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Hubert J, Vrtala S, Sopko B, Dowd SE, He Q, Klimov PB, Harant K, Talacko P, Erban T. Predicting Blomia tropicalis allergens using a multiomics approach. Clin Transl Allergy 2023; 13:e12302. [PMID: 37876035 PMCID: PMC10542617 DOI: 10.1002/clt2.12302] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 08/01/2023] [Accepted: 09/07/2023] [Indexed: 10/26/2023] Open
Abstract
BACKGROUND The domestic mite Blomia tropicalis is a major source of allergens in tropical and subtropical regions. Despite its great medical importance, the allergome of this mite has not been sufficiently studied. Only 14 allergen groups have been identified in B. tropicalis thus far, even though early radioimmunoelectrophoresis techniques (27 uncharacterized allergen complexes) and comparative data based on 40 allergen groups officially recognized by the World Health Organization (WHO)/IUIS in domestic astigmatid mites suggest the presence of a large set of additional allergens. METHODS Here, we employ a multiomics approach to assess the allergome of B. tropicalis using genomic and transcriptomic sequence data and perform highly sensitive protein abundance quantification. FINDINGS Among the 14 known allergen groups, we confirmed 13 (one WHO/IUIS allergen, Blo t 19, was not found) and identified 16 potentially novel allergens based on sequence similarity. These data indicate that B. tropicalis shares 27 known/deduced allergen groups with pyroglyphid house dust mites (genus Dermatophagoides). Among these groups, five allergen-encoding genes are highly expressed at the transcript level: Blo t 1, Blo t 5, Blo t 21 (known), Blo t 15, and Blo t 18 (predicted). However, at the protein level, a different set of most abundant allergens was found: Blo t 2, 10, 11, 20 and 21 (mite bodies) or Blo t 3, 4, 6 and predicted Blo t 13, 14 and 36 (mite feces). INTERPRETATION We report the use of an integrated omics method to identify and predict an array of mite allergens and advanced, label-free proteomics to determine allergen protein abundance. Our research identifies a large set of novel putative allergens and shows that the expression levels of allergen-encoding genes may not be strictly correlated with the actual allergenic protein abundance in mite bodies.
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Affiliation(s)
- Jan Hubert
- Crop Research InstitutePragueCzechia
- Department of Microbiology, Nutrition and DieteticsFaculty of Agrobiology, Food and Natural ResourcesCzech University of Life Sciences PraguePragueCzechia
| | - Susanne Vrtala
- Department of Pathophysiology and Allergy ResearchCenter for Pathophysiology, Infectiology and ImmunologyMedical University of ViennaViennaAustria
| | | | - Scot E. Dowd
- MR DNA (Molecular Research LP)ShallowaterTexasUSA
| | - Qixin He
- Purdue UniversityLilly Hall of Life SciencesWest LafayetteIndianaUSA
| | - Pavel B. Klimov
- Purdue UniversityLilly Hall of Life SciencesWest LafayetteIndianaUSA
| | - Karel Harant
- Proteomics Core FacilityFaculty of ScienceCharles UniversityBIOCEVVestecCzechia
- Institute for Environmental StudiesFaculty of ScienceCharles UniversityPragueCzechia
| | - Pavel Talacko
- Proteomics Core FacilityFaculty of ScienceCharles UniversityBIOCEVVestecCzechia
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Cai ZL, Liu S, Li WY, Zhou ZW, Hu WZ, Chen JJ, Ji K. Identification of an immunodominant IgE epitope of Der f 40, a novel allergen of Dermatophagoides farinae. World Allergy Organ J 2023; 16:100804. [PMID: 37577028 PMCID: PMC10415791 DOI: 10.1016/j.waojou.2023.100804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 06/02/2023] [Accepted: 07/19/2023] [Indexed: 08/15/2023] Open
Abstract
Background House dust mites (HDMs), including Dermatophagoides pteronyssinus (Der p) and Dermatophagoides farinae (Der f) species, represent a major source of inhalant allergens that induce IgE-mediated anaphylactic reactions. HDM allergen identification is important to the diagnosis and treatment of allergic diseases. Here, we report the identification of a novel HDM allergen, which we suggest naming Der f 40, and its immunodominant IgE epitopes. Methods The recombinant protein Der f 40 was expressed using a pET prokaryotic expression system and purified with Ni-NTA resins. IgE binding activity was evaluated by IgE-western blot, dot-blot, and ELISA. Mast cell activation testing was performed to assess the cellular effects of IgE binding in mouse bone marrow derived mast cells (BMMCs) expressing human FcεRI. IgE binding assays were performed with truncated and hybrid Der f 40 protein molecules to find immunodominant IgE epitopes. Results A 106-amino acid (aa) recombinant Der f Group 40 protein (rDer f 40) was obtained (GenBank accession No. XP_046915420.1) as thiredoxin-like protein. Der f 40 was shown to bind IgE from HDM allergic serum in vitro (9.68%; 12/124 in IgE-ELISA), and shown to promote the release of β-hexosaminidase from BMMCs dose-dependently when administered with HDM allergic sera. The Der f Group 40 protein was named Der f 40 and listed in the World Health Organization and International Union of Immunological Societies (WHO/IUIS) Allergen Nomenclature Sub-committee. IgE binding assays with Der f 40-based truncated and hybrid proteins indicated that IgE binding epitopes are likely located in the C-terminal region and dependent on conformational structure. The 76-106-aa region of C-terminus was identified as an immunodominant IgE epitope of Der f 40. Conclusion A novel HDM allergen with robust IgE binding activity was identified and named Der f 40. An immunodominant IgE epitope of Der f 40 with conformational dependency was identified in the C-terminus (aa 76-106). These findings provide new information that may be useful in the development of diagnostic and therapeutic agents for HDM allergy.
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Affiliation(s)
- Ze-Lang Cai
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Shenzhen University Medical School, Shenzhen 518060, China
| | - Shan Liu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Shenzhen University Medical School, Shenzhen 518060, China
| | - Wei-Yong Li
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Shenzhen University Medical School, Shenzhen 518060, China
| | - Zi-Wen Zhou
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Shenzhen University Medical School, Shenzhen 518060, China
| | - Wan-Zhen Hu
- Shenzhen University General Hospital, Shenzhen 518060, China
| | - Jia-Jie Chen
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Shenzhen University Medical School, Shenzhen 518060, China
| | - Kunmei Ji
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Shenzhen University Medical School, Shenzhen 518060, China
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Gao Y, Li J, Xu X, Wang C, Zhang Y, Zhang L. Sensitisation to House Dust Mite Component Der p 23 Is Associated with Severe Symptoms and Asthma in Allergic Rhinitis Patients. Int Arch Allergy Immunol 2023; 184:906-913. [PMID: 37437556 DOI: 10.1159/000531244] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 05/12/2023] [Indexed: 07/14/2023] Open
Abstract
INTRODUCTION House dust mite (HDM) is an important source of airborne allergens in China as it contains several allergenic components that can cause allergic rhinitis (AR) and other allergic diseases. This study aimed to determine the clinical characteristics and disease severity in AR patients sensitised to different allergenic HDM components. METHODS This was a retrospective study, which examined 129 patients who were first diagnosed with only HDM-induced AR at the Department of Allergy of Beijing Tongren Hospital from December 2019 to April 2021. Clinical characteristics and disease severity of the patients were assessed based on the sensitisation to specific Dermatophagoides pteronyssinus (Der p) and Dermatophagoides farinae (Der f) allergenic components, including Der p 1, Der p 2, Der p 23, Der f 1, and Der f 2, employing multiple correspondence analysis (MCA) with correspondence analysis chart of MCA. RESULTS Among HDM-induced AR cases, the positive rate of Der p 1 was the highest (87.6%), followed by Der p 2 (78.3%), Der f 2 (76.64%), Der f 1 (68.2%), and Der p 23 (37.2%). Multiple correspondence analyses showed that sensitisation to Der p 23 was associated with severe AR symptoms and asthma; sensitisation to Der p 2, Der f 1, and Der f 2 was associated with moderate AR; and no sensitisation to Der p 23 was associated with mild AR. CONCLUSION Der p 23 sensitisation is prevalent in northern China and may be associated with severe symptoms and asthma in AR patients.
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Affiliation(s)
- Yunbo Gao
- Department of Allergy, Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Jingyun Li
- Department of Allergy, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Laboratory of Allergic Diseases and Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, Beijing, China
- Department of Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, Beijing, China
| | - Xu Xu
- Department of Allergy, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Laboratory of Allergic Diseases and Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, Beijing, China
- Department of Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, Beijing, China
| | - Chengshuo Wang
- Beijing Laboratory of Allergic Diseases and Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, Beijing, China
- Department of Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Yuan Zhang
- Department of Allergy, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Laboratory of Allergic Diseases and Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, Beijing, China
| | - Luo Zhang
- Department of Allergy, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Laboratory of Allergic Diseases and Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, Beijing, China
- Department of Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
- Beijing Key Laboratory of Nasal Diseases, Beijing Institute of Otolaryngology, Beijing, China
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Chen J, Cai Z, Fan D, Hu J, Hou Y, He Y, Zhang Z, Zhao Z, Gao P, Hu W, Sun J, Li J, Ji K. Chromosome-level assembly of Dermatophagoides farinae genome and transcriptome reveals two novel allergens Der f 37 and Der f 39. World Allergy Organ J 2021; 14:100590. [PMID: 34659625 PMCID: PMC8487952 DOI: 10.1016/j.waojou.2021.100590] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Revised: 09/01/2021] [Accepted: 09/03/2021] [Indexed: 01/06/2023] Open
Abstract
Accurate house dust mite (HDM) genome and transcriptome data would promote our understanding of HDM allergens. We sought to assemble chromosome-level genome and precise transcriptome profiling of Dermatophagoides farinae and identify novel allergens. In this study, genetic material extracted from HDM bodies and eggs were sequenced. Short-reads from next generation sequencing (NGS) and long-reads from PacBio/Nanopore sequencing were used to construct the D. farinae nuclear genome, transcriptome, and mitochondrial genome. The candidate homologs were screened through aligning our assembled transcriptome data with amino acid sequences in the WHO/IUIS database. Our results showed that compared with the D. farinae draft genome, bacterial DNA content in the presently developed sequencing reads was dramatically reduced (from 22.9888% to 1.5585%), genome size was corrected (from 53.55 Mb to 58.77 Mb), and the contig N50 was increased (from 8.54 kb to 9365.49 kb). The assembled genome has 10 contigs with minimal microbial contamination, 33 canonical allergens and 2 novel allergens. Eight homologs (≥50% homology) were cloned; 2 bound HDM allergic-sera and were identified as allergens (Der f 37 and Der f 39). In conclusion, a chromosome-level genome, transcriptome and mitochondrial genome of D. farinae was generated to support allergen identification and development of diagnostics and immunotherapeutic vaccines.
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Affiliation(s)
- Jiajie Chen
- Department of Biochemistry and Molecular Biology, Laboratory Department of Pinghu Hospital, Health Science Center, Shenzhen University, Shenzhen, 518060, China
| | - Zelang Cai
- Department of Biochemistry and Molecular Biology, Laboratory Department of Pinghu Hospital, Health Science Center, Shenzhen University, Shenzhen, 518060, China
| | | | - Jiayu Hu
- Department of Biochemistry and Molecular Biology, Laboratory Department of Pinghu Hospital, Health Science Center, Shenzhen University, Shenzhen, 518060, China
| | - Yibo Hou
- Department of Biochemistry and Molecular Biology, Laboratory Department of Pinghu Hospital, Health Science Center, Shenzhen University, Shenzhen, 518060, China
| | - Yongsen He
- Department of Biochemistry and Molecular Biology, Laboratory Department of Pinghu Hospital, Health Science Center, Shenzhen University, Shenzhen, 518060, China
| | - Zhen Zhang
- Department of Biochemistry and Molecular Biology, Laboratory Department of Pinghu Hospital, Health Science Center, Shenzhen University, Shenzhen, 518060, China
| | - Zhenfu Zhao
- Department of Biochemistry and Molecular Biology, Laboratory Department of Pinghu Hospital, Health Science Center, Shenzhen University, Shenzhen, 518060, China
| | - Pan Gao
- Shenzhen University General Hospital, Shenzhen, 518060, China
| | - Wanzhen Hu
- Shenzhen University General Hospital, Shenzhen, 518060, China
| | - Jinlyu Sun
- Allergy Department, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100730, China
- Corresponding author.
| | - Jiang Li
- EasyATCG L.L.C, Shenzhen, 518000, China
- Corresponding author.
| | - Kunmei Ji
- Department of Biochemistry and Molecular Biology, Laboratory Department of Pinghu Hospital, Health Science Center, Shenzhen University, Shenzhen, 518060, China
- Corresponding author.
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IgE-binding residues analysis of the house dust mite allergen Der p 23. Sci Rep 2021; 11:921. [PMID: 33441720 PMCID: PMC7806929 DOI: 10.1038/s41598-020-79820-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 12/11/2020] [Indexed: 11/24/2022] Open
Abstract
House dust mites (HDMs) are one of the major causes of allergies in the world. The group 23 allergen, Der p 23, from Dermatophagoides pteronyssinus, is a major allergen amongst HDM-sensitized individuals. This study aims to determine the specific immunoglobulin E (sIgE) binding frequency and IgE-binding residues of recombinant Der p 23 (rDer p 23) allergen amongst a cohort of consecutive atopic individuals in a tropical region. We performed site-directed mutagenesis and carried out immuno-dot blot assays using 65 atopic sera. The immuno-dot blot assays results indicated that the two residues K44 and E46 which are located at the N-terminal region are the major IgE-binding residues. The rDerp-23 sIgE titers are strongly correlated to the number of IgE-binding residues for rDer p 23 (P < 0.001). Atopic individuals who were only sensitized to HDM have a significantly higher number of IgE-binding residues than the individuals who were polysensitized to HDM and other crude allergens (P < 0.05). Individuals with allergic multimorbidity and moderate-to-severe allergic rhinitis also have a higher number of IgE-binding residues compared to those with single allergic disease and mild allergic rhinitis. The results prompt us to hypothesize that the individuals who have a higher number of IgE-binding residues may face a bigger challenge to be treated through immunotherapy due to the complexity in designing an effective hypoallergen with a high number of IgE-binding residues. We propose that the development of a refined molecular diagnostic assay, which includes alanine substitution of surface-exposed residues could be a more precise diagnostic strategy to identify all the IgE-binding residues of a major allergen for an atopic individual and the development could be another new dimension in allergy diagnosis and allergen immunotherapy treatment.
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