Characteristics of the intestinal flora in patients with peripheral neuropathy associated with type 2 diabetesOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
Researchers compared gut microbiota in 80 people with type 2 diabetes: 45 with diabetic peripheral neuropathy (DPN), 21 with diabetes but no DPN, and 14 healthy controls. They tested whether flora composition tracked with clinical markers like insulin resistance and bile acid levels.
How was it studied?
Fecal microbiota composition was profiled and compared across the three groups at the phylum and genus level. Correlations between bacterial taxa and clinical indicators, including the HOMA insulin resistance index and specific bile acids, were then analyzed.
What did they find?
In the DPN group, Firmicutes and Actinobacteria were more abundant while Bacteroidetes was reduced at the phylum level. At the genus level, Bacteroides and Faecalibacterium were depleted, while Escherichia-Shigella, Lachnoclostridium, Blautia, Megasphaera, and Ruminococcus torques group were enriched. Insulin resistance (HOMA-IR) correlated positively with Megasphaera, and glycine and tauroursodeoxycholic acids correlated positively with Ruminococcus gnavus group and related genera.
Why it matters
The findings point to a distinct gut microbiota disorder in diabetic peripheral neuropathy, linked to insulin resistance and bile acid metabolism. This suggests intestinal flora imbalance may contribute mechanistically to DPN development in type 2 diabetes.