Daidzein Intake Is Associated with Equol Producing Status through an Increase in the Intestinal Bacteria Responsible for Equol Production

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Reviewed Marked as Reviewed by Atrayees on 2023-6-28
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DOI Digital object identifier for electronic documents.
Iino C, Shimoyama T, Iino K, Yokoyama Y, Chinda D, Sakuraba H, Fukuda S, Nakaji S
Asaccharobacter celatus, Slackia isoflavoniconvertens, daidzein, equol, gut microbiota
Equol is a metabolite of isoflavone daidzein and has an affinity to estrogen receptors. Although equol is produced by intestinal bacteria, the association between the status of equol production and the gut microbiota has not been fully investigated. The aim of this study was to compare the intestinal bacteria responsible for equol production in gut microbiota between equol producer and non-producer subjects regarding the intake of daidzein. A total of 1044 adult subjects who participated in a health survey in Hirosaki city were examined. The concentration of equol in urine was measured by high-performance liquid chromatography. The relative abundances of 8 bacterial species responsible for equol production in the gut microbiota was assessed using 16S rRNA amplification. There were 458 subjects identified as equol producers. The proportion of equol production status and the intake of daidzein increased with age. Daily intake of daidzein was larger in equol-producer. The intestinal bacteria, which convert daidzein to equol were present in both equol producers and non-producers. However, the relative abundance and the prevalence of Asaccharobactercelatus and Slackiaisoflavoniconvertens were significantly higher in equol producers than those in equol non-producers. The intestinal bacteria that convert daidzein to equol are present in not only the equol producers but also in the non-producers. The daidzein intake is associated with the equol production status through an increase of A.celatus and S.isoflavoniconvertens in the gut microbiota.

Experiment 1

Reviewed Marked as Reviewed by Atrayees on 2023-6-28

Curated date: 2021/01/10

Curator: WikiWorks

Revision editor(s): WikiWorks


Location of subjects
Host species Species from which microbiome was sampled. Contact us to have more species added.
Homo sapiens
Body site Anatomical site where microbial samples were extracted from according to the Uber Anatomy Ontology
Feces Cow dung,Cow pat,Droppings,Dung,Excrement,Excreta,Faeces,Fecal material,Fecal matter,Fewmet,Frass,Guano,Matières fécales@fr,Merde@fr,Ordure,Partie de la merde@fr,Piece of shit,Porción de mierda@es,Portion of dung,Portion of excrement,Portion of faeces,Portion of fecal material,Portion of fecal matter,Portion of feces,Portion of guano,Portion of scat,Portionem cacas,Scat,Spoor,Spraint,Stool,Teil der fäkalien@de,Feces,feces
Condition The experimental condition / phenotype studied according to the Experimental Factor Ontology
Equol (3S)-3-(4-hydroxyphenyl)-3,4-dihydro-2H-1-benzopyran-7-ol,Equol,equol
Group 0 name Corresponds to the control (unexposed) group for case-control studies
equol non-producers
Group 1 name Corresponds to the case (exposed) group for case-control studies
equol producers
Group 1 definition Diagnostic criteria applied to define the specific condition / phenotype represented in the case (exposed) group
The equol production status was defined by a urinary log 10 - transformed equol/daidzein ratio of −1.75 or more as described previously
Group 0 sample size Number of subjects in the control (unexposed) group
Group 1 sample size Number of subjects in the case (exposed) group

Lab analysis

Sequencing type
16S variable region One or more hypervariable region(s) of the bacterial 16S gene
Sequencing platform Manufacturer and experimental platform used for quantifying microbial abundance

Statistical Analysis

Statistical test
Mann-Whitney (Wilcoxon)
Significance threshold p-value or FDR threshold used for differential abundance testing (if any)
MHT correction Have statistical tests be corrected for multiple hypothesis testing (MHT)?

Alpha Diversity

Shannon Estimator of species richness and species evenness: more weight on species richness
Chao1 Abundance-based estimator of species richness

Signature 1

Reviewed Marked as Reviewed by Atrayees on 2023-6-28

Curated date: 2021/01/10

Curator: Shaimaa Elsafoury

Revision editor(s): WikiWorks

Source: Table 2

Description: Relative abundance of species (percentage of the total bacterial 16sRNA).

Abundance in Group 1: increased abundance in equol producers

NCBI Quality ControlLinks
Adlercreutzia equolifaciens subsp. celatus
Slackia isoflavoniconvertens

Revision editor(s): WikiWorks