ISSN:
1432-1432
Keywords:
β-tubulin
;
Evolution
;
Gene cluster
;
Gene dispersion
;
Drosophila montium subgroup
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract The β1-, β2-, and β3-tubulin genes have been mapped by in situ hybridization on the polytene chromosomes of 11 selected species (15 strains) belonging to the Drosophila montium subgroup. Although the hybridization pattern among the strains of the same species does not differ, this pattern is significantly different among the species. The β-tubulin genes in the montium subgroup seem to be organized in a cluster, or in a semi-cluster, or are completely dispersed. The clustered arrangement is found in the North-Oriental sibling species D. auraria, D. triauraria, and D. quadraria. The semi-clustered arrangement, wherein the β1 and β2 genes are located at the same locus while β3 is at a different one, appears in the South-Oriental species D. bicomuta, D. serrata, and D. birchii, as well as in the Afrotropical species D. diplacantha and D. seguyi. The complete separation of the genes is observed in the Indian species D. kikkawai and D. jambulina and in the Afrotropical species D. vulcana. Based on the above results, a possible mode of evolution of the β-tubulin genes in the montium subgroup is attempted. In addition, phylogenetic relationships among the montium species are discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00186541
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