Allergy to Edible Insects: A Computational Identification of the IgE-Binding Cross-Reacting Allergen Repertoire of Edible Insects

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Chapter 4
Allergy to Edible Insects: A Computational
Identification of the IgE-Binding Cross-Reacting
Allergen Repertoire of Edible Insects
Pierre Rougé and Annick Barre
Additional information is available at the end of the chapter
http://dx.doi.org/10.5772/68124
Provisional chapter
© 2016 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons
Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution,
and reproduction in any medium, provided the original work is properly cited.
DOI: 10.5772/68124
Allergy to Edible Insects: A Computational
Identication of the IgE-Binding Cross-Reacting
Allergen Repertoire of Edible Insects
Pierre Rougé and Annick Barre
Additional information is available at the end of the chapter
Abstract
Allergic manifestations to the ingestion of edible insects have been reported, espe-
cially in countries where edible insects are traditionally consumed. However, to date,
allergens of edible insects have been poorly investigated. The AllergenOnline server
was used for assessing the allergenic character of the putative IgE-binding cross-
reactive allergens from the consumed yellow mealworm, silkworm, house y maggot,
migratory locust, house cricket, greater wax moth, black soldier y, American grass-
hopper and Indian mealmoth. Positive hits correspond to allergens exhibiting >35%
identity over an 80-residue sliding window and 100% identity over an 8-residue slid-
ing window, respectively. Most of the hits consist of allergens from arthropods such as
dust mites, crustaceans and insects, and more rarely, of allergens from mollusks, nema-
todes, and fungi. All the identied allergens share conserved amino acid sequences and
three-dimensional structures. Accordingly, the allergens of edible insects form clusters
closely related to crustacean, mollusk and nematode clusters into the phylogenetic trees
built up from the sequence alignments. Our computational investigations suggest edi-
ble insects possess a large repertoire of IgE-binding allergens they share with phyloge-
netically related groups of arthropods, mollusks, and nematodes. These cross-reacting
allergens are susceptible to trigger allergic reactions in individuals previously sensitized
to shellsh or mollusks.
Keywords: allergen repertoire, edible insects, shrimps, dust mites, mollusks, IgE-binding
cross-reactivity
© 2017 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons
Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use,
distribution, and reproduction in any medium, provided the original work is properly cited.

1. Introduction
The rapidly expanding world population, which is estimated to reach 9 billion people
on 2040, underlines the urgent need to develop new sources of food proteins as a comple-
ment for the traditionally consumed proteins of plant and animal origin [1–3]. Among the
new sources of food and feed proteins, insect proteins appear as a valuable candidate with
respect to their good nutritional value for humans and animals [4] and their ability to be
produced at a very large industrial scale [5]. However, insect proteins have to be checked
for food and feed security before the launching of any large-scale production [6–9]. In
this respect, both the chemical (heavy metal and pesticide contamination) and biological
safeties including the potential parasitic microbial and parasitic load, and the potential
allergenicity, should be evaluated. Depending on the forthcoming predictable introduc-
tion of edible insect proteins in both the human and cale diets, the potential allergic risk
associated to the consumption of edible insects has been stressed out, due to the occur-
rence in insects of pan-allergens common to arthropods, mollusks, and nematodes [8–10].
To date, however, our knowledge on the diversity of insect allergens remains too limited
to properly address the potential allergic risk associated to entomophagy, especially for
people living in European countries where insect consumption is not a part of their eating
habits. In the present chapter, we report the results of a bioinformatic approach aimed at
lling the gaps in our existing knowledge about the variety of allergens occurring in some
edible insect species.
2. Assessing the complexity of the IgE-binding allergen repertoire of
edible insects
A bioinformatic approach based on the AllergenOnline server (hp://allergenonline.org)
was used for assessing the allergenic character of the putative IgE-binding cross-reactive
allergens of some edible insects. Analysis of the available amino acid sequences of puta-
tive allergens from yellow mealworm (Tenebrio molitor), silkworm (Bombyx mori), house y
maggot (Musca domestica), migratory locust (Locusta migratoria), house cricket (Acheta domes-
ticus), grater wax moth (Galleria mellonella), black soldier y (Hermetia illucens), American
grasshopper (Schistocerca americana), and Indian mealmoth (Plodia interpunctella) was per-
formed using two large (80 amino acid residues) and restricted (8 amino acid residues)
sliding windows, respectively. Positive hits from the AllergenOnline data bank correspond
to allergens exhibiting >35% identity over an 80-residue window and 100% identity over an
8-residue window, respectively. The FASTA search algorithm (FASTA 35.04, 2009) was used
with the standard E-value cuto of 1. For each assayed putative insect allergen, the number
of positive hits for both the global (80mer window) and the local (8mer window) identities
is indicated in Table 1.
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Insect Putative allergen (No. hits 80mer) (No. hits 8mer)
Tenebrio molitor Alpha-amylase 6 41
Chitinase 2 0
Cockroach allergen 10 0
Glutathione S-transferase 3 57
HSP 70 7 389
Hexamerin 9 37
Serine protease 11 0
Triosephosphate isomerase 4 132
Bombyx mori Actin 0 0
Alpha-amylase 4 43
Arginine kinase 14 1431
Chitinase 2 3
Glutathione S-transferase 4 24
HSP 70 7 218
Hemocyanin 9 12
Sarcoplasmic Ca-binding protein 4 6
Serine protease 3 0
Triosephosphate isomerase 4 107
Tropomyosin 75 866
Troponin C 12 115
Trypsin 10 0
Beta-tubulin 0 0
Musca domestica Actin 0 0
Alpha-amylase 6 25
Arginine kinase 14 1045
Chitinase 2 0
Glutathione S-transferase 3 9
HSP 70 7 633
Hemocyanin 9 3
Sarcoplasmic Ca-binding protein 0 0
Serine protease 14 6
Triosephosphate isomerase 4 106
Tropomyosin 76 4547
Troponin C 10 19
Trypsin 15 19
Beta-tubulin 0 0
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3. IgE-binding allergens of edible insects belong to conserved
protein families
Bioinformatic investigations using a sliding window of 80 amino acids resulted in a large
number of positive hits for the putative allergen proteins of all the insect species, with the
exception of actin, sarcoplasmic Ca-binding protein (SCBP), and β-tubulin (Table 1). However,
some of the global identities do not necessarily coincide with local identities, since no hit was
found with a more restricted sliding window of eight amino acid residues. Both global and
local identities were found with the thioredoxin allergen of silkworm, house y maggot, and
the Indian mealmoth (P. interpunctella).
Most of the hits found with the 80mer and 8mer windows consist of allergens from arthro-
pods such as dust mites, crustaceans, and insects and, more rarely, of allergens from mol-
lusks, nematodes, and fungi (Alternaria alternata, Aspergillus oryzae, Aspergillus fumigatus,
Cladosporium herbaceum, Malassezia sympodialis) (Table 2). For a limited number of puta-
tive insect allergens like the widely distributed heat shock protein HSP 70, serine protease,
trypsin, triosephosphate isomerase (TPI), and thioredoxin, hit allergens of plant (the blue
cypress Cupressus arizonica, the maize Zea mays, the wheat Triticum aestivum, the common
ragweed Ambrosia artemisiifolia, the olive tree Olea europaea) and animal (the Mozambique
Insect Putative allergen (No. hits 80mer) (No. hits 8mer)
Locusta migratoria Actin 0 0
Arginine kinase 14 1329
Chitinase 2 0
Glutathione S-transferase 3 4
HSP 70 8 602
Hexamerin 9 0
Serine protease 16 13
Tropomyosin 76 5455
Trypsin 16 13
Beta-tubulin 0 0
Acheta domesticus Triosephosphate isomerase 4 27
Galleria mellonella Glutathione S-transferase 3 22
Hemocyanin 9 23
Trypsin 16 12
Hermetia illucens Alpha-amylase 6 56
Serine protease 16 19
Trypsin 16 57
Schisto americana Arginine kinase 14 1383
Table 1. Global (80mer) and local (8mer) identities found for the putative insect allergens.
Future Foods74

tilapia Oreochromis mossambicus, the dog Canis familiaris) origin were identied. Obviously,
these allergens consist of ubiquitous pan-allergens that occur in so distantly phylogenetically
related or phylogenetically unrelated organisms.
Protein family Insects Dust mites Crustaceans Mollusks/Nematodes
Actin – (1) – –
Alpha-amylase Bla g 11 Blo t 4 – –
Per a 11 Der f 4
(+2) Der p 4
Eur m 4 (+2)
Arginine kinase Bomb m 1 Der f 20 Cra c 2 (4)
Per a 9 Der p 20 (+3) Lit v 2
Plo i 1 (+5) Pen m 2 (+23)
Chitinase Per a 12 (+1) Der f 15 (+5) – –
Glutathione Bla g 5 (+1) Blo t 8 – –
S-transferase Der f 8 Asc l 13 (N)
Der p 8 (+6) Asc s 13 (N)
HSP 70 (heat shock
protein)
Aed a 8 (+2) Der f 28 – –
Tyr p 28
Hemocyanin Bla g 3 – (1) –
Per a 3
Hexamerin (6) – – –
Myosin Bla g 8 (+1) Der f 26 Art fr 5 –
Cra c 5 –
Hom a 3
Lit v 3
Pen m 3 (+1)
Sarcoplasmic
Ca-binding protein
Aed a 5 (+2) – Cra c 4 –
Eri s 4
Lit v 4
Mac r 4
Pen m 4
Pon l 4 (+24)
Serine protease Api m 7 Der f 6 – –
Bom t 4 Der p 6
Per a 10 Eur m 1 (+12)
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All the insect allergens identied so far consist of proteins which belong to families of
highly conserved proteins, namely, muscle proteins such as tropomyosin, myosin, and the
sarcoplasmic Ca-binding protein and enzymes such as α-amylase, chitinase, glutathione
S-transferase (GST), arginine kinase, serine protease, and trypsin. Most of these proteins have
been already identied as allergens of both the German (Blaella germanica) and American
cockroach (Periplaneta americana) (hp://Allergome.org). According to the high degree of con-
servation, all of these allergens are distributed among phylogenetically related clusters in
Protein family Insects Dust mites Crustaceans Mollusks/Nematodes
Triosephosphate
isomerase
Pol d 4
Pol e 4 (+14)
Tropomyosin (2) Der f 25 Arc s 8, Cra c 8 –
Aed a 10 Blo t 10 Cha f 1 Ani s 3 (N)
Bla g 7 Cho a 10 Cra c 1 Asc l 3 (N)
Chi k 10 Der f 10 Hom a 1 Hel as 1 (+50)
Lep s 1 Der p 10 Lit v 1
Per a 7 (+29) Lep d 10 Mac r 1
Tyr p 10 (+11) Mel l 1
Met e 1
Pan s 1
Pen a 1
Pen m 1
Por p 1 (+54)
Troponin C Bla g 6, Per a 6 Tyr p 34 Cra c 6
Hom a 6 (1 N)
Pen m 6 (+2)
Trypsin (4) Blo t 3 – –
Der f 3
Der p 3
Eur m 3
Tyr p 3 (+3)
Alpha-tubulin – Der f 33 (+2) – –
The Internaional Union of Immunological Societies (IUIS) nomenclature (the three rst initial of the genus name,
followed by the initial of the species name, followed by a number indicating the ranking of discover, e.g., Lit v 2 for
the shrimp Litopenaeus vannamei 2 allergen) was used. Allergens referenced by IUIS (2016) are indicated; numbers into
brackets represent other allergens nonreferenced by IUIS but included into the AllergenOnline data bank.
Table 2. Nomenclature of the IgE-binding allergens belonging to the main allergenic protein families identied in
insects, dust mites, crustaceans, mollusks, and nematodes (N) .
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the phylogenetic trees built up from their amino acid sequence alignments. As an example,
Figure 1 illustrates the phylogenetic tree built up from the glutathione S-transferase multiple
alignment. Very similar trees were built up from the multiple alignments of other enzyme
allergens from edible insects, crustaceans, mollusks, and nematodes (results not shown),
except for the tropomyosin tree, in which insect tropomyosins cluster in two separate groups
Figure 1. Phylogenetic tree built up from the amino acid sequence alignment of glutathione S-transferase allergens of
dust mites, insects, crustaceans, mollusks, and nematodes. Clusters corresponding to dust mites, insects, crustaceans,
mollusks, and nematodes are dierently shaded.
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that are dierently phylogenetically related to the dust mite tropomyosin cluster [11]. This
discrepancy observed in the distribution of insect tropomyosins is consistent with the fact
that some of the dust mite tropomyosin-reactive patient sera strongly interacted with a tropo-
myosin-containing mealworm extract in western blot experiments, whereas other dust mite
tropomyosin-reactive patient sera did not react at all [11].
3.1. Muscle proteins
The muscle proteins tropomyosin, myosin, and sarcoplasmic Ca-binding protein (SCBP)
have been identied as major allergens of edible insects. Especially, tropomyosin appears as a
major pan-allergen largely distributed among dust mites, insects, crustaceans, mollusks, and
nematodes [12–16]. Major allergens of dust mites, e.g., Aca s 10 from Acarus siro, Blo t 10 from
Blomia tropicalis, Der f 10 and Der p 10 from Dermatophagoides farinae and Dermatophagoides
pteronyssinus, Gly d 10 from Glycyphagus destructor, Ixo sc 10 from the shoulder tick Ixodes
scapularis, and Tyr p 10 from Tyrophagus putrescentiae, consist of tropomyosins (Allergome.
org). Many other tropomyosins consist of the major allergens of insects, e.g., Bla g 7 and Per
a 7 from the cockroaches B. germanica and P. americana, Bomb m 7 from the edible pupa of
B. mori, Aed a 7, and Cul q 7 from the mosquitos Aedes aegypti and Culex quinquefasciatus,
and Chi k 10 from the chironomid Chironomus kiiensis, Dro m 7 from the fruit y Drosophila
melanogaster, Glo m 7 from the tsetse y Glossina morsitans, and Loc m 7 from the edible locust
L. migratoria (Allergome.org). Many crustacean species also contain tropomyosin as a major
muscle allergen, e.g., Cra c 1 from the common shrimp Crangon crangon, Eri s 1 from the crab
Eriocheir sinensis, Hom a 1 from the American lobster Homarus americanus, Lit v 1 and Pen
m 1 from the prawns Litopenaeus vannamei and Penaeus monodon, Nep n 1 from the scampi
Nephrops norvegicus, etc. (Allergome.org). Tropomyosin also occurs as a major allergen in
various mollusks like Cra g 1 from the oyster Crassostrea gigas, Hel a from the snail Helix
aspersa, Hal a 1 from the abalone Haliotis asinina, Lol b 1 from the spear squid Loligo bleekeri,
Myt e 1 from the blue mussel Mytilus edulis, Oct v 1 from Octopus vulgaris, Por t 1 from the
Japanese blue crab Portunus trituberculatus, and Sep of 1 from the common culesh Sepia
ocinalis (Allergome.org). Finally, tropomyosin also consists of the major allergen Ani s 3 of
the nematode Anisakis simplex (hp://Allergome.org).
Other muscle protein allergens like troponin and the sarcoplasmic Ca-binding protein
(SCBP) also provide a number of allergens like the troponins Tyr p 24 from the dust mite
T. putrescentiae, Bla g 6 and Per a 6 from the cockroaches B. germanica and P. americana, Cra c 6
and Pen m 6 from the shrimps C. crangon and P. monodon, Hom a 6 from the American lobster
H. americanus, and the troponin of the nematode A. simplex (Allergome.org). The sarcoplas-
mic Ca-binding protein also occurs as an allergen in insects (Aed a 4 and Cul q 4 from the
mosquitos Aedes aegypti and C. quinquefasciatus) and crustaceans (Cra c 4 from C. crangon, Eri
s 4 from the Chinese crab E. sinensis, Hom a 4 from the lobster H. americanus, Mac r 4 from the
giant freshwater prawn Macrobrachium rosenbergii, Pen m 4 from P. monodon, Scy pa 4 from
the green mud crab Scylla paramamosain) (Allergome.org). To date, no SCBP has been identi-
ed as an allergen in mollusks and nematodes.
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All of these muscle protein allergens display a rather high resistance to both the proteolysis
and heat denaturation, as exemplied by the experiments performed on the tropomyosin of
dierent species of mealworm [17] and the oyster Crassostrea gigas [18].
3.2. Enzymes
A number of enzymes including hydrolases like α-amylase, chitinase, serine protease, and
trypsin and metabolic enzymes like arginine kinase (AK), glutathione S-transferase (GST),
and triosephosphate isomerase (TPI) have been identied as cross-reacting allergens of edible
insects [11, 19–23].
Arginine kinase has been previously identied as a pan-allergen widely distributed in vari-
ous insects such as the yellow mealworm (T. molitor) [20], the eld cricket (Gryllus bimaculatus)
[23], and the house cricket (A. domesticus) [11]; shrimps like the black tiger prawn (P. monodon)
and the king prawn (Penaeus latisulcatus) [24]; the giant freshwater prawn (M. rosenbergii) [23,
25]; and crabs like the blue swimming crab (Portunus pelagicus) [26] and the red crab (c) [27].
Arginine kinases consist of the major allergens Bla g 9 of the German cockroach (B. germanica)
and Per a 9 of the American cockroach (P. americana) (Allergome.org). Many other allergens
of dust mites like Blo t 20 of B. tropicalis, Der f 20 of D. farinae, Der p 20 of D. pteronyssinus, and
Gly d 20 of G. destructor also consist of arginine kinases (Allergome.org). The list of arginine
kinase allergens of crustaceans is also consistent (hp://Allergome.org).
Alpha-amylase, a hydrolase of paramount importance for the digestion of starch by herbivo-
rous and omnivorous organisms, occurs as an allergens in dust mites (Aca s 4 of A. siro, Blo t 4
of B. tropicalis, Der p 4 of D. pteronyssinus, Eur m 4 of Euroglyphus maynei, Tyr p 4 of T. putres-
centiae) and insects (Sim v 3 and Sim v 4 of the striped black y Simulia viata, Bla g 11 and
Per a 11 of the cockroaches B. germanica and P. americana) (hp://Allergome.org).
Other metabolic enzymes like the glutathione S-transferase GST (Aca s 8 of A. siro, Blo t 8 of B. tropi-
calis, Der f 8 and Der p 8 of D. farinae and D. pteronyssinus, Tyr p 8 of Tyroglyphus putrescentiae, Bla g 5
and Per a 5 of B. germanica and P. americana), chitinase (Blo t 15 of B. tropicalis, Der f 15 and Der p 15 of
D. farinae and D. pteronyssinus, and Per a 12 of the cockroach P. americana), and triosephosphate isom-
erase TPI (Der f 25 of D. farinae, Bla g TPI of the cockroach B. germanica, For t TPI of the biting midge
Forcipomyia taiwana, and Cra c 8 of the shrimp C. crangon) also consist of allergens essentially in dust
mites and insects (Allergome.org). However, they seem to be less widely distributed in arthropods
than other enzymes like arginine kinase.
3.3. Other proteins
Other proteins involved in metabolic pathways (HSP70, thioredoxin) or displaying struc-
tural (tubulin) or physiological (hemocyanin and hexamerin) functions also occur as minor
allergens in edible insects (Table 2). The hemolymph proteins hemocyanin and hexamerin
both consist of homotetrameric proteins of high molecular mass, which share very conserved
amino acid sequences and three-dimensional conformations. Hexamerin is widely distributed
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Figure 2. (A) Superimposition of the three-dimensional ribbon diagrams of α-amylase allergens of Bombyx mori,
Hermetia illucens, Musca domestica and Apis mellifera. (B) Superimposition of the three- dimensional ribbon diagrams of
arginine kinase allergens of Bombyx mori, Locusta migratoria, Musca domestica, Apis mellifera and Schistocerca americana.
(C) Superimposition of the three-dimensional ribbon diagrams of glutathione S-transferase allergens of Tenebrio molitor,
Locusta migratoria, Galleria mellonella, Musca domestica and Apis mellifera. (D) Superimposition of the three-dimensional
ribbon diagrams of trypsin allergens of Bombyx mori, Galleria mellonella, Hermetia illucens, Locusta migratoria and Musca
domestica. (E) Superimposition of the three-dimensional ribbon diagrams of hexamerin allergens of Bombyx mori,
Locusta migratoria, Galleria mellonella, Tenebrio molitor and Schistocerca americana.
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among insects and crustaceans, and it has been identied as an allergen of the y maggot [28].
The hemolymph protein hemocyanin has been identied as an allergen of the German cock-
roach (Bla g 3) and American cockroach (Per a 3) and of the giant freshwater prawn M. rosen-
bergii as well (Allergome.org).
Owing to the conserved character, all the IgE-binding cross-reacting allergens of edible insects share
very similar and readily superposable three-dimensional conformations. These structural similari-
ties are illustrated in Figure 2, which shows the nice superposition of α-amylase, arginine kinase,
glutathione S-transferase, trypsin, and hexamerin models of dierent origins. In fact, as shown for
most of the members in dierent groups of evolutionary-related proteins, the three-dimensional
conformations are much more conserved than the corresponding amino acid sequences.
4. Resistance of the insect allergens to proteolysis by digestive enzymes
Resistance to proteolysis consists of a property of paramount importance for food allergens,
allowing them to escape the proteolytic degradation along the digestive tract and, thus, pre-
serving their ability to stimulate the peripheral lymph nodes, e.g., Peyer’s patches, associated
with the intestinal tract. In this respect, all of the putative insect allergenic enzymes such as
α-amylase, arginine kinase, glutathione S-transferase, and trypsin exhibit a number of pre-
dicted cleavage sites by pepsin and trypsin distributed along their polypeptide chain and,
especially, exposed on their molecular surface (Figure 3). Accordingly, the multiple proteoly-
sis of all of these enzymes by pepsin, trypsin, and chymotrypsin generate a number of amino
acids and short peptides apparently devoid of ecient IgE-binding properties (Figure 3).
However, a limited number of peptides would keep a sucient size (>10 amino acid resi-
dues), to properly stimulate the digestive immune system. In this respect, the allergenicity
of tropomyosin, myosin, α-amylase, and hexamerin from the yellow mealworm (T. molitor),
the giant mealworm beetle (Zophobas atratus), and the lier beetle (Alphitobius diaperinus) was
reduced but not abolished following both in vitro simulated gastric uid (SGF) and in vitro
simulated intestinal uid (SIF) digestion and heat treatment [17, 29]. The heat resistance of
the major allergens of edible insects implies that both cooked insects and insect protein-con-
taining food products retain some intact allergenicity. Heat and proteolysis stability of tropo-
myosin from the mud crab (Scylla serrata) [30] and the tropical oyster Crassostrea belcheri [18]
have been similarly pointed out.
5. What extent for the allergy to edible insects?
To date, only a few cases of allergenic manifestations caused by the consumption of edible
insects have been reported in the literature. The rst case reports deal with occupational
allergies of particularly exposed environmental searchers, shers, and food industry work-
ers [21, 28, 31–37]. Similarly, the well-known “pancake syndrome” (oral mite anaphylaxis),
caused by the unintended consumption of mite-contaminated foods, has been identied in
Refs. [38, 39]. Interestingly, most or less severe cases of anaphylaxis caused by the ingestion
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of various edible insects, reported in Chinese journals [40–51], were collated by Ji et al. [52],
who counted up to 358 episodes of anaphylactic shock caused by food ingestion from 1980
to 2007. The most common oending allergens were identied as pineapple (25%), the soft-
shelled turtle (Trionychidae) (19%), crabs (9%), and edible insects (locust + grasshopper)
Figure 3. Size (number of amino acid residues) diagram of the peptides resulting from the predicted multiple proteolysis
by pepsin, trypsin, and chymotrypsin of α-amylase of Tenebrio molitor, arginine kinase of Bombyx mori, glutathione
S-transferase of Galleria mellonella, and trypsin from Locusta migratoria. Peptides of ≥10 amino acid residues in length are
indicated by stars (★). Overlay images showing the localization of the predicted cleavage sites by pepsin (pale grey) and
trypsin (deep grey) on the molecular surface of the corresponding allergens are presented.
Future Foods82

(14%). Other cases of anaphylaxis caused by the ingestion of edible insects were subse-
quently reported, mainly in Asia [53–55]. More recently, a majority of shrimp-allergic people
(13 over 15) were conrmed as being allergic to yellow mealworm (T. molitor) when tested in
double-blind, placebo-controlled food challenge (DBPCFC) [56]. In this respect, yellow meal-
worm appears as a food at least as allergenic as shrimps to trigger anaphylactic responses in
shrimp-allergic patients.
The limited number of reported cases of anaphylaxis due to edible insect consumption seems
to be largely underestimated, especially in countries like China, where a great variety of
insects are traditionally consumed as a source of dietary proteins. The occurrence in all of
the edible insects of IgE-binding allergens which cross-react with the major allergens tropo-
myosin and arginine kinase of shrimps, dust mites, mollusks, and even nematodes suggests
that shrimp-allergic and mollusk-allergic patients are at risk when consuming edible insects
or insect-containing food products. However, further large-scale investigations among a
broad population of shrimp- and mollusk-allergic patients will be necessary to appreciate the
real allergenic risk edible insects pose to previously sensitized individuals. In the meantime,
it would be wise to inform the consumers for such a potential risk, e.g., by a proper labeling
of insect foods and insect-containing food products.
6. Conclusion
Obviously, the repertoire of food allergens from edible insects consists of a number of
IgE-binding cross-reactive allergens common to other arthropods, e.g., dust mites and
crustaceans, mollusks, and, more scarcely, nematodes. These pan-allergens refer to muscle
proteins, enzymes, and proteins with structural and physiological functions. However, the
search of identities the insect proteins share with known allergens of the allergen bank as a
criterion for identifying allergens of edible insects suers from some limitations associated
to the completeness and quality of the bank. Most of the allergenic proteins of animal or
plant origin essentially belong to abundant and widespread protein families in both animal
and plant species like tropomyosins, lipocalins, and caseins for animals and cupins, prol-
ins, and prolamins for plants [57]. Moreover, depending on the data bank used for searching
the identities with known allergens, the accuracy and exhaustiveness of the results might
vary considerably. In this respect, the continuously updated FARRP AllergenOnline bank
oers a maximum of guarantee for the retrieved information [58]. Accordingly, all of the
allergens identied to date correspond to proteins already known for their allergenic prop-
erties. Other allergens more specic of insects remain to be identied and characterized, in
order to have a more accurate idea about the variability and specicity of the edible insect
allergens. A serological approach using IgE-containing sera from allergic patients will be
necessary to fulll such a requirement, instead of the computational approach reported in
this chapter. As insect food could be so allergenic that it can trigger strong anaphylactic
responses in allergic persons, it is recommended that all insect food and insect-containing
food products should mention this allergy possibility very clearly in the product labels.
Allergy to Edible Insects: A Computational Identification of the IgE-Binding Cross-Reacting...
http://dx.doi.org/10.5772/68124
83

Author details
Pierre Rougé* and Annick Barre
*Address all correspondence to: pierre.rouge@free.fr
University Paul Sabatier – Tolouse 3, Research Institute for Development, Research Unit 152
Pharma-Dev, Faculty of Pharmacy, Toulouse, France
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