Gut Microbiota Composition Changes in Constipated Women of Reproductive AgeOriginal 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 cross-sectional study examined how the gut microbiota differs in chronic constipation, a common functional gastrointestinal disorder with unclear cause. It focused on one narrow group to limit confounders. Fecal microbial composition was compared between constipated and healthy women using 16S ribosomal RNA gene sequencing. Restricting to reproductive-age women aimed to reduce the effects of age, sex, and hormone levels on the microbiome, isolating the impact of constipation.
Who was studied?
Participants were 29 constipated women and 30 healthy control women of reproductive age, recruited mostly from staff of Shanxi Bethune Hospital in Taiyuan, China. This was a human cohort study. Constipated women met Rome IV criteria; controls had no constipation symptoms. All had a normal body mass index between 18 and 25. Women were excluded if they had recently taken laxatives, antibiotics, probiotics, or related medications. Groups did not differ in age or metabolic blood markers.
What were the most important findings?
Alpha diversity was similar between groups, with no significant difference in Shannon or Chao1 indices (both p greater than 0.05), but beta diversity differed significantly (p < 0.01). Composition shifted at multiple taxonomic levels. Constipated women had higher Bacteroidetes (p < 0.05) and lower Proteobacteria (p < 0.01), lowering the Firmicutes-to-Bacteroidetes ratio to 1.52 versus 2.21 in controls. Bacteroidaceae rose while Enterobacteriaceae fell (p < 0.01). Butyrate-producing bacteria of the Lachnospiraceae family were also reduced.
What are the greatest implications of this study?
The findings suggest chronic constipation in reproductive-age women is associated with a distinct gut microbiota, marked by more Bacteroidetes, less Proteobacteria, and fewer butyrate producers. Reduced butyrate could relate to slower colonic transit. These taxa or their metabolites may become targets for understanding constipation and developing microbiota-based therapies. The sample was small and limited to one region and sex, without metagenomic or metabolomic confirmation, so associations need validation and do not prove causation.