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Dysbiosis of the faecal microbiota in patients with Crohn's disease and their unaffected relatives

瘤胃球菌 失调 普氏粪杆菌 肠道菌群 双歧杆菌 生物 微生物学 维管菌 医学 乳酸菌 免疫学 内科学 细菌 遗传学 链球菌
作者
Marie Joossens,Geert Huys,Margo Cnockaert,Vicky De Preter,Kristin Verbeke,Paul Rutgeerts,Peter Vandamme,Séverine Vermeire
出处
期刊:Gut [BMJ]
卷期号:60 (5): 631-637 被引量:886
标识
DOI:10.1136/gut.2010.223263
摘要

Background and aims

A general dysbiosis of the intestinal microbiota has been established in patients with Crohn9s disease (CD), but a systematic characterisation of this dysbiosis is lacking. Therefore the composition of the predominant faecal microbiota of patients with CD was studied in comparison with the predominant composition in unaffected controls. Whether dysbiosis is present in relatives of patients CD was also examined.

Methods

Focusing on families with at least three members affected with CD, faecal samples of 68 patients with CD, 84 of their unaffected relatives and 55 matched controls were subjected to community fingerprinting of the predominant microbiota using denaturing gradient gel electrophoresis (DGGE). To analyse the DGGE profiles, BioNumerics software and non-parametric statistical analyses (SPSS V.17.0) were used. Observed differences in the predominant microbiota were subsequently confirmed and quantified with real-time PCR.

Results

Five bacterial species characterised dysbiosis in CD, namely a decrease in Dialister invisus (p=0.04), an uncharacterised species of Clostridium cluster XIVa (p=0.03), Faecalibacterium prausnitzii (p<1.3×10−5) and Bifidobacterium adolescentis (p=5.4×10−6), and an increase in Ruminococcus gnavus (p=2.1×10−7). Unaffected relatives of patients with CD had less Collinsella aerofaciens (p=0.004) and a member of the Escherichia coli–Shigella group (p=0.01) and more Ruminococcus torques (p=0.02) in their predominant microbiota as compared with healthy subjects.

Conclusion

Unaffected relatives of patients with CD have a different composition of their microbiota compared with healthy controls. This dysbiosis is not characterised by lack of butyrate producing-bacteria as observed in CD but suggests a role for microorganisms with mucin degradation capacity.
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