The online version of this article (doi:10.1186/1475-2875-11-208) contains supplementary material, which is available to authorized users.
The authors declare that they have no competing interests.
HY carried out the experiments and collected the data for the egg-dieldrin exposures, and drafted the manuscript. JG as project supervisor, oversaw the design of the egg- exposure study, as well as the progress of the manuscript, and managed the collaboration between authors. CAM together with SMS created the GSS ANO IPCL1 and provided the manuscript for this section. MQB performed the dose–response assays, provided essential expertise for the egg exposure experiments and contributed greatly to the development and editing of the manuscript. CFO designed and performed the radiation induced sterility study and completed the statistical analysis for this study, as well as for the egg exposure experiments in this manuscript. All authors read and approved the final manuscript.
The sterile insect technique (SIT) has been used with success for suppressing or eliminating important insect pests of agricultural or veterinary importance. In order to develop SIT for mosquitoes, female elimination prior to release is essential as they are the disease-transmitting sex. A genetic sexing strain (GSS) of Anopheles arabiensis was created based on resistance to dieldrin, and methods of sex separation at the egg stage were developed. The use of this strain for SIT will require sexually sterile males: useful radiation doses for this purpose were determined for pupae and adults.
For the creation of the sexing strain, dieldrin-resistant males were irradiated with 40 Gy using a 60Co source and were subsequently crossed to homozygous susceptible virgin females. Individual families were screened for semi-sterility and for male resistance to dieldrin. For sex separation, eggs of a resulting GSS, ANO IPCL1, were exposed to varying concentrations of dieldrin for different durations. Percent hatch, larval survival, and male and female emergence were recorded. Radiation induced sterility was determined following adult and pupa exposure to gamma rays at 0–105 Gy. Mortality induced by dieldrin treatment, and levels of sterility post radiation were investigated.
ANO IPCL1 contains a complex chromosome aberration that pseudo-links the male-determining Y chromosome and dieldrin resistance, conferring high natural semi-sterility. Exposure of eggs to 2, 3, and 4 ppm dieldrin solutions resulted in complete female elimination without a significant decrease of male emergence compared to the controls. A dose of 75 Gy reduced the fertility to 3.8 and 6.9% when males were irradiated as pupae or adults respectively, but the proportions of progeny of these males reaching adulthood were 0.6 and 1.5% respectively
The GSS ANO IPCL1 was shown to be a suitable strain for further testing for SIT though high semi-sterility is a disadvantage for mass rearing.
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- Genetic sex separation of the malaria vector, Anopheles arabiensis, by exposing eggs to dieldrin
Mark Q Benedict
Colin A Malcolm
Clelia F Oliva
Sharon M Soliban
Jeremie RL Gilles
- BioMed Central
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