Keywords :
Alleles; Base Sequence; Chromosomes, Human, Pair 14; Female; Genes, Immunoglobulin Heavy Chain; Humans; Intercellular Signaling Peptides and Proteins/analysis/genetics/metabolism; Leukemia, B-Cell/genetics/immunology/metabolism; Lymphoma, B-Cell/chemistry/genetics/immunology/metabolism; Male; Membrane Proteins/analysis/genetics/metabolism; Methylation; Parents; Proteins/analysis/genetics/metabolism
Abstract :
[en] Leukemias/lymphomas with IGH-involving del(14q)(1) commonly lose the DLK1-GTL2 imprinted domain that comprises several paternally and maternally expressed genes, including a cluster of microRNAs. Given that deletion of this region could lead to inactivation of a monoallelically expressed tumor suppressor gene, our study aimed at determination of the parental origin of del(14q/IGH). The designed allele-specific methylation study of the DLK1/GTL2 intergenic differentially methylated region allowed us to determine the parental origin of del(14q/IGH) in 9/20 analyzed cases. In six cases del(14q/IGH) was of the paternal origin and in three cases of the maternal origin. These findings argue against the concept that a TSG/anti-oncomir located in the imprinted region is systematically inactivated by a targeted deletion of its functional allele.
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