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Background: Gestational diabetes mellitus (GDM), a common endocrine disorder with rising prevalence in pregnancy, has been reported to be associated with alteration of gut microbiota in recent years. However, the role of gut microbiome in GDM physiopathology remains unclear. This pilot study aims to characterize the alteration of gut microbiota in GDM on species-level resolution and evaluate the relationship with occurrence of GDM. Methods: An analysis based on 16S rRNA microarray was performed on fecal samples obtained from 30 women with GDM and 28 healthy pregnant women. Results: We found 54 and 141 differentially abundant taxa between GDM and control group at the genus and the species level respectively. Among GDM patients, Peptostreptococcus anaerobius was inversely correlated with fasting glucose while certain species (e.g., Aureimonas altamirensis, Kosakonia cowanii) were positively correlated with fasting glucose. Conclusions: This study suggests that there are large amounts of differentially abundant taxa between GDM and control group at the genus and the species level. Some of these taxa were correlated with blood glucose level and might be used as biomarkers for diagnoses and therapeutic targets for probiotics or synbiotics. [ABSTRACT FROM AUTHOR]

Purpose: We intend to investigate the association between tacrolimus-induced new-onset diabetes after transplantation (NODAT) and polymorphisms of CYP3A4, CYP3A5, ATP-binding cassette transporter sub-family C member 8 (ABCC8), and glucokinase (GCK) in renal transplant recipients.Methods: Polymorphisms of CYP3A4 *18B, CYP3A5 *3, ABCC8 T-3C, and GCK G-30A were genotyped in 169 renal transplant recipients. Trough concentrations of tacrolimus were detected by an ELISA kit. The relative materials were collected in all patients and volunteers. The association of NODAT and polymorphisms was analyzed.Results: CYP3A4 *18B and GCK G-30A were related to NODAT (p < 0.05). The lower concentration/dose or fasting serum glucose was in CYP3A4 *1/*1 carriers than that in *18B/*18B carriers in all the renal transplant recipients (p < 0.05), respectively. Genotype of ABCC8 T-3C was associated with fasting serum glucose in both NODAT and non-NODAT patients (p < 0.05). Furthermore, family history of DM (OR = 3.734, p = 0.002), concentration/dose above 70 ([ng/mL]/[mg/kg]) (OR = 2.154, p = 0.034) and GCK G-30A (OR = 2.272, p = 0.026) were independently correlated with the incidence of NODAT in logistic regression.Conclusions: The polymorphisms of CYP3A4 *18B and GCK G-30A were related to NODAT induced by tacrolimus. [ABSTRACT FROM AUTHOR]