The association of vitamin D binding protein levels and genotypes with type 1 diabetes in the black South African population
Abstract Background Vitamin D deficiency and the vitamin D pathway have previously been associated with type 1 diabetes (T1D). The majority of vitamin D is transported through the blood bound to the vitamin D binding protein (VDBP). Two polymorphisms in the VDBP gene (rs4588 and rs7041) result in di...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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BMC
2022-07-01
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| Series: | BMC Endocrine Disorders |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s12902-022-01097-1 |
| _version_ | 1817969692886695936 |
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| author | Eleanor M Cave Sureka Bhola Nigel J Crowther Carolyn J Padoa |
| author_facet | Eleanor M Cave Sureka Bhola Nigel J Crowther Carolyn J Padoa |
| author_sort | Eleanor M Cave |
| collection | DOAJ |
| description | Abstract Background Vitamin D deficiency and the vitamin D pathway have previously been associated with type 1 diabetes (T1D). The majority of vitamin D is transported through the blood bound to the vitamin D binding protein (VDBP). Two polymorphisms in the VDBP gene (rs4588 and rs7041) result in different VDBP variants and have been associated with T1D, however the results are not consistent. The association of VDBP levels and its polymorphisms with T1D have not been investigated in the black South African population. Therefore, this study aimed to determine whether rs4588, rs7041 or serum VDBP levels were associated with T1D in this population. Methods Participants with type 1 diabetes and controls were recruited from the greater Johannesburg area, South Africa. Participants were genotyped for rs4588 and rs7041 using PCR-RFLP and serum VDBP levels were determined by ELISA. Results There was no difference in VDBP allelic or genotypic frequencies between participants with T1D and controls (rs4588 C allele frequency 0.92 vs. 0.94; p = 0.390 and rs7041 T allele frequency 0.95 vs. 0.95; p = 0.890). In univariate analysis, the rs4588 CC genotype was associated with increased serum VDBP levels, however, this association was lost with multivariate analysis. The VDBP genotypes were not associated with any other study variables. In logistic regression analysis, higher VBDP levels were associated with T1D (OR: (95% CI): 6.58 (1.45–29.9); p = 0.015), and within a linear regression analysis, T1D disease status was found to be associated with 0.044 mg/ml higher VDBP levels (p = 0.028). Conclusions These data suggest that serum VDBP levels are positively associated with the presence of T1D in the African population. Whether VDBP lies in the causal pathway or its elevation is an effect of T1D is uncertain and requires further investigation. |
| first_indexed | 2024-04-13T20:24:24Z |
| format | Article |
| id | doaj.art-125692aebbbd402a8bdd477a77f93023 |
| institution | Directory Open Access Journal |
| issn | 1472-6823 |
| language | English |
| last_indexed | 2024-04-13T20:24:24Z |
| publishDate | 2022-07-01 |
| publisher | BMC |
| record_format | Article |
| series | BMC Endocrine Disorders |
| spelling | doaj.art-125692aebbbd402a8bdd477a77f930232022-12-22T02:31:25ZengBMCBMC Endocrine Disorders1472-68232022-07-012211810.1186/s12902-022-01097-1The association of vitamin D binding protein levels and genotypes with type 1 diabetes in the black South African populationEleanor M Cave0Sureka Bhola1Nigel J Crowther2Carolyn J Padoa3Department of Chemical Pathology, Faculty of Health Sciences, University of the WitwatersrandDepartment of Chemical Pathology, Faculty of Health Sciences, University of the WitwatersrandDepartment of Chemical Pathology, Faculty of Health Sciences, University of the WitwatersrandDepartment of Chemical Pathology, Faculty of Health Sciences, University of the WitwatersrandAbstract Background Vitamin D deficiency and the vitamin D pathway have previously been associated with type 1 diabetes (T1D). The majority of vitamin D is transported through the blood bound to the vitamin D binding protein (VDBP). Two polymorphisms in the VDBP gene (rs4588 and rs7041) result in different VDBP variants and have been associated with T1D, however the results are not consistent. The association of VDBP levels and its polymorphisms with T1D have not been investigated in the black South African population. Therefore, this study aimed to determine whether rs4588, rs7041 or serum VDBP levels were associated with T1D in this population. Methods Participants with type 1 diabetes and controls were recruited from the greater Johannesburg area, South Africa. Participants were genotyped for rs4588 and rs7041 using PCR-RFLP and serum VDBP levels were determined by ELISA. Results There was no difference in VDBP allelic or genotypic frequencies between participants with T1D and controls (rs4588 C allele frequency 0.92 vs. 0.94; p = 0.390 and rs7041 T allele frequency 0.95 vs. 0.95; p = 0.890). In univariate analysis, the rs4588 CC genotype was associated with increased serum VDBP levels, however, this association was lost with multivariate analysis. The VDBP genotypes were not associated with any other study variables. In logistic regression analysis, higher VBDP levels were associated with T1D (OR: (95% CI): 6.58 (1.45–29.9); p = 0.015), and within a linear regression analysis, T1D disease status was found to be associated with 0.044 mg/ml higher VDBP levels (p = 0.028). Conclusions These data suggest that serum VDBP levels are positively associated with the presence of T1D in the African population. Whether VDBP lies in the causal pathway or its elevation is an effect of T1D is uncertain and requires further investigation.https://doi.org/10.1186/s12902-022-01097-1Type 1 diabetesBlack South AfricanVitamin D binding protein |
| spellingShingle | Eleanor M Cave Sureka Bhola Nigel J Crowther Carolyn J Padoa The association of vitamin D binding protein levels and genotypes with type 1 diabetes in the black South African population BMC Endocrine Disorders Type 1 diabetes Black South African Vitamin D binding protein |
| title | The association of vitamin D binding protein levels and genotypes with type 1 diabetes in the black South African population |
| title_full | The association of vitamin D binding protein levels and genotypes with type 1 diabetes in the black South African population |
| title_fullStr | The association of vitamin D binding protein levels and genotypes with type 1 diabetes in the black South African population |
| title_full_unstemmed | The association of vitamin D binding protein levels and genotypes with type 1 diabetes in the black South African population |
| title_short | The association of vitamin D binding protein levels and genotypes with type 1 diabetes in the black South African population |
| title_sort | association of vitamin d binding protein levels and genotypes with type 1 diabetes in the black south african population |
| topic | Type 1 diabetes Black South African Vitamin D binding protein |
| url | https://doi.org/10.1186/s12902-022-01097-1 |
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