Polytene chromosome maps in four species of tsetse flies Glossina austeni, G. pallidipes, G. morsitans morsitans and G. m. submorsitans (Diptera: Glossinidae): a comparative analysis |
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Authors: | Gariou-Papalexiou A Yannopoulos G Robinson A S Zacharopoulou A |
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Institution: | (1) Department of Biology, University of Patras, Patras, Greece;(2) Entomology Unit, FAO/IAEA Agriculture and Biotechnology Laboratory, A-2444 Seibersdorf, Austria |
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Abstract: | Photographic polytene chromosome maps from pupal trichogen cells of four tsetse species, Glossina austeni, G. pallidipes, G. morsitans morsitans and G. m. submorsitans were constructed and compared. The homology of chromosomal elements between the species was achieved by comparing banding
patterns. The telomeric and subtelomeric chromosome regions were found to be identical in all species. The pericentromeric
regions were found to be similar in the X chromosome and the left arm of L1 chromosome (L1L) but different in L2 chromosome
and the right arm of L1 chromosome (L1R). The L2 chromosome differs by a pericentric inversion that is fixed in the three
species, G. pallidipes, G. morsitans morsitans and G. m. submorsitans. Moreover, the two morsitans subspecies appeared to be homosequential and differ only by two paracentric inversions on XL and L2L arm. Although a degree
of similarity was observed across the homologous chromosomes in the four species, the relative position of specific chromosome
regions was different due to chromosome inversions established during their phylogeny. However, there are regions that show
no apparent homology between the species, an observation that may be attributed to the considerable intra—chromosomal rearrangements
that have occurred following the species divergence. The results of this comparative analysis support the current phylogenetic
relationships of the genus Glossina. |
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Keywords: | Chromosome maps Glossina austeni G pallidipes G morsitans morsitans G m submorsitans Polytene chromosomes Tsetse flies |
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