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Rolim I, Duarte N, Barata G, Costa J, Gardete-Correia L, Boavida J, Duarte R, Raposo J, Peerally Z, Catarino M, Penha-Gonçalves C. Immunoglobulin M gene association with autoantibody reactivity and type 1 diabetes. Immunogenetics 2017; 69:429-437. [PMID: 28534223 PMCID: PMC5486809 DOI: 10.1007/s00251-017-0999-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 05/04/2017] [Indexed: 01/07/2023]
Abstract
Several lines of evidence show that autoimmune responses evolving in type 1 diabetes (T1D) patients include the generation of multi-reactive autoantibody (AutoAb) repertoires, but their role in T1D pathogenesis remains elusive. We tested the hypothesis that variants at the immunoglobulin heavy chain (IGH) locus are genetic determinants of AutoAbs against pancreatic antigens and contribute to T1D susceptibility. With this aim, two independent study designs were used: a case-control study and a family-based cohort comprising a total of 240 T1D patients, 172 first-degree relatives (mother and/or father), and 130 unrelated healthy controls living in Portugal. We found that three SNPs in the IGH locus show suggestive association with T1D with the highest nominal association at rs1950942 (in the IGHM-IGHJ gene region) in both the case-control study (P = 9.35E-03) and the family-based cohort (P = 3.08E-03). These SNPs were also associated with IgG AutoAbs against pancreatic antigens and with AutoAb multi-reactivity in T1D patients. Notably, we found that the SNP with the highest association with T1D susceptibility and IgG autoantibody reactivity (rs1950942) was also associated with anti-GAD IgM reactivity in T1D patients (P = 5.98E-03) and in non-affected parents (P = 4.17E-03). This finding implies that IGH association with autoreactive IgM is detectable irrespective of disease status.These results suggest that genetic variants at the IgM gene region of the IGH locus contribute to antibody autoreactivity and are associated with T1D. We propose that the control of autoantibody generation by IGH polymorphisms is a component of the complex architecture of T1D genetic susceptibility.
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Affiliation(s)
- Inês Rolim
- Instituto Gulbenkian de Ciência, Apartado 14, P-2781-901, Oeiras, Portugal.,Faculdade de Farmácia, Universidade de Lisboa, Lisbon, Portugal
| | - Nádia Duarte
- Instituto Gulbenkian de Ciência, Apartado 14, P-2781-901, Oeiras, Portugal
| | - Gabriela Barata
- Faculdade de Farmácia, Universidade de Lisboa, Lisbon, Portugal.,Portuguese Diabetes Association, Education and Research Center, Lisbon, Portugal
| | - João Costa
- Instituto Gulbenkian de Ciência, Apartado 14, P-2781-901, Oeiras, Portugal
| | - Luís Gardete-Correia
- Portuguese Diabetes Association, Education and Research Center, Lisbon, Portugal
| | - José Boavida
- Portuguese Diabetes Association, Education and Research Center, Lisbon, Portugal
| | - Rui Duarte
- Portuguese Diabetes Association, Education and Research Center, Lisbon, Portugal
| | - João Raposo
- Portuguese Diabetes Association, Education and Research Center, Lisbon, Portugal
| | - Zulmira Peerally
- Portuguese Diabetes Association, Education and Research Center, Lisbon, Portugal
| | | | - Carlos Penha-Gonçalves
- Instituto Gulbenkian de Ciência, Apartado 14, P-2781-901, Oeiras, Portugal. .,Portuguese Diabetes Association, Education and Research Center, Lisbon, Portugal.
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Parada H, Veríssimo C, Brandão J, Nunes B, Boavida J, Duarte R, Peerally Z, Oliveira R, Rosado L, Sabino R. Dermatomycosis in lower limbs of diabetic patients followed by podiatry consultation. Rev Iberoam Micol 2012; 30:103-8. [PMID: 23147514 DOI: 10.1016/j.riam.2012.09.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2012] [Revised: 09/10/2012] [Accepted: 09/28/2012] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Diabetic patients are particularly susceptible to fungal infections due to modifications that occur in their immunological system. These modifications compromise natural defences, such as skin and nails, especially from lower limbs. AIMS Assessing the presence of dermatomycosis in lower limbs of Portuguese diabetic patients followed on Podiatry consultation. Determination of possible predisposing factors and the most frequent fungal species associated with the cases are included in the study. METHODS A six-month prospective study was carried out in 163 diabetic patients with signs and symptoms of dermatomycosis followed by Podiatry at the Portuguese Diabetes Association in Lisbon. Samples from the skin and/or nails of the lower limbs were collected and demographic and clinical data of those patients were recorded. RESULTS Trichophyton rubrum was the most frequently isolated dermatophyte (12.1%), followed by Trichophyton mentagrophytes (7.7%) and Trichophyton tonsurans (4.4%). Our study showed positive associations between type 2 diabetes and the presence of dermatomycosis in the studied population (p=0.013); this association was also shown between the occurrence of dermatomycosis and the localization of the body lesion (p=0.000). No other predisposing factor tested was positively associated with infection (p>0.05). CONCLUSIONS Data on superficial fungal infections in diabetic patients are scarce in Portugal. This study provides information on the characterization of dermatomycosis in lower limbs of diabetic patients.
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Affiliation(s)
- Helena Parada
- URSZ - Infectious Diseases Department, National Institute of Health Dr. Ricardo Jorge, Lisbon, Portugal
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