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Brustkrebs: BRCA-Mutationen und strahleninduzierte DNA-Schäden

(PresseBox) (Düsseldorf, )
Brustkrebs ist die häufigste Krebserkrankung bei Frauen. Eine erbliche Prädisposition für Brustkrebs wird in 5 - 10 Prozent der Fälle mit einer Mutation der brustkrebsassoziierten Gene BRCA1 und BRCA2 in Verbindung gebracht. Dies wird auf die Rolle der Genprodukte bei der Erhaltung der genomischen Stabilität und der Reparatur von DNA-Doppelstrangbrüchen (DSBs) zurückgeführt.

Diese schwerwiegenden DNA-Schäden entstehen unter anderem durch Röntgenstrahlung. Konsequenterweise würde eine Beeinträchtigung der Funktionen von BRCA1 und BRCA2 der gängigen medizinischen Praxis, erblich vorbelastete Frauen in relativ jungen Jahren und regelmäßig mammografisch zu untersuchen, widersprechen.

Durch die Bestrahlung könnten vermehrt DNA-DSBs entstehen, die aufgrund der eingeschränkten
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