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- W2753529130 abstract "Aim Studies on gestational diabetes (GDM) have highlighted the induction of genes involved in the immune response, particularly those associated with inflammation. HLA-C, HLA-E and HLA-G are the only HLA genes expressed on trophoblast cells, playing an important role in the modulation of the maternal immune response against the fetus. Considering that: (i) there is a similar transcriptional profile between GDM and the autoimmune type 1 diabetes mellitus; and (ii) some allelic combinations between KIR and HLA genes, mainly HLA-C, are strongly associated with pre-eclampsia and recurrent miscarriage, we investigated the possible role of HLA-C, -E and -G variability in GDM. Methods We evaluated 102 GDM and 150 non-GDM women to detect HLA-C, -E and -G polymorphisms and haplotypes considering the entire gene segment, including the promoter, coding sequence and 3’untranslated region (3’UTR), by using next generation sequencing and a local bioinformatics strategy to get reliable genotypes and haplotypes. Results We observed 14 allelic groups when the HLA-C gene was evaluated, and two of them (HLA-C∗05, mainly represented by the C∗05:01:01, and HLA-C∗08, mainly represented by the allele C∗08:02:01) were associated with protection against GDM (P = 0.0376, OR = 0.3450 and P = 0.0184, OR = 0.2894 respectively). An HLA-C promoter region here named P09 and a 3’UTR here named U09 are strongly associated with protection against GDM (P = 0.0376 OR = 0.3450). These regulatory haplotypes are in fact shared by all C∗05 and C∗08 alleles here detected, suggesting that the protective feature against GDM could be associated with some trait of these specific regulatory regions or associated with the C∗05 or C∗08 allele groups or both. The HLA-E∗01:03:05 allele, originally described in a Brazilian population, was observed only in controls, indicating a protection role for GDM (P = 0.033 and OR = 0.1343). No associations were observed for the HLA-G, considering allele, coding region, promoter, 3’UTR or extended haplotype. Conclusions Only HLA-C and HLA-E were associated with GDM, by mechanisms yet to be understood and explored. The study of other HLA genes, as well as the transcription profiles observed in GDM patients, may increase the understanding of the role of these genes in the pathogenesis of GDM." @default.
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- W2753529130 date "2017-09-01" @default.
- W2753529130 modified "2023-10-18" @default.
- W2753529130 title "P014 HLA-C, HLA-E and HLA-G regulatory and coding region polymorphisms in patients exhibiting gestational diabetes mellitus" @default.
- W2753529130 doi "https://doi.org/10.1016/j.humimm.2017.06.074" @default.
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