: Arif
authors.initials: A
authors.lastname: Ciloglu
authors.affiliation: Department of Parasitology, Faculty of Veterinary Medicine, Kafkas University, Kars, Turkey.
authors.forename: Baris
authors.initials: B
authors.lastname: Sari
authors.affiliation: Department of Parasitology, Faculty of Veterinary Medicine, Kafkas University, Kars, Turkey.
authors.forename: Nilgun
authors.initials: N
authors.lastname: Parmaksizoglu
authors.affiliation: Department of Parasitology, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey.
authors.forename: Abdullah
authors.initials: A
authors.lastname: Inci
keywords: Caucasus Mountains; nonrandom breakage; polytene chromosomes; sex linkage