Discovery and characterization of chromosomal inversions in the arboviral vector mosquito Aedes aegypti
Liang, J.; Rose, N. H.; Brusentsov, I. I.; Lukyanchikova, V.; Karagodin, D. A.; Feng, Y.; Yurchenko, A. A.; Sylla, M.; Lutomiah, J.; Badolo, A.; Aribodor, O. B.; Ayala, D.; Acosta, C. G.; Alto, B. W.; Ahmad, N. W.; Tu, Z.; Gloria-Soria, A.; Black, W. C.; Powell, J.; Sharakhov, I. V.; McBride, C. S.; Sharakhova, M. V.
Show abstract
Chromosomal inversions play a fundamental role in evolution and have been shown to regulate epidemiologically important traits in malaria mosquitoes. However, they have never been characterized in Aedes aegypti, the major vector of arboviruses, because of the poor structure of its polytene chromosomes. In this study, we applied a Hi-C proximity ligation approach to identify chromosomal inversions in 25 strains of Ae. aegypti, acquired from its worldwide distribution, as well as in one strain of Ae. mascarensis. The study identified 21 multi-megabase inversions with uneven distributions along the three chromosomes. All chromosomal inversions, including one specific for Ae. mascarensis, were polymorphic. Nevertheless, geographic origin separated the strains into two clusters carrying African and non-African inversions suggesting their potential association with Ae. aegypti subspecies. Some of the inversions colocalized with chemoreceptor genes and quantitative trait loci associated with pathogen infection, implicating the potential role of inversions in host choice and disease transmission.
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