Abstract
Aims
Recent studies have suggested a possible association between microbiota and gestational diabetes (GDM). However, the results are inconsistent. Our objective was to investigate further the relationship between GDM and microbiota and verify the potential microbial marker.
Methods
Two complementary approaches were used for the demonstration. First, we compared the gut microbial composition of 23 GDM patients and 26 non-GDM ethnically Chinese Han pregnant women, by using whole-metagenome shotgun sequencing of their stool samples collected at the third trimester. Second, we used Q-PCR (quantitative polymerase chain reaction) to evaluate the gut microbial composition in the stool samples from another cohort of 150 Chinese pregnant women (113 Control and 37 GDM), to further confirm the potential microbial marker.
Results
The gut microbiota of GDM women show lower albeit not statistically significant (p = 0.18) alpha diversity at the species level than non-GDM women. However, the species-level beta-diversity or between-sample diversity measured by Bray–Curtis distance shows significant differences (p < 2.2e−16) between the two groups. The species Bacteroides dorei positively correlated with both OGTT (oral glucose tolerance test) 0-Hour (p = 0.0099) and OGTT 1-Hour (p = 0.0070). There is a similar trend between Bacteroides sp. 3_1_33FAA and both OGTT 0-Hour (p = 0.014) and OGTT 1-Hour (p = 0.0101) response variables. The species Alistipes putredinis negatively correlated with OGTT 1-Hour (p = 0.0172) and OGTT 2-Hour (p = 0.0147). Q-PCR validation further confirmed the association between the glucose tolerance loci of Bacteroides dorei and OGTT response.
Conclusions
Gut microbiome is related to the diabetic status of Chinese women during pregnancy. Specific species such as Bacteroides dorei associate with glucose response and could be potential monitoring and therapeutic microbial markers for GDM.
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Availability of data and material
All sequencing data underlying this work’s contributions will be made freely available.
Abbreviations
- GDM:
-
Gestational diabetes mellitus
- GTT:
-
Oral glucose tolerance test
- RNA:
-
Ribonucleic acid
- Q-PCR:
-
Quantitative polymerase chain reaction
- ADA:
-
American Diabetes Association
- DNA:
-
Deoxyribonucleic acid
- USA:
-
United States of America
- LefSe:
-
Linear discriminant analysis effect size tool
- PERMANOVA:
-
Permutational multivariate analysis of variance
- CPM:
-
Counts-per-million
- IGV:
-
Integrative Genomics Viewer
- BWA:
-
Burrows–Wheeler Aligner
- ACTB:
-
Human beta-actin
- PCoA:
-
Principal coordinate analysis
- LDA:
-
Linear discriminant analysis
- rRNA:
-
Ribosomal ribonucleic acid
- EMP:
-
Embden–Meyerhof–Parnas pathway
- PPP:
-
Pentose phosphate pathway
- acetyl CoA:
-
Acetyl coenzyme A
- OGTT-1-Pos:
-
Loci positively associated with OGTT 1-Hour response
- SCFA:
-
Short-chain fatty acids
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Acknowledgements
The study was supported by computational resources of the Zhongshan Ophthalmic Center and the Tianhe-2 supercomputer and the Extreme Science and Engineering Discovery Environment (XSEDE), which is supported by National Science Foundation grant number ACI-1548562. The XSEDE resources of the Pittsburgh Supercomputing Center’s Bridges system under the allocation TG-MCB190095 supported the computational analysis of P. W. Bible. The authors would like to thank Dr. Andrew Sand of Butler University for providing essential computational assistance.
Funding
The study was supported by Natural Science of Guangdong Province, China (2015A030313198), Youth Cultivation Project of Sun Yat-sen University, China (17ykpy24), Clinical Medical Project 5010 of Sun Yat-sen University, China (2012004), and the National Natural Science Foundation of China (81771606, 81571452).
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YW collected and processed the clinical samples and analyzed and interpreted the data and wrote the manuscript. PWB wrote the manuscript and processed, analyzed, and interpreted the data. SL, WM, WD, and YL collected and processed the clinical samples. XW processed the clinical samples and performed the experiments. XL and XD processed the clinical samples. YD performed the experiments. SG carried out metagenomic sequencing experiments. CLD contributed to pathway analysis and discussion and wrote the manuscript. LW designed the study and supervised the data analysis and interpretation. HC designed the study and supervised the clinical sample collection and data interpretation. ZW designed the study and supervised the clinical sample collection and data interpretation.
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This study was approved by the research ethics committee of the First Affiliated Hospital, Sun Yat-sen University (Protocol: No. 187, 2016), and was conducted in accordance with the principles of the Declaration of Helsinki.
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Figure S1
Neighbor joining tree of Bacteroides 16S RNA genes. The 16S RNA genes of common Bacteroides species are analyzed by sequence similarity. Values indicate neighbor-joining branch length. Smaller values indicate smaller divergence from neighboring branches. (PNG 74 kb)
Table S1
Functional Metagenomic Pathways showing differential abundance between GDM and healthy mothers. Pathways discovered using HUMANN2 software were statistically assessed for differential abundance. Mean normalized counts per million are reported for each cohort. P values are based on a Mann–Whitney–Wilcoxon test. (XLSX 9 kb)
Table S2
Associations between species abundance and clinical variables. Associations between clinical variables and species abundances across all patients were assessed using Spearman’s nonparametric correlation tests. All significant associations at p < 0.05 are reported. (XLSX 51 kb)
Table S3
Complete list of specifically enriched EC pathways from the GDM (DM) catalog. This catalog lists the p value and pathway information for all specially enriched EC functions associated with the GDM catalog. (CSV 180 kb)
Table S4
Complete list of specifically enriched EC pathways from the non-GDM (PG) catalog. This catalog lists the p value and pathway information for all specially enriched EC functions associated with the non-GDM catalog. (CSV 98 kb)
Table S5
Complete list of specifically enriched KEGG pathways from the GDM (DM) catalog. This catalog lists the p value and pathway information for all specially enriched KEGG ortholog functions associated with the GDM catalog. (CSV 87 kb)
Table S6
Complete list of specifically enriched KEGG pathways from the non-GDM (DM) catalog. This catalog lists the p value and pathway information for all specially enriched KEGG functions associated with the non-GDM catalog. (CSV 88 kb)
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Wu, Y., Bible, P.W., Long, S. et al. Metagenomic analysis reveals gestational diabetes mellitus-related microbial regulators of glucose tolerance. Acta Diabetol 57, 569–581 (2020). https://doi.org/10.1007/s00592-019-01434-2
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DOI: https://doi.org/10.1007/s00592-019-01434-2