Microbiota of Sand Flies: History
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Contributor:
Ahmed Tabbabi
,
Daiki Mizushima
,
,
Hirotomo Kato

Sand flies are a significant public health concern in many parts of the world where they are known to transmit agents of several zoonotic diseases to humans, such as leishmaniasis. Vector control remains a key component of many anti-leishmaniasis programs and probably will remain so until an effective vaccine becomes available. The sand fly gut microbiota has recently emerged as an encouraging field for the exploration of vector-based disease control. In particular, the gut microbiome was previously reported to either enhance or inhibit parasite activity depending on the species of bacteria and, thus, has the potential to alter vector competence. 

  • sand fly
  • microbiome
  • Leishmania
  • vector competence

1. Introduction

Phlebotomine sand flies (Diptera: Psychodidae) are tiny blood-sucking insects that feed on a wide range of hosts and potentially act as vectors of pathogens responsible for human and animal diseases worldwide. Of the more than 1000 sand fly species that have been described to date, approximately 10% are suspected or proven vectors of various pathogens, including arboviruses and bacteria, but are best known as the principal vectors of Leishmania, the etiological agent of leishmaniasis, a neglected tropical disease [1][2]. Leishmania have two main lifecycle stages: the motile flagellated promastigote, which is present in the sand fly vector, and the intracellular non-flagellated amastigote, which is present within mammalian host cells. Around 20 Leishmania species are known to be pathogenic to humans with clinical symptoms varying from localized, self-limiting cutaneous lesions and severe diffuse and destructive mucocutaneous lesions, to a disseminating visceral infection that is fatal in the absence of treatment [1]. The disease remains a public health problem worldwide, affecting approximately 12 million people in 98 countries, where 350 million people are at risk of infection [3]. An estimated 1.3 million new cases occur each year and cause 20,000 to 30,000 deaths per year [4]. At present, leishmaniasis is undergoing a type of synergy between natural phenomena and man-made conditions that facilitate the spread of the disease, with limited vaccines available and no effective therapeutic treatments against any form of human leishmaniasis [5][6]. Vector control is currently one of the most effective ways to prevent disease transmission. Advances that support evidence-based vector control can be leveraged to further optimize planning and implementation.
Over the last decade, microbial communities associated with sand flies gained relevance, as they have an important impact on the development of the parasite Leishmania in the host’s digestive tract [7]. Since the application of molecular methods, novel culture-independent techniques have been developed to study microbial communities in sand flies [8][9], while several studies have used culture-dependent approaches [10][11]. The sand fly microbiota is a dynamic community mostly acquired from the environment, as in other Insecta or Diptera. Sand flies become infected with Leishmania when they feed on the blood of an infected host in order to develop eggs and reproduce. The Leishmania developmental life cycle within the sand fly vector occurs exclusively in the mid- and hindgut with the presence of symbiotic bacteria; therefore, possible bacteria-parasite interactions occur between the microbial community of the gut and parasite [12][13]. In addition to blood, they take sugar meals from a number of different sources, including the sap of plants or honeydew, through which they may acquire plant bacteria [14].
Although the role of the gut microbiome in the biological cycle of insects is widely recognized, factors modulating the composition of the gut microbiota of sand flies are still poorly defined. Lastly, many studies have aimed to clarify interactions among insect gut microbiota and diet, the local ecosystem and climatic conditions, phylogeny, and life stage. Previous studies reported that variation in the microbiota residing in the insect gut might be mainly explained by the host habitat, diet, developmental stage, and phylogeny all contributing to the structure of insect gut microbiota [15]. Sampling location has been reported to strongly affect the gut microbial community structure of mosquitoes [16], while the composition of the gut microbial community in turtle ants was better explained and influenced by host species [17].
A better understanding of vector-microbiota-pathogen interactions is vital, as it can lead to the discovery of new tools to block disease transmission and provide critical information for the development of intervention strategies for sand fly control. Scientists have discovered a new malaria transmission-blocking microbe in Anopheles mosquitoes [18] and Wolbachia endosymbionts have already been used successfully when introduced in Aedes aegypti to block the transmission of the dengue virus [19][20][21].
Paratransgenesis is an alternative approach to control disease transmission. In this strategy, bacterial flora native to disease-transmitting vectors are engineered to interfere with pathogen transmission [22][23]. The principal and essential step in paratransgenesis is the identification of suitable bacteria in the vector. These microorganisms should possess the main advantages of being non-pathogenic, easy to cultivate, and easy to genetically manipulate. For example, Bacillus (B.) subtilis and Brevibacterium linens isolated from the kala-azar vector Phlebotomus (Ph.) argentipes are currently being considered as possible candidates for paratransgenesis aimed at preventing Leishmania (L.) donovani transmission [24]. The same researchers illustrated the initial proof-of-concept of the paratransgenic approach to Ph. argentipes under laboratory conditions. They demonstrated the ability of Green Fluorescent Protein (GFP)- expressing B. subtilis to colonize the insect gut [25].

2. Diversity and Composition of the Microbiome in Sand Flies

2.1. Microbiota of Different Sand Fly Developmental Stages

Ingested food and environmental microbes generate larval and adult gut content microbiota. Previous studies on gut microbiota abundance showed that most of these larval-stage bacteria undergo biodegradation during the pupal stage and the bacterial load suddenly and significantly decreases after adult emergence [12][26]. The bacterial composition of larvae, pupae, and newly emerged adults of colony-reared Ph. duboscqi was initially investigated using standard bacteriological approaches [26]. Ochrobactrum anthropi was consistently the predominant bacterium at different growth stages, suggesting the presence of bacterial transtadial passage. A more recent study showed the occurrence of Microbaterium sp. in immature and adult stages of the same colony-reared sand fly species [12]. On the other hand, many bacterial species were identified in field and laboratory-reared sand flies from the same species [10]. This bacterium is known as a soil microorganism, indicating the influence of external microbial populations on the gut microbiota of immature sand fly stages [27]. This finding suggests that environments play important roles in the colonization of sand flies. The gut composition microbiota across larvae, pupae, and adults of Lu. evansi collected from the same locality was recently identified and included a number of soil microorganisms such as Enterobacter, Pseudomonas, Bacillus, and Lysobacter genera [28]. The presence of microbial strains in both larvae and adult sand flies will help to implement new efficient biological approaches for the control of sand fly populations in order to prevent Leishmania transmission. In a recent study, the genus Lysinibacillus was found in the immature (larvae) and adult stages, suggesting that species within this genus could remain transstadially associated with the sand fly [29]. It is important in this context to note that most reports focused on the gut microbial content of field and reared adult sand flies due to the inaccessibility of larvae and pupae in the field.

2.2. Microbiota of Wild and Laboratory Sand Flies

2.2.1. New World Sand Flies

Microbiota composition was analyzed in both laboratory strains and wild populations. The first publication on the gut microbiota composition of New World adult sand flies used a reared laboratory colony and different Lu. longipalpis populations collected from Brazil [30][31][32]. The composition of the adult midgut microbiota among different Lu. longipalpis populations and reared laboratory colonies showed shared opportunistic pathogenic, environmental, and gut-associated bacterial species including Pantoea agglomerans, Stenotrophomonas maltophilia, Enterobacter cloacae, Pseudomonas sp., and Serratia marcescens. More recent studies on this sand fly species collected from field and laboratory-reared colonies showed that shared bacteria were Pantoea, Serratia, Stenotrophomonas, and Erwinia genera [13][14][30][31][32][33][34]. In the same way, Staphylococcus, Clostridium, and Bacillus genera belonging to the Firmicutes phylum were identified in Lu. longipalpis colony and field-captured insects [35][36][37]. These bacterial genera are known as pathogenic to several organisms, and the Bacillus genus is currently being considered as a possible candidate for paratransgenesis aimed at preventing Leishmania infection [38][39]. These findings indicate the capacity of some bacteria to persist in this sand fly species, despite the difference in field and laboratory conditions.

2.2.2. Old World Sand Flies

Microbiota composition was analyzed in both laboratory strains and wild Ph. perniciosus populations collected from Tunisia [10]. Stenotrophomonas maltophilia, Bacillus sp., and Lysinibacillus sp. were identified in both groups of sand flies. These findings indicate that vector control strategies based on modern biotechnological tools in the laboratory might be applicable in the field.

2.3. Microbiota and Sand Fly Species

The microbiota composition of sand flies was largely summarized in a previous meta-analysis study that included all data obtained until 2017 [10].

2.3.1. New World Sand Fly Species

The bacterial flora shared between different New World sand fly species collected from the field can be compared with the microbiota of field and laboratory-reared sand flies from the same species. Currently, bacterial communities have been investigated in seven New World sand fly species collected in the field: Lu. evansi [28], Lu. longipalpis [14][30][32][33], Lu. cruzi [14], Lu. intermedia [40], Nyssomyia (Ny.) neivai (synonymous Lu. neivai) [41], Lu. ayacuchensis [42], and Pintomyia (Pi.) (Pifanomyia) evansi [43]. Very few shared bacteria were identified in these sand fly species collected from the field, probably due to diverse habitats and blood host origins. Staphylococcus agnetis, potentially pathogenic to poultry [44] and associated with bovine mastitis [45], was shared among Lu. cruzi, Lu. evansi, and Lu. longipalpis. Pelomonas sp. was shared between Ny. neivai and Lu. intermedia, also found in other insects [46]. Three universal bacterial species were identified in three sand fly species: Lu. evansi, Lu. intermedia, and Lu. longipalpis: Acinetobacter calcoaceticus, known for triggering a detectable immune response in tsetse flies [47], Enterobacter aerogenes (found in other insects and potential pathogen to humans) [48], and Pseudomonas putida (associated with soil and water) [49][50]. On the other hand, Ralstonia sp. (a plant-associated species) [14] was shared among Ny. neivai, Lu. intermedia, and Pi. evansi; Lawsonella sp. and Corynebactrium sp. (found in other insects) [51][52] between Lu. ayacuchensis and Lu. evansi; Escherichia sp. between Lu. longipalpis and Lu. evansi.

2.3.2. Old World Sand Fly Species

The microbial gut content of Ph. papatasi females has been largely explored. The first publication identified a species pathogenic to humans, Enterobacter cloaceae [53], from Egyptian sand flies [54]. More recently, Microbacterium sp., pathogenic to insects [55], was detected in Moroccan sand flies [12]. Several groups of researchers conducted the same kinds of experiments in Tunisia, Turkey, and India, and the Bacillus genus was the most dominant among genera [56]. Similar results were obtained in Iran and several bacteria genera and species were identified including Acinetobacter, Enterobacter, Microbacterium, Staphylococcus, Terribacillus, B. cereus, B. flexus, B. licheniformis, B. pumilus, B. subtilis, Pseudomonas aeruginosa, and Serratia marcescens. This last species was previously found associated with wild Lu. longipalpis [33] and is also lethal to Leishmania in vitro [57]. A recent study showed that B. subtilis and Enterobacter cloacae were shared among the Ph. papatasi habitat, rodent Rhombomys opimus, and sand fly gut [58]. Other studies on the gut microbial contents of different sand fly species in Iran and India including Ph. sergenti, Ph. kandelakii, Ph. perfiliewi, Ph. halepensis, and Ph. argentipes showed that they share the Bacillus genus with Ph. papatasi [11][24][59][60]. The Pseudomonas genus was identified recently in Ph. chinensis collected from China and shared with the sand flies cited above, except Ph. argentipes [8]. In a report, the researchers showed the influence of both sand fly species and habitats on the microbial gut content of Ph. perniciosus collected from Tunisia [10]. An extensive meta-analysis  showed proportions of Acinetobacter baumanii, Escherichia coli, Stenotrophamonas maltophila, B. subtilis, Staphylococcus epidermidis, Acinetobacter sp., Enterobacter sp. Klebsiella ozaenae, and Serratia sp. among at least three phlebotomine insects from the Old and New World. A more recent paper showed that host species determine the composition of the prokaryotic microbiota in Phlebotomus sand flies collected from Greece [61]. Ph. papatasi microbiota was the most distinct from Ph. Neglectus, Ph. tobbi, and Ph. similis, dominated by Spiroplasma, Wolbachia, and Paenibacillus.

3. Gut Microbiota Alterations and Their Impact on Flies’ Life Traits and Leishmania Infection

3.1. Gut Microbiota Alterations and Their Impact on Flies’ Life Traits

A previous study reported that the sand fly gut microbiota influences different aspects of flies’ life traits [62]. According to this report, the process of laying eggs was more efficient in Lu. longipalpis flies fed on rabbit feces than those fed on sterilized feces, which eliminates all rabbit intestinal track-supplied bacteria. The larvae from this last habitat showed delayed hatching and lower survival rates. When different bacteria were reintroduced into sterile feces, there were wide differences in hatching time and survival. On the other hand, it has been demonstrated that all L1-larvae were hatched from homogeneous disinfected eggs and developed on sterilized material [63]. It is important to mention that although bacterial diversity decreases after a blood meal, bacterial numbers actually increase [13][26]. These findings provide new data on microbial dynamics in the sand fly gut which may be used for the development of novel control strategies. The larval nutrition associated with the putative breeding sites of the sand fly Lu. longipalpis might affect their oviposition, development, microbiome, and susceptibility to Leishmania which plays an important role in the epidemiology of leishmaniasis [63].

3.2. Gut Microbiota Alterations and Their Impact on Leishmania Infection

The influence of the microbial contents on Leishmania development in sand flies was investigated in several previous studies. Serratia marcescens, which are considered to be pathogenic bacteria for many insects [64], negatively affect L. infantum chagasi and L. braziliensis by inducing lysis in vitro of the parasite cell membrane [57][65]. Furthermore, it has been demonstrated in vivo that the infection rate of L. mexicana in Lu. longipalpis sand flies was reduced when fed on Pseudozyma sp., Asaia sp., or Ochrobactrum intermedium [66]. The same experiments, in which L. mexicana colonized the sand fly gut prior to being fed Serratia marcescens, showed that the survival of flies with a Leishmania infection was significantly higher compared with those without Leishmania infection. This might be due to the protection offered by Leishmania to the sand fly from the bacterial infection or to modulation of the host immunity response by this parasite, as reported in other models such as Anopheles gambiae infected with Plasmodium [67]. In the same context, Ph. papatasi was treated with an antibiotic cocktail to deplete gut bacteria and was experimentally infected by Leishmania. The bacterial composition of the gut was previously reported to either enhance or inhibit Leishmania activity. Previous studies showed that treatment with antibiotics reduces the richness and diversity of microbiota, but Leishmania infection increases, indicating that the microbiota can be a barrier to the establishment and development of promastigotes in Ph. papatasi and Pi. evansi [43][68]. These findings strengthened the theory that any manipulation that reduces the size and/or diversity of the natural microbiota should enhance the ability of Leishmania to establish infections in sand flies or other pathogens in mosquitoes [69]. It has been demonstrated that endosymbionts, such as Microsporidia infections, were more frequently associated with guts without Leishmania infection, whereas Arsenophonus was only found in guts with a high load of Leishmania infection and treated with antibiotics [43]. It has been shown that Microsporodia impairs Plasmodium falciparum transmission in Anopheles arabiensis mosquitoes [70]. This finding is in agreement with the previous study of the potential influence of this endosymbiont on Leishmania. On the other hand, in Ph. dubosqui and Lu. longipalpis, treatment with antibiotics results in females being highly refractory to the development of transmissible infections [7][13]. It has been demonstrated, for example, that sucrose utilization by the microbiota is essential to promote the appropriate osmotic conditions required for the survival of infective stage promastigotes in vivo [7]. Together, these diverse data suggest that the sand fly midgut microbiome is a critical factor for Leishmania growth and differentiation to its infective state prior to disease transmission. As part of a paratransgenic approach, further studies are needed to identify candidate bacteria that can be used, or other biological approaches, to control sand fly populations and Leishmania transmission [10]. A more recent study showed that Lysinibacillus, Pseudocitrobacter, and Serratia, which are potential candidates for paratransgenic or biological control, strongly inhibited Leishmania growth and survival in vitro and co-infected Lu. longipalpis [29].

4. Fungi Associated with the Midgut of Sand Flies

Although the bacterial component of sand fly microbiota has been investigated in several studies, few papers reported on the fungal diversity in sand flies [33][59][71]. A comparative analysis of fungal communities revealed the absence of fungi in Lu. longipalpis guts collected from an endemic area, whereas fungi were found in a non-endemic area, including Cunninghamella bertholletiae, Peronospora conglomerata, Mortierella verticillata, and Toxicocladosporium irritans [33], suggesting that fungi are excluded in the presence of Leishmania. However, contradictory findings identified fungal genera in sand flies collected from endemic areas of northern Iran and southern Peru, including Ph. papatasi, Ph. sergenti, Ph. kandelakii, Ph. perfiliewi, Ph. halepensis, and Lu. ayachensis [42][59]. In these areas, species belonging to Penicillium, Aspergillus, Acremonium, Fusarium, Geotrichum, Candida, and Malassezia genera were identified [42][59][71]. However, it was not possible to elucidate their role or conclude any outcomes regarding potential pathogenic effects or interactions with Leishmania.

This entry is adapted from the peer-reviewed paper 10.3390/parasitologia2020008

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