Zusammenfassung
Der M. Hirschsprung ist eine Neurocristopathie infolge fehlender oder malfunktionaler intramuraler intestinaler Ganglienzellen. Der aganglionäre Anteil ist nach rostral sehr variabel. Der M. Hirschsprung kann in Typ 1 (kurzes Segment) und Typ 2 (langes Segment) eingeteilt werden. Er tritt isoliert auf den Gastrointestinaltrakt beschränkt oder bei 12% der Patienten syndromal als Begleiterscheinung zahlreicher anderer, genetisch bedingter Krankheiten auf. Die Populationshäufigkeit beträgt 1/5000 mit 4- bis 5-fach höherer Beteiligung des männlichen Geschlechts. Zahlreiche Gene und nichtcodierende polymorphe DNA-Sequenzvarianten spielen eine ätiologische Rolle. Das wichtigste identifizierte Gen ist das RET-Gen. Suszeptibilitätsloci auf 3p21, 9q31 und 19q12 interagieren mit dem RET-Locus. Mit GALNACT-2 und RASGEF1A sind 2 neue Gene „downstream“ (in 3’-Richtung) von RET identifiziert worden. Eine vor kurzem beschriebene, häufige, nichtkodierende RET-Variante RET+3 ist signifikant mit einer Suszeptibilität für M. Hirschsprung assoziiert und trägt im Vergleich zu selteneren Allelen ein 20-fach erhöhtes Hirschsprung-Risiko.
Abstract
Hirschsprung’s disease constitutes a neural crest stem cell disorder (neurocristopathy) which is caused by absent or malfunctional intestinal intramural ganglion cells. The rostral extension of the aganglionic segment is variable. Hirschsprung’s disease can be classified into type 1 (short segment) and type 2 (long segment) forms. It is limited to the gastrointestinal tract, but may occur in the syndromal context of manifold genetic diseases in 12% of patients. The prevalence is 1:5,000 with a distinct male predominance of 4–5:1. Numerous genes and non-coding polymorphous DNA sequence variants are involved in the pathogenesis of Hirschsprung’s disease. The most important gene is RET. Susceptibility loci on 3p21, 9q31 and 19q12 interact with this gene. Downstream of RET, two new genes, GALNACT-2 and RASGEF1A, have also been identified. A recently described, frequent, non-coding RET variant, RET+3, is significantly associated with susceptibility to Hirschsprung’s disease and carries a 20-fold increased risk of contracting the disease compared to rarer alleles.
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Passarge, E., Bruder, E. Genetische Grundlagen des Morbus Hirschsprung. Pathologe 28, 113–118 (2007). https://doi.org/10.1007/s00292-007-0899-5
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DOI: https://doi.org/10.1007/s00292-007-0899-5