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Inflammatory bowel disease and the X chromosome
P A Hayward1, J Satsangi, D P Jewell
1Nuffield Department of Clinical Medicine, John Radcliffe Hospital, Oxford, UK.
QJM : Monthly Journal of the Association of Physicians
|September 1, 1996
Summary
Turner's syndrome is linked to inflammatory bowel diseases like Crohn's disease and ulcerative colitis, especially with specific X chromosome abnormalities. This genetic link suggests X chromosome genes may play a role in inflammatory bowel disease development.
Area of Science:
- Genetics
- Gastroenterology
- Endocrinology
Background:
- Turner's syndrome is a genetic condition typically associated with a missing or partially missing X chromosome.
- Inflammatory bowel diseases (IBD), including Crohn's disease and ulcerative colitis, are chronic conditions affecting the digestive tract.
- A potential association between Turner's syndrome and IBD has been suggested but requires further investigation.
Purpose of the Study:
- To review documented cases to determine the association between Turner's syndrome and inflammatory bowel diseases.
- To identify specific genetic factors within Turner's syndrome that may contribute to IBD susceptibility.
- To explore the pathogenetic mechanisms underlying the observed association.
Main Methods:
- Literature review of documented cases linking Turner's syndrome and IBD.
- Analysis of genetic constitutions (karyotypes) in patients with both conditions.
- Correlation of specific karyotypes with the presence and type of IBD.
- Ongoing linkage analysis studies using X chromosome microsatellite markers.
Main Results:
- A significant association exists between Turner's syndrome and Crohn's disease/ulcerative colitis.
- The karyotype 46XiXq (in pure or mosaic form) is a notable susceptibility factor for IBD.
- Phenotypic characteristics of Turner's syndrome may be subtle and overlooked in IBD patients with this karyotype.
- The X chromosome likely harbors genes crucial for IBD pathogenesis.
Conclusions:
- The X chromosome plays a significant role in the pathogenesis of inflammatory bowel diseases.
- Specific X chromosome abnormalities, particularly the 46XiXq karyotype, increase susceptibility to IBD.
- Further genetic studies, including linkage analysis, are essential to elucidate the precise mechanisms involved.