Determinants of intestinal permeability in healthy first-degree relatives of individuals with Crohn's disease.
The Genetics, Environmental, Microbial Project is a multicenter study assessing etiological factors in Crohn's disease by studying healthy first-degree relatives (FDRs) of individuals affected by Crohn's disease. We aimed to evaluate the contribution of genetic, microbial, and environmental factors to the determination of intestinal permeability in healthy FDRs.



IP was assessed using the lactulose-mannitol ratio (LacMan ratio). FDRs were genotyped for 167 inflammatory bowel disease-associated single nucleotide polymorphisms. Taxonomic profile of the fecal microbiota was determined by Illumina MiSeq pyrosequencing of 16S ribosomal RNA. The associations of LacMan ratio with demographic factors, inflammatory bowel disease-associated single nucleotide polymorphisms and the fecal microbiota were assessed.



One thousand, one hundred ninety-six white FDRs were included [corrected]. Eleven percent of FDRs had an elevated LacMan ratio (≥0.03). A multivariate analysis demonstrated that younger subjects and nonsmokers had higher LacMan ratios, P = 3.62 × 10⁻⁴ and P = 0.03, respectively. The LacMan ratio was not significantly heritable, H2r, 0.13, P = 0.13. There was no association between any of the 167 inflammatory bowel disease-associated risk variants and LacMan ratio nor was there a correlation between fecal microbial composition and the LacMan ratio.



We did not find LacMan ratio to be significantly heritable suggesting that the contribution of genetic factors to the determination of intestinal permeability in healthy FDRs is modest. Environmental factors, such as smoking, are likely more important determinants. The effect of age on intestinal barrier function has been underappreciated.
*Zane Cohen Centre for Digestive Diseases, Mount Sinai Hospital, Toronto, ON, Canada; †Division of Gastroenterology, Department of Medicine, University of Toronto, Toronto, ON, Canada; ‡Division of Gastroenterology, Department of Medicine, University of Alberta, Edmonton, AB, Canada; §Division of Gastroenterology, Department of Medicine, University of Calgary, Calgary, AB, Canada; ‖Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada; ¶Department of Biology, University of Waterloo, Waterloo, ON, Canada; **Division of Gastroenterology, Hepatology and Nutrition, Department of Paediatrics, The Hospital for Sick Children, Toronto, ON, Canada; and ††The Hospital for Sick Children Research Institute, The Hospital for Sick Children, Toronto, ON, Canada.
David
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Kevans
Williams
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Turpin
Karen
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Madsen
Jon
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Meddings
Konstantin
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Shestopaloff
Wei
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Xu
Gabriel
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Moreno-Hagelsieb
Anne
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Griffiths
Mark S
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Silverberg
Andrew
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Paterson
Kenneth
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Croitoru
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D003424:Crohn Disease / Q000235:genetics / Q000382:microbiology / Q000503:physiopathology*; D005190:Family; D005243:Feces / Q000382:microbiology; D005260:Female; D059647:Gene-Environment Interaction; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism*; D007422:Intestines / Q000382:microbiology; D007792:Lactulose / Q000032:analysis; D008297:Male; D008353:Mannitol / Q000032:analysis; D064307:Microbiota; D010539:Permeability; D020641:Polymorphism, Single Nucleotide; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012737:Sex Factors; D012907:Smoking / Q000009:adverse effects; D055815:Young Adult
D012336:RNA, Ribosomal, 16S; D008353:Mannitol; D007792:Lactulose