Inversion polymorphism and a new polytene chromosome map of <Emphasis Type="Italic">Zaprionus indianus</Emphasis> Gupta (1970) (Diptera: drosophilidae) |
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Authors: | Galina Ananina Cláudia Rohde Jean R David Vera L S Valente Louis B Klaczko |
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Institution: | 1.Departamento de Genética e Evolu??o, Instituto de Biologia,Universidade Estadual de Campinas, UNICAMP,Campinas,Brazil;2.Departamento de Genética, Instituto de Biociências,Universidade Federal do Rio Grande do Sul.,Porto Alegre,Brazil;3.Centro Acadêmico de Vitória,Universidade Federal de Pernambuco, rua do Alto do Reservatório,Santo Ant?o,Brazil;4.Laboratoire Evolution, Génomes et Spéciation,Centre National de la Recherche Scientifique,Gif sur Yvette Cedex,France |
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Abstract: | Zaprionus indianus is a recent invader in Brazil and was probably introduced from the West Afrotropical zone. So far, studies regarding its
chromosomal polymorphism were limited to India. We found that Brazilian populations were very different from Indian ones.
Five new inversions have been discovered. In(II)A, already described in India, where it is quite common, has also been found in Brazil, where it is very rare. The X-chromosome
has three inversions; In(X)Na, In(X)Ke and In(X)Eg, which are frequent in all Brazilian populations studied. In every case, we observed strong linkage disequilibrium among
these gene arrangements. During the primary collection period (2001–2002), we noticed a significant positive correlation between
the frequency of these inversions and latitude, but this was not confirmed in later investigations. Rearrangement In(IV)EF was also common in all populations, while inversion In(V)B was only found in southern populations. Our data suggest that the founders that recently invaded Brazil were polymorphic
for the six inversions observed. The place of origin might be identified more precisely by investigating West African populations.
In order to facilitate further investigations, we present an updated polytene chromosome photomap, locating the breakpoints
of every inversion observed in Brazilian populations.
Galina Ananina and Cláudia Rohde contributed equally to this work |
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Keywords: | Chromosomal polymorphism Haplotype Introduced species Invasion Inversion breakpoints Linkage disequilibrium |
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