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A Review on the Progress of Sex-Separation Techniques For Mashatola et al. Parasites & Vectors 2018, 11(Suppl 2):646 https://doi.org/10.1186/s13071-018-3219-4 REVIEW Open Access A review on the progress of sex-separation techniques for sterile insect technique applications against Anopheles arabiensis Thabo Mashatola1,2,3, Cyrille Ndo4,5,6, Lizette L. Koekemoer1,2, Leonard C. Dandalo1,2, Oliver R. Wood1,2, Lerato Malakoane1,2, Yacouba Poumachu3,4,7, Leanne N. Lobb1,2, Maria Kaiser1,2, Kostas Bourtzis3 and Givemore Munhenga1,2* Abstract The feasibility of the sterile insect technique (SIT) as a malaria vector control strategy against Anopheles arabiensis has been under investigation over the past decade. One of the critical steps required for the application of this technique to mosquito control is the availability of an efficient and effective sex-separation system. Sex-separation systems eliminate female mosquitoes from the production line prior to irradiation and field release of sterile males. This is necessary because female mosquitoes can transmit pathogens such as malaria and, therefore, their release must be prevented. Sex separation also increases the efficiency of an SIT programme. Various sex-separation strategies have been explored including the exploitation of developmental and behavioural differences between male and female mosquitoes, and genetic approaches. Most of these are however species-specific and are not indicated for the major African malaria vectors such as An. arabiensis. As there is currently no reliable sex-separation method for An. arabiensis, various strategies were explored in an attempt to develop a robust system that can be applied on a mass- rearing scale. The progress and challenges faced during the development of a sexing system for future pilot and/or large-scale SIT release programmes against An. arabiensis are reviewed here. Three methods of sex separation were examined. The first is the use of pupal size for gender prediction. The second is the elimination of blood-feeding adult females through the addition of an endectocide to a blood meal source. The third is the establishment of a genetic sexing strain (GSS) carrying an insecticide resistance selectable marker (dieldrin-resistance rdl gene and/or other GABA receptor antagonists that can be used as alternative insecticides to dieldrin) or a temperature-sensitive lethal marker. Keywords: Anopheles arabiensis, sterile insect technique, sex-separation, genetic sexing strain Background also has a direct impact on national economies, education Malaria is a major global health problem responsible for and social development [1, 2]. approximately 216 million cases and 445,000 deaths world- Various vector control interventions such as larval wide in 2016 alone [1]. An estimated 80% of malaria-related source management, distribution of insecticide-treated deaths occur in sub-Saharan Africa, particularly in pregnant bednets (ITNs) and indoor residual spraying (IRS) of women and children below the age of five years. By affect- formulated insecticides have contributed significantly to- ing health at the personal and community levels, malaria wards suppression of the global malaria burden [3–5]. However, the burgeoning incidence of insecticide resist- ance in target vector populations is threatening control * Correspondence: [email protected] efforts [6–8], as is the diversity of malaria vector species 1 Centre for Emerging Zoonotic and Parasitic Diseases, National Institute for assemblages which often include outdoor-resting and Communicable Diseases of the National Health Laboratory Service, Johannesburg, South Africa feeding components that are less susceptible to control 2Wits Research Institute for Malaria, MRC Collaborating Centre for by indoor applications of insecticide [9, 10]. To address Multi-Disciplinary Research on Malaria, School of Pathology, Faculty of Health these challenges, supplementary vector control interven- Sciences, University of the Witwatersrand, Johannesburg, South Africa Full list of author information is available at the end of the article tions that are effective, environmentally friendly and © The Author(s). 2018 Open Access This is an open access article distributed under the terms of the Creative Commons Attribution IGO License (https://creativecommons.org/licenses/by/3.0/igo/) which permits unrestricted use, distribution, and reproduction in any medium, provided appropriate credit to the original author(s) and the source is given. Mashatola et al. Parasites & Vectors 2018, 11(Suppl 2):646 Page 128 of 171 economical are required. Numerous technologies with an operational level [42]. Investigations and the develop- potential such as transgenics including gene drive, Wol- ment of various robust sexing strategies that can be ap- bachia-based methods and the sterile insect technique plied on a mass scale are therefore being conducted in (SIT) are currently under development or are undergo- an attempt to address this shortfall. The progress, chal- ing open field-testing and validation [11–20]. lenges and lessons learned from these investigations, and The SIT has been successfully applied as an area-wide future prospects, are reported here. integrated vector management (AW-IVM) method against several insect pests [21, 22]. This technique in- Use of pupal size for gender prediction volves the serial release of laboratory mass-produced In many insect species, female pupae are usually larger sterile insects, usually males, at a ratio that effectively in- than their male counterparts [43]. This phenomenon, undates a target wild population. This forces the major- known as sexual size dimorphism, is a trait that has been ity of females to mate with sterile males, substantially exploited for mechanical separation means, with numer- reducing their fecundity, and resulting in population ous mechanical devices developed for mosquitoes. Exam- suppression [21]. ples include standard sieves, the Fay-Morlan glass plate Attempts to use the SIT against mosquitoes dates back and the McCray adjustable opening separation system that six decades [23]. Since then substantial research, answer- have been used to separate male and female pupae in ing key questions on mosquitoes and the SIT, has been Aedes aegypti, Ae. albopictus and Culex quinquefasciatus conducted [11]. For the African malaria vector An. ara- [44–47]. Attempts to use sexual size dimorphism in An. biensis several research activities are underway in albimanus were without success during the 1972 sterile Reunion Island, Sudan and South Africa. Data on the male release study in El Salvador [48]. It was observed that following aspects has been generated: (i) colonization An. albimanus male and female pupal sizes overlap sub- and rearing conditions [24, 25], and (ii) male sterility in- stantially, thus making efficient sexing by size difficult. To duction through irradiation and related longevity, mat- our knowledge, this assumption has never been tested in ing competitiveness, mating compatibility [24, 26–30], other anophelines. and means of transportation to release localities [24, 26]. Recently, pupal size dimorphism was investigated in a In addition to these, field study site selection, and assess- South African An. arabiensis strain. Pupal cephalothorax ments of the monthly species and genetic abundances, sizes of larvae reared on a standard larval diet were and variability of wild populations have been undertaken measured and recorded by gender. Cephalothorax size [31–33]. A study on the technical and social perspectives in males averaged 3.64 mm while those of females aver- of using the SIT to control malaria has been conducted aged 3.66 mm. These are not significantly different, as [34], including the recent knowledge, attitude and prac- has also been noted in An. albimanus. These data are tices (KAP) survey performed in South Africa in an area consistent with other reports that pupal size sexual selected for pilot SIT releases [35]. Before the SIT can be dimorphism is not apparent in anophelines [49]. Com- applied at an operational level, there is one critical as- pounding this, the results also illustrated a greater vari- pect remaining. This is the development of a robust sex ation in pupal size in males compared to females, separation system to exclusively obtain males prior to re- making the use of sieve and Fay-Morlan glass plate leases [36, 37]. sex-separation technically challenging and even less reli- An efficient sex separation system is essential for any able. It was consequently concluded that this method of mosquito SIT-based control programme for several rea- sex-separation is not viable for An. arabiensis. sons. The most important reason is that released females have the potential to transmit malaria or other disease Addition of toxicants to blood meal sources to eliminate pathogens [38], thus putting the human population at blood-feeding females risk. Also, the co-release of laboratory females can As only female mosquitoes take blood meals, this interfere with the frequency at which sterile males mate auto-segregation is a highly alluring feature that might with wild females, thus decreasing the effectiveness of be exploited by adding a toxicant to a blood meal the SIT programme. This has been demonstrated in the (blood-spiking) so as to eliminate blood-feeding females. Mediterranean fruit fly (medfly) where, by releasing This approach was used in an SIT programme in El males only, the effectiveness of the SIT programme was Salvador against An. albimanus by adding malathion to increased [39, 40]. a citrated
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