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Paternal uniparental disomy of chromosome 11 (upd(11)pat) accounts for up to 20% of molecularly confirmed Beckwith-Wiedemann spectrum (BWSp) cases. It belongs to the BWSp subgroup with the second highest tumor risk, and therefore needs particular awareness in research, diagnostics and clinical management. We overview the contribution of paternal (mosaic) uniparental disomy of chromosome 11 (UPD, upd(11)pat) and mosaic paternal uniparental diploidy in patients with Beckwith-Wiedemann features. The review comprises the current knowledge on their formation and their molecular and clinical consequences. Accordingly, the consequences for diagnostic testing and clinical monitoring are compiled. The necessity to diagnostically identify and thus discriminate genome-wide paternal uniparental disomy, and upd(11)pat becomes obvious, due to the differences in the clinical course, disease prognosis, and treatment. In particular, monitoring of tumor development by liquid biopsy might be a promising option in the future. From the research point of view, it should be addressed why 11p is prone to mitotic recombination and thus also provide to the role of upd(11) as second hit in tumorigenesis.

Further understanding of paternal uniparental disomy in Beckwith-Wiedemann syndrome