Novel familial distal imprinting centre 1 (11p15.5) deletion provides further insights in imprinting regulation.


Institute of Human Genetics, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, D-52074, Aachen, Germany. [Email]


Deletions of the imprinting centre 1 (IC1) in 11p15.5 are rare and their clinical significance is not only influenced by their parental origin but also by their exact genomic localization. In case the maternal IC1 allele is affected, the deletion is associated with the overgrowth disorder Beckwith-Wiedemann syndrome (BWS) and a gain of methylation (GOM) of the IC1. The consequences of deletions of the paternal IC1 allele depend on the localization and probably the binding sites of methylation-specific DNA-binding factors affected by the change. It has been suggested that distal deletions of the paternal allele are associated with a normal IC1 methylation and phenotype, whereas proximal alterations cause a loss of methylation (LOM) and Silver-Russell syndrome (SRS) features.


Beckwith-Wiedemann syndrome,Deletion,H19/IGF2:IG-DMR,Imprinting centre 1,Nanopore sequencing,Silver-Russell syndrome,

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