Zusammenfassung
Modernste Technologien der genetischen Forschung bieten der Medizin einen ganz neuen Zugangsweg zur Entdeckung von genetischen Krankheitsursachen. Innerhalb der letzten 15 Jahre wurden die genetischen Untersuchungstechniken in einem solchen Umfang weiterentwickelt, dass heute auch die Untersuchung „komplexer“ Erkrankungen und die Entschlüsselung kompletter Patientengenome innerhalb kürzester Zeit möglich sind.
Für die chronisch-entzündlichen Darmerkrankungen (CED) Morbus Crohn und Colitis ulcerosa sind mittlerweile über 200 assoziierte Genloci bekannt. Die Mehrheit der identifizierten Loci überschneidet sich nicht nur zwischen Morbus Crohn und Colitis ulcerosa, was deren klinische Ähnlichkeit widerspiegelt, sondern auch mit anderen chronisch-entzündlichen Erkrankungen, vor allem mit Psoriasis, Morbus Bechterew und primären Immundefizienzen. Die beiden wichtigsten und am besten validierten CED-Krankheitsloci sind nach wie vor NOD2 (für Morbus Crohn) und die HLA-Region (für Colitis ulcerosa). Genetische Analysen in anderen Ethnizitäten (z. B. Asiaten) zeigen nahezu die gleichen assoziierten Risikoloci wie in europäischstämmigen Patienten. Interessanterweise ist NOD2 hier eine Ausnahme.
Die jüngsten großen genetischen Studien bestätigen die Assoziation von Risikovarianten in NOD2 mit Dünndarmbefall bei Morbus Crohn und suggerieren die Existenz von eher drei als zwei Subformen der CED: 1) Colitis ulcerosa, 2) Morbus Crohn mit Dickdarmbefall, 3) Morbus Crohn mit Dünndarmbefall.
Durch hochmoderne Sequenzieranalysen konnten in den letzten Jahren für frühkindliche Formen der CED einzelne Mutationen vor allem in bekannten Immundefizienzgenen (neben den bekannten Mutationen in IL10RA/B), identifiziert und die Erkrankungen damit aufgeklärt werden (monogener Defekt).
Abstract
Modern technologies in genetic research hold the promise of identifying yet unknown causes of diseases, revealing the relevant pathways, and prioritizing therapeutic targets. Technological developments of the last 15 years tremendously contributed to novel genetic findings in complex disease research. Entire patient genomes can now be deciphered within a few days at reasonable and continuously decreasing costs.
More than 200 genetic susceptibility loci have been identified for the inflammatory bowel (IBD) diseases, Crohn’s disease (CD), and ulcerative colitis (UC). Reflecting their clinical similarity, most of the risk loci are shared between CD and UC outside the major histocompatibility complex (MHC). The genetic risk map of IBD is also highly similar to other chronic immune-mediated diseases, especially psoriasis, ankylosing spondylitis, and primary immunedeficiencies. The two best validated IBD disease loci are still NOD2 for CD and the HLA/MHC region on chromosome 6p21 for UC. Genetic investigations in non-European-ancestry cohorts (e. g., from Eastern Asia) also suggest that risk loci are shared across different ancestries. Interestingly, this is not true for NOD2.
A recent large-scale and multicenter study validated the association of susceptibility variants within the NOD2 gene and ileal CD. These genetic analyses also support the theory that rather three than two subtypes of IBD exist: (1) UC, (2) colonic CD, and (3) ileal CD.
Modern high-throughput sequencing studies revealed several monogenic forms of early onset and very early onset IBD, implicating often known immunodeficiency disease loci, including the previously implicated interleukin-10 receptor (IL10RA/B) gene. Thus, identifying a single causative genetic variant in these young patients proves their exact disease cause.
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Degenhardt, F., Franke, A. Genetik des Morbus Crohn und der Colitis ulcerosa. Wien klin Mag 21, 4–13 (2018). https://doi.org/10.1007/s00740-017-0211-0
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DOI: https://doi.org/10.1007/s00740-017-0211-0
Schlüsselwörter
- Morbus Crohn
- Colitis Ulcerosa
- Chronisch-entzündliche Darmerkrankungen
- Genomweite Assoziationsstudie
- Genetische Risikofaktoren
- Humanes Leukozytenantigen
- Genetische Pleiotropie