Characteristics of fecal microbiota in different constipation subtypes and association with colon physiology, lifestyle factors, and psychological statusOriginal 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?
This study examined the fecal microbiota of patients with chronic constipation (CC) to see how bacterial composition differs across constipation subtypes. Researchers compared slow-transit constipation versus normal-transit constipation, and separately compared dyssynergic defecation versus non-dyssynergic defecation. They also tested whether colorectal physiology (such as rectal defecation pressure), lifestyle factors, and psychological distress were associated with microbiota composition.
Who was studied?
The study enrolled 53 individuals with chronic constipation and 31 healthy individuals in a prospective cohort design. Stool samples from all participants were analyzed using 16S rRNA sequencing. Within the CC group, 31 patients were classified with slow-transit constipation and 22 with normal-transit constipation, and separately 28 patients had dyssynergic defecation and 25 did not.
What were the most important findings?
Bacteroidaceae was lower, while Peptostreptococcaceae, Christensenellaceae, and Clostridiaceae were higher, in slow-transit constipation compared to normal-transit constipation. Bacteroidaceae and Ruminococcaceae were higher in patients with dyssynergic defecation than in those without it. Rectal defecation pressure was negatively correlated with Prevotellaceae and Ruminococcaceae abundance but positively correlated with Bifidobacteriaceae abundance. Depression was a positive predictor of Lachnospiraceae abundance, and poorer sleep quality independently predicted decreased Prevotellaceae abundance.
What are the greatest implications of this study?
The findings show that chronic constipation is not a single microbial entity: different constipation subtypes carry distinct patterns of dysbiosis. This helps explain why prior microbiome studies of constipation have produced inconsistent results, since many did not stratify by subtype. The results also suggest that psychological status and sleep quality should be considered alongside colon physiology when interpreting or targeting the gut microbiota in constipation research.